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JP2008294620

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DESCRIPTION JP2008294620
The present invention provides a sound field correction device capable of improving
transmission frequency characteristics at any of a plurality of listening positions in a room. In a
measurement mode, a karaoke apparatus 1 picks up test sounds at a plurality of places such as a
seat where a user sits and a position where a singer sings, and temporarily stores measurement
data of a plurality of test sound signals in a memory. When the collection of the test sound is
completed, measurement data of transmission frequency characteristics at all listening positions
are read out from the memory, and a plurality of weighted average data weighted according to
the collection place are created. Then, the equalization processing unit 12 is adjusted to create
correction data for correcting the weighted average transmission frequency characteristic data
into desired transmission frequency characteristic data set in advance. Also, at the start of the
normal mode, the user operates the operation unit 9 to set the listening position where the user
sits, reads the correction data, improves the transmission frequency characteristics at each
listening position, and averages or partially The transmission frequency characteristic of the
listening position of [Selected figure] Figure 1
Sound field correction device
[0001]
The present invention relates to a sound field correction apparatus that measures transmission
frequency characteristics of a place where a user is present and corrects the transmission
frequency characteristics to a desired transmission frequency characteristic.
[0002]
08-05-2019
1
For a karaoke shop, a room (also referred to as a karaoke box) of an optimal size according to the
number of users.
In order to be able to provide), several rooms of different sizes are generally provided. In each
room, a microphone used by the singer, a karaoke apparatus for mixing voices collected by the
microphone and musical tones of karaoke performance, a speaker for emitting voices mixed by
the karaoke apparatus, and an image output from the karaoke apparatus Monitors to be
displayed and equipment such as chairs and tables used by the user are arranged in accordance
with the size and shape.
[0003]
As described above, when the size, shape, and arrangement of fixtures are different in each room,
the transmission frequency characteristics are different, so that the transmission frequency
characteristics are not preferred by the user, or a closed loop of sound transmission is formed,
and a specific frequency band The signal level of the signal may become extremely high and
howling may occur. In addition, the position at which the user is seated or the position at which
the user sings (also referred to as a listening position). Because the transmission frequency
characteristics differ depending on), depending on the position, it may not sound so good.
[0004]
In order to solve these problems, conventionally, an equalizer is provided in the karaoke
apparatus or the like, and the transmission frequency characteristic is corrected by the equalizer.
For example, the howling prevention device that sets the equalizer to attenuate the signal level in
the transmission frequency band where howling occurs, or correction of the sound
characteristics is performed by the operator so that the characteristics after correction do not
become extreme. There have been sound field correction devices that set the correction level and
the correction frequency band appropriately (see, for example, Patent Documents 1 and 2). JP-A8-84394 JP-A-7-38988
[0005]
However, conventional devices have not been able to improve the transmission frequency
characteristics at any listening position, or additionally improve the transmission frequency
08-05-2019
2
characteristics of some listening positions.
[0006]
Therefore, an object of the present invention is to provide a sound field correction device capable
of improving transmission frequency characteristics at any of a plurality of listening positions in
a room.
[0007]
The present invention has the following configuration as means for solving the above-mentioned
problems.
[0008]
(1) Test sound source means for generating a test sound signal, a speaker for emitting a test
sound based on the test sound signal, a microphone for collecting the test sound to generate a
test sound collection signal, the test Characteristic measurement means for dividing a collected
signal into a plurality of partial frequency band components and measuring transmission
frequency characteristics of each partial frequency band component, Storage means for storing
measurement data of transmission frequency characteristics of the respective partial frequency
band components, Equalizing means for dividing the audio signal output to the speaker into a
plurality of partial frequency band components and correcting the transmission frequency
characteristics of each partial frequency band component; each test generated from the test
sound collected by the microphone at a plurality of locations Measurement data of transmission
frequency characteristics of the partial frequency band component of the collected sound signal
is read out from the storage means, and weighted averaging is performed, Control data for
correcting transmission frequency characteristics of each weighted partial frequency band
component to the desired transmission frequency characteristics, and controlling the equalizing
means to correct the transmission frequency characteristics based on the correction data And
means.
[0009]
In this configuration, the sound field correction device emits from the speaker a test sound based
on the test sound signal generated by the test sound source means, and the test sound is
collected by the microphone at a plurality of places to generate a test sound pickup signal.
Generate
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3
Then, each test sound pickup signal is divided into a plurality of partial frequency band
components, the transmission frequency characteristics of each partial frequency band
component are measured, and these measurement data are stored in the storage means.
Further, in the sound field correction device, the control means reads out the measurement data
of the transmission frequency characteristics of the partial frequency band component from each
of the storage means for each of the test collected signals generated and collected at a plurality
of places. Correction data for correcting the transmission frequency characteristic of each
weighted partial frequency band component to a desired transmission frequency characteristic is
created, and the transmission frequency characteristic is corrected by the equalizing means
based on the correction data.
Therefore, the transmission frequency characteristic of each place can be improved on average,
without the transmission frequency characteristic being very good and the other places being
bad only at some of the conventionally adjusted places.
[0010]
(2) The control means equalizes the weight of each of the test collected signals collected at the
plurality of places and performs weighted averaging.
[0011]
In this configuration, the weights of the test collected signals collected at a plurality of places are
equalized and weighted and the transmission frequency characteristics of the partial frequency
band components are corrected to the desired transmission frequency characteristics.
Therefore, the transmission frequency characteristics at each location can be improved on
average.
[0012]
(3) The control means is characterized in that the weight of the test sound pickup signal picked
up at a specific place among the test sound pickup signals picked up at the plurality of places is
increased to perform weighted averaging.
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4
[0013]
In this configuration, of the test collected signals collected at a plurality of places, the weight of
the test collected signal collected at a specific place is increased and weighted averaging is
performed, and the transmission frequency characteristic of each partial frequency band
component is obtained. To the desired transmission frequency characteristic.
Therefore, the transmission frequency characteristics of each location can be generally improved,
and the transmission frequency characteristics of a particular location can be made better than
other locations.
By this, it is possible to particularly improve the transmission frequency characteristics of a place
frequently used by the user and a place usually used. For example, when the sound field
correction apparatus is applied to a karaoke apparatus, the transmission frequency of the seat is
measured by measuring the positions of a plurality of seats and the singing position in front of
the monitor and increasing the weight of the singing position in front of the monitor. Along with
improving the characteristics, the transmission frequency characteristics of the singing position
can be made the best.
[0014]
(4) The control means is characterized in that, as the plurality of places, each test sound pickup
signal picked up at a specific number of places is subjected to weighted averaging.
[0015]
In this configuration, measurement data of transmission frequency characteristics of each partial
frequency band component is read out from the storage means and weighted average is obtained
for each of the test collected signals collected at a specific number of places as a plurality of
places.
Therefore, measurement can be speeded up by limiting the place where the test sound is picked
up to a specific number of places. For example, when the sound field correction apparatus is
08-05-2019
5
applied to a karaoke apparatus, even if there are five or more seats around the table, the
measurement location is the four corners around the table, the two seats forming the diagonal of
the table, Alternatively, measurement can be speeded up by limiting to two seats etc. often used
when singing in a duet like two adjacent seats in front of the monitor. In addition, the
transmission frequency characteristic obtained by weighted averaging the measurement data
obtained by measuring the transmission frequency characteristics at a specific number of places
as described above and the transmission frequency characteristic obtained by weighted
averaging the measurement data obtained by measuring the transmission frequency
characteristics at all seats are similar. Because of the characteristics, it is possible to correct the
transmission frequency characteristics without problems even if the number of measurement
points is reduced.
[0016]
(5) Test sound source means for generating a test sound signal, a speaker for emitting a test
sound based on the test sound signal, and a plurality of microphones for collecting the test sound
to generate a test sound collection signal Mixing means for mixing each of the test collected
signals collected by the plurality of microphones to generate a test mixing signal; dividing the
test mixing signal into a plurality of partial frequency band components; and signal levels of the
respective partial frequency band components Characteristic measurement means for detecting,
Equalizing means for dividing an audio signal to be output to the speaker into a plurality of
partial frequency band components and correcting transmission frequency characteristics of
each partial frequency band component, Each partial frequency band component of the test
mixing signal Correction data to correct the transmission frequency characteristic of the signal to
the desired transmission frequency characteristic, and It said equalizing means is characterized
by comprising a controller that controls so as to correct the transmission frequency
characteristic based on.
[0017]
In this configuration, the sound field correction device emits from the speaker a test sound based
on the test sound signal generated by the test sound source means, and the test sound is
collected by a plurality of microphones at a plurality of places, and the mixing means To generate
the test mixing signal mixed by.
Then, the test mixing signal is divided into a plurality of partial frequency band components, and
the transmission frequency characteristics of each partial frequency band component are
measured. Further, in the sound field correction device, the control means creates correction data
08-05-2019
6
for correcting the transmission frequency characteristics of each partial frequency band
component of the test mixing signal to a desired transmission frequency characteristic, and the
equalizing means is based on the correction data. To correct the transmission frequency
characteristics. Therefore, since the test sound pickup signals collected by the plurality of
microphones are mixed by the mixing means, it is not necessary to perform the weighted average
processing, and the processing can be speeded up.
[0018]
(6) Operation means for receiving an input for selecting a specific place, Correction data storage
means for storing a plurality of correction data created by the control means, The control means
is an input received by the operation means To increase the weight of a specific place and read
weighted average data from the correction data storage means, and control the equalizing means
to correct the transmission frequency characteristic based on the correction data. It features.
[0019]
In this configuration, the control means reads out the weighted average correction data from the
storage means by increasing the weight of the specific place based on the input for selecting the
specific place received by the operation means. The equalizing means corrects the transmission
frequency characteristic based on the data.
Therefore, in the sound field correction apparatus, when the sound field correction is performed,
it is possible to set the transmission frequency characteristic of the specific place to be
particularly improved by operating the operation means and selecting the specific place.
[0020]
(7) Correction data storage means for storing a plurality of correction data created by the control
means, Sound source means for generating a measurement sound signal, The speaker has two
speakers for emitting measurement sound The control means causes the sound source means to
generate a measurement sound signal, and after the two speakers emit a measurement sound
based on the measurement sound signal, each measurement sound is collected by the
microphone. The position of the microphone is calculated based on the time of t, correction data
corresponding to the calculated position information of the microphone is read out from the
correction data storage means, and the equalizing means corrects the transmission frequency
characteristic based on the correction data. Control to be performed.
08-05-2019
7
[0021]
In this configuration, the control means of the sound field correction apparatus causes the sound
source means to generate the measurement sound signal and causes the two speakers to emit the
measurement sound.
Then, the position of the microphone is calculated based on the time from when the two speakers
emit the measurement sound to when the microphone picks up each measurement sound, and
the correction data according to the calculated position information of the microphone Are read
out from the correction data storage means, and the transmission frequency characteristic is
corrected by the equalizing means based on the correction data. Therefore, the sound field
correction apparatus calculates the position of the microphone and reads correction data that
particularly improves the transmission frequency characteristic of the position of the
microphone, thereby adjusting the transmission frequency characteristic by the equalizing means
and using the microphone In particular, it is possible to improve the transmission frequency
characteristic of the position where the person is present.
[0022]
According to the present invention, transmission frequency characteristics can be improved at
any of a plurality of listening positions in a room.
[0023]
First, a sound field correction apparatus according to an embodiment of the present invention
will be described with reference to the drawings.
In the following description, the case where a sound field correction apparatus is applied to the
karaoke apparatus used by a karaoke box etc. is mentioned as an example, and is demonstrated.
FIG. 1 is a block diagram showing the configuration of the karaoke apparatus, where (A) shows
the configuration in the measurement mode, and (B) shows the configuration in the normal
mode. In FIG. 1, parts not used in each mode are indicated by dotted lines. FIG. 2A is a block
diagram showing the configuration of the characteristic measurement unit, and FIG. 2B is a
diagram showing the concept of frequency band division. FIG. 3 is a transmission frequency
characteristic diagram for explaining the correction method and concept of the transmission
08-05-2019
8
frequency characteristic. In the figure, (A) shows the normalized transmission frequency
characteristic 250 of the collected signal when the white noise is emitted from the speakers 15L
and 15R and collected by the microphone 16, and (B) shows the transmission of the collected
signal. The concept of peak and dip based on the frequency characteristic 250 and the desired
transmission frequency characteristic 260 set in advance is shown, and (C) is a sound collection
signal after correction processing in the equalizing processing unit 12 (a sound collection signal
after transmission frequency characteristic correction ) And the desired transmission frequency
characteristic 260. Further, FIG. 3 shows the case where the peak 272 and the dip 271 to be
corrected exist in the region of the determination target frequency band FB. FIG. 4 is a block
diagram showing the configuration of the equalizing processing unit.
[0024]
As shown in FIG. 1A, the karaoke apparatus 1 includes an operation unit 9, a memory 10, a CPU
11, an equalizing processing unit 12, a D / A converter 13, power amplifiers 14L and 14R,
speakers 15L and 15R, a microphone 16, and an echo. A processing unit 17, an A / D converter
18, a mixer 19, a sound source 20, a test sound source 21, and a characteristic measurement
unit 22 are provided.
[0025]
In the measurement mode, the karaoke apparatus 1 performs a plurality of places (hereinafter
referred to as “listening” such as a seat for a user sitting around the karaoke apparatus 1 or a
stage where a singer sings in order to correct transmission frequency characteristics of a
plurality of listening positions. Also called position.
The test sound is picked up in step b), and measurement data of a plurality of test sound signals
are temporarily stored in a memory. Then, when the collection of the test sound is completed, the
measurement data of the transmission frequency characteristics at all listening positions are read
out from the memory, and a plurality of weighted average data (weighted average transmission
frequency characteristics data) weighted according to the collection location are created. Do.
Then, the karaoke apparatus 1 adjusts the equalizing processing unit 12 to create correction data
for correcting the weighted-averaged transmission frequency characteristic data into desired
transmission frequency characteristic data set in advance.
[0026]
In the measurement mode, the karaoke apparatus 1 performs the above-described process using
08-05-2019
9
the echo processing unit 17, the mixer 19, and the units other than the sound source 20.
[0027]
Specifically, when detecting that the operation unit 9 receives the start input of the measurement
mode, the CPU 11 outputs a control signal instructing the test sound source 21 to start
generating the test sound signal.
[0028]
When the test sound source 21 detects this control signal, the test sound source 21 generates a
test sound signal for measuring a transmission frequency characteristic which is previously set
or designated by the CPU 11.
As the test sound signal, for example, a sound signal including the entire audio frequency band
such as a white noise signal or a pink noise signal is suitable.
[0029]
The D / A converter 13 converts the digital test sound signal output from the test sound source
21 into an analog test sound signal, and outputs the test sound signal to the power amplifiers
14L and 14R.
[0030]
The power amplifiers 14L and 14R amplify the test sound signal at an amplification factor which
is set in advance or designated by the CPU 11, and respectively output to the speakers 15L and
15R.
[0031]
The speakers 15L and 15R emit the test sound based on the test sound signal into the room of
the room where the transmission frequency characteristic is to be measured.
For example, when measuring the transmission frequency characteristic of a karaoke box, a test
08-05-2019
10
sound based on a test sound signal is emitted from a speaker installed in the karaoke box.
[0032]
Microphone (hereinafter, simply referred to as a microphone.
) 16 is installed in one of a plurality of places (seats and singing positions) in the same room as
the speakers 15L and 15R for improving transmission frequency characteristics.
For example, it is installed in the seat in front of the monitor installed in the karaoke box. The
microphone 16 picks up the test sound emitted from the speakers 15L and 15R to generate a
test sound pickup signal, and outputs the test sound pickup signal to the echo processing unit
17.
[0033]
The echo processing unit 17 outputs a test sound pickup signal to the A / D converter 18 without
performing echo processing at the time of measurement.
[0034]
The A / D converter 18 converts the test sound pickup signal from analog form to digital form
and outputs it to the characteristic measurement unit 22.
[0035]
As shown in FIG. 2B, the characteristic measurement unit 22 divides the measurement frequency
range FZ set in advance by a predetermined number m with respect to the test sound pickup
signal, and the signal levels of the partial frequency bands FB1 to FBm. Is detected and output to
the CPU 11.
Specifically, in the partial frequency bands FB1 to FBm, for example, m measurement frequency
ranges FZ corresponding to the frequency bands to be measured set in advance from the speaker
characteristics, the microphone characteristics, etc. The divided bands are set to FB1, FB2,... FBm
08-05-2019
11
in order from the low band side.
[0036]
As shown in FIG. 2A, the characteristic measurement unit 22 is referred to as a band pass filter
(hereinafter, referred to as a BPF) for the number m of partial frequency bands.
221 to 22 m and signal level detection units 231 to 23 m for detecting signal levels in respective
partial frequency bands. The BPFs corresponding to the partial frequency bands and the signal
level detection unit are connected in series to form a series circuit, and m series circuits
corresponding to the partial frequency bands are connected in parallel. For example, the FB1
band BPF 221 corresponding to the first partial frequency band FB1 and the FB1 signal level
detection unit 231 are connected in series to form an FB1 signal detection series circuit.
Similarly, the FB2 band BPF 222 corresponding to the second partial frequency band FB2 and
the FB2 signal level detection unit 232 are connected in series to form an FB2 signal detection
series circuit. Similarly, a series circuit corresponding to each partial frequency band is formed,
an FBm band BPF 22m corresponding to the mth partial frequency band FBm and an FBm signal
level detection unit 23m are connected in series, and an FBm signal detection series circuit It is
formed. The FBm signal detection series circuit group is connected in parallel between the A / D
converter 18 and the CPU 11.
[0037]
When the test sound pickup signal output from the A / D converter 18 is input, the BPF 221 to
22 m outputs a signal of a set frequency band component. That is, the BPFs 221 to 22m
decompose the test collected signal output from the A / D converter 18 into m partial frequency
band components.
[0038]
The signal level detection units 231 to 23 m detect the signal levels of the partial frequency band
component signals output from the BPFs 221 to 22 m, respectively, and output the level values
to the CPU 11 together with partial frequency band information.
[0039]
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12
In addition, the characteristic measurement unit 22 includes a full band signal level detection
unit 230 that detects the signal level in the measurement frequency range FZ.
The all band level detection unit 230 is connected in parallel to the FBm signal detection series
circuit group, detects the signal level of the test sound pickup signal output from the A / D
converter 18, and sends it to the CPU 11 as an original signal level value. Output.
[0040]
In the measurement mode, the CPU 11 temporarily stores the level value of each partial
frequency band component signal output from the characteristic measurement unit 22 together
with partial frequency band information in the memory 10 in order to correct transmission
frequency characteristics of a plurality of listening positions. Let Further, the CPU 11 temporarily
stores the original signal level value in the memory 10. Then, the CPU 11 repeats the abovedescribed process until the number of times set by the operator operating the operation unit 9 or
until the operator inputs the end of the measurement.
[0041]
When the above process is completed, the CPU 11 reads out from the memory 10 the level value
of each partial frequency band component signal of all the test sound signals collected at
different places, and weights for each partial frequency band component according to the sound
collection location Add weighted averages.
[0042]
Further, the CPU 11 reads out each original signal level value of all the test sound signals
collected at different places from the memory 10, applies a weight according to the collection
place, and performs weighted averaging.
In addition, the detail of the method of the weighting according to the sound collection location is
mentioned later.
08-05-2019
13
[0043]
Subsequently, the CPU 11 normalizes the level values of the weighted-averaged partial frequency
band component signals with the weighted-averaged original signal level values. The CPU 11
calculates the level value of the normalized partial frequency band component signal (normalized
partial band signal level) and the normalized desired transmission frequency characteristic stored
in advance in the memory 10 into respective partial frequency bands. And detect peaks and dips
for desired transmission frequency characteristics. Here, the desired transmission frequency
characteristic is a target value of the transmission frequency characteristic set in advance so as
to be a good transmission frequency characteristic in the karaoke box. The peak indicates a
portion where the normalized subband signal level is higher than the desired transmission
frequency characteristic, and the dip indicates a portion where the normalized subband signal
level is lower than the desired transmission frequency characteristic. Specifically, the CPU 11
calculates a correction value for correcting these peaks and dips using a method described below.
[0044]
When the weighted average measurement data is the transmission frequency characteristic 250
as shown in FIG. 3A, the CPU 11 detects the peak 272 and the dip 271 with respect to the
desired transmission frequency characteristic 260 as shown in FIG. 3B. The peak 272 and the dip
271 are set in descending order of the level value. Then, the CPU 11 corrects the correction
value (the direction indicated by the arrow in FIG. 3B) at the same level as the difference value
between the peak 272 and the level of the desired transmission frequency characteristic of the
corresponding partial frequency band of the dip 271. Set the correction value of For example, for
the peak 272, a correction value of “−” is set as the correction of the suppression direction,
and for the dip 271, a correction value of “+” is set as the correction of the enhancement
direction. At this time, based on the sound emission characteristics of the speakers 15L and 15R
and the sound collection characteristics of the microphone 16, the CPU 11 sets a predetermined
frequency region on the high frequency side of the entire frequency band FZ where sound
collection or sound emission is not complete, and low frequency side. The calculation is not
performed for the predetermined frequency band of That is, the CPU 11 sets a frequency band in
which sound collection or sound emission is sufficient to the determination target frequency
band FB, and calculates a difference value and a difference direction in the determination target
frequency band FB. As a result, the correction value can be set without being influenced by the
sound emission characteristics of the speakers 15L and 15R and the sound collection
characteristics of the microphone 16. Although the case where both the sound emission
08-05-2019
14
characteristic of the speaker and the sound collection characteristic of the microphone have been
taken into consideration has been described, only one of them may be taken into consideration.
[0045]
The CPU 11 refers to each parametric equalizer (hereinafter referred to as PEQ) of the equalizing
processing unit 12 based on the calculated correction value. ) Set the correction parameters of
121 to 12 n. Thereby, as shown in FIG. 3C, the transmission frequency characteristic 251 which
is substantially similar to the desired transmission frequency characteristic in the judgment
target frequency band FB and similar to the desired transmission frequency characteristic in the
entire frequency range FZ is realized. be able to.
[0046]
The equalizing processing unit 12 is configured by multistage cascade connection of PEQs, and
in the example shown in FIG. 4, n PEQs 121 to 12 n are cascaded. Correction parameters are
given from the CPU 11 to each of the PEQs 121 to 12n, and equalization processing is performed
using these correction parameters. As a result, the transmission frequency characteristic of the
room in which the speakers 15L and 15R and the microphone 16 are installed can be set in the
equalizing processing unit 12 so as to correct the transmission frequency characteristic to a
desired transmission frequency characteristic and emit the sound.
[0047]
Here, although the equalizing processing unit 12 is configured by PEQs connected in cascade, an
analog equalizer or a graphic equalizer may be used.
[0048]
The CPU 11 stores the correction parameter for realizing the transmission frequency
characteristic 251 in the memory 10, reads the correction parameter from the memory 10
according to the setting in the normal mode, and controls the equalizing processing unit 12 to
obtain the speaker The voices emitted from 15L and 15R are corrected to have desired
transmission frequency characteristics.
[0049]
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15
Next, details of weighted averaging processing according to the listening position will be
described.
FIG. 5 is a top view showing the arrangement of equipment in the karaoke box, in which (A)
shows a room for 4 people and (B) shows a room for 8 people.
[0050]
As shown in FIG. 5A, in the karaoke box 101, a table 111 is installed at the center of the room,
and sofas 113A, 113B and a chair 113C are arranged along three sides around the table 111.
In addition, the karaoke apparatus 1, the speakers 15L and 15R, and the monitor 115 are
installed along the wall 101A at a position away from the other side of the table 111. The
karaoke box 101 has four seats (listening positions) for four people. The user can sit on the
listening position P1 of the sofa 113A, the listening positions P2 and P3 of the sofa 113B, or the
chair 113C (listening position P4).
[0051]
The measurement mode of the karaoke apparatus 1 is a mode in which the correction data of the
equalizing processing unit 12 is created so that the worker measures the transmission frequency
characteristic data of each listening position and performs weighted averaging to obtain the
desired transmission frequency characteristic. is there.
[0052]
The worker places the microphone head of the microphone 16 in the middle direction between
the speaker 15L and the speaker 15R so that the height of the user's ear is at each of the
positions P1 to P4 when installing the karaoke apparatus 1, etc. Install toward the
Then, the worker operates the operation unit 9 of the karaoke apparatus 1 to measure the
transmission frequency characteristic for each listening position in the above-mentioned
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16
processing procedure. When the measurement of the transmission frequency characteristics at
all the listening positions P1 to P4 is completed, the worker operates the operation unit 9 to
input a measurement completion.
[0053]
When the CPU 11 of the karaoke apparatus 1 detects that the input operation of measurement
completion is performed by the operation unit 9, it reads out the transmission frequency
characteristic measurement data of all listening positions, and controls the equalizing processing
unit 12 in the normal mode. Create correction data. That is, the CPU 11 creates weighted average
data so that all the listening positions P1 to P4 have the same weight. Further, the CPU 11
creates a plurality of weighted average data so that the weight of one of the listening positions
among all the listening positions is heavy.
[0054]
First, the CPU 11 equalizes the weight of the transmission frequency characteristic data
measured at four points of all the listening positions P1 to P4, and creates weighted transmission
frequency characteristic data.
[0055]
Further, the CPU 11 increases the weight of one listening position among all listening positions
P1 to P4 so that the transmission frequency characteristic of the position (listening position) of
the singer becomes better than the other listening positions. Create weighted average
transmission frequency characteristic data.
[0056]
FIG. 6 is a diagram showing transmission frequency characteristics of the listening positions P1
to P4 and weighted average transmission frequency characteristics.
For example, it is assumed that the transmission frequency characteristics at the listening
positions P1 to P4 of the karaoke box 101 are as shown in FIGS. 6 (A) to 6 (D), respectively.
08-05-2019
17
That is, the listening position P1 has a slightly higher signal level in the low band, the listening
position P2 has a slightly lower signal level in the low band, the listening position P3 has a
slightly higher signal level in the high band, and the listening position P4 has a signal level in the
high band Is slightly smaller. In this case, when weighting of each listening position is equalized
and weighted average, as shown in FIG. 6E, the characteristic is flat from low to high. In addition,
when the weighting of the listening position P1 is doubled and weighted average of the other
listening positions, as shown in FIG.
[0057]
Further, in the karaoke box 101, the listening positions P2 and P3 are suitable for singing in a
duet at two adjacent seats in front of the monitor 115, so that the worker can particularly
improve the transmission frequency characteristics of these two seats. Set to That is, the worker
increases the weighting of the listening positions P2 and P3 among the listening positions P1 to
P4 and performs weighted averaging. Then, the operator instructs from the operation unit 9 to
create correction data for correcting the measurement data to a desired transmission frequency
characteristic. Among the transmission frequency characteristics of the listening positions P1 to
P4, the CPU 11 performs weighted averaging by increasing the weight of the measurement data
of the listening positions P2 and P3.
[0058]
When the CPU 11 generates weighted average data as described above, as described with
reference to FIG. 3, the correction for correcting by the equalizing processing unit 12 so that the
weighted average data has desired transmission frequency characteristics Create data
[0059]
Next, the measurement mode when the number of users is relatively large will be described.
As shown in FIG. 5B, in the karaoke box 102, the tables 121 and 122 are installed at the center
of the room, and the sofas 123A and 123D are disposed along the two opposing sides of the
table 121. Sofas 123B and 123C are respectively arranged along the sides. In addition, the
karaoke apparatus 1, the speakers 15L and 15R, and the monitor 125 are installed along the wall
102A at a position distant from one side of the table 121. The karaoke box 102 is for eight
people and eight seats (listening positions) are set. The user can sit at listening positions P11 and
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P12 of the sofa 123A, listening positions P13 and P14 of the sofa 123B, listening positions P15
and P16 of the sofa 123C, or listening positions P17 and P18 of the sofa 123D.
[0060]
The worker causes the karaoke apparatus 1 to create correction data of the equalizing processing
unit 12 by measuring the transmission frequency characteristics at the listening positions P11 to
P18 as in the case of the karaoke box 101 shown in FIG. 5 (A). it can. However, when there are
many measurement points, it takes time for measurement, and the data for correction created
after measurement also becomes huge. Therefore, in the karaoke apparatus 1, it is possible to
execute the simplified measurement mode in which the listening position at which the
transmission frequency characteristic is measured is limited.
[0061]
In the simple measurement mode, it is possible to limit the listening positions at which the
transmission frequency characteristics are measured to four seats. For example, in the case of the
karaoke box 102, the transmission frequency characteristics are measured at four listening
positions P11, P14, P15, and P18, and correction data is created by arithmetic mean (simple
average) to measure time or correction. The amount of data can be reduced.
[0062]
Further, in the simple measurement mode, it is possible to further limit the listening positions at
which the transmission frequency characteristics are measured to two seats forming a diagonal
of the table. For example, in the case of the karaoke box 102, transmission frequency
characteristics are measured at two listening positions P11 and P15 or listening positions P14
and P18, which are diagonal positions of the tables 121 and 122, and weights are made equal.
The measurement time and the correction data can be suppressed by creating the correction data
by a weighted average (that is, arithmetic mean).
[0063]
08-05-2019
19
Here, the transmission frequency characteristics of all listening positions P11 to P18 are
measured and the arithmetically averaged data and the transmission frequency characteristics
measured at four positions of listening positions P11, P14, P15, P18 And data obtained by
arithmetically averaging transmission frequency characteristics measured at two listening
positions P11 and P15 or listening positions P14 and P18, both determine the transmission
frequency characteristics in the vicinity of the middle of the table 121 and the table 122 P19.
Each value is an approximate value. Therefore, the transmission frequency characteristics at each
listening position can be improved on average even by the simple measurement mode as
described above.
[0064]
Next, the normal mode in the karaoke apparatus 1 will be described. In the karaoke apparatus 1,
the transmission frequency characteristic in the normal mode can be improved by performing
the above processing in the measurement mode. As shown in FIG. 1B, in the normal mode, the
karaoke apparatus 1 performs karaoke performance using each part except the test sound source
21 and the characteristic measurement part 22.
[0065]
That is, the karaoke apparatus 1 includes an operation unit 9, a memory 10, a CPU 11, an
equalizing processing unit 12, a D / A converter 13, power amplifiers 14L and 14R, speakers 15L
and 15R, a microphone 16, an echo processing unit 17, an A / D converter A karaoke
performance is performed by the mixer 18 and the sound source 20. Here, since the system
configuration of the karaoke apparatus is known, the detailed description is omitted.
[0066]
The sound source 20 is a known sound source for karaoke, generates a musical tone signal of
digital format based on music data of karaoke music, and outputs it to the mixer 19.
[0067]
The microphone 16 picks up the singing voice of the singer to generate a pick-up signal, and
outputs the pick-up signal to the echo processing unit 17.
08-05-2019
20
[0068]
The echo processing unit 17 performs echo processing on the collected sound signal according
to the echo setting set by the singer or the like by operating the operation unit 9, and outputs the
collected sound signal after the echo processing to the A / D converter 18.
[0069]
The A / D converter 18 converts the collected sound signal after the echo processing into a
digital form and outputs it to the mixer 19.
[0070]
The mixer 19 mixes the tone signal and the collected sound signal after echo processing to
generate a mixing signal, and outputs the mixing signal to the equalizing processing unit 12.
[0071]
The equalizing processing unit 12 corrects the mixing signal by each of the PEQs 121 to 12n set
in the transmission frequency characteristic correction mode described above, and outputs the
corrected mixing signal to the D / A converter 13.
[0072]
The D / A converter 13 converts the mixing signal whose transmission frequency characteristic
has been corrected from digital format to analog format, outputs the mixing signal for Lch to the
power amplifier 14L, and outputs the mixing signal for Rch to the power amplifier 14R Do.
The power amplifiers 14L and 14R amplify the mixed signal and output the amplified signals to
the speakers 15L and 15R.
[0073]
The speakers 15L and 15R emit the sound based on the amplified mixing signal into the room.
[0074]
08-05-2019
21
With such a configuration, the musical tones and singing sounds emitted from the speakers 15L
and 15R are corrected to desired transmission frequency characteristics and reach the singer
holding the microphone 16 and the listener sitting on each chair. .
Thus, a singer or a listener can listen to karaoke musical tones and singing sounds.
[0075]
In the karaoke apparatus 1, by setting the listening position where the user sits down by
operating the operation unit 9 at the start of the normal mode, the transmission frequency
characteristic at each listening position is improved, and on average or partially. It is possible to
make the transmission frequency characteristic of the listening position of the above particularly
good.
[0076]
When the user starts singing at the karaoke box 101, the karaoke apparatus 1 corrects the
transmission frequency characteristics on average at the listening positions of the singer and the
listener, unless nothing is operated. Are adjusted to adjust the equalizing processing unit 12.
As a result, the transmission frequency characteristics are improved on average at the listening
positions of the singer and the listener, resulting in good transmission frequency characteristics.
[0077]
On the other hand, when the user starts singing at the karaoke box 101, the karaoke apparatus 1
operates the operation unit 9 to set the position of the singer, whereby the karaoke apparatus 1
is set to the listening position (song position). The equalization processing unit 12 is adjusted by
reading correction data weighted and averaged so that the transmission frequency characteristics
become particularly good.
As a result, the transmission frequency characteristic is improved on average at each listening
position of the listener, and the transmission frequency characteristic of the listening position
(song position) of the singer is particularly improved, and the transmission frequency
08-05-2019
22
characteristic of the listening position of the listener Will be better.
Therefore, the singer can sing comfortably.
[0078]
Also, in the karaoke apparatus 1, at the start of a karaoke song, the measurement sound in the
form of impulses is emitted from two speakers, and this sound is collected by the microphone 16
to automatically detect the position of the singer. It is also possible to set the transmission
frequency characteristic of the position of the singer to be particularly good.
[0079]
When the CPU 11 of the karaoke apparatus 1 is set to automatically detect the position of the
singer in the normal mode, an impulse-like test sound signal is generated at the sound source 20
before the performance of the karaoke music is started. The test sound is emitted in order from
the speakers 15L and 15R.
The test sound is collected by the microphone 16, a test sound pickup signal is generated, and is
sent to the CPU 11 through the A / D converter 18 and the mixer 19.
[0080]
At this time, the CPU 11 causes the speaker 15L to emit a test sound, and the microphone 16 to
pick up the test sound, and counts an arrival time t1 (first arrival time) until the test sound
pickup signal is detected.
Further, similarly, the CPU 11 counts the arrival time t2 (second arrival time) from when the
speaker 15R emits the test sound to when the test sound pickup signal is detected.
Then, the CPU 11 calculates the position of the microphone 16 using the arrival time t1 and the
arrival time t2 using a known triangulation method.
08-05-2019
23
[0081]
Since the singer usually has the microphone 16 before the performance of the karaoke song, the
karaoke apparatus 1 can detect the position of the singer who will sing from now by detecting
the position of the microphone 16 as described above. it can.
Then, based on the detected position of the microphone 16, the CPU 11 of the karaoke apparatus
1 reads out and sets the corresponding data from the memory 10 so that the transmission
frequency characteristic of the position becomes particularly good. As a result, the karaoke
apparatus 1 can automatically set the transmission frequency characteristic of the position of the
singer to be particularly good.
[0082]
Next, in the karaoke apparatus of the present invention, it is possible to efficiently measure the
transmission frequency characteristics of the listening position by using a plurality of
microphones in the measurement mode. FIG. 7 is a block diagram showing a schematic
configuration of the karaoke apparatus having two microphones, in which (A) shows a
configuration in the measurement mode and (B) shows a configuration in the normal mode. In
FIG. 7, portions not used in each mode are indicated by dotted lines. The karaoke apparatus 1B
shown in FIG. 7 has a configuration in which the karaoke apparatus 1 shown in FIG. 1 has one
microphone, while the karaoke apparatus 1B shown in FIG. 7 has two microphones as an
example. It is a structure. Therefore, in the following description, different parts are mainly
described.
[0083]
Similar to the karaoke apparatus 1, the karaoke apparatus 1B includes an operation unit 9, a
memory 10, a CPU 11, an equalizing processing unit 12, a D / A converter 13, power amplifiers
14L and 14R, speakers 15L and 15R, a sound source 20, a test sound source 21, And a
characteristic measurement unit 22. Also, unlike the karaoke apparatus 1, the karaoke apparatus
1B includes microphones 16A and 16B, echo processing units 17A and 17B, A / D converters
18A and 18B, and a mixer 19B. These are configurations for a duet.
08-05-2019
24
[0084]
In the measurement mode, the mixer 19B of the karaoke apparatus 1B picks up and generates
the microphones 16A and 16B, mixes the test collected signals digitized by the A / D converters
18A and 18B, and mixes the test mixing signals. It is generated and output to the characteristic
measurement unit 22. In the normal mode, the mixer 19B mixes and mixes the sound collection
signal generated by the microphones 16A and 16B and generated by the microphones 16A and
16B and digitized by the A / D converters 18A and 18B with the tone signal output from the
sound source 20. A signal is generated and output to the equalizing processing unit 12.
[0085]
FIG. 8 is a top view showing the arrangement of equipment in the karaoke box. As shown in FIG.
8A, when the karaoke apparatus 1B includes two microphones 16A and 16B for duet, it is
possible to simultaneously measure the transmission frequency characteristics of two listening
positions in the measurement mode. it can. Thereby, measurement of the transmission frequency
characteristic of a listening position can be performed efficiently. For example, as shown in FIG.
8A, when measuring transmission frequency characteristics limited to the listening positions P2
and P3 for a duet, the microphone 16A is installed at the listening position P2, and the
microphone 16B is installed at the listening position P3. Can be measured, and the transmission
frequency characteristics of the listening positions P2 and P3 can be measured in a short time.
[0086]
Further, as shown in FIG. 7A, in the karaoke apparatus 1B, in the measurement mode, the mixer
16A mixes the test sound signal collected and generated by the microphone 16A and the test
sound signal collected and generated by the microphone 16B. Since mixing is performed at 19 B,
the CPU 11 temporarily stores measurement data of transmission frequency characteristics of
the listening positions P 2 and P 3 in the memory 10 as in the karaoke apparatus 1 shown in FIG.
This eliminates the need for processing, and it suffices to create correction data for correcting
the transmission frequency characteristics of each partial frequency band component of the test
mixing signal to a desired transmission frequency characteristic, so the processing in the
measurement mode can be simplified.
[0087]
08-05-2019
25
Also, in the karaoke apparatus 1B, in the karaoke box 101 shown in FIG. 8A, when measuring the
transmission frequency characteristics for all of the listening positions P1 to P4, for example, the
microphone 16A is first set to the listening position P2. The microphone 16B is placed at the
listening position P3 to measure the transmission frequency characteristics, and data obtained by
adding these is temporarily stored in the memory 10.
Subsequently, the microphone 16A is installed at the listening position P1 and the microphone
16B is installed at the listening position P4, the transmission frequency characteristic is
measured, and the data obtained by adding these is temporarily stored in the memory 10. Then,
both measurement data are read out, arithmetically averaged, and data for correcting the average
data so as to have a desired transmission frequency characteristic is created. This enables
efficient measurement even when measuring the transmission frequency characteristics of all
listening positions.
[0088]
Further, as described above, in the case of measuring the transmission frequency characteristics
of the listening position diagonally forming the table in the karaoke box 102, for example, as
shown in FIG. 8B, the microphone 16A is installed at the listening position P11. Then, the
microphone 16B is installed at the listening position P15 to measure the transmission frequency
characteristic by collecting the test sound. Thereby, it can measure in a short time.
[0089]
By further increasing the number of microphones, transmission frequency characteristic data at
each listening position can be measured more efficiently.
[0090]
Next, in the normal mode, as shown in FIG. 7B, the karaoke apparatus 1B causes the speakers
15L and 15R to emit impulse-like sound before the performance of the karaoke song, and the
microphones 16A and 16B pick up the sound. Thus, as in the karaoke apparatus 1, the positions
of two singers who use the microphones 16A and 16B can be detected.
08-05-2019
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This makes it possible to detect the positions of two singers when duet etc. and read out the
correction data for controlling the equalizing processor 12 so as to improve the transmission
frequency characteristics at the positions of the two singers. It becomes.
[0091]
Further, in the karaoke apparatus 1, in the measurement mode, only the measurement of the
transmission frequency characteristic for each listening position is performed, and the
measurement data of the transmission frequency characteristic is stored in the memory 10, and
the users are all users in the normal mode. When setting the seat (listening position) or setting
the duet, the measurement data of the transmission frequency characteristic of the set listening
position is read out from the memory 10, and the equalizing processing unit 12 is made to have
the desired transmission frequency characteristic. Correction data may be created to adjust the
equalizing processing unit 12.
[0092]
For example, in the karaoke box 101 shown in FIG. 8A, when the karaoke apparatus 1B is in the
normal mode, the user first sets a seat (listening position) when starting the karaoke.
When two users use the karaoke box 101 and use the listening positions P1 and P2, these
positions are set as a seat by a remote control (not shown) (the operation unit 9). When detecting
the setting, the CPU 11 of the karaoke apparatus 1B reads out the measurement data of the
transmission frequency characteristics of the listening positions P1 and P2 and equalizes the
weights for the two seats and performs weighted averaging. Then, as described with reference to
FIG. 3, the CPU 11 creates correction data and adjusts the equalizing processing unit 12 so that
the weighted average transmission frequency characteristic becomes a desired transmission
frequency characteristic.
[0093]
As a result, since the listening position can be limited, the transmission frequency characteristic
can be further improved.
[0094]
08-05-2019
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It is a block diagram which shows the structure of a karaoke apparatus.
It is a block diagram showing composition of a characteristic measurement part, and a figure
showing a division concept of a frequency band. It is a transmission frequency characteristic
figure for demonstrating the correction method and concept of a transmission frequency
characteristic. It is a block diagram which shows the structure of an equalizing process part. It is
a top view which shows the layout of a karaoke box. It is a figure which shows the transmission
frequency characteristic of listening position P1-P4, and the transmission frequency
characteristic weighted. It is a block diagram which shows schematic structure of the karaoke
apparatus provided with two microphones. It is a top view which shows arrangement |
positioning of the goods in a karaoke box.
Explanation of sign
[0095]
1, 1B: Karaoke apparatus 9: Operation unit 10: Memory 11: CPU 12: Equalizing processing unit
13: D / A converter 14L, 14R: Power amplifier 15L, 15R: Speaker 16, 16A, 16B: Microphone 17,
17A, 17B ... Echo processing unit 18, 18A, 18B ... A / D converter 19, 19B ... Mixer 20 ... Sound
source 21 ... Test sound source 22 ... Characteristic measurement unit 101, 102 ... Karaoke box
115, 125 ... Monitor
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