JP7423916B2 - Signal processing device, signal processing method, and program - Google Patents

Description

The present invention relates to a signal processing device, a signal processing method, and a program.

A signal processing device using an effector such as a parametric equalizer (PEQ: Parametric Equalizer) whose parameters can be changed is known (for example, see Patent Document 1).

US Patent Application Publication No. 2005/0190930

However, with conventional signal processing devices such as those described above, when setting a frequency for adding a sound effect using an effector such as PEQ, the user manually operates a controller such as a setting knob while producing sound. It was necessary to check the frequencies and determine the target frequency. Therefore, in conventional signal processing devices, setting the frequency is complicated.

The present invention has been made to solve the above problems, and its purpose is to provide a signal processing device, a signal processing method, and a signal processing method that can easily set frequencies in signal processing and improve convenience. The goal is to provide programs.

In order to solve the above problem, one aspect of the present invention includes a sound signal input section, an instruction section that instructs setting of a setting frequency of an effector that adds a predetermined sound effect to the sound signal, and an instruction from the instruction section. , the frequency of the sound signal input from the sound signal input unit and which is the target sound of the musical instrument is specified, and the frequency of the specified sound signal is set as the set frequency of the effector. a setting processing unit for setting, the setting processing unit extracts a frequency included in the sound signal input from the sound signal input unit, and the extracted frequency is not a single frequency, and the extracted frequency is If the sound signal does not constitute a harmonic series that includes the fundamental tone and overtones that are integral multiples of the fundamental tone, it is determined that the set frequency could not be specified normally, and if the frequency of the sound signal cannot be specified, the set frequency This is a signal processing device that does not update the settings .

Further, in one aspect of the present invention, the instruction section instructs to set a setting frequency of an effector that adds a predetermined sound effect to the sound signal, and the setting processing section controls the sound signal based on the instruction from the instruction section. specifying the frequency of a sound signal input from the input section and which is the target sound played on the musical instrument, setting the frequency of the specified sound signal as a setting frequency of the effector, and controlling the setting processing section. However, the frequency contained in the sound signal input from the sound signal input section is extracted, and the extracted frequency is not a single frequency, but the extracted frequency is a fundamental tone of the sound signal and overtones that are integral multiples of the fundamental tone. This is a signal processing method in which it is determined that the set frequency could not be normally specified when the set frequency does not constitute a harmonic series including the sound signal, and the setting of the set frequency is not updated when the frequency of the sound signal cannot be specified .

Further, in one aspect of the present invention, a computer of a signal processing apparatus including a sound signal input section and an instruction section for instructing setting of a set frequency of an effector that adds a predetermined sound effect to a sound signal is provided with a signal from the instruction section. a frequency specifying step of specifying the frequency of the sound signal input from the sound signal input section based on an instruction from the sound signal input section; This is a program for executing a frequency setting step of setting the frequency of a certain sound signal to a set frequency of the effector, and in the frequency specifying step, a frequency included in the sound signal input from the sound signal input section is extracted. However, if the extracted frequency is not a single frequency and does not constitute a harmonic series that includes the fundamental tone of the sound signal and overtones that are integral multiples of the fundamental tone, the set frequency cannot be correctly identified. If the frequency of the sound signal cannot be specified in the frequency setting step, the program does not update the setting of the set frequency .

According to the present invention, it is possible to easily set frequencies in signal processing, and convenience can be improved.

FIG. 1 is a block diagram showing an example of a signal processing device according to the present embodiment. 7 is a flowchart illustrating an example of PEQ frequency setting processing in the present embodiment. 7 is a flowchart illustrating an example of a PEQ parameter adjustment process according to the present embodiment. 7 is a flowchart illustrating an example of a PEQ setting process of the signal processing device according to the present embodiment. It is a figure which shows an example of the PEQ setting process of the signal processing apparatus in this embodiment. It is a flowchart which shows an example of operation of PEQ in this embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A signal processing device and a signal processing method according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing an example of a signal processing device 1 according to this embodiment.
As shown in FIG. 1, the signal processing device 1 includes a sound signal input section 11, a PEQ 12, a sound signal output section 13, a frequency designation switch 14, an adjustment switch 15, and a setting processing section 16.

The sound signal input section 11 is an input terminal, an input connector, or the like, receives an input sound signal (input sound signal), and outputs the input sound signal to the PEQ 12 and the setting processing section 16.

A PEQ (Parametric Equalizer) 12 (an example of an effector) adds a predetermined sound effect to the input sound signal received by the sound signal input section 11. The PEQ 12 includes, for example, a DSP (Digital Signal Processor), and realizes the function of a parametric equalizer through digital signal processing by the DSP. For example, the PEQ 12 executes acoustic processing to amplify or reduce the signal level in a predetermined range centered around the set frequency, based on a set frequency (set frequency) and parameters.

Here, the set frequency is, for example, the center frequency at which processing for adding acoustic effects by PEQ12 is executed. The PEQ 12 outputs a sound signal obtained by adding a predetermined sound effect to the input sound signal to the sound signal output section 13 . The parameters of the PEQ 12 include a gain for amplifying or reducing the signal level, a Q value for determining the bandwidth for setting the gain, and the like.

The sound signal output unit 13 is, for example, an output terminal or an output connector, and outputs a sound signal (output sound signal) to which a predetermined sound effect has been added by the PEQ 12 to the outside. Note that the sound signal output section 13 may include, for example, a DAC (Digital to Analog Converter) and an output amplifier.

The frequency designation switch 14 (an example of an instruction section) instructs setting of the set frequency of the PEQ 12 described above. The frequency designation switch 14 is, for example, a button switch or a foot switch, and when pressed by the user, outputs a setting instruction for a set frequency to the setting processing section 16.

The adjustment switch 15 is, for example, an adjustment key, adjustment knob, adjustment knob, slider, etc. for adjusting various parameters of the PEQ 12, and receives adjustment information for adjusting various parameters from the user and outputs it to the setting processing section 16.

The setting processing unit 16 specifies the frequency of the sound signal (input sound signal) input from the sound signal input unit 11 based on the instruction from the frequency designation switch 14, and sets the frequency of the specified sound signal to the set frequency of the PEQ 12. Set to . That is, the setting processing unit 16 outputs the frequency of the input sound signal (for example, the frequency of the fundamental tone) to the PEQ 12 as the set frequency, and changes the setting of the set frequency of the PEQ 12. Further, the setting processing unit 16 does not change the setting frequency when the frequency of the sound signal cannot be specified.

The setting processing unit 16 changes the settings of the parameters of the PEQ 12 based on the adjustment information from the adjustment switch 15. The setting processing unit 16 adjusts the settings of parameters (for example, gain and Q value) of the PEQ 12 by adjusting the adjustment switch 15.
The setting processing section 16 includes a frequency extraction section 161, a frequency setting section 162, and a parameter adjustment section 163.

The frequency extraction unit 161 extracts frequencies included in the input sound signal. The frequency extraction unit 161 acquires an input sound signal from the sound signal input unit 11 in accordance with an instruction from the frequency designation switch 14, and processes the acquired input sound signal by, for example, FFT (Fast Fourier Transform) or existing pitch extraction. The frequency included in the input sound signal (for example, the frequency of the fundamental tone) is extracted using a technique or the like. The frequency extraction unit 161 extracts the frequency peak of the input sound, and extracts the lowest peak frequency corresponding to the fundamental tone.
For example, the frequency extraction unit 161 may extract the frequency of the input sound signal that is first input after the instruction that the frequency designation switch 14 is pressed, or the frequency of the input sound signal that is input while the frequency designation switch 14 is pressed. The frequency of the input sound signal may be extracted.

The frequency setting section 162 specifies a set frequency based on the frequency extracted by the frequency extraction section 161. For example, the frequency setting unit 162 specifies the frequency of the fundamental tone extracted by the frequency extraction unit 161 as the set frequency. Specifically, the frequency setting unit 162 sets the frequency of the fundamental tone, for example, when the frequencies extracted by the frequency extraction unit 161 constitute a harmonic series (for example, a frequency series of fundamental, second harmonic, third harmonic, etc.). Specify as the set frequency. Further, the frequency setting section 162 cannot correctly specify the set frequency when, for example, the frequency extracted by the frequency extraction section 161 is not a single frequency (sine wave) and the extracted frequency does not constitute a harmonic series. It is determined that there was no such thing.

The frequency setting unit 162 sets the frequency of the input sound signal (for example, the frequency of the fundamental tone) specified as the set frequency to the PEQ12. Note that when the frequency setting section 162 cannot correctly identify the set frequency (when the frequency extracted by the frequency extraction section 161 is not a single frequency (sine wave) and the extracted frequency does not constitute a harmonic series) ), do not change (set) the set frequency. That is, when a single tone sound signal is input as the input sound signal, the frequency setting unit 162 sets the frequency of the single tone (fundamental frequency) as the set frequency in PEQ12, and adds a sound signal other than the single tone to the input sound signal. Do not change the setting frequency if is entered.

The parameter adjustment unit 163 acquires adjustment information from the adjustment switch 15, and changes (adjusts) the parameters of the PEQ 12 based on the adjustment information. For example, when adjustment information for adjusting the gain and Q value is acquired from the adjustment switch 15, the parameter adjustment unit 163 sets the gain and Q value according to the adjustment information to PEQ12. Note that the parameter adjustment section 163 may adjust the set frequency set by the frequency setting section 162 based on the adjustment information acquired from the adjustment switch 15.

The operation of the signal processing device 1 according to this embodiment will be described with reference to the drawings.
First, with reference to FIG. 2, the frequency setting process of the PEQ 12 in this embodiment will be described.
FIG. 2 is a flowchart showing an example of the frequency setting process of the PEQ 12 in this embodiment.

As shown in FIG. 2, the setting processing unit 16 of the signal processing device 1 first determines whether there is an instruction from the frequency designation switch 14 (step S101). For example, the setting processing unit 16 determines whether or not the frequency designation switch 14 is pressed and an instruction to set the setting frequency of the PEQ 12 is issued from the frequency designation switch 14 . If there is a setting instruction from the frequency designation switch 14 (step S101: YES), the setting processing unit 16 advances the process to step S102. Further, if there is no setting instruction from the frequency designation switch 14 (step S101: NO), the setting processing unit 16 returns the process to step S101.

In step S102, the frequency extraction section 161 of the setting processing section 16 extracts a frequency from the sound signal. That is, the frequency extraction section 161 obtains the input sound signal from the sound signal input section 11 in response to a setting instruction from the frequency designation switch 14, and extracts the frequency included in the obtained input sound signal.

The frequency setting unit 162 of the setting processing unit 16 specifies a set frequency based on the frequency extraction result (step S103). For example, the frequency setting unit 162 specifies the frequency of the fundamental tone extracted by the frequency extraction unit 161 as the set frequency.

The frequency setting unit 162 determines whether the set frequency has been successfully specified (step S104). That is, the frequency setting unit 162 determines whether the set frequency has been successfully specified, for example, depending on whether the frequency extracted by the frequency extraction unit 161 is a single frequency (sine wave) or constitutes a series of overtones. Determine whether If the frequency setting unit 162 has successfully identified the set frequency (for example, the frequency of the fundamental tone has been identified) (step S104: YES), the process proceeds to step S105. Further, if the frequency setting unit 162 is unable to normally specify the set frequency (for example, the frequency of the fundamental tone cannot be specified) (step S104: NO), the frequency setting unit 162 returns the process to step S101 and sets the PEQ12. Do not perform frequency changes.

In step S105, the frequency setting unit 162 sets the set frequency to PEQ12. That is, the frequency setting unit 162 outputs the specified setting frequency (for example, the frequency of the fundamental tone) to the PEQ 12, and causes the PEQ 12 to set the setting frequency. After the process in step S105, the frequency setting unit 162 returns the process to step S101 and repeats the process from step S101 to step S105.

As described above, in the frequency setting process in this embodiment, the setting processing unit 16 specifies the frequency of the input sound signal input from the sound signal input unit 11 based on the instruction from the frequency designation switch 14, and specifies the frequency of the input sound signal input from the sound signal input unit 11. The frequency of the input sound signal (for example, the frequency of the fundamental tone) is set to the set frequency of PEQ12.

In the process shown in FIG. 2 described above, the processes in step S102 and step S103 correspond to a frequency specifying step of specifying the frequency of the sound signal input from the sound signal input section 11 based on an instruction from the frequency specifying switch 14. do. Furthermore, the processing in steps S104 and S103 corresponds to a frequency setting step of setting the frequency of the identified sound signal to the set frequency of the PEQ12.

With reference to FIG. 3, the parameter adjustment process of PEQ12 in this embodiment will be described.
FIG. 3 is a flowchart illustrating an example of the parameter adjustment process of PEQ12 in this embodiment.

As shown in FIG. 3, the setting processing unit 16 of the signal processing device 1 first determines whether there is an instruction for adjustment from the adjustment switch 15 (step S201). The setting processing unit 16 determines, for example, whether the adjustment switch 15 has been adjusted and there is an instruction from the adjustment switch 15 to adjust the parameters of the PEQ 12. If there is an adjustment instruction from the adjustment switch 15 (step S201: YES), the setting processing unit 16 advances the process to step S202. Further, if there is no adjustment instruction from the adjustment switch 15 (step S201: NO), the setting processing unit 16 returns the process to step S201.

In step S202, the parameter adjustment unit 163 of the setting processing unit 16 sets the parameter to PEQ12 based on the adjustment instruction. That is, the parameter adjustment unit 163 sets the parameter to PEQ12 based on the adjustment information included in the adjustment instruction from the adjustment switch 15. The parameter adjustment unit 163 outputs, for example, the gain and Q value of the PEQ12 as parameters to the PEQ12, and changes the parameters of the PEQ12. After the process in step S202, the parameter adjustment unit 163 returns the process to step S201.

As described above, in the parameter adjustment process in this embodiment, the parameter adjustment unit 163 adjusts the parameters of the PEQ 12 based on the adjustment instruction from the adjustment switch 15.

An example of a procedure for setting the PEQ12 in this embodiment will be described with reference to FIGS. 4 and 5.
FIG. 4 is a flowchart illustrating an example of the PEQ 12 setting process of the signal processing device 1 in this embodiment. FIG. 5 is a diagram illustrating an example of the setting process of the PEQ 12 of the signal processing device 1 in this embodiment. In the graph shown in FIG. 5, the vertical axis shows the signal level (or gain), and the horizontal axis shows the frequency.

As shown in FIG. 4, when performing the setting process of PEQ12 in the signal processing device 1 according to the present embodiment, the user first adjusts the adjustment switch 15 to set the parameter to PEQ12 (step S301). That is, the parameter adjustment unit 163 of the signal processing device 1 sets the parameters to PEQ12 by the parameter adjustment process of PEQ12 shown in FIG. 3 described above.

As a result, parameters such as those shown in the equalizer characteristic Ec1 in FIG. 5(a) are set in PEQ12, for example.
In the gain characteristic of PEQ12 shown in FIG. 5(a), the equalizer characteristic Ec1 adjusts the parameter at the set frequency before the setting change (the previously set frequency remains) by the parameter adjustment process in step S301 described above. This shows the state in which the

The user sets the set frequency to PEQ by pressing the frequency designation switch 14 and inputting a sound signal (step S302). The setting processing unit 16 of the signal processing device 1 sets the setting frequency to the PEQ 12 by the frequency setting process of the PEQ 12 shown in FIG. 2 described above.

Here, the sound signal is a sound signal of a single sound, and the setting processing unit 16 inputs a sound signal of a single sound (input sound signal) via the sound signal input unit 11 in accordance with an instruction from the frequency specifying switch 14. get. Further, the frequency extraction unit 161 of the setting processing unit 16 extracts the frequency included in the acquired input sound signal, and the frequency setting unit 162 of the setting processing unit 16 sets the frequency based on the frequency extracted by the frequency extraction unit 161. Identify the frequency. The frequency setting unit 162 sets the specified setting frequency to the PEQ12.

As a result, the set frequency and parameters as shown in the equalizer characteristic Ec2 of FIG. 5(b) are set in the PEQ12.
In the gain characteristic of the PEQ12 shown in FIG. 5(b), the equalizer characteristic Ec2 indicates a state in which the set frequency is set by the frequency setting process in step S302 described above. Further, frequencies F1 to F3 indicate frequencies extracted by the frequency extraction section 161 from the input sound signal.

Since the input sound signal is a single tone, the frequency extraction unit 161 extracts, for example, the frequency F1 of the fundamental tone, the frequency F2 of the second overtone, and the frequency F3 of the third overtone.
As shown in FIG. 5(b), the frequency setting unit 162 specifies the lowest fundamental frequency F1 from frequencies F1 to F3 as the set frequency, and sets the set frequency to PEQ12. Thereby, as shown in the equalizer characteristic Ec2, the frequency F1 is set as the set frequency of the PEQ12. After the process of step S302, the setting processing unit 16 ends the setting process of PEQ12.

In the example shown in FIG. 4 described above, an example was explained in which the parameter is set to PEQ12 and then the set frequency is set to PEQ12, but the parameter may be set to PEQ12 after the set frequency is set to PEQ12. . That is, the setting processing unit 16 of the signal processing device 1 reverses the order of the processing of step S301 and the processing of step S302 shown in FIG. After the setting process is executed, the PEQ12 parameter adjustment process may be executed.

The operation of the PEQ 12 in this embodiment will be explained with reference to FIG.
FIG. 6 is a flowchart showing an example of the operation of the PEQ 12 in this embodiment.
As shown in FIG. 6, the PEQ 12 first obtains an input sound signal (step S401). The PEQ 12 acquires an input sound signal via the sound signal input section 11.

The PEQ 12 adds a sound effect to the input sound signal obtained by operating the PEQ using the set frequency and parameters (step S402). The PEQ 12 adds a predetermined sound effect, for example, based on the set frequency and parameters set by the setting processing unit 16.

The PEQ 12 causes the sound signal output unit 13 to output the sound signal to which the sound effect has been added (step S403). That is, the PEQ 12 outputs the sound signal to which the sound effect has been added to the sound signal output section 13, and the sound signal output section 13 outputs the sound signal to the outside. After the processing in step S403, the PEQ 12 returns the processing to step S401 and repeats the processing from step S401 to step S403.

As described above, the signal processing device 1 according to the present embodiment includes the sound signal input section 11, the frequency designation switch 14 (instruction section), and the setting processing section 16. The sound signal input unit 11 receives an input sound signal (input sound signal). The frequency designation switch 14 instructs the setting frequency of the PEQ 12 (effector) that adds a predetermined acoustic effect to the sound signal. The setting processing section 16 specifies the frequency of the sound signal input from the sound signal input section 11 based on the instruction from the frequency designation switch 14, and sets the frequency of the specified sound signal as the setting frequency of the PEQ 12.

As a result, the signal processing device 1 according to the present embodiment can intuitively and easily determine the sound range (set frequency) to which a sound effect is to be added by inputting a single sound with a specific pitch such as a musical instrument sound as an input sound signal. Can be specified. Therefore, the signal processing device 1 according to this embodiment can easily set the frequency and improve convenience.
For a musical instrument player, the most intuitive way to express a pitch (frequency) is to produce (play) a sound at that pitch on a musical instrument. In the signal processing device 1 according to the present embodiment, the user can intuitively and easily set the PEQ 12 by playing the target sound on the musical instrument while pressing the frequency specifying switch 14.

Further, the signal processing device 1 according to the present embodiment sets the set frequency of the PEQ 12 using the sound signal input from the sound signal input unit 11, and also uses the PEQ 12 to set the set frequency of the PEQ 12 using the sound signal input from the sound signal input unit 11. Add sound effects. That is, in the signal processing device 1 according to the present embodiment, a setting frequency setting process and a sound effect adding process can be performed using a sound signal input to one sound signal input section 11. Therefore, in the signal processing device 1 according to this embodiment, the cable connection of the sound signal is the same as that of the conventional PEQ, and no additional signal cable connection or dedicated musical instrument is required. That is, since the signal processing device 1 according to the present embodiment has the same audio signal input/output interface as the conventional signal processing device including PEQ, it can be directly replaced in place of the conventional signal processing device.

Further, the signal processing device 1 according to the present embodiment includes a PEQ 12 and a sound signal output section 13. The PEQ 12 adds a predetermined sound effect to the sound signal input from the sound signal input section 11 based on the set frequency set by the setting processing section 16. The sound signal output unit 13 outputs a sound signal (output sound signal) to which a predetermined sound effect is added by the PEQ 12.
Thereby, the signal processing device 1 according to the present embodiment uses the sound signal input from the sound signal input section 11 as an input to the PEQ 12 in addition to setting the frequency, and outputs the sound signal with an acoustic effect added by the PEQ 12. Can be done.

Furthermore, in this embodiment, the effector may include at least one of a parametric equalizer (PEQ12), a high-pass filter, and a low-pass filter.
Thereby, the signal processing device 1 according to the present embodiment can intuitively and easily set the frequency of the parametric equalizer (PEQ12).

In the present embodiment, the setting processing unit 16 also specifies the frequency of the sound signal in a sound signal frequency identification process that extracts the frequency peak of the input sound and identifies the lowest peak frequency corresponding to the fundamental tone. If this is not possible, do not change the set frequency. That is, the setting processing unit 16 does not update the setting of the set frequency when the frequency of the sound signal cannot be specified.
Thereby, the signal processing device 1 according to the present embodiment can reliably set the set frequency of the PEQ 12 to the frequency intended by the user, for example, when a single note is clearly input.

Further, in the signal processing method according to the present embodiment, the frequency designation switch 14 instructs the setting frequency of the PEQ 12 that adds a predetermined acoustic effect to the sound signal received by the sound signal input unit 11 that receives the input sound signal. Then, the setting processing section 16 specifies the frequency of the sound signal input from the sound signal input section 11 based on the instruction from the frequency designation switch 14, and sets the frequency of the specified sound signal as the set frequency of the PEQ 12. .
Thereby, the signal processing method according to the present embodiment has the same effect as the signal processing device 1 described above, can easily set the frequency of the PEQ 12, and can improve convenience.

Note that the present invention is not limited to the above-described embodiments, and can be modified without departing from the spirit of the present invention.
For example, in the above embodiment, a parametric equalizer (PEQ12) was described as an example of the effector, but the effector is not limited to this, and the effector may include a high pass filter, low pass filter, notch filter, band pass filter. It may also be applied to other effectors that require frequency settings such as.

Furthermore, in the above embodiment, the PEQ 12 provides an example in which the setting processing section 16 adds a predetermined sound effect to the sound signal input from the same sound signal input section 11 as the sound signal used to set the setting frequency. Although described above, a predetermined sound effect may be added to sound signals input from different sound signal input units. For example, the signal processing device 1 includes a plurality of sound signal input sections, sets a set frequency using a sound signal input to one of the plurality of sound signal input sections, and sets a set frequency using a sound signal input from another sound signal input section. A predetermined sound effect may be added to the generated sound signal.

Further, in the above embodiment, an example has been described in which the signal processing device 1 includes the PEQ 12 and the sound signal output section 13, but the present invention is not limited to this, and the signal processing device 1 may include the PEQ 12 outside the signal processing device 1. The signal processing device 1 may include a sound signal output section 13 and function as a setting device. In this case, the signal processing device 1 can be used to set an external effector such as PEQ, and the degree of freedom of sound effects that can be easily set can be increased.

Further, in the above embodiment, an example has been described in which the setting processing unit 16 sets one frequency such as the frequency of the fundamental tone to the PEQ 12 as the setting frequency, but the setting processing unit 16 is not limited to this. For example, a series of overtones such as a fundamental tone and overtones, and a plurality of set frequencies may be set in PEQ12. In this case, the harmonic series may include low harmonics, even harmonics, odd harmonics, and arbitrary n harmonics.

In this way, the setting processing unit 16 may specify the frequency of the overtone series including the fundamental tone and overtones of the input sound signal, and set the frequency of the specified overtone series as the set frequency of the PEQ 12. Thereby, the signal processing device 1 can set a plurality of frequencies at once, and can further improve convenience.
Furthermore, in the embodiment described above, when a chord is input instead of a single note to the input sound signal, the setting processing section 16 may similarly set the frequency for each interval constituting the chord.

Further, in the above embodiment, an example has been described in which the setting processing unit 16 sets the frequency and parameters of the PEQ 12 individually, but the invention is not limited to this, and the parameters are changed in conjunction with the frequency. You may also do so. For example, when the setting processing unit 16 sets a plurality of frequencies of the overtone series, the gain of the overtones may be changed (set) in conjunction. In this case, the setting processing unit 16 may, for example, make all the gains the same through interlocking, or make the gains smaller as the frequency becomes higher.

Further, in the above embodiment, the setting processing section 16 may relatively finely adjust the set frequency using the adjustment switch 15. Furthermore, in addition to setting the setting frequency from the input sound signal, the setting processing section 16 may also set parameters such as the gain of the PEQ 12 from the signal level of the input sound signal. In this case, the setting processing unit 16 may, for example, increase the gain when the signal level of the input sound signal is high, and decrease the gain (for example, to a negative value) when the signal level is low.

Furthermore, in the above embodiment, an example has been described in which the setting processing unit 16 does not change the setting frequency when the frequency of the sound signal cannot be specified. , lighting of a light emitting element indicating failure, etc.) may be notified.

Furthermore, in the embodiments described above, the signal processing device 1 may be, for example, an electronic device such as a smartphone, a tablet terminal device, or a PC (personal computer) in addition to the audio device.

Note that each component included in the signal processing device 1 described above has a computer system therein. Then, a program for realizing the functions of each component included in the signal processing device 1 described above is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. Processing in each configuration included in the signal processing device 1 described above may be performed by using the above-mentioned configuration. Here, "reading a program recorded on a recording medium into a computer system and executing it" includes installing the program on the computer system. The "computer system" here includes hardware such as an OS and peripheral devices.
Further, a "computer system" may include a plurality of computer devices connected via a network including the Internet, a WAN, a LAN, a communication line such as a dedicated line, etc. Furthermore, the term "computer-readable recording medium" refers to portable media such as flexible disks, magneto-optical disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into computer systems. In this way, the recording medium storing the program may be a non-transitory recording medium such as a CD-ROM.

The recording medium also includes a recording medium provided internally or externally that can be accessed from the distribution server for distributing the program. Note that the program may be divided into a plurality of parts, downloaded at different timings, and then combined with each component of the signal processing device 1, or the distribution servers that distribute each of the divided programs may be different. Furthermore, a ``computer-readable recording medium'' refers to a storage medium that retains a program for a certain period of time, such as volatile memory (RAM) inside a computer system that serves as a server or client when a program is transmitted via a network. This shall also include things. Moreover, the above-mentioned program may be for realizing part of the above-mentioned functions. Furthermore, it may be a so-called difference file (difference program) that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

Further, some or all of the functions described above may be realized as an integrated circuit such as an LSI (Large Scale Integration). Each of the above-mentioned functions may be implemented as an individual processor, or some or all of them may be integrated into a processor. Moreover, the method of circuit integration is not limited to LSI, but may be implemented using a dedicated circuit or a general-purpose processor. Further, if an integrated circuit technology that replaces LSI emerges due to advances in semiconductor technology, an integrated circuit based on this technology may be used.

DESCRIPTION OF SYMBOLS 1... Signal processing device, 11... Sound signal input part, 12... PEQ, 13... Sound signal output part, 14... Frequency designation switch, 15... Adjustment switch, 16... Setting processing part, 161... Frequency extraction part, 162... Frequency Setting section, 163...Parameter adjustment section

Claims (7)

a sound signal input section;
an instruction unit that instructs setting of a set frequency of an effector that adds a predetermined sound effect to the sound signal;
Based on the instruction from the instruction section, specify the frequency of the sound signal input from the sound signal input section and which is the target sound of playing the musical instrument, and determine the frequency of the specified sound signal. a setting processing unit that sets a setting frequency of the effector ;
The setting processing section includes:
The frequency contained in the sound signal input from the sound signal input section is extracted, and the extracted frequency is not a single frequency, but the extracted frequency is a harmonic that includes the fundamental tone of the sound signal and overtones that are integral multiples of the fundamental tone. If the column is not configured, it is determined that the set frequency could not be correctly identified, and
If the frequency of the sound signal cannot be specified, the setting of the set frequency is not updated.
Signal processing device. the effector that adds the predetermined sound effect based on the set frequency set by the setting processing unit;
The signal processing device according to claim 1, further comprising: a sound signal output section that outputs an output sound signal to which the predetermined sound effect is added by the effector. The signal processing device according to claim 2, wherein the effector adds a sound effect to the sound signal input from the sound signal input section. The signal processing device according to any one of claims 1 to 3, wherein the effector includes at least one of a parametric equalizer, a high-pass filter, and a low-pass filter. The setting processing unit specifies a frequency of a harmonic series including a fundamental tone and overtones of the sound signal, and sets the frequency of the identified harmonic series as a setting frequency of the effector. The signal processing device described in section. an instruction unit instructs setting of a set frequency of an effector for adding a predetermined sound effect to the sound signal;
The setting processing section specifies the frequency of the sound signal input from the sound signal input section, which is the target sound of the musical instrument, based on the instruction from the instruction section, and outputs the specified sound. setting the frequency of the signal to the set frequency of the effector,
The setting processing unit,
A frequency included in the sound signal input from the sound signal input section is extracted, and the extracted frequency is not a single frequency, but the extracted frequency is a harmonic that includes the fundamental tone of the sound signal and overtones that are integral multiples of the fundamental tone. If the column is not configured, it is determined that the set frequency could not be correctly identified, and
If the frequency of the sound signal cannot be specified, the setting of the set frequency is not updated.
Signal processing method. A computer of a signal processing device including a sound signal input section and an instruction section for instructing setting of a set frequency of an effector that adds a predetermined sound effect to the sound signal,
a frequency specifying step of specifying a frequency of a sound signal input from the sound signal input section and which is the target sound of playing a musical instrument, based on an instruction from the instruction section;
a frequency setting step of setting the frequency of the sound signal specified in the frequency specifying step to a set frequency of the effector ;
In the frequency specifying step, a frequency included in the sound signal input from the sound signal input section is extracted, and the extracted frequency is not a single frequency, and the extracted frequency is a fundamental tone of the sound signal and an integer of the fundamental tone. If a harmonic series including double harmonics is not configured, it is determined that the set frequency could not be correctly identified,
In the frequency setting step, if the frequency of the sound signal cannot be specified, the setting of the set frequency is not updated.
program .

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