JP5338038B2 - Sound field correction apparatus and karaoke apparatus - Google Patents

Description

  The present invention relates to a sound field correction apparatus that measures a transmission frequency characteristic at a place where a user is present and corrects the transmission frequency characteristic to a desired transmission frequency characteristic.

  In a karaoke store, a plurality of rooms having different sizes are generally prepared so that a room (also referred to as a karaoke box) having an optimum size according to the number of users can be provided. In each room, the microphone used by the singer, the karaoke device that mixes the sound collected by the microphone and the musical sound of the karaoke performance, the speaker that emits the sound mixed by the karaoke device, the video output from the karaoke device A monitor to be displayed and equipment such as a chair and a table used by the user are arranged in accordance with the width and shape of the equipment.

  In this way, the transmission frequency characteristics differ depending on the size, shape, and arrangement of equipment in each room, resulting in transmission frequency characteristics that are not preferred by the user, or a closed loop for sound transmission is formed and a specific frequency band Signal level may become extremely high and howling may occur. In addition, since the transmission frequency characteristic differs depending on the position where the user is seated or the position where the user sings (also referred to as the listening position), the sound may not be so good depending on the position.

Conventionally, with respect to these problems, an equalizer is provided in a karaoke apparatus or the like, and the transmission frequency characteristic is corrected by this equalizer. For example, a howling prevention device that sets an equalizer to attenuate the signal level in the transmission frequency band where howling occurs, or correction of audio characteristics, but the operator does not make the corrected characteristics extreme. There has been a sound field correction apparatus that appropriately sets a correction level and a correction frequency band (see, for example, Patent Documents 1 and 2).
JP-A-8-84394 Japanese Unexamined Patent Publication No. 7-38988

  However, the conventional apparatus cannot improve the transmission frequency characteristics at any listening position, and in addition, cannot improve the transmission frequency characteristics at some listening positions.

  Therefore, an object of the present invention is to provide a sound field correction apparatus that can improve transmission frequency characteristics at any of a plurality of listening positions in a room.

  The present invention has the following configuration as means for solving the above problems.

(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 that picks up the test sound and generates a test sound pickup signal;
The test sound pickup signal is divided into a plurality of partial frequency band components, and characteristic measurement means for measuring transmission frequency characteristics of each partial frequency band component;
Storage means for storing measurement data of transmission frequency characteristics of each partial frequency band component;
An equalizing means for dividing the audio signal to be output to the speaker into a plurality of partial frequency band components and correcting the transmission frequency characteristics of each partial frequency band component;
For each test sound pickup signal generated from the test sound picked up by the microphone at a plurality of locations, the measurement data of the transmission frequency characteristic of the partial frequency band component is read from the storage means, and the weighted average is obtained. A control unit that creates correction data for correcting the transmission frequency characteristic of the partial frequency band component to a desired transmission frequency characteristic, and controls the equalizing unit to correct the transmission frequency characteristic based on the correction data;
It is provided with.

  In this configuration, the sound field correcting device emits a test sound based on the test sound signal generated by the test sound source means from the speaker, and collects the test sound at a plurality of locations by the microphone to obtain the test sound pickup signal. Generate. 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. In the sound field correction apparatus, the control means reads the measurement data of the transmission frequency characteristics of the partial frequency band component from the storage means for each test sound pickup signal collected / generated at a plurality of locations, and performs weighted averaging. Then, correction data for correcting the transmission frequency characteristic of each partial frequency band component obtained by weighted averaging to a desired transmission frequency characteristic is created, and the equalizing means is made to correct the transmission frequency characteristic based on the correction data. Therefore, the transmission frequency characteristics at only some locations adjusted as in the prior art are very good and the other locations are not bad, and the transmission frequency characteristics at each location can be improved on average.

  (2) The control means is characterized in that the weights of the test sound pickup signals picked up at the plurality of places are equalized and weighted averaged.

  In this configuration, the weights of the test sound pickup signals collected at a plurality of locations are equalized and weighted and averaged, and the transmission frequency characteristics of each partial frequency band component are corrected to the desired transmission frequency characteristics. Therefore, the transmission frequency characteristics at each location can be improved on average.

  (3) The control means may perform weighted averaging by increasing the weight of the test sound pickup signal collected at a specific place among the test sound pickup signals collected at the plurality of places.

  In this configuration, among the test sound pickup signals picked up at a plurality of locations, the weight of the test sound pickup signal picked up at a specific location is increased and weighted averaged, and the transmission frequency characteristics of each partial frequency band component Is corrected to a desired transmission frequency characteristic. Therefore, it is possible to improve the transmission frequency characteristics at each location as a whole and to improve the transmission frequency characteristics at a specific location as compared with other locations. Thereby, it is possible to particularly improve the transmission frequency characteristics of a place where the user often uses and a place where the user normally uses. For example, when the sound field correction device is applied to a karaoke device, measurement is performed at a plurality of seat positions and the singing position before the monitor, and the weight of the singing position before the monitor is increased, so that the transmission frequency of the seat is increased. While improving a characteristic, the transmission frequency characteristic of a song position can be made the best.

  (4) The control means may perform weighted averaging on each test sound pickup signal picked up at a specific number of places as the plurality of places.

  In this configuration, the measurement data of the transmission frequency characteristics of each partial frequency band component is read from the storage means and weighted averaged for each test sound pickup signal picked up at a specific number of places as a plurality of places. Therefore, it is possible to speed up the measurement by limiting the places where the test sound is collected to a specific number of places. For example, when the sound field correction apparatus is applied to a karaoke apparatus, even if there are five or more seats around the table, the measurement locations are the four corners around the table, the two diagonals of the table, Or, it is possible to speed up the measurement by limiting to two seats that are often used when singing duet, such as two adjacent seats in front of the monitor. In addition, the transmission frequency characteristics obtained by weighted average of the measurement data obtained by measuring the transmission frequency characteristics at several specific places as described above and the transmission frequency characteristics obtained by weighted average of the measurement data obtained by measuring the transmission frequency characteristics at all seats are approximated. Therefore, even if the number of measurement points is reduced, the transmission frequency characteristic can be corrected without any problem.

(5) test sound source means for generating a test sound signal;
A speaker for emitting a test sound based on the test sound signal;
A plurality of microphones for collecting the test sound and generating a test sound pickup signal;
Mixing means for generating a test mixing signal by mixing each test sound pickup signal picked up by the plurality of microphones;
Characteristic measurement means for dividing the test mixing signal into a plurality of partial frequency band components and detecting a signal level of each partial frequency band component;
An equalizing means for dividing the audio signal to be output to the speaker into a plurality of partial frequency band components and correcting the transmission frequency characteristics of each partial frequency band component;
Correction data for correcting the transmission frequency characteristic of each partial frequency band component of the test mixing signal to a desired transmission frequency characteristic is created, and control is performed so that the equalizing means corrects the transmission frequency characteristic based on the correction data. Control means;
It is provided with.

  In this configuration, the sound field correcting device emits a test sound based on the test sound signal generated by the test sound source means from the speaker, and picks up the test sound at a plurality of places by a plurality of microphones, and mixes the sound. Generate a test mixing signal mixed with. 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. In the sound field correction apparatus, the control means creates 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, and the equalizing means is based on the correction data. To correct the transmission frequency characteristics. Therefore, since the test sound pickup signals picked up by a plurality of microphones are mixed by the mixing means, it is not necessary to perform the weighted average processing, and the processing speed can be increased.

(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;
With
The control means reads from the correction data storage means correction data obtained by weighting and averaging the weight of a specific place based on the input received by the operation means, and the equalizing means is based on the correction data. Control is performed to correct the transmission frequency characteristic.

  In this configuration, the control means reads correction data obtained by weighting and averaging the weight of the specific place from the storage means on the basis of the input for selecting the specific place received by the operation means. Based on the data, the equalizing means corrects the transmission frequency characteristic. Therefore, in the sound field correction apparatus, when correcting the sound field, it is possible to set the transmission frequency characteristics of the specific place to be particularly improved by operating the operation means and selecting the specific place.

(7) correction data storage means for storing a plurality of correction data created by the control means;
A sound source means for generating a measurement sound signal;
With
The speaker has two speakers that emit measurement sound,
The control means causes the sound source means to generate a measurement sound signal, and the time from when the two speakers emit the measurement sound based on the measurement sound signal until the microphone picks up each measurement sound. The microphone position is calculated based on the correction data, correction data corresponding to the calculated microphone position information is read from the correction data storage means, and the equalizing means corrects the transmission frequency characteristic based on the correction data. It is characterized by controlling to.

  In this configuration, the control means of the sound field correction apparatus causes the sound source means to generate a measurement sound signal and emit the measurement sounds from the two speakers. Then, the position of the microphone is calculated based on the time from when each of the two speakers emits the measurement sound until the microphone picks up each measurement sound, and the correction data corresponding to the calculated position information of the microphone Is read from the correction data storage means, and the equalizing means is caused to correct the transmission frequency characteristic based on the correction data. Therefore, in the sound field correction apparatus, the microphone position is calculated, and the correction data that particularly improves the transmission frequency characteristic of the microphone position is read, and the transmission frequency characteristic is adjusted by the equalizing means, and the microphone is used. The transmission frequency characteristic at the position where the person is present can be particularly improved.

  According to the present invention, transmission frequency characteristics can be improved at any of a plurality of listening positions in a room.

  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, a case where a sound field correction device is applied to a karaoke device used in a karaoke box or the like will be described as an example. FIG. 1 is a block diagram showing a configuration of a karaoke apparatus, where (A) shows a configuration in a measurement mode, and (B) shows a configuration in a normal mode. In FIG. 1, portions not used in each mode are indicated by dotted lines. FIG. 2A is a block diagram illustrating a configuration of the characteristic measurement unit, and FIG. 2B is a diagram illustrating a concept of dividing a frequency band. FIG. 3 is a transmission frequency characteristic diagram for explaining a transmission frequency characteristic correction method and concept. In the figure, (A) shows the normalized transmission frequency characteristic 250 of the collected sound signal when white noise is emitted from the speakers 15L and 15R and collected by the microphone 16, and (B) shows the transmission of the collected sound signal. The concept of the peak and the dip based on the frequency characteristic 250 and the desired transmission frequency characteristic 260 set in advance is shown. (C) is a sound collection signal after correction processing in the equalizing processing unit 12 (sound collection signal after transmission frequency characteristic correction) ) And a desired transmission frequency characteristic 260 are shown. FIG. 3 shows a case where a peak 272 and a dip 271 to be corrected exist in the determination target frequency band FB region. FIG. 4 is a block diagram showing a configuration of the equalizing processing unit.

  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, a power amplifier 14L / 14R, a speaker 15L / 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.

  In the measurement mode, the karaoke device 1 has a plurality of locations (hereinafter referred to as listening) such as a seat where a user around the karaoke device 1 sits and a stage where a singer sings in order to correct transmission frequency characteristics at a plurality of listening positions. The test sound is picked up at a position (also referred to as a position), and measurement data of a plurality of test sound signals are temporarily stored in the memory. When the sound collection of the test sound is completed, the measurement data of the transmission frequency characteristics at all listening positions is read from the memory, and a plurality of weighted average data (weighted average transmission frequency characteristic data) weighted according to the sound collection location is created. To do. And the karaoke apparatus 1 adjusts the equalizing process part 12, and produces the correction data which correct | amends this weighted average transmission frequency characteristic data to the desired transmission frequency characteristic data set beforehand.

  In the measurement mode, the karaoke apparatus 1 performs the above-described processing using each unit excluding the echo processing unit 17, the mixer 19, and the sound source 20.

  Specifically, when the CPU 11 detects that the operation unit 9 has received a measurement mode start input, the CPU 11 outputs a control signal instructing the test sound source 21 to start generating a test sound signal.

  When the test sound source 21 detects this control signal, the test sound source 21 generates a test sound signal for measuring the transmission frequency characteristic that is set in advance or designated by the CPU 11. As the test sound signal, for example, a sound signal including the entire audible frequency band, such as a white noise signal and a pink noise signal, is suitable.

  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 analog test sound signal to the power amplifiers 14L and 14R.

  The power amplifiers 14L and 14R amplify the test sound signal with an amplification factor set in advance or designated by the CPU 11, and output the amplified signal to the speaker 15L and the speaker 15R, respectively.

  The speakers 15L and 15R emit a test sound based on the test sound signal into the room where the transmission frequency characteristic is measured. For example, when measuring the transmission frequency characteristic of a karaoke box, a test sound based on the test sound signal is emitted from a speaker installed in the karaoke box.

  A microphone (hereinafter simply referred to as a microphone) 16 is installed in any of a plurality of places (seats and singing positions) in the same room as the speakers 15L and 15R for improving the transmission frequency characteristics. For example, it is installed in a seat in front of a monitor installed in a karaoke box. The microphone 16 collects the test sound emitted from the speakers 15 </ b> L and 15 </ b> R, generates a test sound pickup signal, and outputs it to the echo processing unit 17.

  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.

  The A / D converter 18 converts the test sound pickup signal from an analog format to a digital format and outputs the converted signal to the characteristic measurement unit 22.

  As shown in FIG. 2 (B), the characteristic measurement unit 22 divides a preset measurement frequency range FZ 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 output to the CPU 11. Specifically, in the partial frequency bands FB1 to FBm, the measurement frequency range FZ corresponding to the frequency band to be measured, which is set in advance from the speaker characteristics, the microphone characteristics, and the like, is, for example, m at equal frequency bands on the logarithmic axis. The divided bands are set to FB1, FB2,... FBm in order from the low frequency side.

  As shown in FIG. 2A, the characteristic measuring unit 22 detects band pass filters (hereinafter referred to as BPF) 221 to 22m corresponding to the number m of the partial frequency bands and the signal levels of the partial frequency bands. Signal level detectors 231 to 23m are provided. The BPF corresponding to each partial frequency band and the signal level detector are connected in series to form a series circuit, and m series circuits corresponding to each partial frequency band 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 detector 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, and the FBm band BPF 22m and the FBm signal level detection unit 23m corresponding to the mth partial frequency band FBm are connected in series, and the FBm signal detection series circuit is formed. It is formed. Such an FBm signal detection series circuit group is connected in parallel between the A / D converter 18 and the CPU 11.

  When the test sound pickup signal output from the A / D converter 18 is input, the BPFs 221 to 22m output a signal having a set frequency band component. In other words, the BPFs 221 to 22m decompose the test sound pickup signal output from the A / D converter 18 into m partial frequency band components.

  The signal level detectors 231 to 23m detect the signal levels of the partial frequency band component signals output from the BPFs 221 to 22m, respectively, and output the level values to the CPU 11 together with the partial frequency band information.

  In addition, the characteristic measurement unit 22 includes a full-band signal level detection unit 230 that detects a 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 the original signal level value. Output.

  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 in the memory 10 together with the partial frequency band information in order to correct the transmission frequency characteristics at 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 above processing until the number of times set by the operator operating the operation unit 9 or until the operator inputs the end of measurement.

  When the CPU 11 completes the above processing, it reads out the level value of each partial frequency band component signal of all test sound signals collected at different locations from the memory 10 and weights corresponding to the sound collection location for each partial frequency band component. Applies a weighted average.

  In addition, the CPU 11 reads out the original signal level values of all the test sound signals collected at different places from the memory 10, and performs weighted averaging with weights according to the places where the sounds are collected. The details of the weighting method according to the sound collection location will be described later.

  Subsequently, the CPU 11 normalizes the level value of each partial frequency band component signal subjected to the weighted average with the original signal level value subjected to the weighted average. The CPU 11 displays the normalized partial frequency band component signal level value (normalized partial band signal level) and the normalized desired transmission frequency characteristic stored in advance in the memory 10 for each partial frequency band. To detect a peak and a dip with respect to a desired transmission frequency characteristic. Here, the desired transmission frequency characteristic is a target value of the transmission frequency characteristic set in advance so as to obtain a good transmission frequency characteristic in the karaoke box. A peak indicates a portion where the normalized subband signal level is higher than the desired transmission frequency characteristic, and a 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 dip using the method described below.

  When the weighted average measurement data has a transmission frequency characteristic 250 as shown in FIG. 3A, the CPU 11 detects a peak 272 and a 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 has a correction value (in the direction indicated by the arrow in FIG. 3B) having the same level as the difference value from the level of the desired transmission frequency characteristic in the corresponding partial frequency band of the dip 271 together with the peak 272, and having the opposite sign. Correction value). For example, for the peak 272, a correction value “−” is set as the correction in the direction to suppress, and for the dip 271, a correction value “+” is set as the correction in the direction to increase. At this time, the CPU 11 determines, based on the sound emission characteristics of the speakers 15L and 15R and the sound collection characteristics of the microphone 16, the predetermined frequency region on the high frequency side of the entire frequency band FZ where sound collection or sound emission is not complete, and the low frequency side. No calculation is performed for the predetermined frequency band. That is, the CPU 11 sets a frequency band in which sound can be collected or emitted sufficiently as the determination target frequency band FB, and calculates a difference value and a difference direction in the determination target frequency band FB. Thereby, 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. In addition, although the case where both the sound emission characteristic of a speaker and the sound collection characteristic of a microphone were considered was demonstrated, you may make it consider only one of them.

  The CPU 11 sets correction parameters for each of the parametric equalizers (hereinafter referred to as PEQ) 121 to 12n of the equalizing processing unit 12 based on the calculated correction value. As a result, as shown in FIG. 3C, a transmission frequency characteristic 251 that is substantially the same as the desired transmission frequency characteristic in the determination target frequency band FB and similar to the desired transmission frequency characteristic in the entire frequency range FZ is realized. be able to.

  The equalizing processing unit 12 is composed of PEQ multistage cascade connection, and in the example shown in FIG. 4, n PEQs 121 to 12n are cascade-connected. Each of the PEQs 121 to 12n is provided with correction parameters from the CPU 11, and performs equalizing processing using these correction parameters. Thereby, the equalization processing unit 12 can be set so that the transmission frequency characteristic of the room in which the speakers 15L and 15R and the microphone 16 are installed is corrected to a desired transmission frequency characteristic and emitted.

  Here, although the equalizing processing unit 12 is configured by the cascaded PEQ, an analog equalizer or a graphic equalizer may be used.

  The CPU 11 stores correction parameters for realizing the transmission frequency characteristic 251 in the memory 10, reads the correction parameters from the memory 10 according to the setting in the normal mode, controls the equalizing processing unit 12, and The sound emitted from 15L and 15R is corrected so as to have a desired transmission frequency characteristic.

  Next, details of the weighted average process according to the listening position will be described. FIG. 5 is a top view showing the arrangement of the equipment in the karaoke box, where (A) shows a room for four people and (B) shows a room for eight people.

  As shown in FIG. 5A, in the karaoke box 101, a table 111 is installed in the center of the room, and sofas 113A, 113B, and a chair 113C are arranged along the three sides around the table 111. In addition, the karaoke apparatus 1, the speakers 15 </ b> L and 15 </ b> R, and the monitor 115 are installed along the wall 101 </ b> A at a position away from the remaining one side of the table 111. The karaoke box 101 is for four people and has four seats (listening positions). The user can sit at 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).

  The measurement mode of the karaoke apparatus 1 is a mode in which correction data of the equalizing processing unit 12 is created so that the data obtained by measuring the transmission frequency characteristic data at each listening position by the worker and performing the weighted average becomes the desired transmission frequency characteristic. is there.

  An operator installs the karaoke apparatus 1 or the like so that the microphone head of the microphone 16 is positioned in the middle of the speaker 15L and the speaker 15R, that is, the monitor 115 so that the height of the user's ear is at each of the positions P1 to P4. Install toward. And an operator operates the operation part 9 of the karaoke apparatus 1, and measures a transmission frequency characteristic for every listening position in the said process procedure. When the measurement of the transmission frequency characteristics at all listening positions P1 to P4 is completed, the operator operates the operation unit 9 to input measurement completion.

  When the CPU 11 of the karaoke apparatus 1 detects that the measurement completion input operation has been performed by the operation unit 9, it reads out the transmission frequency characteristic measurement data at 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 any listening position among all the listening positions becomes heavy.

  First, the CPU 11 equalizes the weights of the transmission frequency characteristic data measured at the four points of all listening positions P1 to P4, and creates the transmission frequency characteristic data obtained by weighted averaging.

  Further, the CPU 11 increases the weight of one listening position among all the listening positions P1 to P4 so that the transmission frequency characteristic of the singer's position (listening position) is better than the other listening positions. Create weighted average transmission frequency characteristic data.

  FIG. 6 is a diagram illustrating transmission frequency characteristics at 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 characteristics as shown in FIGS. 6 (A) to 6 (D), respectively. That is, the listening position P1 has a slightly higher low-frequency signal level, the listening position P2 has a slightly lower low-frequency signal level, the listening position P3 has a slightly higher high-frequency signal level, and the listening position P4 has a higher-frequency signal level. Is a little smaller. In this case, when the weights of the listening positions are made equal and the weighted average is obtained, as shown in FIG. 6E, a flat characteristic is obtained from the low frequency range to the high frequency range. Further, when the weight of the listening position P1 is set to twice that of the other listening positions and the weighted average is obtained, the low-frequency signal level has a slightly large characteristic as shown in FIG.

  Also, in the karaoke box 101, the listening positions P2 and P3 are two adjacent seats in front of the monitor 115 and are suitable for singing duet, so that the transmission frequency characteristics of these two seats are particularly improved. Set to. That is, the worker sets the listening positions P2 and P3 out of the listening positions P1 to P4 to be weighted and averaged. Then, the operator instructs from the operation unit 9 to create correction data for correcting the measurement data to a desired transmission frequency characteristic. The CPU 11 performs weighted averaging by increasing the weight of the measurement data at the listening positions P2 and P3 among the transmission frequency characteristics at the listening positions P1 to P4.

  When the CPU 11 creates the weighted average data as described above, as described with reference to FIG. 3, the correction for correcting the equalizing processing unit 12 so that the weighted average data has a desired transmission frequency characteristic. Create data.

  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, tables 121 and 122 are installed in the center of the room, and sofas 123A and 123D are arranged along two opposite sides of the table 121. Sofas 123B and 123C are arranged along the sides. In addition, the karaoke apparatus 1, the speakers 15 </ b> L and 15 </ b> R, and the monitor 125 are installed along the wall 102 </ b> A at a position away from one side of the table 121. The karaoke box 102 is for eight people and has eight seats (listening positions). The user can sit at the listening positions P11 and P12 of the sofa 123A, the listening positions P13 and P14 of the sofa 123B, the listening positions P15 and P16 of the sofa 123C, or the listening positions P17 and P18 of the sofa 123D.

  As with the karaoke box 101 shown in FIG. 5A, the worker can cause the karaoke apparatus 1 to create correction data for the equalizing processing unit 12 by measuring transmission frequency characteristics at the listening positions P11 to P18. it can. However, if there are many measurement points, the measurement takes time, and correction data created after the measurement becomes enormous. Therefore, the karaoke apparatus 1 can execute a simple measurement mode that limits the listening position at which the transmission frequency characteristic is measured.

  In the simple measurement mode, the listening position at which the transmission frequency characteristic is measured can be limited to four corner 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), thereby measuring time and correction. The amount of data can be suppressed.

  Further, in the simple measurement mode, the listening position for measuring the transmission frequency characteristic can be further limited to two seats that form the diagonal of the table. For example, in the case of the karaoke box 102, the transmission frequency characteristics are measured at two listening positions P11 and P15 or listening positions P14 and P18 that are diagonal positions of the tables 121 and 122, and the weights are made equal. By creating correction data by weighted average (that is, arithmetic average), measurement time and correction data can be suppressed.

  Here, the transmission frequency characteristics of all listening positions P11 to P18 are measured and arithmetically averaged, and the data obtained by measuring the transmission frequency characteristics at four listening positions P11, P14, P15, and P18 and arithmetically averaging them. And the data obtained by measuring and averaging the transmission frequency characteristics at the two listening positions P11 and P15 or the listening positions P14 and P18, respectively, determine the transmission frequency characteristics of the intermediate P19 between the table 121 and the table 122. Therefore, each value is an approximate value. Therefore, even in this simple measurement mode, the transmission frequency characteristics at each listening position can be improved on average.

  Next, the normal mode in the karaoke apparatus 1 will be described. In the karaoke apparatus 1, the transmission frequency characteristics in the normal mode can be improved by performing the above processing in the measurement mode. As shown in FIG. 1 (B), the karaoke apparatus 1 performs karaoke performance using the units other than the test sound source 21 and the characteristic measurement unit 22 in the normal mode.

  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, a power amplifier 14L / 14R, a speaker 15L / 15R, a microphone 16, an echo processing unit 17, and an A / D converter. 18, karaoke performance is performed by the mixer 19 and the sound source 20. Here, since the system configuration of the karaoke apparatus is known, detailed description is omitted.

  The sound source 20 is a known karaoke sound source, and generates a digital tone signal based on the music data of the karaoke song and outputs it to the mixer 19.

  The microphone 16 collects the singing sound of the singer to generate a collected sound signal, and outputs the collected sound signal to the echo processing unit 17.

  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.

  The A / D converter 18 converts the collected sound signal after the echo processing into a digital format and outputs it to the mixer 19.

  The mixer 19 mixes the musical sound signal and the collected sound signal after the echo processing, generates a mixing signal, and outputs it to the equalizing processing unit 12.

  The equalizing processing unit 12 corrects the mixing signal by each PEQ 121 to 12n set in the above-described transmission frequency characteristic correction mode, and outputs it to the D / A converter 13.

  The D / A converter 13 converts the mixing signal whose transmission frequency characteristic is corrected from a digital format to an analog format, outputs the Lch mixing signal to the power amplifier 14L, and outputs the Rch mixing signal to the power amplifier 14R. To do. The power amplifiers 14L and 14R amplify the mixing signal and output it to the speakers 15L and 15R.

  The speakers 15L and 15R each emit sound based on the amplified mixing signal into the room.

  With such a configuration, the musical sound and the singing sound emitted from the speakers 15L and 15R are corrected to the desired transmission frequency characteristics and reach the singer holding the microphone 16 and the listener sitting on each chair. . Thereby, the singer and listener can listen to the karaoke musical sound and singing sound.

  In the karaoke apparatus 1, at the start of the normal mode, by operating the operation unit 9 and setting the listening position where the user sits, the transmission frequency characteristics at each listening position are improved, and on average or partially The transmission frequency characteristics at the listening position can be improved particularly.

  When the user starts singing at the karaoke box 101, if no particular operation is performed, the karaoke apparatus 1 is corrected data in which transmission frequency characteristics are improved on average at each listening position of the singer and the listener. And the equalizing processing unit 12 is adjusted. Thereby, in each listening position of a singer and a listener, a transmission frequency characteristic is improved on average and it becomes a good transmission frequency characteristic.

  On the other hand, when the user starts singing in the karaoke box 101, the karaoke device 1 sets the position of the singer by operating the operation unit 9, so that the karaoke apparatus 1 has the set listening position (singing position). Correction data weighted and averaged so as to improve the transmission frequency characteristics is read out, and the equalizing processing unit 12 is adjusted. As a result, at each listening position of the listener, the transmission frequency characteristic is improved on average, and the transmission frequency characteristic at the listening position of the singer (singing position) is particularly improved. The transmission frequency characteristic at the listening position of the listener. Will be better. Therefore, the singer can sing comfortably.

  Moreover, in the karaoke apparatus 1, the position of a singer is automatically detected by emitting an impulse-like measurement sound from two speakers at the start of a karaoke song and picking up this sound with the microphone 16. Thus, it is possible to set the transmission frequency characteristic of the singer's position so as to be particularly good.

  If the CPU 11 of the karaoke apparatus 1 is set to automatically detect the position of the singer in the normal mode, an impulse test sound signal is generated in the sound source 20 before the performance of the karaoke song is started. The test sounds are emitted in order from the speakers 15L and 15R. The test sound is picked up by the microphone 16, a test sound pickup signal is generated, and sent to the CPU 11 via the A / D converter 18 and the mixer 19.

  At this time, the CPU 11 measures the arrival time t1 (first arrival time) until the speaker 15L emits the test sound and the microphone 16 picks up the test sound and detects the test sound pickup signal. Similarly, the CPU 11 measures the arrival time t2 (second arrival time) from when the speaker 15R emits the test sound until the test sound pickup signal is detected. Then, the CPU 11 uses the arrival time t1 and the arrival time t2 to calculate the position of the microphone 16 using a known triangulation method.

  Since the singer usually has the microphone 16 before the performance of the karaoke song, the karaoke device 1 can detect the position of the singer to be sung by detecting the position of the microphone 16 as described above. it can. Then, the CPU 11 of the karaoke apparatus 1 reads and sets the corresponding data from the memory 10 based on the detected position of the microphone 16 so that the transmission frequency characteristic at that position is particularly improved. Thereby, in the karaoke apparatus 1, it can set automatically so that the transmission frequency characteristic of a singer's position may become especially good.

  Next, in the karaoke apparatus of the present invention, it is possible to efficiently measure the transmission frequency characteristics at the listening position by using a plurality of microphones in the measurement mode. FIG. 7 is a block diagram showing a schematic configuration of a karaoke apparatus provided with two microphones. (A) shows a configuration in a measurement mode, and (B) shows a configuration in a 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 including two microphones as an example, whereas the karaoke apparatus 1 shown in FIG. It is a configuration. Therefore, in the following description, different parts will be mainly described.

  As with the karaoke device 1, the karaoke device 1 </ b> B has an operation unit 9, a memory 10, a CPU 11, an equalizing processing unit 12, a D / A converter 13, power amplifiers 14 </ b> L / 14 </ b> R, speakers 15 </ b> L / 15 </ b> R, a sound source 20, a test sound source 21, And a characteristic measuring unit 22. 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 duet configurations.

  In the measurement mode, the mixer 19B of the karaoke apparatus 1B picks up and generates the microphones 16A and 16B, mixes the test sound pickup signals digitized by the A / D converters 18A and 18B, and outputs the test mixing signal. Generate and output to the characteristic measurement unit 22. Further, in the normal mode, the mixer 19B collects and generates the sound collected and generated by the microphones 16A and 16B and digitized by the A / D converters 18A and 18B and the musical sound signal output from the sound source 20. A signal is generated and output to the equalizing processing unit 12.

  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 is provided with two microphones 16A and 16B for a duet, it is possible to simultaneously measure the transmission frequency characteristics at the two listening positions in the measurement mode. it can. Thereby, the measurement of the transmission frequency characteristic of a listening position can be performed efficiently. For example, as shown in FIG. 8A, when the transmission frequency characteristic is measured only at the duet listening positions P2 and P3, the microphone 16A is installed at the listening position P2, and the microphone 16B is set at the listening position P3. And collecting the test sound, the transmission frequency characteristics of the listening positions P2 and P3 can be measured in a short time.

  As shown in FIG. 7A, in the karaoke apparatus 1B, in the measurement mode, the test sound signal collected and generated by the microphone 16A and the test sound signal collected and generated by the microphone 16B are mixed. Since the mixing is performed at 19B, the CPU 11 temporarily stores the measurement data of the transmission frequency characteristics at the listening positions P2 and P3 in the memory 10 as in the karaoke apparatus 1 shown in FIG. The processing in the measurement mode can be simplified because correction data for correcting the transmission frequency characteristics of the respective partial frequency band components of the test mixing signal to the desired transmission frequency characteristics can be created.

  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 installed at the listening position P3, the transmission frequency characteristics are measured, and data obtained by adding these is temporarily stored in the memory 10. Subsequently, the microphone 16A is placed at the listening position P1 and the microphone 16B is placed at the listening position P4 to measure the transmission frequency characteristics, and 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 to have a desired transmission frequency characteristic is created. Thereby, even when measuring the transmission frequency characteristics at all listening positions, it is possible to efficiently measure.

  Further, as described above, in the karaoke box 102, when measuring the transmission frequency characteristic of the listening position that forms the diagonal of the table, 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, and the transmission frequency characteristic is measured by collecting the test sound. Thereby, it can measure in a short time.

  Note that the transmission frequency characteristic data at each listening position can be measured more efficiently by further increasing the number of microphones.

  Next, in the karaoke apparatus 1B, as shown in FIG. 7B, in the normal mode, impulse-like sound is emitted from the speakers 15L and 15R before the karaoke music is played, and collected by the microphones 16A and 16B. Thus, similarly to the karaoke apparatus 1, the positions of the two singers who use the microphones 16A and 16B can be detected. Thereby, when performing a duet, etc., it is possible to detect the positions of two singers and to read out correction data for controlling the equalizing processing unit 12 so as to improve the transmission frequency characteristics at the positions of the two singers. It becomes.

  In the karaoke apparatus 1, only the transmission frequency characteristic for each listening position is measured in the measurement mode, and the measurement data of the transmission frequency characteristic is stored in the memory 10. When the seat (listening position) setting or duet setting is performed, the measurement data of the transmission frequency characteristic of the set listening position is read from the memory 10 and the equalizing processing unit 12 is set so as to obtain a desired transmission frequency characteristic. It is also possible to create the correction data and adjust the equalizing processing unit 12 to be adjusted.

  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 karaoke. When two users use the karaoke box 101 and use the listening positions P1 and P2, these positions are set as seats with a remote controller (operation unit 9) (not shown). When the CPU 11 of the karaoke apparatus 1B detects the setting, it reads out the measurement data of the transmission frequency characteristics at the listening positions P1 and P2, and performs a weighted average with the same weight for these two seats. 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.

  Thereby, since a listening position can be limited, a transmission frequency characteristic can be improved further.

It is a block diagram which shows the structure of a karaoke apparatus. It is a block diagram which shows the structure of a characteristic measurement part, and a figure which shows the division | segmentation 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 which carried out the weighted average. 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 equipment in a karaoke box.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1B ... Karaoke apparatus 9 ... Operation part 10 ... Memory 11 ... CPU 12 ... Equalizing process part 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

Claims (2)

A speaker that emits sound;
A microphone that picks up the sound,
Audio signal supply means for supplying an audio signal to the speaker;
A characteristic measuring means for measuring a transmission frequency characteristic from the sound signal supplied from the sound signal supplying means to the microphone after being emitted from a speaker;
Storage means for storing transmission frequency characteristics measured by the characteristic measurement means;
Equalizing means for correcting an audio signal output to the speaker;
Control means for creating correction data for correcting the transmission frequency characteristic to a desired transmission frequency characteristic, and setting a correction amount of the equalizing means based on the correction data;
Playback means for playing back content;
With
The storage means stores the correction data at a plurality of positions,
When the playback unit is instructed to start playback of the content, the control unit emits the measurement sound from the speaker , and the microphone is based on the time until the measurement sound is collected by the microphone. The sound field correction apparatus is characterized in that the correction data corresponding to the calculated microphone position information is read from the storage means and set as the correction amount of the equalizing means based on the correction data. . A karaoke apparatus comprising the sound field correcting apparatus according to claim 1,
The content is song data of a karaoke song,
The playback means plays a karaoke song based on the song data,
The control device sets correction data corresponding to the position information as a correction amount of the equalizing device when an instruction to start playing the karaoke song is given.

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