Signal processing device, stringed instrument, and program

Abstract

To dynamically change settings of an equalizer in accordance with performance.SOLUTION: Provided is a signal processing device including: an acquisition unit that acquires fingering information concerning fingering of a stringed instrument; and a setting unit that sets, as parameters, a frequency and level adjustment information in an equalizer. The frequency is a frequency corresponding to the fingering information. The level adjustment information is information for adjusting a signal level of a sound signal of the frequency in accordance with the signal level. The setting unit changes the frequency when the fingering information is changed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a signal processing device, a stringed instrument, and a program. [Background technology]

[0002] 2. Description of the Related Art In recent years, a signal processing device has been known that uses an equalizer (EQ) to solve problems such as feedback in musical instrument performance (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2017 / 126281 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional signal processing devices, the settings of the equalizer frequency and the like are fixed and must be set in advance. Also, in the conventional signal processing devices, once the settings of the frequency and the like are set, it is difficult to dynamically change them during a performance.

[0005] The present invention has been made to solve the above problems, and has an object to provide a signal processing device, a stringed instrument, and a program that are capable of dynamically changing equalizer settings in accordance with a performance. [Means for solving the problem]

[0006] In order to solve the above problems, one aspect of the present invention is a signal processing device that includes an acquisition unit that acquires fingering information related to fingering for a stringed instrument, and a setting unit that sets frequency and level adjustment information to an equalizer as parameters, wherein the frequency is a frequency that corresponds to the fingering information, the level adjustment information is information that adjusts the signal level in accordance with the signal level of a sound signal of the frequency, and the setting unit changes the frequency when the fingering information is changed.

[0007] Moreover, one aspect of the present invention is a signal processing device that includes an acquisition unit that acquires vibration information related to vibrations emitted by a stringed instrument, or pitch information related to the pitch of a sound emitted by a stringed instrument, and a setting unit that sets frequency and level adjustment information as parameters to an equalizer, wherein the frequency corresponds to fingering information related to fingering of the stringed instrument, the level adjustment information is information that adjusts the signal level in accordance with the signal level of a sound signal of the frequency, and the setting unit changes the frequency when the fingering information is changed.

[0008] Another aspect of the present invention is a program for causing a computer to execute a process of acquiring fingering information regarding fingering for a stringed instrument, changing a frequency to a frequency corresponding to the fingering information as a parameter based on the acquired fingering information, and setting level adjustment information for adjusting the signal level in an equalizer according to the signal level of a sound signal of the changed frequency.

[0009] Another aspect of the present invention is a program for causing a computer to execute a process of acquiring vibration information regarding vibrations produced by a stringed instrument, or pitch information regarding the pitch of a sound produced by a stringed instrument, changing a frequency to a frequency corresponding to the acquired information as a parameter based on the acquired information, and setting level adjustment information for adjusting the signal level in an equalizer according to the signal level of a sound signal of the changed frequency. Effect of the Invention

[0010] According to the present invention, the equalizer settings can be dynamically changed in response to the performance. [Brief description of the drawings]

[0011] [Figure 1] 1 is a block diagram showing an example of a signal processing device according to a first embodiment. [Diagram 2] 5 is a diagram illustrating an example of data in a setting storage unit in the first embodiment. FIG. [Diagram 3] 5 is a flowchart showing an example of a parameter setting process according to the first embodiment. [Figure 4] 5 is a flowchart showing an example of sound signal processing in the first embodiment. [Diagram 5] FIG. 2 is a diagram illustrating an example of an operation of the signal processing device according to the first embodiment. [Figure 6] FIG. 11 is a diagram illustrating another example of the operation of the signal processing device according to the first embodiment. [Figure 7] 5A to 5C are diagrams illustrating an example of processing in response to a change in fingering information in the signal processing device according to the first embodiment. [Figure 8] FIG. 11 is a block diagram showing an example of a signal processing device according to a second embodiment. [Figure 9] 10 is a flowchart showing an example of a parameter setting process according to the second embodiment. [Figure 10] FIG. 11 is a diagram illustrating an example of an operation of the signal processing device according to the second embodiment. [Figure 11] FIG. 11 is a configuration diagram showing an example of a stringed instrument according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A signal processing device, a stringed instrument, a signal processing method, and a program according to an embodiment of the present invention will be described below with reference to the drawings.

[0013] [First embodiment] 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 processing unit 11, a signal output unit 12, a setting storage unit 13, and a control unit . The signal processing device 1 performs sound signal processing using an equalizer on a sound signal generated by playing a stringed instrument such as a guitar, and outputs the processed sound signal. The signal processing device 1 is, for example, an audio device such as an effector.

[0014] In this embodiment, a case will be described in which the stringed instrument is a guitar. The pickup unit 2 converts the vibration of the guitar strings into a sound signal and outputs the converted sound signal as a pickup signal to the signal processing device 1. The pickup unit 2 may be of a type that detects the vibration of the guitar strings, or of a type that collects sound with a microphone. The fingering information detection unit 3 detects fingering information of the guitar. The fingering information detection unit 3 detects the pressed string number and pressed fret number pressed by the performer's fingers as fingering information. The pressed string number indicates the number of the string pressed by the user's playing, and the pressed fret number indicates the number of the fret where the string is pressed by the user's playing. The fingering information detection unit 3 outputs the detected fingering information to the signal processing device 1. Note that the pressed string number and pressed fret number also include the open fret state where the string is not pressed.

[0015] The sound signal processing unit 11 performs sound signal processing by an equalizer on the input sound signal based on the set parameters. For example, the sound signal processing unit 11 acquires a pickup signal (sound signal) obtained by converting the vibration of a guitar string into a sound signal by the pickup unit 2, performs sound signal processing by an equalizer based on the parameters on the acquired pickup signal, and outputs an output sound signal obtained by sound signal processing of the pickup signal to the signal output unit 12. The sound signal processing unit 11 includes, for example, a DSP (Digital Signal Processor), and realizes the function of an equalizer by digital signal processing by the DSP.

[0016] The sound signal processing unit 11 may perform sound signal processing for each pickup signal corresponding to each string of the guitar, or may perform sound signal processing on a pickup signal obtained by mixing the pickup signals corresponding to each string.

[0017] The signal output unit 12 (an example of an output unit) is, for example, a digital to analog converter (DAC) and an output amplifier, and outputs an output sound signal obtained by subjecting the pickup signal to sound signal processing by the sound signal processing unit 11.

[0018] The setting storage unit 13 stores information for a parameter setting unit 142 (described later) to determine equalizer parameters. The setting storage unit 13 stores setting information (such as a setting table or a setting function) that associates fingering information with parameters.

[0019] An example of data in the setting storage unit 13 will be described with reference to FIG. FIG. 2 is a diagram showing an example of data in the setting storage unit 13 in this embodiment. As shown in FIG. 2, the setting storage unit 13 stores a frequency and level adjustment information in association with a pressed string number and a pressed fret number. The pressed string number and pressed fret number are examples of fingering information, the frequency indicates the frequency of the equalizer, and the level adjustment information is, for example, the gain of the equalizer and a Q value that determines the bandwidth for setting the gain.

[0020] 2 shows that the frequency of the fundamental tone corresponding to the first string and the fret number 0 (open) is 330Hz, and the level adjustment information is G101dB (gain) and width Q101 (Q value). It also shows that the frequency of the second harmonic tone corresponding to the first string and the fret number 0 (open) is 660Hz, and the level adjustment information is G102dB (gain) and width Q102 (Q value).

[0021] 2 shows an example in which three frequencies, the fundamental, the second harmonic, and the third harmonic, are set as frequencies corresponding to the pressed string number and the pressed fret number, but multiple frequencies of four or more harmonic overtones and level adjustment information may be set, or one frequency and level adjustment information may be set. When one frequency is set, the frequency of the fundamental, which is the basic frequency corresponding to the pressed string number and the pressed fret number, may be set.

[0022] Returning to the explanation of FIG. 1, the control unit 14 includes, for example, a fingering information acquisition unit 141, a parameter setting unit 142, and a setting information change unit 143.

[0023] The fingering information acquisition unit 141 (an example of a fingering information acquisition unit) acquires fingering information of a guitar (a stringed instrument). That is, the fingering information acquisition unit 141 acquires fingering information from the fingering information detection unit 3.

[0024] The parameter setting unit 142 sets equalizer parameters based on the fingering information acquired by the fingering information acquisition unit 141. The parameter setting unit 142 sets parameters based on, for example, setting information (setting table) stored in the setting storage unit 13. That is, the parameter setting unit 142 acquires parameters (frequency and level adjustment information) corresponding to the fingering information (pressed string number and pressed fret number) from the setting storage unit 13, and sets the acquired parameters (frequency and level adjustment information) in the sound signal processing unit 11.

[0025] In this way, the parameter setting unit 142 sets the frequency and level adjustment information corresponding to the fingering information as parameters. The frequency corresponding to the fingering information includes the frequencies of the fundamental tone and overtones corresponding to the fingering information. In this case, the parameter setting unit 142 sets the frequencies of the fundamental tone and overtones corresponding to the fingering information as parameters in accordance with the fingering information. The fingering information also includes a string pressing number that indicates the string number used in the guitar fingering. The parameter setting unit 142 sets parameters corresponding to the fingering for each string based on the string pressing number.

[0026] The setting information changing unit 143 writes setting information to the setting storage unit 13 or changes the setting information in the setting storage unit 13 based on an instruction from an external device (not shown). For example, when adjusting a parameter in accordance with the characteristics of a guitar or customizing a parameter, the setting information changing unit 143 stores the setting information acquired from the external device in the setting storage unit 13 based on an instruction from the external device.

[0027] The operation of the signal processing device 1 according to this embodiment will be described with reference to the drawings. First, the parameter setting process of the signal processing device 1 according to the present embodiment will be described with reference to FIG.

[0028] FIG. 3 is a flowchart showing an example of a parameter setting process in this embodiment. 3, in the parameter setting process, the control unit 14 of the signal processing device 1 first acquires fingering information (step S101). That is, the fingering information acquisition unit 141 of the control unit 14 acquires the fingering information (e.g., pressed string number and pressed fret number) detected by the fingering information detection unit 3.

[0029] Next, the parameter setting unit 142 of the control unit 14 determines parameters according to the fingering information (step S102). The parameter setting unit 142 acquires, for example, frequency and level adjustment information corresponding to the pressed string number and pressed fret number, which are the fingering information, from the setting storage unit 13, and sets the frequency and level adjustment information as parameters.

[0030] Next, the parameter setting unit 142 sets the parameters in the equalizer (step S103). That is, the parameter setting unit 142 sets the parameters in the sound signal processing unit 11 to change the characteristics of the sound signal processing. After the process of step S103, the parameter setting unit 142 returns the process to step S101.

[0031] In this way, in the parameter setting process of the signal processing device 1, the processes from step S101 to step S103 are periodically repeated, and the equalizer parameters in the sound signal processing are changed according to the fingering of the guitar. In this embodiment, for example, when the chord is changed by fingering, it is possible to change the sound signal processing (equalizer) parameters before the pickup unit 2 picks up the vibration of the strings.

[0032] Next, the sound signal processing of the signal processing device 1 according to this embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing an example of sound signal processing in this embodiment. 4, when performing sound signal processing, the sound signal processing unit 11 of the signal processing device 1 first acquires a pickup signal (step S201). That is, the sound signal processing unit 11 acquires a pickup signal (sound signal) input from the pickup unit 2.

[0033] Next, the sound signal processing unit 11 operates the equalizer according to the parameters to perform sound signal processing on the pickup signal (step S202). That is, the sound signal processing unit 11 performs sound signal processing on the input sound signal by the equalizer based on the parameters set by the parameter setting unit 142.

[0034] Next, the sound signal processing unit 11 causes the signal output unit 12 to output the sound signal that has been subjected to the sound signal processing (step S203). The sound signal processing unit 11 outputs the sound signal that has been subjected to the sound signal processing to the signal output unit 12, and the signal output unit 12 outputs the sound signal to the outside. After the processing of step S203, the sound signal processing unit 11 returns the processing to step S201.

[0035] In this way, the signal processing device 1 according to the present embodiment processes the input pickup signal with parameters changed in accordance with fingering information, and outputs the processed sound signal.

[0036] Next, an example of a specific operation of the signal processing device 1 according to the present embodiment will be described with reference to FIGS. FIG. 5 is a diagram showing an example of the operation of the signal processing device 1 according to the present embodiment. 5, the vertical axis of the graph indicates the signal level, and the horizontal axis indicates the frequency, and the equalizer characteristic Ec0 indicates the frequency characteristic of the equalizer set based on the fingering information.

[0037] In the example shown in FIG. 5, for example, the first and second strings are pressed, and frequency F11 indicates the frequency of the fundamental tone corresponding to the first string, frequency F12 indicates the frequency of the second harmonic tone corresponding to the first string, and frequency F13 indicates the frequency of the third harmonic tone corresponding to the first string. Furthermore, frequency F21 indicates the frequency of the fundamental tone corresponding to the second string, frequency F22 indicates the frequency of the second harmonic tone corresponding to the second string, and frequency F23 indicates the frequency of the third harmonic tone corresponding to the first string. In FIG. 5, the signal level of the fundamental frequency is indicated by a solid bar graph, the signal level of the second harmonic frequency is indicated by a dashed line, and the signal level of the third harmonic frequency is indicated by a dotted line.

[0038] 5 is an example of performing sound signal processing to adjust the signal level of the fundamental tone frequency corresponding to the fingering information, where the parameter setting unit 142 performs a setting to amplify the signal level for the frequency F11 corresponding to the first string, as indicated by parameter P1, and a setting to reduce the signal level for the frequency F21 corresponding to the second string, as indicated by parameter P2.

[0039] In this case, the sound signal processing unit 11 performs sound signal processing on the pickup signal by operating an equalizer according to the frequency characteristics indicated by the equalizer characteristic Ec0, and outputs the sound signal that has been subjected to sound signal processing to the outside via the signal output unit 12.

[0040] Moreover, Fig. 6 is a diagram showing another example of the operation of the signal processing device 1 according to this embodiment. The example shown in Fig. 6 is an example of performing sound signal processing to adjust the signal levels of the fundamental tone, the second harmonic tone, and the third harmonic tone frequencies corresponding to the fingering information, and as shown in the equalizer characteristic Ec1, the frequency characteristic of the equalizer set based on the fingering information is different from the example shown in Fig. 5 described above. Note that other parts are the same as those in Fig. 5 described above.

[0041] 6, the parameter setting unit 142 performs settings to amplify the signal levels of, for example, a frequency F11 (fundamental tone), a frequency F12 (second harmonic), and a frequency F13 (third harmonic) corresponding to the first string, as shown by parameters P11, P12, and P13, respectively. Also, the parameter setting unit 142 performs settings to reduce the signal levels of, for example, a frequency F21 (fundamental tone), a frequency F22 (second harmonic), and a frequency F23 (third harmonic) corresponding to the second string, as shown by parameters P21, P22, and P23, respectively.

[0042] In this case, the sound signal processing unit 11 performs sound signal processing on the pickup signal by operating an equalizer according to the frequency characteristics indicated by the equalizer characteristic Ec1, and outputs the sound signal after sound signal processing to the outside via the signal output unit 12.

[0043] Next, with reference to FIG. 7, an operation of the signal processing device 1 according to the present embodiment in response to a change in fingering information will be described. FIG. 7 is a diagram for explaining the difference in processing according to changes in fingering information in the signal processing device 1 according to the present embodiment. Fig. 7(a) shows the equalizer parameters set in the fingering state c1 shown in Fig. 6. Also, Fig. 7(b) shows the fingering state c2 in which the fingering information for the first string has changed from the fingering state c1.

[0044] In Fig. 7(b), when the fingering position of the first string changes and the fingering state transitions from c1 to c2, the parameter setting unit 142 changes the setting of the equalizer parameters from the frequency characteristic shown in the equalizer characteristic Ec1 in Fig. 7(a) to the frequency characteristic shown in the equalizer characteristic Ec2. That is, the parameter setting unit 142 sets the signal levels of the frequency F11a (fundamental tone), frequency F12a (second harmonic tone), and frequency F13a (third harmonic tone) corresponding to the fret number pressed in the fingering state c2 of the first string to be reduced as shown in parameters P11a, P12a, and P13a, respectively.

[0045] In this case, the sound signal processing unit 11 performs sound signal processing on the pickup signal by operating the equalizer with frequency characteristics that have been changed from the equalizer characteristics Ec1 for fingering state c1 to the equalizer characteristics Ec2 for fingering state c2, and outputs the sound signal that has been sound signal processed to the outside via the signal output unit 12. In this way, in the signal processing device 1 according to the present embodiment, the equalizer parameters can be changed before picking up (before sound is produced) according to the fingering state, and sound signal processing can be changed.

[0046] As described above, the signal processing device 1 according to this embodiment includes a fingering information acquisition unit 141, a parameter setting unit 142, a sound signal processing unit 11, and a signal output unit 12. The fingering information acquisition unit 141 acquires fingering information of a guitar (a stringed instrument). The parameter setting unit 142 sets equalizer parameters based on the fingering information acquired by the fingering information acquisition unit 141. The sound signal processing unit 11 executes sound signal processing by the equalizer on the input sound signal based on the parameters set by the parameter setting unit 142. The signal output unit 12 outputs an output sound signal obtained by performing sound signal processing on the sound signal by the sound signal processing unit 11.

[0047] As a result, the signal processing device 1 according to this embodiment changes parameters according to fingering information, and therefore can dynamically change the equalizer settings according to the performance. Also, since the signal processing device 1 according to this embodiment changes parameters according to fingering information, it is possible to reduce the volume variation for each pitch of the stringed instrument by changing the equalizer settings for each pitch of the stringed instrument corresponding to the fingering information.

[0048] In addition, in conventional signal processing devices, it is necessary to set the equalizer before a performance, and it is difficult to dynamically change the settings during a performance. In contrast, in the signal processing device 1 according to the present embodiment, the equalizer parameters can be changed according to fingering information, so that it can appropriately handle, for example, various intervals and harmonies (chords).

[0049] In this embodiment, the parameters include a frequency and level adjustment information for adjusting a signal level of a sound signal corresponding to the frequency. The parameter setting unit 142 sets a frequency and level adjustment information corresponding to fingering information as parameters. The sound signal processing unit 11 adjusts a signal level of a frequency corresponding to the fingering information based on the level adjustment information as sound signal processing. This allows the signal processing device 1 according to the present embodiment to appropriately change the equalizer settings in accordance with the fingering information.

[0050] In the present embodiment, the frequency corresponding to the fingering information includes the frequencies of the fundamental tone and overtones corresponding to the fingering information. The parameter setting unit 142 sets the frequencies of the fundamental tone and overtones corresponding to the fingering information as parameters in accordance with the fingering information. This allows the signal processing device 1 according to the present embodiment to more appropriately change the equalizer settings in accordance with the fingering information.

[0051] In this embodiment, the fingering information includes a pressed string number indicating the string number used in fingering a guitar (stringed instrument). The parameter setting unit 142 sets parameters corresponding to the fingering for each string based on the pressed string number. The pressed string number is an example of string number information. As a result, the signal processing device 1 according to the present embodiment can change the equalizer settings in accordance with the fingering for each string, allowing for highly flexible setting changes.

[0052] The signal processing device 1 according to the present embodiment further includes a setting storage unit 13 that stores setting information in which fingering information and parameters are associated with each other. The parameter setting unit 142 sets parameters based on the setting information stored in the setting storage unit 13. As a result, the signal processing device 1 according to the present embodiment can appropriately change the equalizer settings according to the fingering information. For example, by changing the setting information stored in the setting storage unit 13, individual variations in guitars (stringed instruments) can be easily adjusted and customization by the user can be easily performed.

[0053] Furthermore, the signal processing method according to this embodiment is a signal processing method for a signal processing device 1 that includes a sound signal processing unit 11 that performs sound signal processing using an equalizer on a sound signal, and a signal output unit 12 that outputs an output sound signal resulting from sound signal processing performed on the sound signal by the sound signal processing unit 11, in which the fingering information acquisition unit 141 acquires guitar fingering information (fingering information acquisition step), the parameter setting unit 142 sets equalizer parameters based on the fingering information acquired by the fingering information acquisition unit 141 (parameter setting step), and the sound signal processing unit 11 performs sound signal processing using the equalizer on the input sound signal based on the parameters set by the parameter setting unit 142 (sound signal processing step). As a result, the signal processing method according to the present embodiment has the same effect as the signal processing device 1 described above, and can dynamically change the equalizer settings in response to the performance.

[0054] [Second embodiment] Next, a signal processing device 1a according to a second embodiment will be described with reference to the drawings. In this embodiment, a modified example in which an equalizer parameter is changed according to the signal level of a predetermined frequency of a sound signal will be described.

[0055] FIG. 8 is a block diagram showing an example of a signal processing device 1a according to the second embodiment. As shown in FIG. 8, the signal processing device 1a includes a sound signal processing unit 11, a signal output unit 12, a setting storage unit 13, a control unit 14a, and a level detection unit 15. In Fig. 8, the same components as those shown in Fig. 1 are denoted by the same reference numerals, and the description thereof will be omitted. In this embodiment, the signal processing device 1a includes a level detection unit 15, and the process by the control unit 14a is different from that in the first embodiment.

[0056] The level detection unit 15 detects the signal level (detection signal level) of a predetermined frequency of the sound signal. The level detection unit 15 detects, for example, the signal level of a frequency designated by the control unit 14a from among the pickup signals output by the pickup unit 2. The level detection unit 15 detects the signal level of the designated frequency by using, for example, a band pass filter or FFT (Fast Fourier Transform) processing.

[0057] The control unit 14 a includes a fingering information acquisition unit 141 , a parameter setting unit 142 a , and a setting information change unit 143 .

[0058] The parameter setting unit 142a sets equalizer parameters based on the fingering information acquired by the fingering information acquisition unit 141. The parameter setting unit 142a sets parameters according to the detection signal level detected by the level detection unit 15 and the fingering information. The parameter setting unit 142a acquires, for example, parameters (frequency and level adjustment information) corresponding to the fingering information (pressed string number and pressed fret number) from the setting storage unit 13. The parameter setting unit 142a sets the acquired frequency in the level detection unit 15. The parameter setting unit 142a sets the parameter in the sound signal processing unit 11 according to the detection signal level of the frequency detected by the level detection unit 15.

[0059] For example, when suppressing howling, the parameter setting unit 142a sets level adjustment information in the sound signal processing unit 11 to reduce the level of the sound signal of the frequency corresponding to the fingering information based on the level adjustment information when the signal level of the frequency detected by the level detection unit 15 is equal to or higher than a predetermined threshold value. As a result, the sound signal processing unit 11 executes sound signal processing using the equalizer to reduce the level of the sound signal of the frequency corresponding to the fingering information when the signal level of the frequency corresponding to the fingering information is equal to or higher than a predetermined threshold value.

[0060] Next, the operation of the signal processing device 1a according to this embodiment will be described with reference to the drawings. First, the parameter setting process of the signal processing device 1a according to this embodiment will be described with reference to FIG.

[0061] FIG. 9 is a flowchart showing an example of the parameter setting process in this embodiment. 9, in the parameter setting process, the control unit 14a of the signal processing device 1a first acquires fingering information (step S301). That is, the fingering information acquisition unit 141 of the control unit 14a acquires the fingering information detected by the fingering information detection unit 3.

[0062] Next, the parameter setting unit 142a of the control unit 14a determines parameters according to the fingering information and the signal level of a predetermined frequency (step S302). The parameter setting unit 142a acquires, for example, frequency and level adjustment information corresponding to the fingering information, such as the pressed string number and pressed fret number, from the setting storage unit 13, and acquires the detection signal level of the frequency corresponding to the fingering information detected by the level detection unit 15. For example, when the signal level of the frequency corresponding to the fingering information is equal to or higher than a predetermined threshold, the parameter setting unit 142a sets the frequency and level adjustment information as parameters.

[0063] Next, the parameter setting unit 142a sets the parameters in the equalizer (step S303). That is, the parameter setting unit 142a sets the parameters in the sound signal processing unit 11 to change the characteristics of the sound signal processing. After the process of step S303, the parameter setting unit 142a returns the process to step S301.

[0064] Next, with reference to FIG. 10, an operation of the signal processing device 1a according to the present embodiment in response to a change in fingering information will be described. FIG. 10 is a diagram showing an example of the operation of the signal processing device 1a according to this embodiment. FIG. 10(a) shows, for example, the signal levels and frequency characteristics of the frequencies (fundamentals) corresponding to the first to sixth strings in fingering state c3.

[0065] In Fig. 10(a), frequencies F1 to F6 indicate frequencies corresponding to the first to sixth strings in a fingering state c3, respectively. Furthermore, equalizer characteristics Ec3 indicate frequency characteristics of the equalizer set based on fingering information in the fingering state c3. In the example shown in Fig. 10(a), the parameter setting unit 142a sets the parameters of the equalizer so that the frequency characteristics are as shown in the equalizer characteristics Ec3 when the signal level of the frequency F5 corresponding to the fifth string becomes equal to or higher than a predetermined threshold Lth. In this case, the parameter setting unit 142a sets the signal level of the frequency F5 to reduce the signal level in order to prevent feedback when the signal level of the frequency F5 becomes equal to or higher than the predetermined threshold Lth.

[0066] In this case, when the signal level of frequency F5 for the pickup signal is equal to or higher than a predetermined threshold value Lth, the sound signal processing unit 11 operates the equalizer according to the frequency characteristics indicated by the equalizer characteristic Ec3 to perform sound signal processing, and outputs the sound signal-processed output sound signal to the outside via the signal output unit 12.

[0067] FIG. 10(b) also shows, for example, the signal levels and frequency characteristics of the frequencies (fundamentals) corresponding to the first to sixth strings in a fingering state c4 in which the fingering information of the second string has changed from the fingering state c3. In this case, the parameter setting unit 142a adds a parameter when the signal level of the frequency F2a corresponding to the fret number of the second string becomes equal to or above a predetermined threshold Lth in response to a change in the fret number of the second string to the equalizer characteristic Ec3, and sets the equalizer parameters so as to obtain the frequency characteristics shown in the equalizer characteristic Ec4. In this case, the parameter setting unit 142a sets the signal level of the frequency F5 to be reduced in order to prevent feedback when the signal level of the frequency F5 becomes equal to or above the predetermined threshold Lth, and sets the signal level of the frequency F2a to be reduced in order to prevent feedback when the signal level of the frequency F2a becomes equal to or above the predetermined threshold Lth.

[0068] In this case, the sound signal processing unit 11 performs sound signal processing on the pickup signal by operating the equalizer with the frequency characteristics that have been changed from the equalizer characteristics Ec3 for fingering state c3 to the equalizer characteristics Ec4 for fingering state c4, and outputs the sound signal-processed output sound signal to the outside via the signal output unit 12.

[0069] As described above, the signal processing device 1a according to this embodiment includes a parameter setting unit 142a, which sets level adjustment information for lowering the level of a sound signal of a frequency corresponding to fingering information when the signal level of the frequency corresponding to fingering information is equal to or higher than a predetermined threshold (e.g., equal to or higher than threshold Lth). As a result, the signal processing device 1a according to this embodiment can reduce feedback of the sound signal.

[0070] In the signal processing device 1a according to this embodiment, the parameter setting unit 142a performs setting to reduce the signal level of the frequency that is the subject of feedback in order to reduce feedback, and further changes the frequency that is the subject of feedback according to fingering information. Therefore, the signal processing device 1a according to this embodiment can reduce the change in tone due to the feedback countermeasure because the equalizer setting for the feedback countermeasure can be minimized.

[0071] In addition, the signal processing device 1a according to the present embodiment sets a threshold value for the signal level to which the howling countermeasure is applied, so that when no howling occurs, sound signal processing for reducing the signal level is not performed. This allows the signal processing device 1a according to the present embodiment to further reduce changes in tone caused by the howling countermeasure.

[0072] The signal processing device 1a according to this embodiment also includes a level detection unit 15 that detects the signal level of a predetermined frequency of a sound signal. The parameter setting unit 142a sets parameters according to the detection signal level detected by the level detection unit 15 and fingering information. This allows the signal processing device 1a according to this embodiment to change the equalizer settings more dynamically in accordance with the performance.

[0073] In the above-described embodiment, the level detection unit 15 is provided outside the sound signal processing unit 11, and the parameter setting unit 142a changes the equalizer parameters according to the signal level of a predetermined frequency, but the present invention is not limited to this. For example, the sound signal processing unit 11 may be provided with the level detection unit 15, and may switch whether or not to apply the set parameters according to the signal level of a predetermined frequency. In this embodiment, the setting storage unit 13 may store setting information including a threshold value for the signal level.

[0074] [Third embodiment] Next, as a third embodiment, a modified example in which the signal processing device 1 (1a) according to the first and second embodiments is provided in a stringed instrument will be described. Here, a form in which a guitar is provided with the signal processing device 1 (1a) as an example of a stringed instrument will be described.

[0075] FIG. 11 is a diagram showing the configuration of an example of a stringed instrument according to this embodiment. As shown in FIG. 11, a guitar 4 includes a pickup unit 2, a fingering information detection unit 3, and a signal processing device 1 (1a).

[0076] The fingering information detection unit 3 is disposed, for example, on the neck of the guitar 4, detects fingering information for each string, and outputs the fingering information for each string to the signal processing device 1 (1a). The pickup section 2 is disposed on the body of the guitar 4, converts vibrations of the strings of the guitar 4 into sound signals, and outputs the converted sound signals to the signal processing device 1 (1a) as pickup signals.

[0077] In the guitar 4, the signal processing device 1 (1a) changes the parameters of the equalizer according to the fingering information detected by the fingering information detection unit 3, processes the pickup signal output by the pickup unit 2 into a sound signal, and outputs it to the outside.

[0078] As described above, the guitar 4 (stringed instrument) according to this embodiment includes the fingering information detection unit 3 that detects fingering information, and the above-mentioned signal processing device 1 (1a). As a result, the guitar 4 (stringed instrument) according to this embodiment has the same effect as the signal processing device 1 (1a) described above, and can dynamically change the equalizer settings according to the performance.

[0079] The present invention is not limited to the above-described embodiments, and can be modified without departing from the spirit of the present invention. In each of the above embodiments, the signal processing device 1 (1a) is an audio device such as an effector, but is not limited thereto, and may be, for example, an electronic device such as a smartphone, a tablet terminal device, a PC (personal computer), etc. Furthermore, the signal processing device 1 (1a) may be in a form in which the sound signal processing unit 11 and the signal output unit 12 are provided externally.

[0080] In addition, in each of the above embodiments, the stringed instrument is a guitar, but the present invention is not limited to this, and may be applied to other instruments such as a bass, a violin, etc. In addition, the above first and second embodiments are described as independent embodiments, but the first and second embodiments may be combined and practiced.

[0081] In the above first embodiment, the signal processing device 1 applies up to three harmonics to the signal processing device 1, but the signal processing device 1 may apply up to four harmonics or more. Furthermore, in the second embodiment, the signal processing device 1a may set the frequencies and level adjustment information of the fundamental tone and overtones, similarly to the first embodiment.

[0082] Each component of the signal processing device 1 (1a) described above has a computer system inside. A program for realizing the function of each component of the signal processing device 1 (1a) described above may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed to perform processing in each component of the signal processing device 1 (1a) described above. Here, "reading a program recorded on a recording medium into a computer system and executing it" includes installing the program into a computer system. The "computer system" referred to here includes hardware such as an OS and peripheral devices. Furthermore, a "computer system" may include multiple computer devices connected via a network including the Internet, WAN, LAN, dedicated lines, and other communication lines. Furthermore, a "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into a computer system. In this way, the recording medium storing the program may be a non-transitory recording medium such as a CD-ROM.

[0083] The recording medium also includes a recording medium installed inside or outside and accessible from a distribution server to distribute the program. The program may be divided into a plurality of parts, downloaded at different times, and then combined by each component of the signal processing device 1 (1a), or each divided program may be distributed by a different distribution server. Furthermore, the "computer-readable recording medium" includes a recording medium that holds a program for a certain period of time, such as a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network. The program may be a recording medium for realizing part of the above-mentioned functions. Furthermore, the program 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.

[0084] In addition, some or all of the above-mentioned functions may be realized as an integrated circuit such as LSI (Large Scale Integration). Each of the above-mentioned functions may be individually processed, or some or all of the functions may be integrated into a processor. The integrated circuit method is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, if an integrated circuit technology that can replace LSI appears due to advances in semiconductor technology, an integrated circuit based on that technology may be used. [Explanation of symbols]

[0085] 1, 1a... signal processing device, 2... pickup section, 3... fingering information detection section, 4... guitar, 11... sound signal processing section, 12... signal output section, 13... setting storage section, 14, 14a... control section, 15... level detection section, 141... fingering information acquisition section, 142, 142a... parameter setting section, 143... setting information change section

Claims

1. an acquisition unit for acquiring fingering information relating to fingering of a stringed instrument; a setting unit for setting frequency and level adjustment information in the equalizer as parameters, the frequency corresponds to the fingering information, the level adjustment information is information for adjusting a signal level in accordance with a signal level of a sound signal of the frequency, The setting unit changes the frequency when the fingering information is changed. Signal processing device.

2. The setting unit is As the level adjustment information, when the signal level of the sound signal of the frequency is equal to or higher than a predetermined threshold, information for lowering the signal level of the sound signal of the frequency is set in the equalizer. The signal processing device according to claim 1 .

3. a processing unit that performs sound signal processing on a sound signal using an equalizer to which the parameters are set, to obtain an output sound signal; an output unit that outputs the obtained output sound signal; The signal processing device according to claim 1 or 2, further comprising:

4. the frequencies include frequencies of fundamental and harmonic tones corresponding to the fingering information, The setting unit sets, as the parameter, level adjustment information for adjusting the signal levels of the sound signals of the fundamental tone and the harmonic tones in the equalizer. The signal processing device according to any one of claims 1 to 3.

5. the fingering information includes string number information indicating string numbers used in fingering of the stringed instrument, The setting unit sets the parameters in the equalizer in correspondence with fingering for each string of the stringed instrument based on the string number information. The signal processing device according to any one of claims 1 to 4.

6. a storage unit for storing setting information that associates the fingering information with the parameters, The setting unit sets the parameters in the equalizer based on the setting information. The signal processing device according to any one of claims 1 to 5.

7. The signal processing device according to any one of claims 1 to 6. A stringed instrument comprising:

8. On the computer, Obtain fingering information regarding fingering of string instruments; The frequency and level adjustment information are set in the equalizer as parameters. the frequency corresponds to the fingering information, the level adjustment information is information for adjusting a signal level in accordance with a signal level of a sound signal of the frequency, In the setting process, the frequency is changed when the fingering information is changed. A program to make it happen.

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