JP2015049470A - Signal processor and program for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a signal processor which can adjust a level of part (a musical instrument and voice) included in a sound signal.SOLUTION: A level of sound of a part included in a sound signal reaches a peak by a prescribed frequency every part. Then, a part extraction part extracts a part included in the sound signal on the basis of a peak component on a frequency axis. The part extraction part extracts a sound signal by a bandpass filter corresponding to the frequency of specific vibration (fundamental tone and harmonic tone) every part, for example, and when the level of frequencies of the fundamental tone and the harmonic tone is equal to prescribed threshold or higher, extracts the part as the part is included in the sound signal. A display part displays a part operator corresponding to the extracted part. A level adjustment part adjusts the level of frequency of the extracted part on the basis of operation of the part operator received by the operation part.

Description

  The present invention relates to a signal processing apparatus that adjusts and outputs the level of an input audio signal for each frequency and a program thereof.

  2. Description of the Related Art Conventionally, an equalizer device that adjusts the level of an audio signal for each frequency band to make an input audio signal have a desired frequency characteristic is known (see Patent Document 1).

JP 2006-211508 A

  However, the equalizer device shown in Patent Document 1 only displays an operator associated with a frequency. Therefore, in the equalizer device disclosed in Patent Document 1, for example, when the user does not know the frequency of the musical instrument even when trying to emphasize the sound of the specific musical instrument, the level of the frequency corresponding to the musical instrument cannot be adjusted.

  Therefore, an object of the present invention is to provide a signal processing apparatus that can adjust the sound level of parts (instrument and voice) included in an audio signal.

  The signal processing apparatus of the present invention includes an input unit to which an audio signal is input, a part extraction unit that extracts a part from an audio signal input to the input unit based on a peak component of frequency, and the part extraction unit includes Corresponding to each part based on a display unit that displays a part operator for level adjustment for each extracted part, an operation unit that receives an operation input to the part operator, and an operation input received by the operation unit And a level adjustment unit for adjusting the level of the frequency to be performed.

  The sound of the parts (instrument and voice) included in the audio signal peaks at a predetermined frequency for each part. Therefore, the part extraction unit extracts a part included in the audio signal based on the peak component on the frequency axis. For example, the part extraction unit extracts an audio signal with a bandpass filter corresponding to the frequency of the natural vibration (fundamental sound and harmonics) for each part, and the level of the fundamental and harmonic frequencies of the extracted audio signal is equal to or higher than a predetermined threshold. If there is, the part is extracted as being included in the audio signal.

  The display unit displays a part operator corresponding to the extracted part. The level adjustment unit adjusts the frequency level of the extracted part based on the operation on the part operation element received by the operation unit. Since the part operator indicating the part is displayed on the signal processing device, the user can intuitively adjust the frequency level of the part.

  The level adjustment unit may adjust the frequency level of the fundamental tone and the harmonic overtone for each part.

  The sound of an instrument mainly consists of a fundamental tone and a harmonic overtone. The voice mainly consists of first to third formant frequency components. The level adjustment unit performs level adjustment not only on the fundamental tone (first formant frequency component) but also on the harmonics (second and subsequent formant frequency components). As a result, the ratio between the level of the fundamental (first formant frequency component) of the part and the level of the harmonic (second and subsequent formant frequency components) included in the audio signal is maintained, and the timbre of each part does not change. . Therefore, the signal processing apparatus can enhance or attenuate the sound of each part while preventing a change in the timbre of each part.

  In addition, the signal processing device includes a display position determining unit that determines a display position for each part based on the extraction result by the part extracting unit, and the display unit is set at the display position determined by the display position determining unit. The part operator may be displayed.

  The display position determination unit determines the display position of the part operator by, for example, obtaining the level ratio of the audio signals of the L and R channels for the extracted part frequency. However, the display position determination unit may determine a predetermined display position according to the extracted part.

  In addition, the signal processing device includes a level detection unit that detects a level for each part extracted by the part extraction unit, and the level adjustment unit uses the level for each part detected by the level detection unit and the operation input. Based on this, the level adjustment amount may be controlled.

  For example, the level adjustment unit adjusts the frequency level of the part when the level detected by the level detection unit is equal to or greater than a predetermined threshold. The level adjustment unit adjusts the level even when the sound of the part is low, and does not adjust the level of the sound of other parts included in the same band as the part.

  The present invention is not limited to the apparatus, and may be a program that realizes the functions of the input unit, part extraction unit, operation unit, and level adjustment unit.

  According to the present invention, since the signal processing apparatus displays the part operator indicating the extracted part and adjusts the level based on the operation on the part operator, the user does not know the frequency of the part whose level is to be adjusted. Even so, the sound level of the part can be adjusted.

It is a figure which shows a part of block diagram of the signal processing apparatus 1 which concerns on Embodiment 1. FIG. (A) is a figure which shows the frequency characteristic of the sound of a contrabass, (B) is a figure which shows the data memorize | stored in part DB22. (A) And (B) is a figure which shows the example of the image which the display 24 displays, respectively. 3 is a block diagram of a level adjustment unit 12. FIG. 10 is a block diagram of a band level adjustment unit 100A according to a modification of the band level adjustment unit 100. FIG. 6 is a block diagram of a signal processing device 2 according to Embodiment 2. FIG. (A) And (B) is a figure which shows the example of the image which the display 24 of the signal processing apparatus 2 which concerns on Embodiment 2 displays, respectively. It is a block diagram of level adjustment part 12LB, 12RB which concerns on the modification of level adjustment part 12L, 12R.

  A signal processing apparatus 1 according to the first embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a diagram illustrating a part of a block diagram of a signal processing device 1 according to the first embodiment. FIG. 2A is a diagram showing the frequency characteristics of the contrabass sound (relationship between frequency and level), and FIG. 2B is a diagram showing data stored in the part DB 22. 3A and 3B are diagrams showing examples of images displayed on the display 24, respectively. FIG. 4 is a block diagram of the level adjustment unit 12. However, in FIG. 1 and FIG. 4, the solid arrow indicates the flow of the audio signal, and the dotted arrow indicates the flow of the control signal.

  The signal processing apparatus 1 adjusts the level of an input audio signal for each frequency. The signal processing apparatus 1 includes a GUI (Graphical User Interface) in order to allow the user to perform level adjustment operations.

  As shown in FIG. 1, the signal processing device 1 includes an input unit 11, a level adjustment unit 12, an output unit 13, a voice analysis unit 21, a part DB 22, a control unit 23, a display 24, and a touch panel 25.

  The control unit 23 controls each functional unit of the signal processing device 1.

  The display 24 displays an image according to control from the control unit 23. The touch panel 25 receives an operation from the user. The control unit 23 changes the display content of the display 24 based on the user operation received through the touch panel 25. In this way, the signal processing device 1 realizes the GUI.

  The input unit 11 receives an audio signal. The audio signal is given from the outside of the signal processing apparatus 1. For example, the audio signal is given to the input unit 11 from a content player or a microphone (not shown). Note that the audio signal may be either a digital signal or an analog signal.

  The audio signal input to the input unit 11 is input to the level adjustment unit 12 and the audio analysis unit 21.

  The voice analysis unit 21 analyzes an input voice signal and extracts a part included in the voice signal. A part is a musical instrument and a voice.

  Various methods can be used as the part extraction method. In this embodiment, the frequency characteristic of the input audio signal is determined by determining whether or not the frequency characteristic condition of the sound of each part is met. Do.

  In general, the sound and voice of a musical instrument have frequency characteristics in which the level peaks at a predetermined frequency. For example, as shown in FIG. 2A, the level of the sound of the contrabass peaks at the fundamental frequency of 200 Hz, the frequency of the second harmonic 400 Hz, and the frequency of the third harmonic 600 Hz. However, the example shown in FIG. 2A is simply shown for explanation, and does not show the actual frequency characteristics of the contrabass.

  Therefore, for example, as shown in FIG. 2B, the part DB 22 associates three bands B1 to B3, a level threshold value, and a main band for each part, and the frequency characteristics of the sound of each part. Remember as a condition. The band B1 is set to include the fundamental frequency (first formant frequency) of the part. The band B2 is set so as to include the frequency of the second overtone of the part (second formant frequency). The band B3 is set so as to include the frequency of the third overtone of the part (third formant frequency). The level threshold is a threshold for the power of the three bands B1 to B3 of the part sound (the total value of the levels of the bands B1 to B3). The main band will be described later. However, the number of parts stored in the part DB 22 is not limited to four.

  For example, the voice analysis unit 21 performs Fourier transform on the input voice signal in order to obtain the frequency characteristics of the input voice signal. Thereby, the level for every frequency of the input audio | voice signal is calculated | required.

  When the sound analysis unit 21 obtains the frequency characteristic of the input sound signal, the sound analysis unit 21 reads the frequency characteristic condition of the sound of the part from the part DB 22, and the frequency characteristic of the input sound signal matches the frequency characteristic condition of the sound of the part. Judgment whether or not to perform, and extract the part. The following example is an explanation for extracting a contrabass.

  First, the voice analysis unit 21 reads the three bandwidths B1 to B3 and the level threshold value of the contrabass from the part DB 22. When the voice analysis unit 21 reads the three bandwidths B1 to B3 and the level threshold value of the contrast bus from the part DB 22, the voice analysis unit 21 obtains the levels of the three bandwidths B1 to B3 in the input voice signal. Then, the voice analysis unit 21 compares the obtained total value of the three levels (contrabass power) with the level threshold of the contrabass. If the power of the contrabass is equal to or greater than the level threshold of the contrabass, the voice analysis unit 21 determines that the contrabass part is included in the input audio signal. If the power of the contrabass is less than the level threshold value, the speech analysis unit 21 determines that the contrabass part is not included in the input speech signal.

  Note that the level threshold need not be different for each part, and may be set to the same value for each part.

  As described above, the voice analysis unit 21 extracts the contrabass as a part included in the voice signal. The voice analysis unit 21 performs the same extraction process as the extraction of the contrabass for the other parts (female voice, cymbal, and trumpet) stored in the part DB 22.

  When the voice analysis unit 21 extracts a part included in the input voice signal, the voice analysis unit 21 outputs the extracted part to the control unit 23.

  When the part extracted from the voice analysis unit 21 is input, the control unit 23 causes the display 24 to display an image for allowing the user to perform a level adjustment operation, as illustrated in FIG. More specifically, as shown in FIG. 3A, the control unit 23 displays the horizontal axis as a frequency and the vertical axis as a level. The control unit 23 displays the operation elements 301 to 310 and the part operation elements 401 to 403 in addition to the display of the frequency axis and the level axis. The positions of the operators 301 to 310 in the frequency axis direction are set in advance. As an initial state, the control unit 23 displays the operators 301 to 310 at the level 0 position.

  The control unit 23 causes the display 24 to display the parts extracted by the voice analysis unit 21 as the part operators 401 to 403. The display positions in the frequency axis direction of the part operators 401 to 403 are the main bands of the corresponding parts. The main band is a band where the sound level of the part is highest. As shown in FIG. 2B, the main band is stored in, for example, the part DB 22, and any one of the part bands B1 to B3 is set. The display positions in the level axis direction of the part operators 401 to 403 are positions where the level is 0 as an initial state.

  Each of the part operators 401 to 403 is displayed as an image indicating a part. An image indicating a part is stored in, for example, the part DB 22 and is obtained by the control unit 23 referring to the part DB 22.

  For example, the part operator 401 is displayed at a position corresponding to the bandwidth B1 (150 Hz to 250 Hz) of the contrabus in the example shown in FIG. The part operator 401 is displayed as an image showing a contrabass. Part operation element 402 is displayed at a position corresponding to female voice band B1 (500 Hz to 700 Hz). The part operation element 402 is displayed as an image showing a female voice. The part operation element 403 is displayed at a position corresponding to the band B3 (10 kHz to 14 kHz) of the cymbal. The part operator 403 is displayed as an image showing a cymbal.

  The user performs level adjustment operations on the operators 301 to 310 and the part operators 401 to 403 displayed on the display 24. The user performs an operation of designating the level adjustment amount by moving the operation elements 301 to 310 and the part operation elements 401 to 403 along the level axis direction. The level adjustment operation is accepted by the touch panel 25.

  Based on the operated part operators 401 to 403 and the movement amounts of the part operators 401 to 403, the control unit 23 obtains three frequency bands to be level-adjusted and a level adjustment amount. Specifically, the control unit 23 specifies a part corresponding to the operated part operation elements 401 to 403. The control unit 23 obtains three frequency bands whose levels should be adjusted based on the frequency characteristics of the sound of the identified part. In the present embodiment, the three frequency bands to be level-adjusted are set to the same bands as the specified part bands B1 to B3, respectively. That is, the three frequency bands to be level-adjusted are obtained by the control unit 23 referring to the part DB 22. The control unit 23 obtains a level adjustment amount according to the movement amount of the operated part operation elements 401 to 403. However, the three frequency bands to be level adjusted may include the center frequencies of the fundamental tone and the harmonic overtone, and may be wider than the bands B1 to B3, respectively, or may be narrower than the bands B1 to B3.

  For example, in the example shown in FIG. 3A, when the part operation element 402 indicating a female voice is operated, the control unit 23 refers to the part DB 22, and the female voice band B <b> 1 (500 Hz to 700 Hz), the band B <b> 2 ( 1 kHz to 1.4 kHz) and band B3 (1.7 kHz to 2 kHz) are obtained as three frequency bands to be level-adjusted.

  Then, the control unit 23 gives the female voice bands B1 to B3 to the level adjustment unit 12 together with the level adjustment amount.

  As shown in FIG. 4, the level adjustment unit 12 includes two band level adjustment units 100 and a synthesis unit 200. Each band level adjustment unit 100 includes an extraction unit 101 and a gain adjustment unit 102. However, the level adjustment unit 12 is not limited to two, and may include one or three or more band level adjustment units 100.

  The audio signal input to the level adjustment unit 12 is input to the synthesis unit 200 and each band level adjustment unit 100.

  The band level adjustment unit 100 extracts a band to be level-adjusted, and adjusts the level of the audio signal in the band extracted with a gain corresponding to the level adjustment amount of the band. The level-adjusted audio signal is synthesized by the synthesis unit 200 with the audio signal input to the level adjustment unit 12. In this way, the band level adjustment unit 100 adjusts the level of the band to be level adjusted.

  More specifically, the audio signal input to the band level adjustment unit 100 is input to the extraction unit 101. The extraction unit 101 extracts and outputs the female voice bands B1 to B3 given by the control unit 23 from the input voice signal. The audio signal output from the extraction unit 101 is input to the gain adjustment unit 102. The gain adjustment unit 102 outputs an audio signal whose level is adjusted with a gain corresponding to the level adjustment amount given from the control unit 23. The audio signal output from the gain adjustment unit 102 is input to the synthesis unit 200.

  Then, the level of the band B1 (500 Hz to 700 Hz), the band B2 (1 kHz to 1.4 kHz), and the band B3 (1.7 kHz to 2 kHz) corresponding to the female voice is adjusted in the audio signal input to the level adjustment unit 12. Is done.

  Thus, since the signal processing apparatus 1 adjusts the level of the first to third formant frequencies of the female voice at the same time, only the female voice can be emphasized or attenuated.

  As described above, since the frequency 500 Hz, the frequency 1 kHz, and the frequency 2 kHz are included in the bands B1 to B3 corresponding to the female voice, the control unit 23, as shown in FIG. The display positions in the level axis direction of the controls 305, 306, and 307 corresponding to 1 kHz and the frequency of 2 kHz may be changed.

  Note that the control unit 23 gives the level adjustment unit 12 the band B including the frequency corresponding to the operated operation unit and the level adjustment amount even when the operation units 301 to 310 are operated. That is, when the operators 301 to 310 are operated, the signal processing apparatus 1 adjusts the level of only the band B corresponding to the operators 301 to 310.

  The level adjustment unit 12 outputs the audio signal whose level is adjusted for each frequency band to the output unit 13. The output unit 13 outputs an audio signal whose level has been adjusted to the outside of the signal processing apparatus 1. When outputting the audio signal, the output unit 13 may perform digital-analog conversion or amplify the audio signal according to the output destination.

  As described above, the signal processing apparatus 1 displays the part operators 401 to 403 with images indicating the parts. Then, when the part operators 401 to 403 are operated, the signal processing apparatus 1 adjusts the sound level of the corresponding part. Therefore, the user can intuitively adjust the sound level of the part using the part operators 401 to 403 indicating the displayed part without knowing the fundamental and overtone frequencies of the part whose level is to be adjusted. it can.

  The level adjustment amount may be set to a different value for each part band B1 to B3. For example, the level adjustment amount for the bands B2 and B3 may be smaller than the level adjustment amount for the band B1, or may be larger than the level adjustment amount for the band B1. Further, the level adjustment amount for the bands B1 to B3 may be set according to the overtone structure of the part.

  In addition, the control unit 23 may be configured to provide two bands B1 and B2 to the level adjustment unit 12 instead of the three bands B1 to B3, or may be configured to provide four or more bands. Absent. Further, the control unit 23 may be configured to give only one main band to the level adjustment unit 12.

  In the above-described example, the control unit 23 provides the level adjustment unit 12 with the three bands B1 to B3 of the extracted part. However, the extracted part itself is provided to the level adjustment unit 12. It doesn't matter. In the case where the extracted part itself is given, the level adjustment unit 12 includes a band level adjustment unit 100 associated with each part. In this case, when the extraction unit 101 of the band level adjustment unit 100 is preset with the band B1 to B3 of the predetermined part, and the gain adjustment unit 102 receives the extracted part from the control unit 23, the gain adjustment function Activate.

  The functions of the input unit 11, the level adjustment unit 12, the output unit 13, the voice analysis unit 21, and the control unit 23 are not limited to hardware, and may be realized by software. That is, the above-described processing can be realized by programming the processing of these functional units and storing them in a storage medium, and reading and executing the program by a computing unit (computer or the like).

  Next, a band level adjustment unit 100A according to a modification of the band level adjustment unit 100 will be described with reference to FIG. FIG. 5 is a block diagram of the band level adjustment unit 100A.

  The band level adjustment unit 100A detects the levels of the bands B1 to B3 of the input audio signal, and when the levels of the bands B1 to B3 are equal to or higher than a predetermined threshold, the levels of the bands B1 to B3 of the input audio signal Is different from the band level adjustment unit 100 in that the level adjustment is not performed when the levels of the bands B1 to B3 are less than a predetermined threshold. A description of the same configuration as that of the band level adjustment unit 100 is omitted.

  The band level adjustment unit 100A includes an extraction unit 101, a gain adjustment unit 102, and a detection unit 103.

  The audio signal extracted by the extraction unit 101 is input to the gain adjustment unit 102 and the detection unit 103. The detection unit 103 detects the level of the input audio signal. When the level is less than the predetermined threshold, the detection unit 103 performs control to set the gain of the gain adjustment unit 102 to 0 regardless of the control of the control unit 23. When the gain of the gain adjustment unit 102 is set to 0, the audio signal input to the level adjustment unit 12 is output from the level adjustment unit 12 while maintaining the level in the band extracted by the extraction unit 101.

  The gain adjustment unit 102 amplifies the audio signal with the gain input from the control unit 23 when the level detected by the detection unit 103 is greater than or equal to a predetermined threshold.

  The band level adjustment unit 100A is used, for example, when it is desired to adjust the level only when the part sound is loud. As a result, the band level adjustment unit 100A adjusts the level of the sound of other parts included in the same band as the part by adjusting the level even when the sound of the part is low or when the sound of the part is not included. There is no end.

  Note that the detection unit 103 may adjust the gain of the gain adjustment unit 102 according to the detected level, instead of turning the gain adjustment unit 102 on and off.

  Next, the signal processing apparatus 2 according to the second embodiment will be described with reference to FIGS. FIG. 6 is a diagram illustrating a part of a block diagram of the signal processing device 2. 7A and 7B are diagrams illustrating examples of images displayed on the display 24, respectively.

  The signal processing apparatus 2 according to the second embodiment is different from the signal processing apparatus 1 in that the audio signals of the L and R channels are input and the level is adjusted for each audio signal. A description of the same configuration as that of the signal processing device 1 is omitted.

  As shown in FIG. 6, the signal processing device 2 includes an input unit 11A, a level adjustment unit 12A, an output unit 13A, a voice analysis unit 21A, a part DB 22, a control unit 23, a display 24, and a touch panel 25.

  The input unit 11A is different from the input unit 11 in that the audio signals of the L and R channels are input and the audio signal of each channel is output. The output unit 13A is different from the output unit 13 in that the audio signals of the L and R channels are input and the audio signal of each channel is output.

  The level adjustment unit 12A includes level adjustment units 12L and 12R. The level adjustment unit 12L adjusts the level of the L channel audio signal. The level adjuster 12R adjusts the level of the R channel audio signal. The configuration of the level adjustment units 12L and 12R is the same as that of the level adjustment unit 12.

  The voice analysis unit 21A is different from the voice analysis unit 21 in that it analyzes a synthesized voice signal obtained by synthesizing the L and R channel voice signals and extracts a part included in the synthesized voice signal.

  The sound analysis unit 21A further obtains the position of the part in the left-right direction in the virtual space based on the extracted L channel component and R channel component of the part. For example, the audio analysis unit 21A measures the level of the L channel audio signal and the level of the R channel audio signal in the three bands B1 to B3 of the extracted part. Then, the voice analysis unit 21A obtains a time average of the two measured levels. Here, for the three bands B1 to B3 of the extracted part, the average level of the L channel audio signal is AveL, and the average level of the R channel audio signal is AveR.

  For example, AveL vs. AveR is 1: 9 for the bandwidths B1 to B3 of the contrabus. In this case, the control unit 23 displays the part operator 401 indicating the contrabass at a position obtained by dividing the width of the display area of the display 24 by 1: 9 from the right side. For example, AveL vs. AveR is 5: 5 for female voice bands B1 to B3. In this case, the control unit 23 displays the part operation element 402 indicating a female voice at a position obtained by dividing the width of the display area of the display 24 by 5: 5 from the right side. For example, AveL vs. AveR is 8: 2 for cymbal bands B1 to B3. In this case, the control unit 23 displays a part operation element 403 indicating a cymbal at a position obtained by dividing the width of the display area of the display 24 by 8: 2 from the right side.

  In addition, the control unit 23 displays the virtual space on the display 24 while imitating the virtual space. However, an image simulating the stage is stored in the part DB 22, for example. Then, the display 24 performs display with the horizontal axis as the horizontal position on the stage and the vertical axis as the level.

  Then, the display 24 displays the part operators 401 to 403 so as to imitate each part existing on the stage as shown in FIG. 7A. In the example shown in FIG. 7A, for example, the part operator 401 is displayed on the right side of the stage, the part operator 402 is displayed at the center of the stage, and the part operator 403 is displayed on the left side of the stage.

  Then, as shown in FIG. 7B, when the part operators 401 to 403 are moved along the vertical direction, the control unit 23 controls the band of the part corresponding to the operated part operators 401 to 403. The level of each audio signal is adjusted by giving B1 to B3 and the level adjustment amount to the level adjustment units 12L and 12R.

  Note that the positions of the part operators 401 to 403 in the left-right direction on the stage may be set to a predetermined position instead of being determined by the ratio of AveL and AveR. The predetermined position is stored in the part DB 22, for example.

  Further, the signal processing device 2 is not limited to the L and R channels, and may be an aspect that extracts parts from multi-channel audio signals. Further, the signal processing device 2 calculates, for example, the average level of the front L channel audio signal and the average level of the surround L channel audio signal for the extracted part bands B1 to B3, respectively. The position of the operation element in the depth direction may be obtained and displayed on the display 24.

  In addition, the signal processing device 2 does not extract the part from the synthesized audio signal of the L and R channel audio signals, but extracts the part for each channel and displays the part operators 401 to 403 on the display 24. The level of the audio signal may be adjusted for each channel. In this case, the control unit 23 displays the part operators 401 to 403 with the horizontal axis as the frequency, as in the example of FIG.

  Next, level adjusting units 12LB and 12RB according to a modification of the level adjusting units 12L and 12R will be described with reference to FIG. FIG. 8 is a block diagram of the level adjustment units 12LB and 12RB.

  The level adjusting units 12LB and 12RB are different from the level adjusting units 12L and 12R in that they include two band level adjusting units 100B and a combining unit 200. The band level adjustment unit 100B is different from the band level adjustment unit 100 in that a channel adjustment unit 104 is provided between the gain adjustment unit 102 and the synthesis unit 200. That is, the level adjustment units 12LB and 12RB use the set of the channel adjustment unit 104 of the level adjustment unit 12LB and the channel adjustment unit 104 of the level adjustment unit 12RB, so that the level ratio between the L and R channels is set for each part. To be adjusted.

  The channel adjustment unit 104 adjusts and outputs the level of the audio signal with the gain input from the control unit 23. The gain of the channel adjustment unit 104 is set based on the ratio of AveL and AveR obtained by the voice analysis unit 21A. For example, if the AveL vs. AveR is 1: 9 for the bandwidth B1 to B3 of the contrast bus, the gain of the channel adjustment unit 104 of the bandwidth level adjustment unit 100B corresponding to the contrast bus of the level adjustment unit 12LB and the level adjustment unit The ratio with the gain of the channel adjustment unit 104 of the band level adjustment unit 100B corresponding to the 12 RB contrabus is set to 1: 9. As a result, the sound of the contrabass included in the R channel audio signal is emphasized. In this way, only the level of the audio signal of the channel including the contrabus is adjusted.

  Further, the level adjustment units 12LB and 12RB include the channel adjustment unit 104 that adjusts the sound of the part for each channel, thereby enabling the following level adjustment. For example, the level adjusters 12LB and 12RB, based on the operation input to the right side part operator 401, when the part operators 401 indicating the contrabass are displayed on the right and left sides of the stage on the display 24. By adjusting the gain of the channel adjustment unit 104 corresponding to the R channel, the sound level of the contrast bass only on the right side is adjusted.

DESCRIPTION OF SYMBOLS 1, 2 ... Signal processing apparatus 11, 11A ... Input part 12, 12A, 12B, 12L, 12R, 12LB, 12RB ... Level adjustment part 13, 13A ... Output part 21, 21A ... Voice analysis part 22 ... Part DB
DESCRIPTION OF SYMBOLS 23 ... Control part 24 ... Display 25 ... Touch panel 100,100A, 100B ... Band level adjustment part 101 ... Extraction part 102 ... Level adjustment part 103 ... Detection part 104 ... Channel adjustment part 200 ... Composition part 301-310 ... Operator 401- 403 ... Part operator

Claims (5)

An input unit to which an audio signal is input;
A part extraction unit for extracting a part based on a frequency peak component from the audio signal input to the input unit;
A display unit for displaying a part operator for level adjustment for each part extracted by the part extraction unit;
An operation unit for accepting an operation input to the part operator;
A level adjustment unit that adjusts the level of the frequency corresponding to each part based on the operation input received by the operation unit;
A signal processing apparatus comprising: The level adjusting unit adjusts the level of the fundamental and harmonic frequencies for each part.
The signal processing apparatus according to claim 1. A display position determination unit that determines a display position for each part based on the extraction result by the part extraction unit;
The display unit displays the part operator at the display position determined by the display position determination unit.
The signal processing apparatus according to claim 1 or 2. A level detection unit that detects the level of each part extracted by the part extraction unit;
The level adjustment unit controls a level adjustment amount based on the level for each part detected by the level detection unit and the operation input.
The signal processing device according to claim 1. An input step in which an audio signal is input;
A part extraction step of extracting a part from the audio signal input in the input step based on a frequency peak component;
A display step for displaying a part operator for level adjustment for each part extracted in the part extraction step;
An operation step for accepting an operation input to the part operator;
Based on the operation input accepted in the operation step, a level adjustment step for adjusting the level of the frequency corresponding to each part;
A program for causing a signal processing device to execute.

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