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JP2007082125

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DESCRIPTION JP2007082125
The present invention provides a sound image localization apparatus that solves the problem that
the sound quality is unnatural or hard to hear even if there are individual differences or
deviations from positions assumed to produce an effect. SOLUTION: In order to mix down 5ch
sound sources and combine them into 2ch, rear localization addition that adds rear localization
using head-to-ear transfer function from the rear to both ears, and the effect of this rear
localization addition are achieved A crosstalk cancellation correction circuit is provided. This
crosstalk cancellation uses the transfer function from the position of the front speaker to both
ears, and the left ear receives the sound source of only the left channel, and the right ear receives
the sound source of only the right channel. Process the sound source in the same way. The
adjustment panel 5 for adjusting to the listener is provided, and the center frequency of the peak
of the crosstalk cancellation correction filter can be adjusted by the frequency adjustment knob
51, and the gain of the center is adjusted by the gain adjustment knob 52 to adjust the Q value.
The width of the peak shape is adjusted by the knob 53. [Selected figure] Figure 4
Signal processing apparatus and sound image localization apparatus
[0001]
The present invention relates to a signal processing apparatus having a function of canceling a
transfer characteristic of a space propagation path from a speaker to a listener's ear such as a
crosstalk cancellation correction function, and a sound image localization apparatus for forming
a sound field based thereon.
[0002]
08-05-2019
1
Conventionally, a sound image localization apparatus having a crosstalk cancellation function has
been disclosed (see, for example, Patent Document 1).
The component that reaches the left ear from the right speaker or vice versa is called crosstalk,
and the function to cancel this is called crosstalk cancellation. This crosstalk cancellation is a
technology that eliminates localization of the speaker itself by allowing only the sound of the left
speaker to the left ear and the sound of the left speaker to the left ear. This technology models
the head-related transfer function from the sound source to the viewer's ear, and processes it
into a digital sound source by processing sound waves that cancel crosstalk at the point of the
viewer's ear by calculation using inverse matrix etc. It is And, such crosstalk cancellation is
carried out, for example, when sound localization from the rear side is performed using the head
related transfer function from the rear side using the front floor type speaker, or free sound field
formation is performed. Is required to bring out the effect. Patent Document 1 discloses a stereo
sound apparatus or the like that performs crosstalk cancellation and sound field formation using
a result of measuring in advance a head transfer function measured using a dummy head.
[0003]
However, when crosstalk cancellation and rear localization are added using head related transfer
functions, crosstalk cancellation is effective only in a pinpointed manner in the effective range,
and affects individual differences. Had a problem. Then, the means of patent documents 2-3 are
disclosed.
[0004]
In Patent Document 2, the head related transfer function reproduces a peak or dip on the
frequency characteristic different from that of the viewer for high frequency, so that unnatural
sound quality is obtained when realizing sound image localization. There is disclosed a sound
image localization control method for removing peaks and dips on unnecessary frequency
characteristics. JP 2001-086599 JP 6-178398
[0005]
08-05-2019
2
However, if the high frequency peak or dip is removed as unnecessary as in Patent Document 2,
there is a problem that the sound image localization effect is not sufficient in practice. On the
other hand, when the peak and the dip are left as they are, there is a problem that the sound
quality may be unnatural and difficult to hear due to the individual difference or the deviation
from the position where the head related transfer function is expected to be effective.
[0006]
Therefore, the present invention provides a sound image localization apparatus that solves the
problem that the sound quality is unnatural or hard to hear even if there are individual
differences or deviations from the position where the head related transfer function is expected
to be effective. To aim.
[0007]
In the present invention, means for solving the above-mentioned problems are configured as
follows.
[0008]
(1) According to the present invention, among the frequency characteristics of the cancellation
filter for canceling the transfer characteristic of the space propagation path from the speaker to
the listener's ear, the frequency obtained by smoothing the peak present at 7 to 10 kHz which is
the high frequency region A correction filter having a characteristic corrected, an equalizer for
boosting a part of the high frequency to reshape a peak, and an adjusting means for adjusting at
least a center frequency of the peak for a part of the high frequency region; It is characterized in
that it is a signal processing device which passes an input signal to the filter and the equalizer.
[0009]
The signal processing apparatus according to the present invention smoothes a peak existing at 7
to 10 kHz, which is a high frequency region, of the frequency characteristics of the filter,
assuming a cancellation filter that cancels the transfer characteristic of the space propagation
path leading to the ear. The configuration requirement is a correction filter that has been
corrected to the simplified frequency characteristics.
The correction filter smoothes the peaks and performs signal processing using this, so that
factors such as unnatural sound quality and difficulty in hearing are eliminated.
08-05-2019
3
However, since the sound image localization is not sufficient if the peaks are deleted in this way,
in the present invention, a peak part is newly added and this peak part can be adjusted by the
adjusting means.
As a result, not only the problem that the sound quality is unnatural but also the space
propagation from the sound source to the ear (hereinafter referred to as "real head transfer
function"). Signal processing can be performed such that sound image localization becomes
sufficient in accordance with the difference between individuals and the deviation from the
assumed position.
[0010]
The “cancellation filter for canceling the transfer characteristic of the space propagation path
from the speaker to the listener's ear” includes the above-described crosstalk cancellation, that
is, the component from the right speaker to the left ear or vice versa. Not only includes the
function of canceling the component crosstalk, but also at least cancels the propagation
characteristics of the component that reaches the right ear from the right speaker or the
component that reaches the left ear from the left speaker, In addition, any function that cancels
the transfer characteristic of the space propagation path leading to the listener's ear may be
included.
[0011]
(2) According to the present invention, there is provided a virtual characteristic giving filter for
imparting to an audio signal a transfer characteristic of a space transfer path from a virtually set
sound image localization to a listener's ear; A crosstalk cancellation filter for canceling the
transfer characteristic of the space propagation path from the position of the actual speaker to
the listener's ear; and the crosstalk cancellation filter comprising the signal processing device
according to claim 1 It is a sound image localization apparatus characterized by the above.
[0012]
By virtue of such construction, the crosstalk cancellation filter produces the effect of (1) in the
sound image localization apparatus, and the space effectively corresponding to the head transfer
function of the individual and the deviation from the assumed position. The transfer
characteristics of the propagation path can be canceled.
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4
Since it is premised that the effect of the crosstalk cancellation filter is sufficient, the virtual
characterization filter is adjustable by the adjusting means as in the configuration of (1).
This not only solves the problem that the sound quality is unnatural, but also the real head
related transfer function of the individual (the definition of "the real head related transfer
function" is described above. ) And the shift from the assumed position, the effect of sound image
localization can be sufficiently exhibited.
[0013]
According to the present invention, it is possible not only to solve the problem that the sound
quality is unnatural, but also to make the sound image localization sufficient in accordance with
the head transfer function of the individual and the deviation from the assumed position. .
[0014]
Next, the sound image localization apparatus of the present embodiment will be described using
FIG.
FIG. 1 shows the configuration at the time of reproduction of the sound image localization
apparatus according to the present embodiment. The outline of the configuration of the sound
image localization apparatus is as follows. That is, the digital audio signal of the input parts 23,
21 and 24 is taken in, the DSP 10 performs digital processing of this signal, the D / A converter
22 converts it into an analog audio signal, and the electronic volume 41 adjusts the volume. The
power amplifier 42 outputs this analog audio signal to the Lch speaker LS and the Rch speaker
RS to emit sound. In addition, the function of the sound image localization apparatus of the
present embodiment is, in a word, as shown in FIG. 1, mixing down the 5ch audio signals of Lch,
Rch, Cch, LSch, Rsch The speakers LS and RS are to create a sound image localization as if LSch
and RSch speakers are actually behind. Furthermore, the means of sound image localization will
be described in a single word. In the DSP 10, these five channels of digital sound source data
have a head-related transfer function from the rear to the human ear (details will be described
later). ) By adding the acoustic effect of rear localization addition 131LD to 131RD. Then,
crosstalk cancellation for achieving the effect of this acoustic effect (details will be described
later). These five-channel sound sources are processed using the), and output from the existing
speakers LS and RS. Hereinafter, these configurations will be described in order.
08-05-2019
5
[0015]
First, the signal input unit in FIG. 1 includes a digital interface represented by DIR 23, A / D
converter 21 and HDMI 24 (registered trademark, hereinafter the same) (however, in order to
configure the apparatus of this embodiment) It does not necessarily require all of these, and
there may be other input systems.) It is assumed that these signal input units can each input data
of 5 channels. That is, the 5ch is a digital voice input to the speakers of Lch (front left), Rch (front
right), Cch (front center), LSch (rear left), RSch (rear right). Lch is an output of an actual left front
speaker, and Rch is an output of an actual right front speaker. Cch does not actually exist in the
device of the present embodiment but is virtual. However, as shown in the DSP 10 of FIG. 1, the
device of the present embodiment distributes Lch and Rch and combines them simply in the
device of the present embodiment. Output. Although LSch and Rsch are voice inputs to the rear
speakers, they are fictitious channels in the apparatus of the present embodiment, and signal
processing is performed in the DSP 10 to synthesize Lch and Rch. Since it is not always practical
to prepare an output system of 5ch of amplifiers and speakers, the apparatus of this embodiment
uses the above-mentioned head-related transfer function to create the acoustic effect of the
output from the rear, and an imaginary output. Make up the lineage. The DIR 23 can input digital
time-series audio data of a bit stream. The A / D converter 21 can convert an analog signal, for
example, an audio signal input from a microphone, into digital time series data, and sends the
data to the decoder 14. The HDMI 23 (High-Definition Multimedia Interface) receives audio and
control signals together. The DSP 10 includes a post-processing DSP 13 and a decoder 14. The
DSP 10 processes the digital time series data input from the above-mentioned input part and
sends it to the D / A converter 22. The D / A converter 22 converts the data generated by the
DSP 10 into an analog signal. The analog signal is converted into sound by the speakers LS and
RS via the electronic volume 41 for adjusting the volume and the power amplifier.
[0016]
The power amplifier 42 may be a so-called digital amplifier that amplifies the digital amplitude
before converting it to a D / A converter and then removes a high frequency to obtain an analog
signal.
[0017]
The sound image localization apparatus also includes a controller 32 that controls the above
configuration, a memory 31 that stores control data of the controller 32, and a user interface 33
08-05-2019
6
that instructs the controller 32.
The memory 31 stores model head transfer functions, which will be described later with
reference to FIGS. 2 and 3, as a data table that simulates space propagation from the direction in
which the speakers are present to each ear. This model head-related transfer function is a space
transfer function from a predetermined direction to the ear, and it is known that a database has
already been made. This can be used to create an acoustic effect as if the sound from behind was
being emitted.
[0018]
Next, the DSP 10 will be described in more detail with reference to FIG. The DSP 10 includes a
decoder 14 and a DSP 13 for post processing. Each will be described below. The decoder 14
decodes the digital time-series data input from the DIR 23 and the A / D converter 21 and the
HDMI 24 which are the input parts described above, and sends it to the post-processing DSP 13.
The decoder 14 itself can handle 5 channels of audio data as this digital time-series data as
described above. That is, the 5ch is a digital voice input to speakers of Lch (front left), Rch (front
right), Cch (front center), LSch (rear left), RSch (rear right). The post-processing DSP 13 performs
signal processing on these 5 channels of audio data, mixes them down into 2 channels of data,
and outputs the resultant as pseudo 5 channels.
[0019]
In order to perform this mixdown, in the system of this embodiment, Cch is first distributed to
Lch and Rch as shown in FIG. 1, and adders 135A and 135B are added to these Lch and Rch
signals. When mixing down in this way, LSch (rear left) and RSch (rear right) need to be virtually
audible from the rear, so add rear localization 131 and crosstalk cancellation correction circuit
133. Have. Then, as shown in FIG. 1, data of LSch (rear left) and RSch (rear right) are processed
and added to Lch and Rch.
[0020]
In the rear localization addition 131 as shown in FIG. 1, as described above, a pseudo effect is
produced as if it can be heard from behind. The method will be described below. Here, for ease of
08-05-2019
7
explanation, it is assumed that the LS rear virtual speaker LSV and the RS rear virtual speaker
RSV actually exist, and the sound itself of LSch and RSch is emitted from the speakers LSV and
RSV. Assuming this, the voice of LSch enters the left ear M1 through the rear direct direction
102D and is transmitted to the right ear M2 through the rear cross direction 102C. In order to
simulate this space transfer, the head transfer functions of the paths 102D and 102C are
respectively used in the filter 131 LD and the filter 131 LC, respectively (hereinafter, the head
transfer function simulating the space transfer is referred to as “model head It is called a
transfer function. " The “model head transfer function” corresponds to a simulation of the
above-mentioned real head transfer function. ). The LSch has been described above, but the RSch
voice also has line symmetry with respect to the line of the face direction 103 of the listener (the
positional relationship may not be line symmetry. And the same explanation.
[0021]
Here, the filter functions of the rear localization addition 131 of FIG. 1 can be summarized as
follows. The filter 131LD uses a model head-related transfer function from the LS rear virtual
speaker LSV to the left ear M1. The filter 131 LC uses a model head-related transfer function
from the LS rear virtual speaker LSV to the right ear M2. The filter 131 RD uses a model headrelated transfer function from the RS rear virtual speaker RSV to the right ear M2. The filter 131
RC uses a model head-related transfer function from the RS rear virtual speaker RSV to the left
ear M1. Then, in the rear localization addition 131 of FIG. 1, these filters are folded into LSch and
RSch to add the acoustic characteristics of the rear virtual speakers LSV and RSV.
[0022]
Next, the crosstalk cancellation correction circuit 133 of FIG. 1 will be described. The purpose of
the correction circuit 133 is to deliver the characteristics of the model head transfer function
configured by the rear localization addition 131 to both ears. If you listen to the sound of the LS
rear localization calculators 131L and 131R with ideal headphones, you can do this (however,
headphones do not necessarily have such characteristics because they have many peaks and dips
themselves) It does not become. However, in the apparatus of this embodiment using the
loudspeakers, since the sound is heard from the front speakers RS and LS, the sound
transmission from the front speakers RS and LS to the two ears is distorted by the space
transmission from the front speakers RS and LS. As a result, there is a possibility that the abovedescribed effect of the LS rear localization addition can not be exhibited sufficiently. Therefore,
the sound source is output from a real speaker that exists before so that the output of the LS rear
localization calculation unit 131 L is put into the left ear only and the output of the RS rear
08-05-2019
8
localization calculation unit 131 R into the right ear in a pseudo manner. Process the
[0023]
The crosstalk cancellation correction circuit 133 in FIG. 1 uses a head-related transfer function
that simulates or experimentally measures the space transfer from the previous speakers RS and
LS to both ears. This head transfer function also corresponds to the above-mentioned "model
head transfer function" as in the case of the above-mentioned rear localization addition 131
(however, the correction circuit 133 mainly simulates the sound propagating to the ear from the
front real speaker) The above-mentioned rear localization addition 131 is different from the one
simulating the propagation from the rear or left and right direction in that the above-mentioned
rear localization addition 131 is used. Here, this head-related transfer function is a function
having a relationship of frequency [Hz] to gain [dB] as shown in FIGS. 2 (A) and 2 (B) described
later. This model head-related transfer function is stored as a data table in the memory 31 of FIG.
1 as described above. The controller 32 selects appropriate model HRTFs from the data table
stored in the memory 31 of FIG. 1 for four ways of (speakers LS, RS) and (left ear, right ear).
Specifically, the following functions are selected and defined as follows for the convenience of
explanation. That is, the transfer function of the path of (Lch speaker LS → left ear) is the
transfer function of the path of LD (Z), (Lch speaker LS → right ear) the path of LC (Z), (Rch
speaker RS → left ear) The transfer function of R (Z), the transfer function of the path of (Rch
speaker RS → right ear) is RD (Z), (Z is converted in discrete regions, respectively). Z represents
delay. Hereinafter, “(Z)” is omitted. )とする。 If defined in this way, the filter functions of Lch
direct correction 133LD, Lch cross correction 133LC, Rch cross correction 133RC, Rch direct
correction 133RD, transfer functions LD, LC, RC, and RD are obtained by calculation as follows.
Be In the following calculation, the PEQ 134 is ignored (the details of the PEQ 134 will be
described in FIG. 3 and later).
[0024]
First, since the sound heard by both ears simulates the sound field of the rear virtual speakers
LSV and RSV in the rear as shown in FIG. 1, the output itself of the rear localization calculation
unit 131 is transmitted to both ears. It is necessary to form a sound field.
[0025]
Note that “表 す” represents that the voice on the left side becomes equivalent if converted to
an electrical signal by a microphone or the like (the same applies hereinafter).
08-05-2019
9
[0026]
Next, these components transmitted to the ear from behind are distorted by the head related
transfer function from the front speakers by the acoustic environment around the head, and the
outputs of the adders 135C and 135D are deformed as described above. The transfer functions
LD, LC, RC, RD are considered to be transmitted as follows.
[0027]
[0028]
This is because speech can be calculated by superposition.
[0029]
Therefore, the audio signals to be output by the adders 135C and 135D of FIG. 1 are as follows.
As described above, the PEQ 134 is ignored (the details of the PEQ 134 will be described in FIG.
3 and later).
[0030]
[0031]
From the above description, the digital data to be generated by the adder 135C and the adder
135D of FIG. 1 are digital data corresponding to the component of the above-mentioned virtual
rear speaker of the voice obtained by this equation.
Therefore, the transfer function of the crosstalk cancellation correction circuit 133 is Lch direct
correction as RD / (RD × LD−RC × LC), Lch cross correction as LC / (RD × LD−RC × LC), Rch
Cross correction is RC / (RD × LD−RC × LC), Rch direct correction is LD / (RD × LD−RC ×
LC).
08-05-2019
10
Note that "x" represents convolution, and data obtained by convoluting Lch cross correction
133LC and Rch cross correction RC are respectively multiplied by -1 in an adder 135C and
added.
[0032]
As described above, the digital voice input passed through the crosstalk cancellation circuit 133
and the adders 135C and 135D of FIG. 1 is added to the data of Lch and Rch by the adders 135A
and 135B.
Then, the added data is output to the D / A converter 22 as data of 2ch, and is converted into
sound by the speakers LS and RS via the electronic volume 41 and the power amplifier.
[0033]
In addition, the calculation of the crosstalk cancellation correction shown in the description of
the above-mentioned FIG. 1 actually has many taps of time delay, and the calculation may be
difficult.
Therefore, as an approximation of the practical range, the influence of the cross direction is
canceled by adding the inverse function of the head transfer function in the cross direction from
the direct direction side (see, for example, Patent Document 1).
[0034]
Next, an operation concept of the PEQ 134 will be described with reference to FIGS.
First, the crosstalk cancellation filter will be specifically described with reference to FIG. FIG. 2 is
a gain diagram of the crosstalk cancellation filter. FIG. 2A shows a model head-related transfer
function in the case where the Lch speaker LS is in the horizontal direction in a direction in
which the azimuth is turned 30 degrees to the left from the direction 103 of the listener's face in
FIG. FIG. 2 (B) similarly shows a model head-related transfer function in the case where the Rch
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11
speaker RS is in the horizontal direction with the direction turned 30 degrees to the right from
the direction 103 of the listener's face in FIG. ing. Further, G1 in FIG. 2A and G1 ′ in FIG. 2B
represent a model head transfer function in the direct direction, and G2 in FIG. 2A and G2 ′ in
FIG. , Represents the cross-direction model head transfer function. As shown in FIGS. 2A and 2B,
the model head transfer functions G2 and G2 'in the cross direction have smaller gains than
those in the direct direction G1 and G1'. This is considered to be due to the decrease in gain due
to the difference in propagation distance due to the difference in the position of both ears, the
diffraction by the face, and the like.
[0035]
As shown in FIGS. 2 (A) and 2 (B), the left and right head related transfer functions are
substantially line symmetrical for the description of the direction 103 of the listener's face (the
positional relationship is not line symmetrical. Because it is similar, in the following description,
the Lch head transfer function will be used as an explanation.
[0036]
Graphs G3 and G4 shown in FIG. 2C are filters used for crosstalk cancellation, G3 corresponds to
the correction circuit 133LD of FIG. 1, and G4 corresponds to the correction circuit 133RC of
FIG.
As shown in FIGS. 2 (A) and 2 (C), G1 in FIG. 2 (A) and G3 in FIG. 2 (C) are in a substantially
inverse filter relationship. Therefore, dip D1 shown in FIG. 2 (A) of model head transfer function
LD of left ch → left ear M1 shown in FIG. 1 (A) is projected as peak P1 of FIG. 2 (C) to these
filters. ing. Further, as shown in FIG. 2C, a similar peak P2 is present in the graph of G4.
[0037]
Although the transfer function of the correction circuit 133LD is a substantially inverse filter of
the model head transfer function LD as described above, the function of canceling the frequency
characteristic in the direct direction instead of the crosstalk described above. This also
corresponds to "cancellation of the transfer characteristic of the space propagation path from the
speaker to the listener's ear" in the present invention.
[0038]
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12
Here, the influence of the head-related transfer function shown in FIG. 2A on the audibility will
be described.
It is said that 1 kHz or less of the frequency [Hz] of the head related transfer function is
perceived as a phase difference, and 1 kHz to 7 kHz of the frequency [Hz] is perceived as gain
and loudness. In these areas, there is little individual difference in the head related transfer
functions. However, at 7 kHz or more, since the shape of the face is different among individuals,
the head-related transfer function is different in dip frequency and shape caused by interference
of voice due to the shape of face (see D1 and D2 in FIG. 2A). ). Thus, the crosstalk cancellation
filters G3 and G4 differ among individuals. Therefore, even if filters for these crosstalk
cancellations are constructed in theory using a model head transfer function, the effect may not
be sufficient, and this peak may make the auditory sense of discomfort. In the apparatus of the
present embodiment, adjustment corresponding to such individual difference is performed as
described below using the PEQ 134 of FIG.
[0039]
Next, referring to FIG. 3, the PEQ 134 of the apparatus of this embodiment (see FIG. 1). Will be
described. FIG. 3 is an operation conceptual diagram of the PEQ 134. Although not shown, the
PEQ 134 in FIG. 1 is divided into two stages. The first filter is a filter for removing the peak of the
filter of the correction circuit 133 as shown by P3 and P4 in FIG. 3A, and more specifically, is a
filter for smoothing a band of 9 kHz or more. Thus, the first filter is connected in series to
eliminate the sense of discomfort in hearing. However, as in the case of Patent Document 2, when
this peak is removed, the localization is not properly determined, and so to speak, a sense of
blurring is heard on hearing. Therefore, in the PEQ 134, as shown in FIG. 3B, the signal
processing is performed by providing a second filter for adding the peaks P5 and P6 again. This
addition does not merely restore the peak, but is performed using the adjustment means
described in the description of FIG. 4 below.
[0040]
As an actual implementation form, as shown in FIG. 1, the crosstalk cancellation correction
circuit 133 and the first filter for removing peaks as described in FIG. 3A are separately provided
to perform signal processing. It is desirable from the viewpoint of calculation and simplification
of the device that it is not necessary to calculate at the time but to calculate these together
08-05-2019
13
beforehand and store them as filter coefficients in the memory 31 or an external storage device
(not shown) at the time of factory shipment. For example, the filter coefficients of the crosstalk
cancellation correction circuit 133 described using the above-mentioned equation are
predetermined directions of the speaker and the face of the listener 103 (see the right part of
FIG. 1) at the time of factory shipment of the device of this embodiment. Assuming that the angle
with), prepare one or more patterns, and prepare a filter of the frequency characteristic with the
frequency of 9 kHz or more flattened as shown in Fig. 3 (A) as a filter coefficient. Can be On the
other hand, since the adjustment as shown in FIG. 3B needs to be adjusted to the listener, it can
not be prepared in advance at the time of shipment from the factory. As an actual
implementation form, the PEQ 134 is shown in FIG. It becomes an equalizer which performs
signal processing which adds a peak as shown in.
[0041]
Next, with reference to FIG. 4, a method of adjusting the peak added again as shown in FIG. 3B in
the apparatus of the apparatus of the present embodiment will be described. FIG. 4 is a
conceptual diagram showing how to adjust when such a peak is added. As described above,
simply adding a peak as shown in FIG. 3 (B) is not suitable for individual differences and results
in tiredness, so the apparatus of the present embodiment is provided with an adjusting device to
cope with such individual differences. Make adjustments. FIG. 4A is a conceptual diagram for
adjusting the center frequency of the peak portion. As shown in this figure, the peak P moves the
peak in the direction of the double arrow as shown by the shape of a broken line to adjust the
frequency. This frequency is set around 7 k to 10 kHz, and the frequency of this peak is adjusted
by 20% up and down. FIG. 4B is a conceptual view showing a method of adjusting the gain of the
peak portion. As shown in this figure, the peak P is moved in the direction of the double arrow,
that is, in the form of a broken line, and the gain of the peak portion is adjusted. FIG. 4C is a
conceptual diagram showing a method of adjusting the width of the peak portion or the Q value.
The shape of the peak portion is adjusted by varying the width of the peak P as shown in the
figure in the direction of the double arrow, ie, in the form of a broken line. The Q value is the
width of the peak shape at which the gain is lowered by 3 dB from the peak of the frequency of
peak P, and this width is represented by the ratio of frequencies.
[0042]
FIG. 4D is an embodiment of the adjustment panel for performing the adjustment shown in FIGS.
4A to 4C. A frequency adjustment knob 51, a gain adjustment knob 52, and a Q value adjustment
knob 53 are provided. These are circular rotary knobs, and the listener can adjust crosstalk
08-05-2019
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cancellation in the directions shown in FIGS. 4A to 4C by rotating the knob. This adjustment
panel requires four devices for performing such adjustment in accordance with the four
adjustments of the PEQ 134 as shown in FIG. However, it is also possible to omit this adjustment
into two, 134 LD = 134 RD and 134 LC = 134 RC, with the speaker arrangement being
symmetrical.
[0043]
However, as described with reference to FIG. 2, since the peak P shown in FIG. 4 is largely
attributable to the head-related transfer function in the direct direction, the adjustment of the
frequency adjustment knob 51 in FIG. Thus, the left and right ch may be simplified to two.
Furthermore, the arrangement of the speakers can be symmetrical and the adjustment of the
frequency adjustment knob 51 can be one. Further, this frequency is considered to be due to the
interference of voice due to the shape of the face and the reach difference between both ears,
and in the case of a listener with a narrow face, the reach difference is small and the peak
frequency is large. Therefore, instead of the frequency, the width of the face may be displayed on
the knob.
[0044]
In addition, the matters described as outline at the beginning of the description of “the best
mode for carrying out the invention”, the numerical values shown by the device of the present
embodiment, and the shape of the adjustment panel 5 shown in FIG. Does not limit the present
invention, and other configurations may be possible.
[0045]
The configuration of the sound image localization apparatus according to the present
embodiment will be described.
The gain diagram of the filter of the crosstalk cancellation of the sound image localization
apparatus which concerns on this embodiment is shown. The conceptual diagram about filter
PEQ added to the filter of the crosstalk cancellation of the sound image localization apparatus
which concerns on this embodiment is shown. The figure showing the adjustment method of the
filter of the crosstalk cancellation of the sound image localization apparatus which concerns on
this embodiment is shown.
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Explanation of sign
[0046]
10-DSP 13-DSP for post processing 131-rear localization addition 131 LD-filter 131 LC-filter
131 RC-filter 131 RD-filter 131 L-LS rear localization calculation unit 131 R-RS rear localization
calculation unit 133-crosstalk cancellation correction circuit 133 LD-Lch Direct correction
133LC-Lch cross correction 133RC-Rch cross correction 133 RD-Rch direct correction 134-PEQ
134LD-PEQ 134 LC-PEQ 134 RC-PEQ 134 RD-PEQ 135A-Adder 135B-Adder 135C-Adder 135DAdder 14- Decoder 21-A / D converter 22-D / A converter 23-DIR 24-HDMI 31-memory 32controller 33-user interface 4 1-electronic volume 42-power amplifier 5- adjustment panel 51frequency adjustment knob 52-gain adjustment knob 53-Q value adjustment knob 100-listener
(dummy head) 101D-front direct direction 101C-front cross direction 102D-rear direct Direction
102C-back cross direction 103-listener's face direction LS-Lch speaker RS-Rch speaker LSV-LS
rear virtual speaker RSV-RS rear virtual speaker P-peak P1-P6-peak D1-dip M1-left ear
08-05-2019
16
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