JP4525134B2 - Sound pressure frequency characteristic adjusting device, program, music reproducing device - Google Patents

Description

  The present invention relates to a technique for presenting an adjustment worker with an adjustment state in a sound pressure frequency characteristic adjustment device.

  2. Description of the Related Art Conventionally, an adjustment technique for correcting a desired sound pressure frequency characteristic using a measurement sound signal such as pink noise is known (see, for example, Patent Document 1). In this conventional adjustment technique, a target sound signal emitted from a speaker is input by a microphone, and a sound pressure frequency characteristic obtained by dividing the input sound signal into a plurality of frequency bands becomes a desired characteristic. This is realized by correcting the sound pressure in each frequency band.

  In particular, in a karaoke system, a karaoke box (room) that actually reproduces and plays music data is different, for example, in terms of size and wall material, and the sound pressure frequency characteristics ( Hereinafter, the target sound pressure frequency characteristic is greatly different from the sound pressure frequency characteristic in the reproduction environment such as in a karaoke box (hereinafter referred to as the reproduction sound pressure frequency characteristic). There is a problem that the acoustic state to be reproduced cannot be sufficiently reproduced.

Therefore, for example, by adjusting the sound pressure frequency characteristics described above when installing a karaoke device, the music data can be played with the same characteristics as the sound pressure frequency characteristics when the music data is produced. ing.
JP-A-6-311587

  The sound pressure frequency characteristics are adjusted so that the gain value (reproduction gain value) that specifies the reproduction sound pressure frequency characteristic approximates the gain value (target gain value) that specifies the target sound pressure frequency characteristic. This is done by adjusting the gain value. Specifically, it is performed by repeating a series of processes of pink noise output → sound collection by microphone → comparison of reproduction sound pressure frequency characteristic and target sound pressure frequency characteristic → equalizer parameter value (= gain value) change.

  However, since the sound signal for measurement such as pink noise is a noise signal for measuring the sound pressure frequency characteristic, whether or not the sound pressure frequency characteristic has actually changed when a human listens unlike normal music, or There is a problem that it is difficult to determine whether or not the reproduction sound pressure frequency characteristic has really become the same characteristic as the target sound pressure frequency characteristic.

  Therefore, an object of the present invention is to more appropriately present the adjustment work situation of the sound pressure frequency characteristic to the adjustment worker.

The sound pressure frequency characteristic adjusting device of the present invention, which has been made to solve the above-described problems, is a measurement sound signal generating means for generating a measurement sound signal (in the embodiment, a pink noise generating unit 28: in this column). In order to facilitate the understanding of the invention, the components described in the column “Best Mode for Carrying Out the Invention” are shown in parentheses as necessary, but this description should limit the scope of the claims. It is possible to change the sound pressure frequency characteristics of the measurement sound signal generated from the measurement sound signal generating means by changing the gain value for each frequency band divided into a plurality of frequency bands. An equalizer (15-band equalizer 25 in the embodiment);
Sound generation means (speaker 40 in the embodiment) that emits the output from the equalizer as an audible sound; sound input means (microphone 50 in the embodiment) that inputs the audible sound emitted from the sound generation means and converts it into an electrical signal; Analyzing means (frequency analyzing unit 27 in the embodiment) for analyzing a gain value for specifying a sound pressure frequency characteristic for each of the plurality of divided frequency bands based on an electric signal from the sound input means; Reproduction gain value storage means for storing the latest gain value (reproduction gain value) for specifying the sound pressure frequency characteristic in the reproduction sound field, which is an analysis result by the analysis means (in the embodiment, the sound processing unit 20). RAM 23) and target gain value storage means for storing a gain value (target gain value) for specifying a target sound pressure frequency characteristic for each of the frequency bands divided into a plurality of frequency bands. In the embodiment, the latest reproduction gain value stored in the hard disk storage device 14) of the main control unit 10 and the reproduction gain value storage means are compared with the target gain value stored in the target gain value storage means, and the reproduction gain value is obtained. Gain value change instructing means (in the embodiment, the CPU 11 of the main control unit 10 and the CPU 21 of the sound processing unit 20) for instructing the equalizer to change the gain value according to the difference between the two characteristics so as to match the target gain value. Both characteristics can compare the display means (display means 16 in the embodiment) with at least the latest reproduction gain value stored in the reproduction gain value storage means and the target gain value stored in the target gain value storage means. and display control means for displaying on the display means such (CPU 11 of the main control unit 10 in the embodiment), the latest reproduction gain stored in the reproduction gain value storage unit And a similarity ratio calculation means (CPU 11 of the main control unit 10 in the embodiment) for calculating a similarity ratio between the target gain value and the target gain value stored in the target gain value storage means. The calculated similarity is also displayed on the display means .

  According to the sound pressure frequency characteristic adjusting device of the present invention having such a configuration, when adjusting the sound pressure frequency characteristic by changing the gain value of the equalizer so that the reproduction gain value matches the target gain value, Since at least the latest reproduction gain value (current value shown in FIGS. 3 to 5 in the embodiment) and the target gain value (target values shown in FIGS. 3 to 5 in the embodiment) are displayed so as to be comparable, Recognizes whether the sound pressure frequency characteristic has really changed during the adjustment work, or whether it is approaching the same characteristic as the target target sound pressure frequency characteristic, even without expert knowledge. It becomes easy.

  Further, the gain value before correction may be displayed. In that case, the reproduction gain value storage means also stores the reproduction gain value before correction for which the correction instruction by the gain value correction instruction means has not been made. The display control means displays the stored reproduction gain value before correction (initial values shown in FIGS. 3 to 5 in the embodiment) so as to be comparable with the latest reproduction gain value and target gain value. It is displayed on the means. In this way, it is easy to recognize how much correction has been made from the state before correction during the adjustment work, even without expert knowledge.

Further , according to the sound pressure frequency characteristic adjusting apparatus of the present invention, the similarity is displayed to indicate how close the target gain value is . Specifically , the similarity ratio calculation means calculates the similarity ratio between the latest reproduction gain value stored in the reproduction gain value storage means and the target gain value stored in the target gain value storage means. The display control means also displays the calculated similarity ratio (82%, 94%, 100% in FIGS. 3A, 4A, and 5A in the embodiment) on the display means. is there.

  In this case, for example, not only the recent similarity ratio but also a predetermined number of similarity ratios before the recent similarity ratio calculation time may be displayed in a manner in which the calculation order can be visually recognized. For example, in an embodiment described later, as shown in FIG. 9, the similarity ratios 82%, 94%, and 100% calculated in the last three times are shown with arrows (↑) indicating the calculation order. By showing the progress of the change in the similarity rate, it is easy for the adjustment operator who sees it to grasp the degree of change in the similarity rate.

  It is also conceivable that the degree of similarity as well as the degree of similarity, that is, the degree of coincidence between the reproduction gain value and the target gain value, is displayed in a manner in which the magnitude of the degree of coincidence can be visually recognized. For example, in the embodiments described later, as shown in FIGS. 3 (a), 4 (a), and 5 (a), a blue, yellow, and red circle like a traffic signal is turned on together with a numerical value indicating a similarity rate. ing. Specifically, as shown in FIG. 3A, only red is lit when the similarity rate is 82%, and as shown in FIG. 4A, yellow is lit as well as red when the similarity rate is 94%. As shown above, red, yellow, and blue are all turned on at a similarity rate of 100%. In this embodiment, the rule is that only red is lit when less than 85%, yellow is lit when 85% or more and less than 95%, and blue is lit when 95% or more, and if the rule is understood, The adjustment operator can intuitively grasp the degree of similarity depending on what color is currently lit.

  Various methods for calculating the similarity ratio by the similarity ratio calculating means are conceivable. For example, the following may be considered. That is, the similarity ratio (division similarity ratio) between the latest reproduction gain value and the target gain value is calculated in units of gain values for each predetermined frequency band divided into a plurality. Then, among the divided similarity ratios for each frequency band, an average value of the top N pieces having a high ratio and the bottom N pieces having a low ratio is calculated as a similarity ratio. For example, assuming a gain value of 15 bands, the average value of the upper three and lower three divided similarity is calculated as the similarity.

  The intent of doing this is to prevent an inappropriately high similarity from being calculated by reducing the denominator when calculating the average value. For example, it is assumed that only one of 15 bands or only a relatively small number of divided similarities of about 2 to 3 bands is abnormally lower than the divided similarities of other bands. If averaged over the entire 15 bands, even if the fractional similarity of only those fractional bands is low, the low fractional similarity is not sufficiently reflected, and a high similarity is calculated as such. is there. Therefore, when there is a band that protrudes and has a low divided similarity, a calculation method is adopted in which the presence is reflected in the overall similarity.

The above is the description of the invention as the sound pressure frequency characteristic adjusting device, but such a sound pressure frequency characteristic adjusting device can be applied to various devices. For example, as described in claim 7 , the sound pressure frequency characteristic adjusting device described above, data storage means for storing music data (in the embodiment, the hard disk storage device 14 of the main control unit 10), and data storage means thereof As a music playback device comprising music playback means (in the embodiment, the CPU 11 of the main control unit 10, the CPU 21 of the sound processing unit 20 and the sound source unit 24) for playing back music based on the music data stored in the realizable.

The sound pressure frequency characteristic adjusting device according to claim 6 , wherein the analyzing means, gain value change instructing means, display control means, and similarity ratio calculating means included in the sound pressure frequency characteristic adjusting device are realized by a computer. It can also be understood as an invention as a program to be executed by a computer included in. Such a program is recorded on a computer-readable recording medium such as a flexible disk, a magneto-optical disk, a CD-ROM, a hard disk, a ROM, or a RAM, and is loaded into a computer for execution as necessary. These functions as each means can be realized by loading and executing the program.

  Embodiments to which the present invention is applied will be described below with reference to the drawings. The embodiments of the present invention are not limited to the following examples, and can take various forms as long as they belong to the technical scope of the present invention.

1 and 2 are block diagrams showing a configuration of a communication karaoke terminal 1 as an embodiment of a musical sound reproducing apparatus provided with a sound pressure frequency characteristic adjusting apparatus.
The communication karaoke terminal 1 of the present embodiment is connected to the distribution host device 100 via a telephone line 90, and is configured to receive distribution of various information such as music information from the distribution host device 100. . The communication karaoke terminal 1 and the distribution host device 100 may be connected via the Internet. Moreover, although only one communication karaoke terminal 1 is shown in FIGS. 1 and 2, a large number of communication karaoke terminals 1 are actually connected.

Since the communication karaoke terminal 1 includes the main control unit 10 and the voice processing unit 20 roughly, each will be described in turn.
[Configuration of Main Control Unit 10]
As shown in FIG. 1, the main control unit 10 sends a CPU 11 that controls the operation of the entire main control unit 10 to a ROM 12, a RAM 13, a hard disk storage device (HDD) 14, an operation unit 15, a display unit 16, A modem 17 is connected.

  The ROM 12 stores an activation program and the like necessary for activating the communication karaoke terminal 1. System programs, application programs, and the like that control the operation of the apparatus are stored in the hard disk storage device 14, and are read into the RAM 13 by the above-described startup program when the apparatus is turned on.

  The hard disk storage device 14 includes an area for storing the above-described program, an area for storing song data for performing karaoke performance, an area for storing target gain value data, an area for storing measured gain values, and the like. I have. The target gain value data is distributed from the distribution host device 100 described above.

  The operation unit 15 is provided on the front surface of the communication karaoke terminal 1 and includes a song code input switch, a key change switch, or a 7-segment LED for displaying an input song code or the like.

  The display means 16 combines and displays the lyrics data superimposed on the background video data included in the song data or stored separately in the hard disk storage device 14, for example, as shown in FIGS. This is used to display the adjustment state of various gain values. Of course, other contents can be displayed.

The modem 17 is connected to the distribution host device 100 via the telephone line 90.
[Configuration of Audio Processing Unit 20]
The voice processing unit 20 sends a ROM 21, a RAM 23, a MIDI sound source unit (hereinafter simply referred to as a sound source unit) 24, 15 band equalizer (hereinafter simply referred to as an equalizer) via a bus to a CPU 21 that controls the operation of the entire voice processing unit 20. 25), a DSP (digital signal processor) 1, DSP 2, and a pink noise generator 28 are connected. The DSP 2 includes a voice effect unit 26 and a frequency analysis unit 27, and an audio signal input via the microphone 50 is amplified by a microphone amplifier 51. The DSP 1 includes a music effect unit 29 and a 15-band equalizer 25.

  The CPU 21 of the audio processing unit 20 and the CPU 11 of the main control unit 10 are connected by USB (Universal Serial Bus). Therefore, the CPU 21 of the sound processing unit 20 acquires the target gain value data stored in the hard disk storage device 14 of the main control unit 10 via the CPU 11 of the main control unit 10 and stores it in the RAM 23 of the sound processing unit 20. Then, processing for correcting the gain value of the equalizer 25 is executed.

The ROM 22 stores an application program for controlling the operation of the sound processing unit 20.
The tone generator 24 forms a (digital) tone signal based on the tone track data of the song data. The song data is read from the hard disk storage device 14 by the CPU 21 of the voice processing unit 20 via the CPU 11 of the main control unit 10 during karaoke performance. The tone track is composed of a plurality of tracks, and the tone generator 24 forms a plurality of part tone signals simultaneously based on this data. Musical tone signals formed by the sound source unit 24 are karaoke performance sounds, which are input to the equalizer 25 via the music effect unit 29.

  The pink noise generating unit 28 generates so-called pink noise which is a measurement signal used for adjusting the sound pressure frequency characteristic. In this embodiment, pink noise is generated from a pink noise generating unit 28 different from the sound source unit 24. However, pink noise is generated from the sound source unit 24 and the pink noise generating unit 28 is not provided. May be.

  The equalizer 25 gives a predetermined acoustic effect to the karaoke performance sound. Specifically, the equalizer 25 divides the frequency band of 20 Hz to 20 kHz into 15 bands, and the sound of each frequency band. The gain value with respect to the pressure is changed in the range of −12 dB to +12 dB. The (digital) musical sound signal whose sound pressure frequency characteristic has been changed by the equalizer 25 is converted to an analog signal by the DA converter 42 and output to the speaker 40 which is an external device via the power amplifier 41.

  On the other hand, the singing voice signal or sound signal input from the singing microphone 50 which is an external device is amplified by the microphone amplifier 51 and converted into a digital signal via the AD converter 52, and the voice effect unit 26 and Input to the frequency analysis unit 27. The voice effect unit 26 gives an acoustic effect such as echo to the singing voice signal and outputs it. The singing voice signal output from the voice effect unit 26 is mixed with a musical sound signal corresponding to the karaoke performance sound output from the music effect unit 29 and output to the equalizer 25. It should be noted that the signal is not output from the voice effect unit 26 to the equalizer 25, that is, the sound signal input from the microphone 50 can be prevented from being output from the speaker 40. This is for the following reason. That is, when adjusting the sound pressure frequency characteristic of the reproduction sound field, so-called pink noise is generated from the pink noise generating unit 28, and the pink noise generated from the speaker 40 is input by the microphone 50 to the frequency analyzing unit 27. Frequency analysis. In this case, if the sound signal (pink noise) input by the microphone 50 is output from the speaker 40 again, inconvenience occurs. Therefore, when adjusting the sound pressure frequency characteristic, a signal is not output from the voice effect unit 26 to the speaker 40.

  The frequency analysis unit 27 performs frequency analysis on the input sound signal (pink noise) by FFT. In the present embodiment, like the 15 frequency bands in the equalizer 25, the frequency band of 20 Hz to 20 kHz is divided into 15 bands (bands), and the sound pressure in each frequency band is analyzed.

  In the communication karaoke system of the present embodiment, not only can the karaoke performance be performed at the communication karaoke terminal 1, but also the sound pressure frequency characteristics can be adjusted according to the environment in which the communication karaoke terminal 1 is installed. First, the necessity for such adjustment of the sound pressure frequency characteristic will be briefly described.

  In the online karaoke system, the actual situation is that the environment in which the online karaoke terminal 1 is installed to play and play music data is not uniform. Even if it is a karaoke box (room), the shape, size, and wall material are all different. For this reason, the sound pressure frequency characteristics (target sound pressure frequency characteristics) at the time of production of the music data and the sound pressure frequency characteristics (reproduction sound pressure frequency characteristics) in the playback environment such as in a karaoke box are greatly different. The sound condition intended by the creator cannot be reproduced sufficiently.

  Therefore, in this embodiment, gain value (target gain value) data for specifying the target sound pressure frequency characteristic is distributed from the distribution host device 100 to each communication karaoke terminal 1, and each communication karaoke terminal 1 actually uses the terminal. The pink noise is generated from the pink noise generating unit 28 in the environment where the noise is installed, the gain value indicating the sound pressure frequency characteristic in the reproduction sound field is measured, and the measured gain value (reproduction gain value) and the above-described target gain value are measured. Is changed (adjusted) to a value corresponding to the reproduction environment. That is, the gain value of the equalizer 25 is changed (adjusted) so that the reproduction gain value in a state where the sound value frequency characteristic specifying sound value frequency characteristic is adjusted by the equalizer 25 and the sound is generated matches the above-described target gain value. is there.

  However, the pink noise used to adjust the sound pressure frequency characteristics is different from normal music, and whether or not the gain value that actually identifies the sound pressure frequency characteristics has changed or the playback gain value is different. It is difficult to discriminate whether or not is actually in a state that matches or approximates the target gain value. Therefore, in the communication karaoke terminal 1 of the present embodiment, in order to more appropriately present the adjustment work situation of the sound pressure frequency characteristics to the adjustment worker, the display means 16 is shown in FIG. 3 (a), FIG. The screen is displayed as shown in FIG.

[Explanation of screen display example and similarity rate]
3 (a), 4 (a), and 5 (a) divide the frequency band from 20 Hz to 20 kHz into 15 bands (bands), and the target gain value (hereinafter referred to as the sound pressure) of each band. , Abbreviated as target value), initial value of reproduction gain value (hereinafter abbreviated as initial value), and current value of reproduction gain value (hereinafter abbreviated as current value). . The sound pressure is shown in a range of plus or minus 12 decibels (dB). In the figure, the thickest line is the target value, the next thick line is the initial value, and the part indicated by hatched hatching is the current value. FIG. 3A → FIG. 4A → FIG. 5A in order of the correction of the sound pressure frequency characteristics. FIGS. 3B, 4B, and 5B show the target value, initial value, and current value in the case of FIGS. 3A, 4A, and 5A, respectively. , And the gain value of the equalizer 25 are shown corresponding to each band. The gain value of the equalizer 25 is obtained by subtracting the initial value from the current value. In FIG. 3, the current value is the initial value.

  In this way, the current value and the target value are displayed so that they can be compared, so whether the sound pressure frequency characteristic has actually changed during the adjustment work, or the same as the target target sound pressure frequency characteristic. It becomes easy to recognize whether or not the characteristics are approaching even without specialized knowledge. Further, since the initial value is also displayed so as to be comparable with the target value and the current value, it is easy to recognize how much the initial value has been corrected from the initial state during the adjustment work even without expert knowledge.

  Further, on the right side of the graphs of FIGS. 3A, 4A, and 5A, a similarity rate between the target value and the current value (this similarity rate will be described in detail later). In addition to displaying numerical values (in this case,% display), display is also possible to visually grasp the degree of similarity. Specifically, a red, blue and yellow traffic signal is imitated, and a display mode is adopted in which less than 85% lights only red, 85% to less than 95% lights yellow, and more than 95% lights blue. did. Therefore, as shown in FIG. 3 (a), only red is lit when the similarity rate is 82%, and as shown in FIG. 4 (a), yellow is lit in addition to red when the similarity rate is 94%, as shown in FIG. 5 (a). When the similarity rate is 100%, red, yellow, and blue are all lit. In this way, the adjustment operator can intuitively grasp the degree of similarity depending on what color is currently lit. Of course, other display modes are possible. For example, a display mode in which less than 85% lights only red, 85% or more and less than 95% lights only yellow, and 95% or more lights only blue may be used. It may be blinking instead of lighting. By displaying in this way, it is possible to intuitively grasp whether the degree of similarity is high or low.

Now, the similarity between the target value and the current value will be described with reference to FIG.
First, the similarity (%) is expressed by the following equation using the divided similarity (%).

Similarity ratio = (total sum of N from the high value of the divided similarity ratio + total of N pieces from the low value of the divided similarity ratio) / 2N

Further, the division similarity (%) is expressed by the following equation using the target value and the current value corresponding to each band.

Division similarity = 100− (| target value−current value | × 100) / 25

Note that | target value−current value | is an absolute value obtained by subtracting the current value from the target value.

  FIG. 6A shows the target value, the current value, and the division similarity based on them. For example, when the target value is +4 and the current value is +8, the division similarity is 100− (| 4−8 | × 100) / 25 = 100−400 / 25 = 84 (%).

  When the divided similarity corresponding to each band is obtained in this way, the similarity is calculated based on the divided similarity as shown in FIG. In the above formula, for example, when N = 3, the three from the highest value of the division similarity are 100, 100, and 92, respectively. Also, the three from the lowest value of the division similarity are 68, 68, and 68, respectively. Therefore, the similarity ratio = (68 + 68 + 68 + 100 + 100 + 92) / (2 × 3) = about 82 (%).

  In this way, instead of calculating the similarity ratio using all of the 15-band divided similarity ratios, the intention is to calculate the similarity ratio using N pieces from the high value of the divided similarity ratio and N pieces from the low value of the divided similarity ratio. By reducing the denominator when calculating the average value, it is possible to prevent an inappropriately high similarity rate from being calculated. For example, it is assumed that only one of 15 bands or only a relatively small number of divided similarities of about 2 to 3 bands is abnormally lower than the divided similarities of other bands. Here, if averaging is performed over the entire 15 bands, even if the fractional similarity of only those fractional bands is low, the low similarity of division is not sufficiently reflected, and a high similarity is calculated accordingly. For example, (a) when all 15 bands have a similar similarity of 90%, and (b) when 14 bands have a similarity of 91% and only one of the remaining bands has a similarity of 76%, or (C) In the case where the divided similarity of 14 bands is 92% and only the divided similarity of the remaining one band is 62%, the average of all 15 bands is 90%. However, it is uncomfortable to have a high similarity rate even though there are divisional similarity rates of 62% and 76% as in (B) and (C). In other words, in the case of divided similarity ratios such as (b) and (c), although the degree of similarity is not so high as an adjustment operator, the same similarity ratio as (b) It is not preferable that is calculated.

  Therefore, when there is a band that protrudes and has a low divided similarity, it is preferable to employ a calculation method in which the presence is reflected in the overall similarity. For example, in the case of (b) above, the average value of the upper three and lower three divided similarity ratios is calculated to be 88.5%, and in the case of (c), the average value of the upper third and lower three divided similarity ratios is calculated. The calculation is 87%.

[Explanation of operations executed in the communication karaoke terminal 1]
Next, the operation | movement performed with the communication karaoke terminal 1 of a present Example is demonstrated. Here, a description will be given focusing on processing related to measurement and setting of sound pressure frequency characteristics.

  7 and 8 are flowcharts showing the first half and the second half of the processing related to the measurement and setting of the sound pressure frequency characteristic executed by the communication karaoke terminal 1, respectively. Since this process is executed by both the main control unit 10 and the audio processing unit 20 in cooperation, the left side of FIGS. 7 and 8 shows the process executed by the main control unit 10. On the right side, the processing executed by the voice processing unit 20 is shown.

  In S 10, the main control unit 10 reads the target value for 15 bands from the hard disk storage device 14 and stores it in the RAM 13. In the subsequent S20, the initial value of the 15-band reproduction gain value is requested to the audio processing unit 20.

  This request is transmitted to the CPU 21 of the audio processing unit 20 that is USB-connected to the CPU 11 of the main control unit 10. The audio processing unit 20 clears the gain value of the equalizer 25 in S210, and starts pink noise generation from the pink noise generation unit 28 in the next S220. The pink noise output from the pink noise generator 28 is generated from the speaker 40 via the equalizer 25, the DA converter 42, and the power amplifier 41. In this manner, the sound signal input from the microphone 50 in a state where the pink noise is output from the speaker 40 is input to the frequency analysis unit 27 via the microphone amplifier 51 and the AD converter 52. The frequency analysis unit 27 performs frequency analysis by FFT (S230). The frequency analysis unit 27 divides the input sound signal (pink noise) into a frequency band of 20 Hz to 20 kHz into 15 bands (bands) in the same manner as the 15 frequency bands in the equalizer 25, and each frequency band. Analyze the sound pressure. In addition, since the sound signal (pink noise) input by the microphone 50 is output from the speaker 40 again during the measurement / setting processing of the sound pressure frequency characteristics, inconvenience occurs. Is not output. When the predetermined time has elapsed, the generation of pink noise from the pink noise generator 28 is stopped (S240). The analysis result obtained from the frequency analysis unit 27, that is, the current value of the reproduction gain value is stored in the RAM 23 of the audio processing unit 20, and the CPU 21 of the audio processing unit 20 notifies the CPU 11 of the main control unit of the stop (S250). .

  The CPU 11 of the main control unit 10 determines whether or not there is a stop notification from the CPU 21 of the sound processing unit 20 (S30), and if there is a stop notification (S30: Y), the 15-band reproduction gain from the sound processing unit 20 The initial value is acquired and stored in the RAM 13 of the main control unit 10 (S40). In the next S50, the similarity is calculated from the target value read in S10 and the initial value stored in S40, and stored in the RAM 13. Since the calculation of the similarity has already been described with reference to FIG. 6, it is omitted here. In the next S60, the target value, the initial value, and the similarity rate are read from the RAM 13 and displayed on the display means 16. In this case, the display screen on the display means 16 is as shown in FIG. Since FIG. 3A has already been described, it will not be repeated here. In S70, the target value is sent to the voice processing unit 20 and the start of the correction process is requested.

  The audio processing unit 20 that receives the target value from the main control unit 10 and receives the correction processing start request stores the target value in the RAM 23 and clears the gain value of the equalizer 25 (S260). Then, generation of pink noise is started from the pink noise generation unit 28 (S270), the frequency analysis of the sound signal input from the microphone 50 is performed by the frequency analysis unit 27 (S280), and the analysis obtained from the frequency analysis unit 27 is performed. The result, that is, the current value of the reproduction gain value is stored in the RAM 23 of the sound processing unit 20 (S290). In next step S300, the target value is compared with the current value, the gain value is corrected by the equalizer 25, and the corrected gain value is stored in the RAM 23. Then, it is determined whether or not there is a stop request from the main control unit 10 (S300). If there is no stop request (S300: N), the process returns to S280 and repeats the processes of S280 to S300. Naturally, the current value and the gain value of the equalizer 25 change by performing the gain value correction by the equalizer 25 in S300 while repeating such processing.

  On the other hand, in S80, the main control unit 10 receives the current value of the 15-band reproduction gain value from the audio processing unit 20 in S80 (this is the current value stored in the RAM 23 of the audio processing unit 20 in S290 described above). ) And is stored in the RAM 13. In the next S90, the similarity is calculated from the target value read in S10 and the current value stored in S80, and stored in the RAM 13. Since the calculation of the similarity has already been described with reference to FIG. 6, it is omitted here. In the next S100, the target value, initial value, current value, and similarity rate are read from the RAM 13 and displayed on the display means 16. In this case, the display screen on the display means 16 is as shown in FIG. Since FIG. 4A has already been described, it will not be repeated here. In the next S110, it is determined whether or not a stop operation has been performed via the operation unit 15. If there is no stop operation, it returns to S80 and repeats the process of S80-S100. Note that if the current value stored in S290 changes, the similarity rate calculated in S90 and the current value read in S100 also change. If there is a stop operation (S110: Y), the process proceeds to S120, and the sound processing unit 20 is requested to stop the correction process.

  When there is a stop request from the main control unit 10 (S310: Y), the voice processing unit 20 stops the generation of pink noise from the pink noise generation unit 28 (S320). Then, the main control unit 10 is notified of the stop (S320).

  When receiving a stop notification from the audio processing unit 20 (S130: Y), the main control unit 10 acquires the current value of the 15-band reproduction gain value from the audio processing unit 20 and stores it in the RAM 13 (S140). In the next S150, the similarity is calculated from the target value read in S10 and the current value stored in S140, and stored in the RAM 13. Since the calculation of the similarity has already been described with reference to FIG. 6, it is omitted here. In the next S160, the target value, initial value, current value, and similarity rate are read from the RAM 13 and displayed on the display means 16. In this case, the display screen on the display means 16 is as shown in FIG. Since FIG. 5A has already been described, it will not be repeated here. In the next S170, the 15-band gain value of the equalizer 25 is acquired from the audio processing unit 20 and stored in the hard disk storage device 14.

By executing the processing as described above, the gain value in the equalizer 25 can be changed (adjusted) to a value according to the reproduction environment.
When the gain value is adjusted according to the reproduction environment in this way, the adjusted gain value is reflected when the communication karaoke terminal 1 is subsequently activated. That is, if the gain value is recorded in the hard disk storage device 14 in the activation process of the communication karaoke terminal 1, the gain value in the equalizer 25 is set as recorded in the hard disk storage device 14. If the karaoke mode is started in this manner, when the karaoke mode is played, the gain value in the equalizer 25 is adjusted in accordance with the reproduction environment, and “the sound quality that the data producer thinks is optimum” Karaoke performance in a state that matches or approximates the target gain value for specifying the sound pressure frequency characteristic that is the optimum sound quality set in “Environment used for determination” will be realized.

[Another embodiment]
(1) In the above embodiment, as shown in FIGS. 3A, 4A, and 5A, the similarity between the target value and the current value is 82%, 94%, 100%, and so on. Is shown numerically. In this case, only the similarity rate corresponding to the current value is shown. For example, a predetermined number of similarity rates before the latest similarity rate calculation time are displayed in a manner in which the calculation order is visually recognizable. Also good. For example, as shown in FIG. 9, it is conceivable that the similarity ratios 82%, 94%, and 100% calculated in the last three times are indicated together with arrows (↑) indicating the calculation order. By showing the progress of such a change in the similarity rate, an adjustment operator who sees it can easily grasp the degree of change in the similarity rate.

In this case, at least the latest three similarities may be stored in the RAM 13 of the main control unit 10.
(2) In the above embodiment, the main control unit 10 and the audio processing unit 20 have CPUs respectively, and the CPU 11 of the main control unit 10 and the CPU 21 of the audio processing unit 20 are connected by USB. The entire communication karaoke terminal 1 may be controlled by a single CPU.

  (3) In the above embodiment, the frequency analysis unit 27 performs frequency analysis using FFT in order to grasp the sound pressure frequency characteristics. However, instead of using FFT, for example, a band pass filter and a peak value detector may be provided for each band, and the sound pressure frequency characteristic may be measured at the peak value of each band.

  (4) In the above embodiment, as shown in S110 of FIG. 8, it is determined whether or not there has been a stop operation via the operation unit 15, and if there has been a stop operation (S110: Y), the process proceeds to S120. Thus, the audio processing unit 20 is requested to stop the correction process. However, instead of such manual operation, for example, the process may proceed to S120 when a predetermined time has elapsed.

  (5) In the above embodiment, the example realized as a communication karaoke terminal has been described. However, the present invention can be applied to various devices as long as the sound pressure frequency characteristics need to be adjusted.

It is a block diagram which mainly shows the structure of the main control part 10 of the communication karaoke terminal 1 as one Example of a musical tone reproduction apparatus. It is a block diagram which mainly shows the structure of the audio | voice processing part 20 of the communication karaoke terminal 1 of an Example. It is explanatory drawing of the display screen which shows the adjustment work condition in the case of performing sound pressure frequency characteristic adjustment. It is explanatory drawing of the display screen which shows the adjustment work condition in the case of performing sound pressure frequency characteristic adjustment. It is explanatory drawing of the display screen which shows the adjustment work condition in the case of performing sound pressure frequency characteristic adjustment. It is explanatory drawing about the similarity rate of a target value and a present value. It is a flowchart which shows the first half of the process which concerns on the measurement and setting of a sound pressure frequency characteristic. It is a flowchart which shows the second half of the process which concerns on the measurement and setting of a sound pressure frequency characteristic. It is explanatory drawing of another example of the display screen which shows an adjustment work condition.

  DESCRIPTION OF SYMBOLS 1 ... Communication karaoke terminal, 10 ... Main control part, 11 ... CPU, 12 ... ROM, 3 ... RAM, 14 ... Hard disk storage device, 15 ... Operation part, 16 ... Display means, 17 ... Modem, 120 ... Audio | voice processing part, 21 ... CPU, 22 ... ROM, 23 ... RAM, 24 ... MIDI sound source unit, 25 ... (15 band) equalizer, 26 ... voice effect unit, 27 ... frequency analysis unit, 28 ... pink noise generation unit, 29 ... music effect unit , 40 ... speaker, 41 ... power amplifier, 42 ... DA converter, 50 ... microphone, 51 ... microphone amplifier, 52 ... AD converter, 90 ... telephone line, 100 ... host device for distribution.

Claims (7)

A measurement sound signal generating means for generating a measurement sound signal;
An equalizer capable of changing a sound pressure frequency characteristic of a measurement sound signal generated from the measurement sound signal generating means by changing a gain value for each frequency band divided into a plurality of;
A sounding means for emitting the output from the equalizer as an audible sound;
Sound input means for inputting an audible sound emitted from the sound generation means and converting it into an electrical signal;
Based on an electrical signal from the sound input means, an analysis means for analyzing a gain value for identifying a sound pressure frequency characteristic for each of the plurality of divided frequency bands;
Reproduction gain value storage means for storing at least a gain value (hereinafter referred to as a reproduction gain value) for specifying a sound pressure frequency characteristic in a reproduction sound field, which is an analysis result by the analysis means, and storing the latest one. ,
A target gain value storage means for storing a gain value (hereinafter referred to as a target gain value) for specifying a target sound pressure frequency characteristic for each of the plurality of divided frequency bands;
The latest reproduction gain value stored in the reproduction gain value storage means is compared with the target gain value stored in the target gain value storage means, and both gains are set so that the reproduction gain value matches the target gain value. Gain value change instructing means for instructing the equalizer to change the gain value according to the value difference;
Display means;
Display control for displaying at least the latest reproduction gain value stored in the reproduction gain value storage means and the target gain value stored in the target gain value storage means on the display means so that both characteristics can be compared. Means,
A similarity ratio calculating means for calculating a similarity ratio between the latest reproduction gain value stored in the reproduction gain value storage means and the target gain value stored in the target gain value storage means,
The sound pressure frequency characteristic adjusting apparatus , wherein the display control means causes the display means to also display the similarity rate calculated by the similarity rate calculation means . In the sound pressure frequency characteristic adjusting device according to claim 1,
The reproduction gain value storage means further stores a reproduction gain value before correction that is not instructed by the gain value correction instruction means,
The display control means causes the display means to display the uncorrected reproduction gain value stored in the reproduction gain value storage means so as to be comparable with the latest reproduction gain value and the target gain value. A sound pressure frequency characteristic adjusting device characterized by the above. The sound pressure frequency characteristic adjusting device according to claim 1 or 2,
The display control means displays a predetermined number of similarity ratios calculated by the similarity ratio calculation means before a recent similarity ratio calculation time in a manner in which the calculation order is visually recognizable. Sound pressure frequency characteristic adjustment device. In the sound pressure frequency characteristic adjusting device according to any one of claims 1 to 3 ,
The display control means also displays the degree of coincidence between the reproduction gain value obtained based on the latest similarity ratio and the target gain value in such a manner that the degree of coincidence can be visually recognized. A characteristic sound pressure frequency characteristic adjusting device. In the sound pressure frequency characteristic adjusting device according to any one of claims 1 to 4 ,
The similarity calculation means
A similarity ratio between the latest reproduction gain value and the target gain value (hereinafter referred to as a divided similarity ratio) is calculated in units of gain values for each of the predetermined frequency bands divided into a plurality of frequency bands. The sound pressure frequency characteristic adjusting device is characterized in that an average value of the top N pieces having a high rate and the low order N pieces having a low rate is calculated as the similarity rate . 6. The measurement sound signal generating means, equalizer, sound input means, analysis means, reproduction gain value storage means, target gain value storage means, gain value change instruction means, display means, display according to claim 1 In the sound pressure frequency characteristic adjusting apparatus including the control means and the similarity ratio calculating means, a program executed by a computer included in the sound pressure frequency characteristic adjusting apparatus,
A program for causing the computer to function as the analysis unit, the gain value change instruction unit, the display control unit, and the similarity calculation unit included in the sound pressure frequency characteristic adjustment device according to any one of claims 1 to 5 . The sound pressure frequency characteristic adjusting device according to any one of claims 1 to 5 ,
Data storage means for storing music data;
A music playback device comprising: music playback means for playing back music based on the music data stored in the data storage means.