JP2010118985A - Signal processing apparatus, signal processing method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a corrected waveform that more accurately indicates actual correction characteristics to a user while reducing the number of waveform patterns to be prepared. <P>SOLUTION: In accordance with the Q value of each register, a pattern acquiring section 31 acquires a waveform pattern from a memory 18. A pattern shift section 32 shifts a waveform pattern for a middle register in a left direction by only D/3, thereby generating a waveform pattern for a lower register. Similarly, the waveform pattern for the middle register is shifted in a right direction by only D/3 to generate a waveform pattern for a higher register. A multiplier 33 multiplies the waveform patterns for the respective registers by a value corresponding to the gain G of each register. An adder 34 adds the waveform patterns for the respective registers to generate a corrected waveform. The present invention can be applied to an equalizer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a signal processing device, a signal processing method, and a program, and more particularly, to a signal processing device, a signal processing method, and a program suitable for correcting the frequency characteristics of an audio signal and displaying the correction characteristics. .

  Conventionally, an equalizer exists as a device for correcting a frequency characteristic of an audio signal. Equalizers are broadly divided into shulping types and peak dip types. In the case of the shulping type, higher frequency components (or lower frequency components) are corrected together with a predetermined frequency as a boundary. In the case of the peak dip type, only the vicinity of a predetermined frequency is corrected.

  According to the peak dip type equalizer, for example, the entire sound range can be divided into a plurality of sound ranges (low range, middle range, high range, etc.), and the volume of each range can be individually adjusted. Specifically, it is possible to emphasize only the volume in the high range or suppress only the volume in the low range.

  Some portable and vehicle-mounted audio devices have a built-in function (hereinafter simply referred to as an equalizer function) as a simple equalizer that can correct the frequency characteristics of a reproduced audio signal.

  Then, in an audio device with a built-in peak dip type equalizer function, for example, by displaying a waveform as shown in FIG. 1 on the display, the correction characteristic for each range of the audio signal by the equalizer function can be given to the user. Many of them are designed to be notified visually (see, for example, Patent Document 1).

  In the case of the waveform shown in FIG. 1, the correction characteristic indicates that correction is performed to emphasize the low and high sound ranges and suppress the mid sound range.

  By the way, when displaying the waveform which shows a correction characteristic as shown in FIG. 1, the waveform pattern according to the combination of the gain G which shows the degree of emphasis and the Q value which shows the inclination of the waveform for each sound range. Must be prepared in advance.

For example, as shown in FIG. 1, if the entire sound range is divided into a low sound range, a middle sound range, and a high sound range, 20 options for gain G and 3 options for Q value are provided, as shown in FIG. 2A. , 180 (= 3 × 20 × 3) waveform patterns need to be held in advance. Note that the waveform pattern for each range is shown in FIG.
This is two-dimensional data composed of a value on the horizontal axis corresponding to the width of each sound range in the display width D of the display and a value on the vertical axis indicating the amplitude of the waveform. The number of steps of the values on the horizontal axis and the vertical axis matches the number of dots on the display.

JP-A-9-274464

  As described above, the number of waveform patterns to be retained depends on the number of divisions in the entire sound range, the number of gain G options, and the number of Q value options. Therefore, as these are increased, the number of waveform patterns to be held increases, so that the memory capacity is consumed to hold them.

  In addition, as described above, when a waveform pattern is prepared for each sound range in which the entire sound range is divided, in order to maintain the continuity of the waveform with the adjacent sound range, as shown in FIG. The amplitude of the waveform is set to zero at the boundary of each sound range, ignoring the mutual interference with each other. However, it is difficult to say that the actual correction characteristic presents accurate information to the user because the amplitude of the waveform is not necessarily zero at the boundary.

  The present invention has been made in view of such a situation, and enables a user to present a correction waveform that more accurately shows actual correction characteristics while reducing the number of waveform patterns prepared in advance. .

  A signal processing device according to one aspect of the present invention is a signal processing device that corrects a frequency characteristic of an audio signal, a correction unit that corrects the frequency characteristic of the audio signal for each of a plurality of frequency bands in accordance with a specified correction parameter; Designating means for designating the correction parameter for each frequency band, holding means for retaining only a waveform pattern indicating a correction characteristic for the first frequency band among the plurality of frequency bands, and each designated frequency band Generating means for generating a correction waveform indicating a correction characteristic for the entire frequency band of the audio signal, based on the waveform pattern corresponding to the held first frequency band, according to the correction parameter for Display control means for displaying the correction waveform.

  The specifying means specifies at least a gain and a Q value as the correction parameters for each frequency band, and the holding means is for the first frequency band of the plurality of frequency bands, and the gain Can be held, and a plurality of waveform patterns each indicating correction characteristics that differ only in the Q value can be held.

  The generation means modifies the waveform pattern corresponding to the held first frequency band according to the correction parameter for each designated frequency band, thereby correcting the first of the plurality of frequency bands. Correction means for generating waveform patterns indicating correction characteristics respectively corresponding to frequency bands other than the frequency band of the audio signal, and adding the waveform patterns respectively corresponding to the generated frequency bands, thereby adding all the frequency bands of the audio signal And a synthesizing unit that synthesizes a correction waveform indicating a correction characteristic with respect to.

  The correction means shifts the waveform pattern corresponding to the held first frequency band, thereby correcting characteristics corresponding to frequency bands other than the first frequency band among the plurality of frequency bands. Shift means for generating a waveform pattern indicating the frequency, and multiplication means for multiplying the waveform pattern corresponding to each generated frequency band by a value based on the designated gain.

  The multiplication means can also multiply the waveform pattern corresponding to the held first frequency band by a value based on the designated gain.

  The signal processing apparatus according to one aspect of the present invention may further include an analysis unit that analyzes a frequency characteristic of the audio signal corrected by the correction unit and generates an analysis waveform indicating an analysis result.

  The display control means can display the correction waveform or the analysis waveform.

  A signal processing method according to one aspect of the present invention is a signal processing method for a signal processing device that corrects the frequency characteristics of an audio signal in accordance with a specified correction parameter for each of a plurality of frequency bands. Only the waveform pattern indicating the correction characteristic for the first frequency band among the plurality of frequency bands is retained in accordance with the specifying step for specifying the correction parameter for the frequency band and the correction parameter for each specified frequency band. A generating step for generating a correction waveform indicating a correction characteristic for the entire frequency band of the audio signal based on the waveform pattern corresponding to the first frequency band held in the holding means, and the generated correction And a display control step for displaying the waveform.

  A program according to an aspect of the present invention is a program for controlling a signal processing device that corrects the frequency characteristics of an audio signal for each of a plurality of frequency bands in accordance with a specified correction parameter, and the correction is performed for each frequency band. According to the specifying step of specifying parameters and the correction parameter for each specified frequency band, the waveform is stored in the holding means that holds only the waveform pattern indicating the correction characteristic for the first frequency band among the plurality of frequency bands. A generating step for generating a correction waveform indicating correction characteristics for the entire frequency band of the audio signal based on the waveform pattern corresponding to the first frequency band, and a display for displaying the generated correction waveform And causing the computer of the signal processing apparatus to execute processing including the control step.

  In one aspect of the present invention, according to a correction parameter for each designated frequency band, only a waveform pattern indicating a correction characteristic for the first frequency band among a plurality of frequency bands is held in a holding unit. Based on the waveform pattern corresponding to the first frequency band, a correction waveform indicating the correction characteristics for the entire frequency band of the audio signal is generated, and the generated correction waveform is displayed.

  According to one aspect of the present invention, it is possible to present to a user a correction waveform that more accurately shows actual correction characteristics while reducing the number of waveform patterns prepared in advance.

Hereinafter, the best mode for carrying out the invention (hereinafter referred to as an embodiment) will be described in detail with reference to the drawings. The description will be given in the following order.
1. First embodiment

<1. First Embodiment>
[Configuration Example of Audio Player 10]
FIG. 3 shows a configuration example of the audio player 10 according to the first embodiment of the present invention. The audio player 10 corrects and outputs the frequency characteristic of the reproduced audio signal, and displays a correction waveform indicating the correction characteristic.

  The audio player 10 includes a control unit 11, an operation input unit 12, an audio signal reproduction unit 13, an audio signal correction unit 14, an audio signal output unit 15, and an audio signal analysis unit 16. Furthermore, the audio player 10 includes a correction waveform generation unit 17, a memory 18, a selector 19, and a display 20.

  The control unit 11 controls the entire audio player 10 based on user operation information notified from the operation input unit 12. The operation input unit 12 receives various operations from the user.

  Specifically, for example, a user's operation for specifying parameters such as gain G and Q value for each sound range when correcting the frequency characteristics of the audio signal is accepted. Instead of the user specifying parameters such as gain G and Q value for each sound range, a correction pattern in which parameters are combined may be prepared in advance, and the user may specify the correction pattern.

  Further, the operation input unit 12 notifies the control unit 11 of operation information corresponding to the user's operation. In response to this notification, the control unit 11 notifies the audio signal correction unit 14 and the correction waveform generation unit 17 of parameters such as gain G and Q value for each sound range when correcting the frequency characteristics of the audio signal.

  The audio signal reproduction unit 13 reads out and decodes audio encoded data from a recording medium (not shown), or acquires and decodes an audio encoded signal via a broadcast network or a network, and obtains an audio obtained as a decoding result. The signal is output to the audio signal correction unit 14.

  The audio signal correction unit 14 corrects the frequency characteristics by dividing the entire sound range of the input audio signal into three sections according to the control from the control unit 11, and converts the corrected audio signal into the audio signal output unit 15 and the audio signal analysis unit 16. Output to. The divided sound ranges are, for example, a low sound range with a center frequency of 100 Hz, a mid sound range with a center frequency of 1 kHz, and a high sound range with a center frequency of 10 kHz.

  The audio signal output unit 15 amplifies the corrected audio signal and outputs it to a speaker (not shown). The audio signal analysis unit 16 analyzes the frequency characteristic of the corrected audio signal and outputs an analysis waveform indicating the analysis result to the selector 19.

  The correction waveform generation unit 17 reads out, corrects, and synthesizes a waveform pattern corresponding to the Q value of each sound range notified from the control unit 11 among the waveform patterns held in the memory 18, thereby generating an audio signal. A correction waveform representing the correction of the actual frequency characteristic in the correction unit 14 relatively accurately is generated and output to the selector 19.

  The memory 18 holds in advance the same number of waveform patterns as the Q value options that can be set with a common gain G for only one sound range.

  FIG. 4 shows an example of a waveform pattern held in advance in the memory 18.

  In the example of FIG. 4A, three types of waveform patterns for the mid-range, with a gain G of 10 dB and different Q values are held. Further, as shown in FIG. 4B, the held waveform pattern is two-dimensional data composed of a value on the horizontal axis corresponding to the horizontal width D of the display and a value on the vertical axis indicating the amplitude of the waveform. The number of steps of the values on the horizontal axis and the vertical axis matches the number of dots on the display.

  Returning to FIG. The selector 19 outputs one of the analysis waveform input from the audio signal analysis unit 16 or the correction waveform input from the correction waveform generation unit 17 to the display 20 in accordance with control from the control unit 11.

  The display 20 has a horizontal width D, the horizontal axis corresponds to 0 Hz to 100 kHz of the audio signal, and the vertical axis corresponds to the amplitude of the waveform, and displays the analysis waveform or the correction waveform input from the selector 19. When displaying the correction waveform, the amplitude of the waveform indicated by the vertical axis corresponds to the gain G.

  Next, FIG. 5 shows a detailed configuration example of the correction waveform generation unit 17. The correction waveform generation unit 17 includes a pattern acquisition unit 31, a pattern shift unit 32, a multiplication unit 33, and an addition unit 34.

  The pattern acquisition unit 31 acquires a waveform pattern from the memory 18 and outputs the waveform pattern to the pattern shift unit 32 according to the Q value of each sound range when the frequency characteristic of the audio signal is corrected notified from the control unit 11.

  For example, when the Q values in the low sound range, the mid sound range, and the high sound range notified from the control unit 11 are all 1, the Q value for one sound range (the mid sound range in the example of FIG. 4) held in the memory 18. Only the waveform pattern of = 1 is acquired. Further, for example, when the Q value in the low sound range notified from the control unit 11, the Q value in the mid sound range = 2, and the Q value in the high sound range = 2, one sound range (in FIG. 4) In the example, a waveform pattern with a Q value = 1 and a waveform pattern with a Q value = 2 for the middle tone range are acquired. Furthermore, for example, when the Q value in the low sound range notified from the control unit 11, the Q value in the middle sound range = 2, and the Q value in the high sound range = 3, one sound range (in FIG. 4) In the example, all three types of waveform patterns for the mid range) are acquired.

  The pattern shift unit 32 uses the waveform pattern for one sound range (medium sound region in the example of FIG. 4) input from the pattern acquisition unit 31 for the other two sound regions (low sound region and high sound region in the example of FIG. 4). Correct it. Further, the pattern shift unit 32 has a waveform pattern for one sound range (middle sound range in the example of FIG. 4) input from the pattern acquisition unit 31 and two other sound ranges (bass in the example of FIG. 4) generated by the correction. And the waveform pattern for the high sound range) are output to the multiplier 33.

  The correction of the waveform pattern by the pattern shift unit 32 will be specifically described. FIG. 6 shows a waveform pattern indicating a correction characteristic for a mid-sound region centered on 1 KHz and a waveform pattern indicating a correction characteristic for a low-sound region centered on 100 Hz. In the figure, the horizontal axis indicates the logarithm of the frequency, and the vertical axis indicates the gain G.

  As is clear from the figure, the two waveform patterns have different peaks at their center frequencies, but the shapes are the same. Therefore, the waveform pattern for the low sound region is generated by shifting the waveform pattern for the middle sound region shown in FIG. 7 held in the memory 18 to the left by D / 3 as shown in FIG. . However, in this case, since the waveform data is insufficient on the higher frequency side than 1 kHz, 0 is compensated as shown in FIG.

  Similarly, the waveform pattern showing the correction characteristics for the mid range centered at 1 KHz and the waveform pattern showing the correction characteristics for the high range centered at 10 kHz have different peaks at the center frequency. The shapes match (not shown). Therefore, the waveform pattern for the high sound range is generated by shifting the waveform pattern for the mid sound range shown in FIG. 7 to the right by D / 3. In this case, since the waveform data is insufficient at a frequency lower than 100 Hz, it is compensated with 0.

  Returning to FIG. The multiplication unit 33 multiplies the waveform pattern for the low range, the mid range, and the high range input from the pattern shift unit 32 by a value corresponding to the gain G of each range notified from the control unit 11. The result is output to the adder 34.

  The multiplication by the multiplication unit 33 will be specifically described. FIG. 10 shows a waveform pattern (shown by diamonds in the figure) indicating a correction characteristic when the sound range is common (for example, a mid range having a center frequency of 1 KHz) and the gain G is 10 dB. A waveform pattern (shown by a square ■ in the figure) when the gain is 5 dB and a waveform pattern obtained by multiplying the waveform pattern showing the correction characteristic when the gain G is 10 dB by 0.5 (shown in the figure) (Shown by a triangle Δ).

  Compare the waveform pattern (indicated by the square ■ in the figure) when the gain G = 5 dB and the waveform pattern (indicated by the triangle Δ in the figure) obtained by multiplying the waveform pattern when the gain G = 10 dB by 0.5. As is clear from the above, the two waveform patterns are not completely coincident, but their shapes are similar. The error of both waveform patterns is about 0.5 dB at maximum, which can be said to be an error range when displayed on the display 20. Therefore, the multiplication unit 33 multiplies the waveform pattern when the gain G is 10 dB by 0.5 and uses it as a substitute for the waveform pattern indicating the correction characteristic when the gain G is 5 dB.

  Similarly, for example, as a substitute for the waveform pattern indicating the correction characteristic when the gain G is x dB, x / 10 is used to multiply the waveform pattern when the gain G is 10 dB.

  Returning to FIG. As shown in FIG. 11, the adding unit 34 aligns the horizontal axis of the waveform pattern for the low range, the waveform pattern for the mid range, and the waveform pattern for the high range, which are input from the multiplication unit 33, By adding the value (gain G), a waveform pattern for the entire sound range of the audio signal, that is, a correction waveform is synthesized. In addition, in the case of FIG. 11, the example which added the waveform pattern for low sounds and the waveform pattern for middle sounds is shown.

  However, when the addition result in the adding unit 34 exceeds the maximum value of the gain G, correction (for example, correction to the maximum value of in G) is necessary.

[Description of operation]
Next, processing for displaying a correction waveform indicating an actual correction characteristic when correcting the frequency characteristic of the audio signal will be described with reference to FIG. FIG. 12 is a flowchart for explaining the correction waveform display processing.

  In step S1, the control unit 11 determines the gain G and Q value for each sound range when correcting the frequency characteristics of the audio signal based on the user operation information notified from the operation input unit 12, and the audio signal correction unit. 14 and the correction waveform generation unit 17.

  Hereinafter, for example, gain G = 5 and Q value = 2 for the low sound range, gain G = 4 and Q value = 1 for the mid sound range, and gain G = 10 and Q value = 1 for the high sound range. Assume that it has been determined. Further, it is assumed that the three types of waveform patterns shown in FIG. 4 are held in the memory 18.

  In step S <b> 2, the pattern acquisition unit 31 of the correction waveform generation unit 17 among the three types of waveform patterns for the mid range stored in the memory 18, the waveform pattern for the mid range (gain G = 10, Q value = 1) and the waveform pattern for the midrange (gain G = 10, Q value = 2) is acquired and output to the pattern shift unit 32.

  In step S3, the pattern shift unit 32 shifts the waveform pattern for the mid range (gain G = 10, Q value = 2) input from the pattern acquisition unit 31 to the left by D / 3, thereby moving the low range. Waveform pattern (gain G = 10, Q value = 2) is generated. In addition, the pattern shift unit 32 shifts the waveform pattern for the mid range (gain G = 10, Q value = 1) input from the pattern acquisition unit 31 to the right by D / 3 by moving the waveform pattern for the high range. A waveform pattern (gain G = 10, Q = 1) is generated.

  Then, the pattern shift unit 32 generates the waveform pattern for the low sound range (gain G = 10, Q = 2) and the waveform pattern for the mid sound range input from the pattern acquisition unit 31 (gain G = 10, Q = 1). ) And the generated waveform pattern for the high frequency range (gain G = 10, Q = 1) is output to the multiplier 33.

  In step S4, the multiplication unit 33 multiplies the waveform pattern for low frequency range (gain G = 10, Q = 2) input from the pattern shift unit 32 by 0.5 (= 5/10) to generate the low frequency range. Waveform pattern (gain G = 5, Q = 2) is generated. The multiplying unit 33 multiplies the waveform pattern for the mid range (gain G = 10, Q = 1) input from the pattern shift unit 32 by 0.4 (= 4/10) to obtain the waveform for the mid range. A pattern (gain G = 4, Q = 2) is generated. Further, the multiplication unit 33 multiplies the waveform pattern for high sound range (gain G = 10, Q = 1) input from the pattern shift unit 32 by 1 (= 1/10) to obtain a waveform for high sound range. A pattern (gain G = 10, Q = 1) is generated. Of course, in this case, the process of multiplying the waveform pattern for high sound range (gain G = 10, Q = 1) by 1 may be omitted.

  Then, the multiplication unit 33 generates the waveform pattern for the low tone range (gain G = 5, Q = 2), the waveform pattern for the mid tone range (gain G = 4, Q = 2), and the waveform pattern for the high tone range. (Gain G = 10, Q = 1) is output to the adder 34.

  In step S5, the adder 34 aligns the horizontal axes of the waveform pattern for the low frequency range, the waveform pattern for the mid range, and the waveform pattern for the high range input from the multiplier 33, and adds the value on the vertical axis. By doing so, a correction waveform indicating a correction characteristic for the entire sound range of the audio signal is synthesized. Then, the adding unit 34 outputs the generated correction waveform to the selector 19.

  In step S <b> 6, the selector 19 outputs the correction waveform input from the addition unit 34 of the correction waveform generation unit 17 to the display 20 in accordance with the control from the control unit 11. The display 20 displays the correction waveform input from the selector 19. The correction waveform display process is thus completed.

  As described above, according to the corrected waveform display processing by the audio player 10, the number of waveform patterns stored in the memory 18 in advance is extremely small compared to the conventional (120 in the example of FIG. 2) (this book In the embodiment, 3) is possible. Therefore, the capacity of the memory 18 can be reduced.

  Further, although the number of waveform patterns stored in the memory 18 is small, a correction waveform that shows the actual correction characteristics relatively accurately can be presented to the user.

  In the present embodiment, the total number of sections of the audio signal is set to 3, but the present invention is not limited to this.

  Further, the present invention can be applied to an apparatus that corrects the frequency characteristics of an audio signal and visually presents the correction characteristics to the user.

  By the way, the above-described series of processing can be executed by hardware or can be executed by software. When a series of processing is executed by software, a program constituting the software is installed in the computer. Here, the computer includes, for example, a general-purpose personal computer capable of executing various functions by installing a computer incorporated in dedicated hardware and various programs.

  FIG. 13 is a block diagram showing a hardware configuration example of a computer that executes the above-described series of processing by a program.

  In this computer 100, a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, and a RAM (Random Access Memory) 103 are connected to each other by a bus 104.

  An input / output interface 105 is further connected to the bus 104. An input unit 106, an output unit 107, a storage unit 108, a communication unit 109, and a drive 110 are connected to the input / output interface 105.

  The input unit 106 includes a keyboard, a mouse, a microphone, and the like. The output unit 107 includes a display, a speaker, and the like. The storage unit 108 includes a hard disk, a nonvolatile memory, and the like. The communication unit 109 includes a network interface or the like. The drive 110 drives a removable medium 111 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

  In the computer 100 configured as described above, for example, the CPU 101 loads the program stored in the storage unit 108 to the RAM 103 via the input / output interface 105 and the bus 104 and executes the program. A series of processing is performed.

  The embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

It is a figure which shows an example of the conventional correction waveform. It is a figure which shows the example of the correction pattern currently hold | maintained conventionally. It is a block diagram which shows the structural example of the audio player to which this invention is applied. It is a figure which shows the waveform pattern hold | maintained at memory. It is a block diagram which shows the detailed structural example of the correction | amendment waveform generation part of FIG. It is a figure for demonstrating operation | movement of the pattern shift part of FIG. It is a figure for demonstrating operation | movement of the pattern shift part of FIG. It is a figure for demonstrating operation | movement of the pattern shift part of FIG. It is a figure for demonstrating operation | movement of the pattern shift part of FIG. It is a figure for demonstrating operation | movement of the multiplication part of FIG. It is a figure for demonstrating operation | movement of the addition part of FIG. It is a flowchart explaining a correction waveform display process. It is a block diagram which shows the structural example of a computer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Audio player, 11 Control part, 12 Operation input part, 13 Audio signal reproducing part, 14 Audio signal correction part, 15 Audio signal output part, 16 Audio signal analysis part, 17 Correction waveform generation part, 18 Memory, 19 Selector, 20 display

Claims (9)

In a signal processing device for correcting the frequency characteristics of an audio signal,
Correction means for correcting the frequency characteristics of the audio signal according to a specified correction parameter for each of a plurality of frequency bands;
Designating means for designating the correction parameter for each frequency band;
A holding means for holding only a waveform pattern indicating a correction characteristic for the first frequency band among the plurality of frequency bands;
Generation of generating a correction waveform indicating correction characteristics for all frequency bands of the audio signal based on the waveform pattern corresponding to the held first frequency band in accordance with the correction parameter for each designated frequency band Means,
And a display control means for displaying the generated correction waveform. The designation means designates at least a gain and a Q value as the correction parameters for each frequency band,
The holding means holds the plurality of waveform patterns for the first frequency band among the plurality of frequency bands, the gain being common and only the Q value being different from each other. The signal processing apparatus according to claim 1. The generating means includes
By correcting the waveform pattern corresponding to the held first frequency band in accordance with the correction parameter for each designated frequency band, a frequency other than the first frequency band of the plurality of frequency bands is obtained. Correction means for generating a waveform pattern indicating correction characteristics corresponding to each frequency band;
The signal processing apparatus according to claim 2, further comprising: a synthesizing unit that synthesizes a correction waveform indicating a correction characteristic for the entire frequency band of the audio signal by adding the waveform patterns respectively corresponding to the generated frequency bands. . The correcting means is
By shifting the waveform pattern corresponding to the held first frequency band, waveform patterns indicating correction characteristics respectively corresponding to frequency bands other than the first frequency band of the plurality of frequency bands are displayed. Shift means to generate;
The signal processing apparatus according to claim 3, further comprising multiplication means for multiplying the waveform pattern corresponding to each generated frequency band by a value based on the designated gain. The signal processing apparatus according to claim 4, wherein the multiplication unit multiplies the waveform pattern corresponding to the held first frequency band by a value based on the designated gain. The signal processing apparatus according to claim 1, further comprising an analysis unit that analyzes a frequency characteristic of the audio signal corrected by the correction unit and generates an analysis waveform indicating an analysis result. The signal processing apparatus according to claim 6, wherein the display control unit displays the correction waveform or the analysis waveform. In the signal processing method of the signal processing device for correcting the frequency characteristics of the audio signal according to a specified correction parameter for each of a plurality of frequency bands,
According to the signal processing device,
A designation step for designating the correction parameter for each frequency band;
In accordance with the correction parameter for each specified frequency band, the first frequency held in the holding means that holds only the waveform pattern indicating the correction characteristic for the first frequency band among the plurality of frequency bands. Based on the waveform pattern corresponding to a band, a generation step for generating a correction waveform indicating correction characteristics for the entire frequency band of the audio signal;
A display control step of displaying the generated correction waveform. A program for controlling a signal processing device that corrects frequency characteristics of an audio signal according to a specified correction parameter for each of a plurality of frequency bands,
A designation step for designating the correction parameter for each frequency band;
In accordance with the correction parameter for each specified frequency band, the first frequency held in the holding means that holds only the waveform pattern indicating the correction characteristic for the first frequency band among the plurality of frequency bands. Based on the waveform pattern corresponding to a band, a generation step for generating a correction waveform indicating correction characteristics for the entire frequency band of the audio signal;
And a display control step for displaying the generated correction waveform.

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