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JP2009159083

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DESCRIPTION JP2009159083
To provide an auditory characteristic simulation device, a mixing balance display system, and a
program thereof that have the effect of being able to accurately simulate the auditory
characteristics of a sensorinergic deaf person without giving discomfort to a hearing person. .
SOLUTION: An elderly person hearing simulation apparatus 100 calculates time-frequency
conversion units 13 and 14 for converting a time-domain signal into a frequency-domain signal,
and calculates an energy level for calculating an energy level of the frequency-domain signal for
each frequency band. Sections 15 and 16, masking correction amount calculating section 17 for
calculating masking correction amount, recruitment simulation section 18 for simulating an
aging recruitment phenomenon, frequency characteristic correction section 19 for correcting
frequency characteristics, frequency domain correction The frequency-time conversion units 20
and 21 convert signals into time-domain signals. [Selected figure] Figure 1
Auditory characteristic simulation device, mixing balance display system and their programs
[0001]
The present invention relates to, for example, an auditory characteristic simulation apparatus
that simulates the auditory characteristics of elderly people, a mixing balance display system
including the same, and programs thereof.
[0002]
Conventionally, for example, narration (hereinafter referred to as "NR").
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) Signal and background music (hereinafter referred to as "BGM"). ) When mixing with the signal,
the trained voice adjuster operates the voice adjustment console while actually listening to the
sound, and manually adjusts the mixing balance between the NR signal and the BGM signal to be
optimal . In this method, there is a problem that a skilled voice adjuster is required, and a voice
level balance instruction device has been proposed for the purpose of solving the problem (for
example, see Patent Document 1).
[0003]
The method disclosed in Patent Document 1 includes a means for obtaining an auditory masking
curve based on an auditory model for NR and BGM, a means for obtaining a level difference
between an auditory masking curve for NR and an auditory masking curve for BGM, Means for
generating a control signal for controlling the mixing balance from the level difference between
the two, and it is possible to indicate the state of the mixing balance between the NR signal and
the BGM signal. Japanese Patent Application Laid-Open No. 10-308999
[0004]
However, although the conventional one shown in Patent Document 1 can solve the problem that
a skilled voice adjuster is required, the BGM signal is greater than the NR signal at the rising and
falling parts of the NR signal. Since an inappropriate indication that the size is too large often
occurs, the indication value of the state of the mixing balance and the audibility are difficult to
match, and its improvement has been desired. In particular, a conventional one is a person whose
hearing ability has been reduced due to a sensorineural deafness such as, for example, an aged
deafness (hereinafter referred to as a “sensory deaf person). It was not possible to display a
mixing balance that fits well with the sense of
[0005]
また、B.C.J. According to the report of Moore et al., It is shown that it is possible to
simulate the auditory characteristics of a sensorineural deaf person by adding a noise signal
component to a speech signal component, but noise is present for a hearing person with normal
hearing. There is a problem that the signal component is disturbed psychologically to cause
discomfort to the hearing person.
08-05-2019
2
[0006]
The present invention has been made in view of such circumstances, and is an auditory
characteristic simulation device that can accurately simulate the auditory characteristics of a
sensorineural deaf person without giving discomfort to a hearing person, It is an object of the
present invention to provide a provided mixing balance display system and a program thereof.
[0007]
The auditory characteristic simulation apparatus according to the present invention comprises
energy level calculating means for calculating energy levels of first and second sound signals for
each frequency band, energy level of the first sound signal and the second sound signal. Masking
correction amount calculation means for calculating for each frequency band a masking
correction amount for simulating the auditory masking characteristic of a person with a
sensorineural hearing loss based on the difference with the energy level; energy level of the first
sound signal; Recruitment correction amount calculation means for calculating, for each of the
frequency bands, a recruitment correction amount for simulating the recruitment phenomenon of
the sound-sensing deaf person based on the sum of the second sound signal and the energy level
of the second sound signal; The noise-sensitive deaf person corresponding to the first and second
sound signals based on the masking correction amount and the recruitment correction amount It
has a configuration in which a hearing characteristic simulating signal calculation means for
calculating a first and a second hearing characteristics simulation signal simulating the sensation
characteristics.
[0008]
According to this configuration, the auditory characteristic simulation apparatus of the present
invention differs from the conventional one in that the first and second sound signals are
provided based on the masking correction amount and the recruitment correction amount
without giving a noise signal component to a hearing person. Since it is possible to simulate the
auditory characteristics of a sensorineural deaf person corresponding to each of them, it is
possible to accurately simulate the auditory characteristics of a sensorineural deaf person
without giving discomfort to a hearing person.
[0009]
Further, in the auditory characteristic simulation apparatus of the present invention, the masking
correction amount calculating means may be configured to set a difference between an energy
level of the first sound signal and an energy level of the second sound signal in advance. A signal
indicating a predetermined first masking correction amount is output when the threshold value is
08-05-2019
3
exceeded, and a signal indicating a predetermined second masking correction amount is output
when the threshold value is less than a predetermined second threshold value, A signal
representing a value obtained by a function that monotonously connects the first masking
correction amount and the second masking correction amount is output when the first threshold
value and the second threshold value are present. The first threshold is larger than the second
threshold, and the first masking correction amount is larger than the second masking correction
amount.
[0010]
With this configuration, the auditory characteristic simulation apparatus of the present invention
can accurately calculate, for each frequency band, a masking correction amount for simulating
the auditory masking characteristic of a person with a sense of sound sensitivity.
[0011]
Further, in the auditory characteristic simulation apparatus of the present invention, an energy
level added value indicating the sum of the energy level of the first sound signal and the energy
level of the second sound signal is the recruitment correction amount calculation means. Output
a signal indicating a predetermined amount of recruitment correction when the sound pressure
level is equal to or higher than the minimum sound pressure level threshold value that indicates
the minimum sound pressure level at which persons in the first and second predetermined age
groups sense loudness equally to each other Outputting a signal indicating a recruitment
correction amount obtained by a predetermined function when the sound pressure level is
smaller than the minimum sound pressure level threshold value, and the function is determined
by a person of the first and second age groups First and second minimum audible limits
respectively derived from minimum audible limit characteristics each indicating a relationship
between the lowest sound pressure and frequency that can be heard, and the energy level And
calculated value, which was determined on the basis of said minimum sound pressure level
threshold, the first minimum audible value has a smaller configuration than the second minimum
audible value.
[0012]
With this configuration, the auditory characteristic simulation apparatus according to the present
invention can accurately calculate a recruitment correction amount for simulating the
recruitment phenomenon of a sensorinergic deaf person for each of the frequency bands.
[0013]
Furthermore, in the auditory characteristic simulation apparatus of the present invention, the
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recruitment correction amount calculation means can change each of the first minimum audible
limit value, the second minimum audible limit value, and the minimum sound pressure level
threshold. It has a certain configuration.
[0014]
With this configuration, the auditory characteristic simulator of the present invention can more
accurately simulate the auditory characteristics of the person to be simulated.
[0015]
Furthermore, in the auditory characteristic simulation apparatus according to the present
invention, the auditory characteristic simulation signal calculation unit is configured to calculate
the first sound signal based on the energy level of the first sound signal, the masking correction
amount, and the recruitment correction amount. The auditory characteristic simulation signal is
calculated, and the second auditory characteristic simulation signal is calculated based on the
energy level of the second sound signal and the recruitment correction amount.
[0016]
According to this configuration, the auditory characteristic simulation apparatus of the present
invention can accurately simulate the auditory characteristics of a sensorinergic deaf person
without giving discomfort to a hearing person.
[0017]
Furthermore, the auditory characteristic simulation apparatus of the present invention has a
configuration provided with a simulated signal mixing means for mixing the first auditory
characteristic simulation signal and the second auditory characteristic simulation signal.
[0018]
According to this configuration, the auditory characteristic simulation apparatus of the present
invention can make the listener of the reproduction sound understand the auditory characteristic
of the sound-sensing deaf person by reproducing the simulated mixed sound signal output from
the simulated signal mixing unit. it can.
[0019]
A mixing balance display system according to the present invention comprises an auditory
characteristic simulation device, and a mixing balance display device for displaying a mixing
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balance state of the first auditory characteristic simulation signal and the second auditory
characteristic simulation signal. The mixing balance display device comprises level detecting
means for detecting the levels of the first and second auditory characteristic simulation signals
for each frame of a predetermined time interval, the first auditory characteristic simulation signal
and the second auditory characteristics Level difference calculation means for calculating a level
difference with a simulation signal, and weighted level difference calculation for calculating a
weighted level difference by weighting the level difference according to the level of the first
auditory characteristic simulation signal And calculating the average value of m values in order
from the largest value of the weighted level difference between the current frame and the past n
frames. Average auditory level difference calculating means, first auditory characteristic
simulated signal average value calculating means for calculating an average level value of the
first auditory characteristic simulation signal between the current frame and a predetermined
number of past frames, and the average A display value indicating a mixing balance state of the
first auditory characteristic simulation signal and the second auditory characteristic simulation
signal based on the calculation results of the level difference calculation unit and the first
auditory characteristic simulation signal average value calculation unit A display control signal
generation unit configured to generate a display control signal for controlling an output of the
display value determination unit based on a level of the first auditory characteristic simulation
signal to be determined; and a display control signal generation unit based on the display control
signal And a mixing balance display means for displaying the state of the mixing balance.
[0020]
With this configuration, the mixing balance display system of the present invention can urge the
audio mixer to lower the level of the simulated BGM signal when the level of the simulated BGM
signal is too large compared to the level of the simulated NR signal. Since it is possible to prevent
in advance the phenomenon that the NR is difficult to hear because the level is too large, it is
possible to support the improvement of the sound effect of the program.
[0021]
The auditory characteristic simulation program of the present invention is an auditory
characteristic simulation program for causing a computer to function as an auditory
characteristic simulation device that simulates the auditory characteristics of a person with
sensorineural hearing loss, and the computer comprises: Energy level calculation means for
calculating the energy level of the signal for each frequency band, and the hearing of the noisesensitive deaf person based on the difference between the energy level of the first sound signal
and the energy level of the second sound signal Masking correction amount calculating means
for calculating a masking correction amount for simulating a masking characteristic for each
frequency band, and based on the sum of the energy level of the first sound signal and the
energy level of the second sound signal A recruiting method for calculating a recruitment
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correction amount for simulating the recruitment phenomenon of the sensorinemic deaf person
for each frequency band First and second simulated auditory characteristics of the noisesensitive deaf person corresponding respectively to the first and second sound signals based on
the correction amount calculation means, the masking correction amount and the recruitment
correction amount It has a configuration to function as an auditory characteristic simulation
signal calculation unit that calculates an auditory characteristic simulation signal of No. 2.
[0022]
According to this configuration, the auditory characteristic simulation program according to the
present invention differs from the conventional one in that the first and second sound signals are
based on the masking correction amount and the recruitment correction amount without giving a
noise signal component to a hearing person. Since it is possible to simulate the auditory
characteristics of a sensorineural deaf person corresponding to each of them, it is possible to
accurately simulate the auditory characteristics of a sensorineural deaf person without giving
discomfort to a hearing person.
[0023]
Further, the auditory characteristic simulation program of the present invention has a
configuration that causes the computer to function as a simulation signal mixing unit that mixes
the first auditory characteristic simulation signal and the second auditory characteristic
simulation signal.
[0024]
According to this configuration, the auditory characteristic simulation program according to the
present invention causes the listener of the reproduction sound to grasp the auditory
characteristics of the person with a sensitivity noise sensitivity by reproducing the simulated
mixed sound signal output from the simulated signal mixing means. it can.
[0025]
A mixing balance display program according to the present invention is a mixing balance display
program for causing a computer to function as a mixing balance display device that displays a
mixing balance state of the first auditory characteristic simulation signal and the second auditory
characteristic simulation signal. Level detection means for detecting the level of the first and
second auditory characteristic simulation signals for each frame of a predetermined time interval,
the first auditory characteristic simulation signal, and the second Level difference calculating
means for calculating a level difference from the auditory characteristic simulation signal, and a
weighted level for calculating a weighted level difference by weighting the level difference
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according to the level of the first auditory characteristic simulation signal Means for calculating
the difference between the current frame and the past n frames; Average level difference
calculating means for calculating an average value of m values in order from the first to the last,
and a level average value of the first auditory characteristic simulation signal between the
current frame and a predetermined number of past frames; (1) The first auditory characteristic
simulation signal and the second auditory characteristic based on the calculation results of the
auditory characteristic simulation signal average value calculation unit, the average level
difference calculation unit, and the first auditory characteristic simulation signal average value
calculation unit Display value determining means for determining a display value indicating a
mixing balance state with a simulation signal, and a display control signal for controlling an
output of the display value determination means based on the level of the first auditory
characteristic simulation signal The display control signal generation means and the mixing
balance display means for displaying the state of the mixing balance on the basis of the display
control signal are provided.
[0026]
With this configuration, the mixing balance display program of the present invention can urge
the voice mixer to lower the level of the simulated BGM signal when the level of the simulated
BGM signal is greater than the level of the simulated NR signal. Since it is possible to prevent in
advance the phenomenon that the NR is difficult to hear because the level is too large, it is
possible to support the improvement of the sound effect of the program.
[0027]
The present invention provides an auditory characteristic simulation device, a mixing balance
display system, and a program for the same that have the effect of being able to accurately
simulate the auditory characteristics of a sensorinergic deaf person without giving discomfort to
a hearing person. It can be done.
[0028]
Hereinafter, embodiments of the present invention will be described using the drawings.
The auditory characteristic simulation apparatus of the present invention is referred to as an
apparatus for simulating the auditory characteristics of an elderly person (hereinafter referred to
as "elderly person auditory simulation apparatus".
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Will be described by way of an example applied to those simulating NR signals and BGM signals
at the time of program production such as television and radio.
The NR signal and the BGM signal in the embodiment correspond to the first and second sound
signals described in the claims, respectively.
[0029]
First Embodiment FIG. 1 is a block diagram showing an elderly person hearing simulation
apparatus according to a first embodiment of the present invention.
[0030]
As shown in FIG. 1, the elderly person hearing simulation apparatus 100 according to the present
embodiment has AD converters 11 and 12 for converting analog signals to digital signals, and a
time frequency for converting time domain signals to frequency domain signals. It comprises
conversion units 13 and 14, energy level calculation units 15 and 16 for calculating the energy
level of signals in the frequency domain for each frequency band, and a masking correction
amount calculation unit 17 for calculating the masking correction amount.
[0031]
In addition, the elderly person hearing simulation apparatus 100 includes a recruitment
simulation unit 18 that simulates an aging recruitment phenomenon, a frequency characteristic
correction unit 19 that corrects a frequency characteristic, and a frequency that converts a signal
in the frequency domain into a time domain signal. The time conversion units 20 and 21 and DA
conversion units 22 and 23 that convert digital signals into analog signals are provided.
[0032]
The AD converters 11 and 12 respectively receive an NR signal and a BGM signal which are
analog signals, and convert the analog value into a digital value.
However, when the input NR signal and BGM signal are digital signals, the AD converters 11 and
12 are unnecessary.
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[0033]
The time frequency conversion units 13 and 14 respectively convert the NR signal and the BGM
signal in the time domain into signals in the frequency domain, and output data of respective
frequency coefficients.
For example, the time frequency transform units 13 and 14 execute FFT (Fast Fourier Transform)
processing every 1024 samples, calculate FFT coefficients as frequency coefficients, and
calculate FFT power spectrum coefficients from the frequency coefficients. There is.
Note that the time frequency conversion is not limited to that by FFT, and for example, DCT
(discrete cosine transform) may be used.
[0034]
The energy level calculators 15 and 16 respectively calculate the energy levels of the NR signal
and the BGM signal in the frequency domain for each frequency band.
The energy level calculators 15 and 16 constitute an energy level calculator according to the
present invention.
[0035]
The masking correction amount calculation unit 17 is configured to calculate the amount of
interference due to BGM with respect to NR as a masking correction amount based on the energy
level difference of the NR signal and the BGM signal for each frequency band.
Since the auditory masking characteristics change with age, the masking correction amount
calculator 17 calculates the masking correction amount to simulate the auditory masking
characteristics unique to the elderly.
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The masking correction amount calculation unit 17 includes a memory (not shown), and stores
data used when calculating the masking correction amount in this memory.
This data can be arbitrarily changed according to the desired auditory characteristics.
The masking correction amount calculation unit 17 constitutes a masking correction amount
calculation means according to the present invention.
[0036]
The recruitment simulation unit 18 calculates the recruitment correction amount for simulating
the recruitment phenomenon of the elderly based on the sum of the energy level of the NR signal
and the energy level of the BGM signal for each frequency band. There is.
The recruitment simulation unit 18 includes a memory (not shown), and stores data used to
calculate the recruitment correction amount in this memory.
This data can be arbitrarily changed according to the desired auditory characteristics.
The recruitment simulation unit 18 constitutes a recruitment correction amount calculation unit
and an auditory characteristic simulation signal calculation unit according to the present
invention.
[0037]
Here, the recruitment correction amount refers to an aging recruitment phenomenon in which
when the hearing loss decreases with age, the physical sound pressure level that can not be
heard at high frequencies increases while the maximum sound pressure level that can be heard
does not change. It is intended to simulate, and indicates the attenuation of the loudness
perceived by the elderly.
08-05-2019
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More specifically, with regard to the aging recruitment phenomenon, if the magnitude is
gradually increased from small to large, it will not be heard as small but it will be heard rapidly
from a certain level of sound and will be loud immediately. It is a phenomenon that is felt by
[0038]
In addition, the recruitment simulation unit 18 corrects the energy levels of the NR signal and the
BGM signal for each frequency band based on the masking correction amount for each frequency
band and the recruitment correction amount for each frequency band, thereby It is configured to
output an NR signal and a BGM signal that simulate hearing deterioration characteristics.
[0039]
The frequency characteristic correction unit 19 corrects the FFT power spectrum coefficient of
the energy level of the NR signal and the BGM signal, which the recruitment simulation unit 18
simulates the aging recruitment phenomenon, for each frequency band.
[0040]
The frequency-time conversion units 20 and 21 convert signals indicating FFT power spectrum
coefficients of the NR signal and the BGM signal corrected by the frequency characteristic
correction unit 19 into signals in the time domain.
[0041]
The DA converters 22 and 23 respectively convert the NR signal and the BGM signal, which are
digital signals converted to time domain signals, into analog signals and output the analog
signals.
However, when the NR signal and the BGM signal are output as digital signals, the DA converters
22 and 23 are unnecessary.
[0042]
Next, the operation of the elderly person hearing simulation apparatus 100 according to the
present embodiment will be described.
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[0043]
First, the AD conversion units 11 and 12 respectively receive the NR signal and the BGM signal
which are analog signals, and convert the NR signal and the BGM signal into, for example, a
digital signal having a sampling frequency of 32 kHz and a quantization accuracy of 16 bits. .
The sampling frequency in the present embodiment will be described below as 32 kHz.
[0044]
The time frequency conversion units 13 and 14 convert the NR signal and BGM signal in the time
domain into signals in the frequency domain, respectively.
For example, the time-frequency transform units 13 and 14 perform FFT processing every 1024
samples, and determine 16 FFT coefficients as one group, thereby treating the FFT coefficients as
frequency coefficients in a frequency band every 500 Hz. be able to.
In addition, the time frequency conversion units 13 and 14 output the square of the frequency
coefficient as an FFT power spectrum coefficient.
[0045]
Here, the frequency coefficients of the NR signal and the BGM signal in the kth frequency band
are represented by NR_FFT [k] [i] and BGM_FFT [k] [i], respectively, and the NR signal and the
BGM signal in the kth frequency band The FFT power spectrum coefficients of are denoted by
NR_pow [k] [i] and BGM_pow [k] [i], respectively.
ただし、k=1、2、・・・、32であり、i=1、2、・・・、16である。
The time-frequency conversion units 13 and 14 calculate FFT power spectrum coefficients
08-05-2019
13
NR_pow [k] [i] and BGM_pow [k] [i] based on [Equation 1] and [Equation 2], respectively.
[0046]
[0047]
In place of the method using [Equation 1] and [Equation 2], the FFT power spectrum coefficient
may be calculated by converting the frequency coefficient into power.
[0048]
The energy level calculators 15 and 16 respectively calculate the energy levels of the NR signal
and the BGM signal in the frequency band every 500 Hz as follows.
Here, N (k) and B (k) (k = 1, 2,..., 32) respectively represent energy levels of the NR signal and the
BGM signal in frequency bands of 500 Hz, N (N) k) and B (k) are represented by [Equation 3] and
[Equation 4], respectively, and are obtained by performing dB (decibel) conversion after
calculating the sum of the FFT power spectrum coefficients.
[0049]
[0050]
The masking correction amount calculation unit 17 calculates a masking correction amount D_m
(k) based on the difference between N (k) and B (k).
According to the inventor's examination results, the masking correction amount D_m (k) is set to
a predetermined value by the relationship between the difference between N (k) and B (k) and
the two predetermined threshold values. It turned out to be preferable.
Specifically, as shown in FIG. 2, two predetermined threshold values are respectively represented
by R1 (k) and R2 (k), and the masking correction amount D_m (k) corresponding to each of them
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14
is L_YM (k). And L_OM (k), it is preferable to set R1 (k) = 12 dB and R2 (k) = 0 dB, and it is
preferable to set L_YM (k) = 0 dB and L_OM (k) =-9 dB.
In this case, the masking correction amount D_m (k) is expressed by [Equation 5].
[0051]
[0052]
Note that the equation shown in [Equation 5] is an example, and it can be deformed according to
the value of each threshold for calculating the masking correction amount D_m (k), and in FIG.
Although an example in which k) and L_OM (k) are connected by a straight line has been
described, the present invention is not limited to this, and it is sufficient that the two points are
connected by a monotonous function.
[0053]
The recruitment simulation unit 18 calculates a recruitment correction amount as described
below.
[0054]
First, the recruitment simulation unit 18 adds N (k) and B (k) by dB based on [Equation 6] to
calculate NpB (k) indicating the energy sum of the NR signal and the BGM signal.
[0055]
[0056]
Next, the recruitment simulation unit 18 is a minimum audible indication of the relationship
between the minimum sound pressure and the frequency which can be heard by persons of
different ages, for example, those in the twenties and sixties, which are predetermined. The
recruitment correction amount D_r (k) is calculated based on values derived from the limit
characteristics, specifically, the characteristics as shown in FIG.
[0057]
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15
Here, FIG. 3 shows the relationship between the sound pressure level perceived by the elderly
due to the recruitment phenomenon and NpB (k).
In FIG. 3, L_Th (k) is a sound pressure level at which the recruitment phenomenon does not
occur when the NpB (k) is increased from the region where the recruitment phenomenon is
occurring (hereinafter referred to as "saturation level").
For example, it is a loudness level which persons in their twenties and sixties feel equal to each
other.
Further, in FIG. 3, Y_MAF (k) and O_MAF (k) are threshold values derived and determined from
the minimum audibility limits of 20's and 60's respectively, and are set as optimum values for
each frequency band. Is preferred.
For example, according to the study result of the inventor, 500 Hz to 1000 Hz (frequency band k
= 2).
In the above, it is preferable to set Y_MAF (2) = 0 dB, O_MAF (2) = 30 dB, and saturation level
L_Th (2) = 90 dB.
[0058]
The recruitment correction amount D_r (k) is calculated based on, for example, a function as
shown in FIG.
As shown in FIG. 4, when NpB (k) is equal to or higher than the saturation level L_Th (k), the
recruitment simulation unit 18 uses a predetermined threshold L_0 (k) (for example, 0 dB) as the
recruitment correction amount D_r (k). When NpB (k) is less than the saturation level L_Th (k),
the recruitment correction amount D_r (k) is output according to a linear function determined
according to a predetermined threshold value α.
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16
That is, the recruitment correction amount D_r (k) is expressed by [Equation 7].
The threshold value α is expressed by [Equation 8].
[0059]
[0060]
Further, the recruitment simulation unit 18 calculates the masking correction amount D_m (k)
calculated by the masking correction amount calculation unit 17 and the recruitment correction
amount D_r (k) calculated based on [Equation 7]. And N ′ (k) and B ′ (k) indicating simulated
signals of the NR signal and the BGM signal, respectively, based on the equation [10].
[0061]
[0062]
Therefore, the recruitment simulation unit 18 outputs N ′ (k) and B ′ (k) that simulate the
hearing impairment characteristics of the elderly by the masking correction amount D_m (k) and
the recruitment correction amount D_r (k). can do.
[0063]
Note that the recruitment simulation unit 18 determines, for example, the threshold O_MAF (k)
and the saturation level L_TH (k) according to the average hearing characteristic of the age of the
simulation target person and the measurement value of the hearing characteristic of the hearing
simulation target person himself. Is preferably variable for each frequency band, and this
configuration enables simulation to be performed more accurately in accordance with the
auditory characteristics of the person to be simulated.
[0064]
The frequency characteristic correction unit 19 corrects the energy of N ′ (k) and B ′ (k) in the
kth frequency band based on [Equation 11] and [Equation 12].
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17
Here, FFT power spectrum coefficients of N ′ (k) are NR_pow ′ [k] [i] (i = 1, 2,..., 16), and FFT
power spectrum coefficients of B ′ (k) are BGM_pow ′ [ k] [i] (i = 1, 2,..., 16).
[0065]
[0066]
FIG. 5 is a diagram conceptually showing the characteristic correction by the frequency
characteristic correction unit 19. FIG. 5 (a) shows the magnitude of the correction amount of the
FFT power spectrum coefficient which becomes a constant amount in each frequency band.
There is.
The correction amount shown in FIG. 5A corresponds to D_m (k) + D_r (k) for the NR signal, and
corresponds to D_r (k) for the BGM signal.
[0067]
Further, FIG. 5 (b) shows an example of smoothing of energy correction of the FFT power
spectral coefficient by moving average, although it is approximate calculation.
In this method, for example, the frequency-time conversion units 20 and 21 perform frequencytime conversion by reducing the difference between the correction amounts of the FFT power
spectrum coefficients at the boundaries of adjacent frequency bands with respect to the
correction amounts of the FFT power spectrum coefficients. When done, it is a method expected
to reduce distortion detected aurally.
[0068]
Specifically, for example, in the case of performing moving average calculation for every five FFT
power spectra, correction of four FFT power spectra (within a rectangular frame in FIG. 5B) at the
boundary between adjacent frequency bands It is sufficient to perform moving average
calculations on quantities.
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[0069]
That is, for the NR signal, the frequency characteristic correction unit 19 obtains, for example,
NR_pow '[k] [1] in the frequency band of k = 2, 3,.
[0070]
[0071]
Further, NR_pow '[k] [2] is obtained by [Equation 14].
[0072]
[0073]
Next, in the frequency band of k = 1, 2,..., 31, for example, NR_pow ′ [k] [15] is obtained by
[Equation 15].
[0074]
[0075]
Further, NR_pow '[k] [16] is obtained by [Equation 16].
[0076]
[0077]
Similarly, for the BGM signal, BGM_pow '[k] [1] is obtained by [Equation 17] in the frequency
bands of k = 2, 3,..., 32.
[0078]
[0079]
Further, BGM_pow '[k] [2] is obtained by [Equation 18].
08-05-2019
19
[0080]
[0081]
Next, in a frequency band of k = 1, 2,..., 31, for example, BGM_pow ′ [k] [15] is obtained by
[Equation 19].
[0082]
[0083]
Further, BGM_pow '[k] [16] is obtained by [Equation 20].
[0084]
[0085]
As described above, when the frequency characteristic correction unit 19 performs each
calculation, the correction amount between the frequency bands can be smoothed.
[0086]
In the above example, moving average processing is performed for each of the five FFT power
spectrum coefficients, but the number of coefficients to be smoothed is arbitrary.
Further, instead of the moving average processing, for example, smoothing processing by spline
interpolation may be performed.
In addition, although the correction processing method of the FFT power spectrum coefficient
has been described as an example, for example, the correction of the frequency characteristic is
also realized by a method by time-varying filter processing in block units performing time
frequency conversion in the frequency time conversion units 20 and it can.
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[0087]
Continued to explain the operation.
The frequency-time converters 20 and 21 perform frequency-time conversion of the NR signal
and the BGM signal, respectively, and output the result to the DA converters 22 and 23.
[0088]
The DA converters 22 and 23 respectively convert the NR signal and the BGM signal of the
digital signal into an analog signal and output it.
[0089]
Note that by programming each process described in the description of the operation and
operating the computer by the program, the program can cause the computer to function as the
elderly person hearing simulation device 100.
In this case, the computer has the configuration shown in FIG.
[0090]
As described above, according to the elderly person hearing simulation apparatus 100 in the
present embodiment, the masking correction amount calculation unit 17 determines the amount
of interference by BGM with respect to NR based on the energy level difference of NR signal and
BGM signal for each frequency band. The recruitment simulation unit 18 calculates a masking
correction amount as a masking correction amount based on the sum of the energy level of the
NR signal and the energy level of the BGM signal. Since the calculation is made for each time, the
hearing characteristics of the elderly can be accurately simulated.
[0091]
Further, unlike the conventional device, the elderly person hearing simulation device 100
according to the present embodiment does not have a configuration for giving a noise signal
component to a hearing person, so the elderly person does not feel discomfort to the hearing
person. Can accurately simulate the auditory characteristics of
08-05-2019
21
[0092]
Therefore, the elderly person hearing simulation device 100 according to the present
embodiment can provide the mixing device for mixing the NR signal and the BGM signal with the
NR signal and the BGM signal accurately simulating the hearing characteristics of the elderly
person. , It can support the production of programs that can obtain appropriate sound effects for
the elderly.
[0093]
Although the embodiment of the present invention has been described by taking the elderly
person hearing simulation device 100 for simulating the hearing characteristics of the elderly
person as an example, the present invention is not limited to this, and the feeling other than the
elderly person The same effect can be obtained even when applied to a device that simulates the
auditory characteristics of a person with hearing loss.
[0094]
Further, in the above-described embodiment, the elderly person hearing simulation apparatus
100 has been described by giving an example for NR signals and BGM signals, but the present
invention is not limited to this. For example, The same effect can be obtained by applying the
present invention to an audio signal and a sound effect signal.
[0095]
Second Embodiment FIG. 6 is a block diagram showing an elderly person hearing simulation
apparatus according to a second embodiment of the present invention.
[0096]
As shown in FIG. 6, the elderly person hearing simulation apparatus 200 in the present
embodiment includes the elderly person hearing simulation apparatus 100 (see FIG. 1) in the
first embodiment, and a mixer 201.
[0097]
The mixer 201 receives the NR signal and BGM signal simulating the hearing of the elderly
person from the DA conversion units 22 and 23 of the elderly person hearing simulation device
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100 respectively, mixes them, and simulates the elderly person mixed sound signal Is supposed
to be output.
The mixer 201 constitutes a simulated signal mixing unit according to the present invention.
[0098]
Since the elderly person hearing simulation device 200 in the present embodiment is configured
as described above, by reproducing the elderly person simulated mixed sound signal, the listener
of the reproduction sound is made to grasp the hearing characteristics of the elderly person. be
able to.
For example, the elderly person hearing simulation apparatus 200 causes the young voice mixer
in the 20s to 30s to reproduce and listen to the elderly person simulated mixed sound signal,
thereby causing the user to experience the phenomenon that the BGM is too large and the NR is
difficult to hear. As a result, it is possible to make the young voice mixer recognize the need for
sound effects appropriate for the elderly.
[0099]
In addition, by allowing the young people to listen to the elderly person simulated mixed sound
signal output by the elderly person hearing simulation device 200, it is possible to promote not
only the young voice mixer but also the young person's understanding of the elderly person, and
more barrier-free. It can be a catalyst for realizing a socially
[0100]
Third Embodiment FIG. 7 is a block diagram showing a mixing balance display system according
to a third embodiment of the present invention.
Here, the mixing balance display system in the present embodiment monitors the mixing balance
of the NR signal and the BGM signal at the time of program production such as a television or
radio, and for example, when the level of the BGM signal is too large and it is difficult to hear the
NR. "If the BGM signal level is too high." Conversely, if the BGM signal level is too small to
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23
produce an acoustic effect, a warning or warning such as "BGM signal level is too small" will be
sent to the voice mixer. It is done against.
[0101]
First, the configuration of the mixing balance display system 300 according to the present
embodiment will be described.
[0102]
As shown in FIG. 7, the mixing balance display system 300 according to the present embodiment
includes the elderly person hearing simulation device 100 (see FIG. 1) according to the first
embodiment, and the mixing balance display device 310.
The description of the configuration of the elderly person hearing simulation apparatus 100 is
omitted.
Moreover, NR signal and BGM signal which simulated the auditory characteristic of the elderly
person which elderly person auditory simulation apparatus 100 outputs are respectively called
"simulated NR signal" and "simulated BGM signal" hereafter.
[0103]
The mixing balance display device 310 includes an AD converter 311 which converts a simulated
NR signal which is an analog signal into a digital signal, an AD converter 312 which converts a
simulated BGM signal which is an analog signal into a digital signal, and a level of the simulated
NR signal. , The BGM level detection unit 314 that detects the level of the simulated BGM signal,
the level difference calculation unit 315 that calculates the level difference between the
simulated NR signal and the simulated BGM signal, and the level difference Weighted level
difference calculating section 316 for calculating a weighted level difference, an average level
difference calculating section 317 for calculating an average value of weighted level difference
values, and an average of levels of the simulated NR signal. NR average value calculation unit
318 that calculates a value, and display value determination unit 319 that determines a display
value that indicates the state of mixing balance , And a display control signal generation unit 320
for generating a display control signal for controlling the output of the display value
determination unit 319, and a level meter such as a VU (Volume Unit) meter, for example, to
display the state of mixing balance The display unit 321 is provided.
08-05-2019
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[0104]
The AD conversion units 311 and 12 receive the simulated NR signal and the simulated BGM
signal, respectively, and convert the analog value into a digital value.
For example, each of the AD conversion units 311 and 12 converts an analog signal into a digital
signal having a sampling frequency of 48 kHz and a quantization accuracy of 16 bits.
However, when the input simulated NR signal and the simulated BGM signal are digital signals,
the AD converters 311 and 312 are unnecessary.
In the following description, it is assumed that the sampling frequency in the present
embodiment is 48 kHz.
[0105]
The NR level detection unit 313 detects the loudness level (phon) of the simulated NR signal
every fixed short time ΔT.
Here, the constant short time ΔT is approximately 21.3 ms (= 1024/48000 s) when acquiring,
for example, 1024 samples at a sampling frequency of 48 kHz.
The NR level detection unit 313 acquires 1024 samples at a sampling frequency of 48 kHz, and
in the following description, an acquisition unit of 1024 samples is referred to as a frame.
[0106]
Like the NR level detection unit 313, the BGM level detection unit 314 detects the loudness level
of the simulated BGM signal for each frame.
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[0107]
The NR level detection unit 313 and the BGM level detection unit 314 constitute a level detection
unit according to the present invention.
Further, as a method for the NR level detection unit 313 and the BGM level detection unit 314 to
detect the loudness level of each signal, for example, one standardized by ISO 532 is known.
The average energy level (dB) of each signal may be calculated instead of the loudness level. In
this case, for example, the root mean square of the sample values may be calculated and
converted into dB.
[0108]
In the following description, the loudness level (phon) of the simulated NR signal mixed at an
appropriate level will be expressed using a relative level normalized to zero.
Also, the level of the simulated BGM signal is also expressed using the relative level normalized to
the same level as the simulated NR signal.
For example, when the loudness level of the simulated NR signal mixed at the appropriate level is
70 (phon), the loudness level of the simulated NR signal or the simulated BGM signal is 70
(phon), the relative value of the signal. The level is 0, and at 75 (phon), the relative level of the
signal is +5.
[0109]
Also, if the relative level after normalization is, for example, around -50 or less, the loudness
levels of the simulated NR signal and the simulated BGM signal are audibly very small, so all
values below -50 should be -50. The replacement is sufficient for practical use.
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In addition, although the process mentioned later can also be performed without normalizing by
0, the value of each threshold value changes relatively in that case.
Hereinafter, the relative level of the normalized simulated NR signal is represented as “N”, and
the relative level of the normalized simulated BGM signal is represented as “B”.
[0110]
The level difference calculation unit 315 receives the relative level N of the simulated NR signal
and the relative level B of the simulated BGM signal from the NR level detection unit 313 and the
BGM level detection unit 314, respectively, for each frame, and the relative levels of both
Difference (hereinafter referred to as "relative level difference".
) B-N is to be calculated.
The level difference calculation unit 315 constitutes level difference calculation means according
to the present invention.
[0111]
The weighted level difference calculation unit 316 calculates the weighted level difference by
weighting the relative level difference B-N calculated by the level difference calculation unit 315
according to the magnitude of the relative level N of the simulated NR signal. It is supposed to be.
The weighted level difference calculation unit 316 is provided with a memory (not shown), and
this memory is configured to sequentially store each value of the calculated weighted level
difference.
[0112]
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27
Specifically, the weighted level difference calculation unit 316 weights the relative level
difference B-N by using a level weighting function as shown in FIG. 8, for example.
In FIG. 8, the weighted level difference calculation unit 316 outputs a signal with a relative level
of −50 when N <−30, and outputs a signal with a relative level of B−N when N> −15. When
−30 ≦ N ≦ −15, a signal having a relative level of N (B−N + 50) / 15 + 2 (B−N) +50 is output.
[0113]
Although FIG. 8 illustrates an example in which two points of coordinates (-30, -50) and (-15, BN) are connected by a straight line, the present invention is not limited to this. If these two points
are connected by a monotonous function, it is sufficient for practical use.
In addition, the weighted level difference calculation unit 316 constitutes weighted level
difference calculation means according to the present invention.
Further, in FIG. 8, N = −30 and N = −15 correspond to the first threshold T1 and the second
threshold T2 described in the claims respectively.
[0114]
Next, signals output from the level difference calculation unit 315 and the weighted level
difference calculation unit 316 will be described using the schematic diagram of FIG.
When the relative levels of the simulated NR signal and the simulated BGM signal input to the
level difference calculation unit 315 are in the relationship as shown in FIG. 9A, the level
difference calculation unit 315 first performs the process shown in FIG. The relative level
difference B-N as shown is calculated.
Next, the weighted level difference calculation unit 316 weights the value of the calculated
relative level difference B-N with the weighting function illustrated in FIG. 8 to obtain a weighted
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relative level as shown in FIG. 9B. Calculate the difference B-N.
[0115]
As shown in FIG. 9B, the relative level difference B-N increases as the relative level B of the
simulated BGM signal increases or as the relative level N of the simulated NR signal decreases.
When the relative level N of the simulated NR signal is small, that is, when there is almost no
simulated NR signal, it is not necessary to display "the simulated BGM signal is too large", so the
weight function as illustrated in FIG. In the case where the relative level N of the simulated NR
signal is small, as shown in FIG. 9C, the value of the weighted relative level difference B-N is
reduced.
That is, it can not be determined whether the "simulated BGM signal is too large" with the
magnitude of the value of the relative level difference B-N before weighting (FIG. 9B), but the
weighted relative level difference is not By using the magnitude of the value of B-N (FIG. 9C), it
can be determined whether or not "simulated BGM signal is too large".
[0116]
The average level difference calculation unit 317 calculates an average value of m values in order
from the largest value of the weighted level difference BN between the current frame and the
past n frames (hereinafter referred to as “percent time rate average "Level difference".
) To calculate.
Here, n and m are positive integers, and there is a relation of n ≧ m.
The average level difference calculating unit 317 constitutes an average level difference
calculating unit according to the present invention.
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[0117]
As n increases, the long silent interval can be removed, so the change of the indication value of
the level meter of the display unit 321 can be gradual, but if n is too large, the silent interval
continues for a long time. However, since an indicated value that is not 0 is indicated for a long
time, it is necessary to set an appropriate length.
Also, as m increases, the change in the indicated value of the level meter can be made more
gradual, but the rise time of the indicated value will be delayed, so it is necessary to reduce m
somewhat to shorten the rise time of the indicated value. There is.
For practical purposes, it is preferable to use, for example, n = 100 and m = 4 to obtain a
percentage time rate average level difference corresponding to 4%.
[0118]
By using the percentage time rate average level difference calculated by appropriately setting n
and m, it is possible to make a judgment that matches well with the elderly people's sense of
hearing about the difference in loudness between the simulated NR signal and the simulated
BGM signal. .
The percentage time rate average level difference is described in detail in Japanese Patent No.
3462390.
[0119]
According to the inventor's study results, in the case of stereo signals, regardless of the type of
sound material, if the mixing balance between the simulated NR signal and the simulated BGM
signal is appropriate, the output of the average level difference calculation unit 317 The relative
level of the signal is approximately zero.
[0120]
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30
Next, only in the frame in which the simulated NR signal is present, the larger the percentage
time rate average level difference is, "the simulated BGM signal is too large", and the smaller the
smaller the "simulated BGM signal is too small (no effect of BGM) When trying to display “”,
the level of “simulated BGM signal is more appropriate than that displayed as“ simulated BGM
signal is too large ”or“ simulated BGM signal is too small ”in the frame where there is no
simulated NR signal. It is aurally preferable to be displayed as "A".
Therefore, the NR average value calculating unit 318 and the display value determining unit 319
in the present embodiment are configured as follows.
[0121]
That is, the NR average value calculating unit 318 is configured to calculate the level average
value NA of the simulated NR signal in the period from the current frame to a predetermined
number (for example, several to several tens of frames) of the past.
The NR average value calculation unit 318 constitutes a first auditory characteristic simulation
signal average value calculation unit according to the present invention.
[0122]
Further, the display value determination unit 319 compares the level average value NA of the
simulated NR signal with a predetermined threshold value LT to determine a display value
indicating the state of mixing balance.
Specifically, the display value determination unit 319 sets the output value of the average level
difference calculation unit 317 as the display value when the level average value NA of the
simulated NR signal is NA ≧ LT, and the average level when NA <LT. The output value of the
difference calculation unit 317 is converted into a value when the mixing balance is appropriate
to be a display value. The display value determination unit 319 constitutes a display value
determination unit according to the present invention.
[0123]
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31
Here, by using the average value NA instead of the relative level N of the simulated NR signal, it
is possible to prevent inappropriate determination at the rising and falling portions of the
percent time rate average level difference. In order to prevent the inappropriate determination
more reliably, it is better to make the number averaged by the NR average value calculation unit
318 larger than the number m in the average level difference calculation unit 317. The value of
the percentage time rate average level difference when the mixing balance is appropriate needs
to be measured by performing a psychological experiment, but in the case of a stereo signal, the
relative level of the value is approximately 0.
[0124]
Practically, the NR average value calculation unit 318 calculates the average value of the relative
levels of the simulated NR signal, assuming that the number of frames for calculating the average
value NA is, for example, 14 (21.3 ms × 14 = 298 ms). If it is As a result, the value of the
average value NA fluctuates at a rise time substantially equal to the rise time (about 300 ms) of
the VU meter. Further, the threshold value LT may be set to a value of about -15 at the relative
level. In this case, the display value determination unit 319 outputs the output value of the
average level difference calculation unit 317 as it is when the average value NA is about -15 or
more, and the average level when the average value NA is less than about -15. The output value
of the difference calculation unit 317 is converted to a value (for example, relative level = 0)
when the mixing balance is appropriate. Therefore, when the average value NA is less than about
-15, that is, in a frame where it is considered that the simulated NR signal does not exist, "the
simulated BGM signal level is displayed" is displayed, and the elderly person's hearing sense is
matched. Display will be obtained.
[0125]
Here, if the output value determined by the display value determination unit 319 is constantly
displayed on the display unit 321, the display unit 321 outputs a “simulated BGM signal even
when there is no simulated NR signal for a long time (for example, 5 seconds). Level is
appropriate. " Therefore, when the simulated NR signal does not exist for a long time, the display
control signal generation unit 320 according to the present embodiment is configured as follows,
since it is aurally better to turn off the display itself if it is not present for a long time. There is.
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[0126]
That is, the display control signal generation unit 320 compares the relative level N of the
simulated NR signal with the predetermined threshold LG for each frame, and among the frames
in which the relative level N of the simulated NR signal is N ≧ LG. The output signal from the
display value determination unit 319 for a predetermined number of frames from the frame
closest to the current frame is controlled to be input to the display unit 321, and the output
signal from the display value determination unit 319 when the predetermined number is
exceeded And to generate a display control signal for controlling not to display. The display
control signal generator 320 constitutes a display control signal generator according to the
present invention.
[0127]
In practice, the threshold LG may be about -15 in relative level. In addition, when the relative
level of the simulated NR signal is instantaneously reduced, for example, about 50 to 100 are
appropriate as the above-mentioned predetermined number in order to remove the influence
when the relative level is reduced by about 100 ms. The time when the predetermined number is
100 is 21.3 ms × 100 = 2.13 s.
[0128]
The display unit 321 includes, for example, a level meter, and is configured to display the output
value of the display value determination unit 319 based on the display control signal generated
by the display control signal generation unit 320. The display unit 321 constitutes mixing
balance display means according to the present invention.
[0129]
The display unit 321 may classify and display the output value of the display value determination
unit 319 into, for example, several to dozens of levels. Specifically, when the level of the
simulated BGM signal is classified into, for example, seven levels and displayed on the display
unit 321, the value of the output of the display value determination unit 319 is classified into
seven levels in order from the larger one. A level of “very too large”, “too large”,
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“somewhat large”, “appropriate”, “somewhat small”, “too small”, “very too small” or
the like may be displayed. Although it is necessary to obtain six boundary values for classifying
the level of the simulated BGM signal into seven levels as described above by conducting
psychological experiments, the relative levels of the six boundary values are approximately 6, 4,
2 , -3, -6, and -9 are preferable. According to this configuration, it is possible to display the state
of the mixing balance with high visibility corresponding to the hearing of the elderly.
[0130]
Next, the operation of the mixing balance display device 310 in the present embodiment will be
described.
[0131]
First, the AD conversion unit 311 inputs a simulated NR signal and converts it into a digital
signal, and the AD conversion unit 312 inputs a simulated BGM signal and converts it into a
digital signal.
[0132]
The NR level detection unit 313 detects the level of the simulated NR signal for each frame, and
the BGM level detection unit 314 detects the level of the simulated BGM signal for each frame.
[0133]
After the level difference calculation unit 315 calculates the level difference between the
simulated NR signal and the simulated BGM signal, the weighted level difference calculation unit
316 compares the level difference calculated by the level difference calculation unit 315 with, for
example, FIG. Weighted level difference is calculated by weighting based on the weighting
function shown.
[0134]
The average level difference calculation unit 317 calculates the percentage time rate average
level difference, that is, m in order from the one with the largest value of the weighted level
difference B-N between the current frame and the past n frames. Calculate the average of the
values.
[0135]
The NR average value calculation unit 318 calculates the level average value NA of the simulated
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NR signal between the current frame and a predetermined number (for example, several to
several tens of frames) of the past.
[0136]
The display value determination unit 319 sets the output value of the average level difference
calculation unit 317 as a display value when the level average value NA of the simulated NR
signal is NA ≧ LT, and when NA <LT, the display value determination unit 319 The output value
is converted to a value when the mixing balance is appropriate to be a display value.
[0137]
The display control signal generation unit 320 compares the relative level N of the simulated NR
signal with the predetermined threshold LG for each frame, and generates a display control
signal for controlling the output of the display value determination unit 319.
Specifically, the display control signal generation unit 320 generates the display value
determination unit 319 in a predetermined number of frames from the frame closest to the
current frame among the frames in which the relative level N of the simulated NR signal is N ≧
LG. And control the input signal from the display value determination unit 319 to be blocked
when the number exceeds a predetermined number, and to generate a display control signal for
controlling display not to be performed.
[0138]
Then, the display unit 321 displays the state of the mixing balance of the simulated NR signal
and the simulated BGM signal based on the display control signal generated by the display
control signal generation unit 320.
[0139]
Note that the program can cause the computer to function as the mixing balance display system
300 by programming the respective processes described in the operation description and
operating the computer by the program.
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In this case, the computer has the configuration shown in FIG.
[0140]
As described above, according to the mixing balance display system 300 in the present
embodiment, in the mixing balance display device 310, the weighted level difference calculating
unit 316 determines the level difference between the simulated NR signal and the simulated BGM
signal. To calculate the weighted level difference, the average level difference calculation unit
317 calculates the percentage time rate average level difference, and the NR average value
calculation unit 318 calculates the weighted average level difference from the current frame to a
predetermined number of past frames. The level average value NA of the simulated NR signal in
the interval is calculated, and the display value determination unit 319 compares the level
average value NA of the simulated NR signal with the threshold value LT to determine the display
value indicating the mixing balance state, and performs display control The signal generation
unit 320 generates a display control signal for controlling the output of the display value
determination unit 319, and the display unit 321 performs display control. Since the structure
for displaying the status of the mixing balance based on the item, it may be displayed in
correspondence to the state of the mixing balance hearing the elderly.
[0141]
Therefore, the mixing balance display system 300 according to the present embodiment can urge
the voice mixer to lower the level of the simulated BGM signal, for example, when the level of the
simulated BGM signal is greater than the level of the simulated NR signal. Since it is possible to
prevent in advance the phenomenon that the level of the signal is too large and it is difficult for
the NR to hear, it is possible to support improvement of the sound effect of the program.
In addition, the mixing balance display device 310 in the present embodiment, for example,
increases the level of the simulated BGM signal when the level of the simulated BGM signal is
smaller than the level of the simulated NR signal and the acoustic effect can not be obtained.
Since it can prompt, it can support improvement of the sound effect of a program.
[0142]
In the above-described embodiment, the mixing balance display system 300 has been described
by way of an example in which the NR signal and the BGM signal are used, but the present
invention is not limited to this. For example, speech of speech The same effect can be obtained by
applying the present invention to mixing of a signal and a sound effect signal.
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[0143]
In addition, the recruitment simulation unit 18 of the elderly person hearing simulation device
100 (see FIG. 1) listens to, for example, the average minimum audible limit value at the age of a
person or a voice mixer who listens to the simulation sound of the elderly person or the
simulation sound. The threshold Y_MAF is preferably configured to be variable for each
frequency band in accordance with the measurement value of the person's own minimum audible
lower limit value and the measurement of the minimum audible lower limit value of the audio
mixer itself. Can more accurately simulate the auditory characteristics of
[0144]
Next, another aspect of the present embodiment will be described.
As shown in FIG. 10, the mixing balance display system 400 includes an elderly person hearing
simulation device 410 and a mixing balance display device 420.
[0145]
In contrast to the configuration of the elderly person hearing simulation device 100 (see FIG. 1)
in the first embodiment, the elderly person hearing simulation device 410 has a frequency
characteristic correction unit 19, frequency time conversion units 20 and 21, and a DA
conversion unit. 22 and 23 are omitted.
[0146]
The mixing balance display device 420 is obtained by omitting the AD conversion units 311 and
312 from the configuration of the mixing balance display device 310 (see FIG. 7) in the present
embodiment.
In FIG. 10, a part of the configuration of the mixing balance display device 420 is omitted.
[0147]
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In the elderly person hearing simulator 410, the energy level calculators 15 and 16 respectively
calculate the energy levels of the NR signal and the BGM signal for each frequency band of 1/3
octave, and the masking correction amount calculator 17 and the recruitment. The simulation
unit 18 outputs N ′ (k) and B ′ (k) that simulate the hearing deterioration characteristics of the
elderly.
[0148]
Next, in the mixing balance display device 420, N ′ (k) and B ′ (k) are input, and based on
these, the loudness level conforming to ISO 532 is calculated.
[0149]
As a result, the mixing balance display system 400 can display the state of the mixing balance in
accordance with the elderly person's hearing.
[0150]
As described above, the auditory characteristic simulation device, the mixing balance display
system, and their programs according to the present invention can accurately simulate the
auditory characteristics of a sensorinergic deaf person without giving discomfort to the hearing
person. It is useful as an auditory characteristic simulation apparatus, a mixing balance display
system, and programs thereof for use in the production of television programs and radio
programs for sensuous deaf people such as elderly people.
[0151]
A block diagram showing a configuration of an elderly person hearing simulation apparatus
according to a first embodiment of the present invention An illustration of a setting example of a
masking correction amount in an elderly person hearing simulation apparatus according to a first
embodiment of the present invention The figure which shows the relationship between NpB (k)
and the sound pressure level which an elderly person perceives by the recruitment phenomenon
in the elderly person auditory simulation apparatus in a 1st embodiment The elderly person in a
1st embodiment of the present invention In the auditory simulation apparatus, an explanatory
diagram of a setting example of the recruitment correction amount. In the elderly person
auditory simulation apparatus according to the first embodiment of the present invention, a
diagram conceptually showing the characteristic correction by the frequency characteristic
correction unit (a) each frequency A conceptual diagram showing the magnitude of the
correction amount of the FFT power spectrum coefficient which becomes a constant amount in
the band (b) D of the FFT power spectrum coefficient in each frequency band A conceptual
diagram showing an example in which a correction is smoothed by moving average A block
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diagram showing a configuration of an elderly person hearing simulation apparatus according to
a second embodiment of the present invention A mixing balance display system according to a
third embodiment of the present invention Block diagram showing configuration In the mixing
balance display system according to the third embodiment of the present invention, a diagram
showing an example of a level weighting function In the mixing balance display system according
to the third embodiment of the present invention, NR signal and BGM signal (A) A diagram
showing an example of the relative level of the input NR signal and BGM signal (b) A diagram
showing an example of the relative level difference B-N (c) Weighted relative The figure which
shows an example of level difference BN The structure of the other aspect of the mixing balance
display system in the 3rd Embodiment of this invention. Block diagram showing
Explanation of sign
[0152]
11, 12, 311, 312 AD conversion unit 13, 14 Time-frequency conversion unit 15, 16 Energy level
calculation unit (energy level calculation means) 17 Masking correction amount calculation unit
(masking correction amount calculation means) 18 Recruitment simulation unit (recruitment)
Amount correction amount calculation means, auditory characteristic simulation signal
calculation means) 19 frequency characteristic correction unit 20, 21 frequency time conversion
unit 22, 23 DA conversion unit 100, 200, 410 elderly person hearing simulation device (hearing
characteristics simulation device) 201 mixer (Simulated signal mixing means) 300, 400 Mixing
balance display system 310, 420 Mixing balance display device 313 NR level detection part
(level detection means) 314 BGM level detection part (level detection means) 315 Level
difference calculation part (Level difference calculation means) ) 316 Weighted level difference
calculation Out part (weighted level difference calculation means) 317 average level difference
calculation part (average level difference calculation means) 318 NR average value calculation
part (first auditory characteristic simulation signal average value calculation means) 319 display
value determination part (display value determination Means) 320 display control signal
generation unit (display control signal generation means) 321 display unit (mixing balance
display means)
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