JP2008268310A - Tuning device, tuning method and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tuning device for outputting musical sound with a stable pitch, by correcting the pitch of an input musical sound signal when tuning a musical instrument, even when the sound is untuned. <P>SOLUTION: The tuning device comprises: a pitch detecting section 2 for detecting the pitch of the signal input from an input section 1; a pitch monitoring section 3 for monitoring the detected pitch; a control section 4 for controlling a correction part between the pitch detected by the pitch detecting section 2 and a reference pitch of the pitch monitoring section 3; a musical sound correction section 5 for correcting the pitch according to the correction amount of the pitch controlled by the control section 4. The musical sound signal with pitch is corrected by the musical sound correction section 5, is output by an output section 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tuning device used when tuning the sound of a musical instrument.

  As shown in FIG. 3, a general tuning apparatus has an input unit for inputting a musical tone, an output unit for outputting the input musical tone, and a pitch detection unit for detecting a pitch from the input musical tone. There is a control unit that receives the signal of the unit and calculates the tuning information, there is a display unit that receives the signal of the control unit and displays the tuning information, and there is a setting unit that sets the tuning information from the outside.

  The input unit includes a microphone for inputting the sound of an acoustic guitar, a jack for inputting an electric guitar, and the like. A microcomputer is generally used as a component of the pitch detection unit and the control unit. The pitch detector calculates the pitch by shaping the waveform of the input musical sound signal and counting the edges between the rectangular waves. The control unit composed of a microcomputer or the like includes a measuring means for obtaining the pitch of the musical sound from the detected pitch period, a pitch name / octave discriminating means for discriminating the pitch name / octave of the obtained pitch, and the discriminated sound It is known that pitch error calculation means for calculating a pitch error obtained with respect to the reference pitch of the name and octave, and display the pitch name, octave and pitch error value from the display unit (see, for example, Patent Document 1). ).

Further, as a tuning device for tuning a stringed instrument, a tuning device that detects the pitch of an input signal of a played string and displays a string number corresponding to the detected pitch has been proposed (see, for example, Patent Document 2). .)
JP-A-5-66765 JP 2001-209375 A

  The conventional tuning device calculates the pitch by converting the input musical sound signal into a rectangular wave and counts the period of the rectangular wave, searches the pitch of the musical tone from the obtained pitch, and information on the tuning (such as the pitch name and the pitch). Only display octave and cent error). Further, it only includes an output unit that bypasses the input musical sound signal to the outside as it is. An analog musical instrument such as a stringed instrument is tuned (or tuned) using a tuning device before performance or practice, but tuning often occurs during performance or practice. It was difficult to retune during performance, and even if the tuning started to go a little crazy, there was no choice but to continue playing. For this reason, there is a problem that it is complicated to tune again after the performance.

  Some electric guitars include a tremolo arm equipped with a device that changes the pitch by moving a guitar bridge. In the case of such an electric guitar, tuning frequently occurs every time the tremolo arm is used, and there is a problem that the number of re-tuning after the performance is remarkably increased.

  It is an object of the present invention to realize a stable output of a musical sound with a stable pitch even when tuning is out of order by allowing the input musical sound signal to be output with a corrected pitch.

  To achieve the above object, the tuning device according to claim 1 includes an input unit that inputs a musical sound signal, a pitch detection unit that detects a pitch of the musical sound signal input from the input unit, and the pitch detection unit. According to the pitch monitoring unit that monitors the pitch detected by the control unit, the control unit that calculates the correction amount of the pitch detected by the pitch detection unit and the reference pitch, and the correction amount of the pitch calculated by the control unit A musical tone correction unit that corrects the pitch of the musical tone signal input from the input unit; and an output unit that outputs the musical tone signal corrected by the musical tone correction unit.

  The tuning device according to claim 2 is detected by a plurality of input units for inputting a musical sound signal, a plurality of pitch detection units for detecting a pitch of the musical sound signal inputted from the input unit, and the pitch detection unit. A plurality of pitch monitoring units that monitor the pitch, a control unit that calculates a correction amount of the pitch detected by the pitch detection unit and a reference pitch, and a correction amount of the pitch calculated by the control unit, A musical tone correction unit that corrects the pitch of a plurality of musical tone signals input from the input unit, a mixer unit that mixes a plurality of musical tone signals output from the musical tone correction unit, and a musical tone signal mixed by the mixer unit And an output unit for outputting.

  The tuning apparatus according to claim 3 is characterized in that the pitch monitoring unit has a function of determining whether a musical tone signal input from the input unit is being tuned or being played.

  The tuning apparatus according to claim 4 is characterized in that the pitch monitoring unit searches for a tuning method and monitors a fundamental frequency constituting the corresponding tuning method as a reference pitch.

  The tuning apparatus according to claim 5 is characterized in that the tuning apparatus includes a setting unit capable of setting various tunings.

  The tuning device according to claim 6 is characterized in that the setting unit can select a tuning method.

  The tuning device according to claim 7 is characterized in that the setting unit can change a reference pitch of the pitch monitoring unit.

  The tuning method according to claim 8 includes a step of initializing when the tuning device is activated, a step of extracting the pitch of the input musical instrument sound or musical sound signal, and a tuning result from the extracted pitch. The step of calculating, the step of searching for the tuning method from the extracted pitch, the corresponding tuning method is obtained from the search of the tuning method, and the pitch information for monitoring the pitch constituting the tuning method as the fundamental frequency is obtained. A step of calculating a variation between the extracted pitch and the pitch information for monitoring and receiving the sound of the musical instrument and the musical tone signal; and if the calculated pitch is varied, the musical tone is corrected. And a step of processing and an output step of making the result of the tuning into a visually recognizable output.

  The tuning method according to claim 9 is a step of performing initialization when the tuning device is activated, a step of obtaining tuning settings from a setting unit, and a pitch of an input musical instrument sound or musical tone signal. A step, a step of calculating a tuning result from the extracted pitch, a step of searching for a tuning method from the extracted pitch, a corresponding tuning method is obtained from the search of the tuning method, and the pitch constituting the tuning method is determined. Obtaining pitch information for monitoring as a fundamental frequency; receiving a sound or musical tone signal of the musical instrument; calculating a variation between the extracted pitch and the pitch information for monitoring; and the calculated pitch. If there is fluctuation, the step of processing the correction of musical tone and the result of the above tuning can be visually recognized Characterized by comprising an output step of a force, a.

  The recording medium according to claim 10 includes a pitch extraction process for extracting a pitch of an input musical instrument sound or a musical sound signal, a tuning result calculation process for calculating a tuning result from the extracted pitch, and an extracted pitch. When the corresponding tuning method is acquired from the tuning method search process for searching the tuning method and the search for the tuning method, and the pitch information for monitoring the pitch constituting the tuning method as a fundamental frequency is acquired, the sound of the instrument is acquired. A fluctuation calculation process for calculating a fluctuation between the extracted pitch and the pitch information for monitoring, and a musical tone correction process for correcting a musical tone when there is a fluctuation in the calculated pitch. , Tune result output process that makes the above tune result visually recognizable, and the tune process provided to the computer And it stores a program for causing.

  The storage medium according to claim 11 is a tuning setting acquisition process for acquiring a tuning setting from a setting unit, a pitch extraction process for extracting a pitch of an input musical instrument sound or a musical sound signal, and tuning of the extracted pitch. The tuning result calculation process for calculating the result, the tuning method search process for searching the tuning method from the extracted pitch, and the corresponding tuning method is obtained from the search of the tuning method, and the pitch constituting the tuning method is set as the basic frequency. When the pitch information for monitoring is acquired, a fluctuation calculation process for receiving the sound or musical tone signal of the musical instrument and calculating the fluctuation between the extracted pitch and the pitch information for monitoring, and fluctuations in the calculated pitch. In some cases, it is possible to visually recognize the musical tone correction processing for correcting musical tone and the result of the above tuning. It stores a program for executing a tuning results output process to force the tuning process with the to the computer.

  In the tuning device of the present invention, the input musical sound signal can be output with the pitch corrected. As a result, there is an effect that it is possible to output a musical sound with a stable pitch even when the tuning is out of order. In addition, it has a plurality of input units, has an effect of correcting a multi-channel pitch, outputting a plurality of musical tone signals, and correcting chords.

Hereinafter, preferred embodiments of the information display device of the present invention will be described in detail with reference to FIGS. 1 to 11.
(First embodiment)
FIG. 1 is a block diagram showing a configuration of a tuning device to which the present invention is applied, and an embodiment when applied to a stringed instrument will be described. The pitch detection unit 2, the pitch monitoring unit 3, and the control unit 4 are composed of a microcomputer or the like, and govern the overall operation of the tuning device. The microcomputer includes a read-only memory that stores a program for controlling the operation of the entire tuning device, a random access memory as a working area necessary for executing the program, a clock oscillator, and a time Consists of measurement timer functions.

  The tone correction unit 5 includes an A / D conversion unit 6 that performs analog / digital conversion on the tone signal input from the input unit 1, a tone calculation unit 7 that pitch-shifts the tone signal by the corrected pitch shift amount, and a pitch shift A D / A converter 8 is provided for digital / analog conversion of the musical sound signal. The musical tone calculation unit 7 is configured by a DSP (digital signal processor) or the like.

  The input unit 1 includes a microphone that converts the sound of the musical instrument into an electric signal, a low-frequency amplifier that amplifies the electric signal obtained through the jack, and the amplified tone signal is corrected with the pitch detection unit 2 and the tone correction. Output to unit 5.

  As shown in FIG. 5, the pitch detection unit 2 receives the electric signal S1 from the input unit 1, and performs an interrupt process of the microcomputer for each rising or falling of the rectangular wave of the waveform-shaped electric signal S2 (rectangular wave). Then, the time interval is measured to extract the electric signal S2, that is, the pitch (period) of the electric signal S1.

  A pitch data table (cent table) as shown in FIG. 6 is stored in a memory inside the microcomputer or an external memory (not shown). Here, the searchable range of the musical tone of FIG. 6 includes the pitch C of the octave 0 and the cent value 0, that is, the frequency of 16.35 Hz to the pitch B of the octave 8 and the cent value 0, that is, the frequency of 7902. It shows that a musical tone in the range of 13 Hz can be detected.

  The pitch detection unit 2 refers to the pitch data table of FIG. 6, and the reference pitch of the octave (complete pitch of 8 degrees) and the pitch name (names given to 12 different sounds included in the octave), The extracted pitch data is compared with each other, and a pitch name of chromatic (a complete 8 degree pitch, that is, a name obtained by dividing one octave into 12 semitones) is calculated. Further, reference pitch data corresponding to one cent of each chromatic semitone (cent is a pitch about one hundredth of a chromatic semitone) is searched from the obtained pitch name, and a reference of one cent of the corresponding semitone is searched. A cent value for a chromatic semitone is obtained based on the pitch and the extracted pitch signal. Detection pitch data including the calculated pitch name and cent value is output to the pitch monitoring unit 3 and the control unit 4.

  Here, FIG. 7 shows the tuning method of the stringed instrument and the tuning pattern of each string. The upper stage tuning is called standard or normal tuning, and the lower stage Open G, Open D, and drone G are irregular tunings. Call.

  The pitch monitoring unit 3 compares which tuning method pattern the pitch data of the input musical sound signal corresponds to with the tuning pattern of FIG. Monitor pitch data of the cent reference pitch is output to the control unit 4.

  The controller 4 generates a difference between the detected pitch data and the monitored pitch data based on the detected pitch data output from the pitch detector 2 and the monitored pitch data of tuning output from the pitch monitor 3. If so, the pitch correction data is output to the musical tone correction unit 5. The tuning information of the control unit 4 is displayed via the display unit 9.

  The display unit 9 can receive an output signal from the control unit 4 and display tuning results such as a pitch name, an octave, and a cent deviation by a member composed of a needle meter, a liquid crystal display element, an LED element, and the like.

  The tone correction unit 5 converts the tone signal input from the input unit 1 into a digital signal based on a predetermined sampling frequency by the A / D conversion unit 6 which is a component of the tone correction unit 5, and the tone calculation unit 7. To be supplied. Further, the musical tone calculation unit 7 which is a component of the musical tone correction unit 5 receives the pitch correction data from the control unit 4, corrects the input musical sound signal to a desired pitch shift, and outputs it to the D / A conversion unit 8. To do. The D / A conversion unit 8 converts the digital signal output from the musical sound calculation unit 7 into an analog musical signal, and the output unit 10 is connected to an amplifier that amplifies the acoustic signal to generate a musical sound. The

  In the tuning device configured as described above, even if a tone signal out of tuning is input from the input unit 1, a tone signal corrected to a correct reference pitch is output. Here, the output unit 10 may directly output the tone signal of the input unit 1 or may output only the tone signal corrected to the correct reference pitch, not the direct tone. Alternatively, the direct sound and the musical sound signal corrected to the reference pitch may be mixed and output.

  A series of operations of the tuning device having the above configuration will be described step by step with reference to the flowchart of FIG.

  FIG. 8 is a main routine of the tuning device of the present invention.

  Step S000 is a routine that is executed when the tuning device is activated, and initializes various buffers, registers, parameters, and the like, and includes a control unit 4, that is, a microcomputer that controls the entire tuning device is initialized. Is done. When step S000 ends, the process proceeds to step S001.

  In step S001, the waveform shaping output signal (electrical signal S2) shown in FIG. 5 is fetched, and the process proceeds to step S002.

  Step S002 is a routine for detecting the pitch, and the electric signal S2, that is, the pitch (cycle) of the electric signal S1, is extracted by counting the time interval for each rising or falling of the rectangular wave shown in the electric signal S2. The process proceeds to step S003.

  In step S003, the reference period data of the octave (full 8 degree pitch) and pitch names (names given to twelve different sounds included in the octave) stored in the memory and the extracted pitch are stored. The signal is compared, and the pitch name and octave of the chromatic (complete 8 degree pitch, that is, the name obtained by dividing one octave into 12 semitones) are calculated from the reference pitch data close to the extracted pitch. Proceed to S004.

  A step S004 compares whether the pitch name and the octave are within a searchable range. For example, in the range of the pitch name and octave shown in FIG. 6, that is, in the case of the pitch name C from octave 0 to octave 8, the process proceeds to step S005. If it is out of range, the main routine is returned after the processing is completed.

  Step S005 receives a signal of the searched chromatic semitone, and is a standard corresponding to one cent of each chromatic semitone stored in the memory (cent is a pitch about one hundredth of a chromatic semitone). The reference data of 1 cent of the corresponding semitone is read from the pitch data. Further, the cent value for the chromatic semitone is calculated based on the reference pitch data of 1 cent of the corresponding semitone and the extracted pitch signal, and the process proceeds to step S006.

  Step S006 is a pitch monitoring search routine which will be described later. The pitch monitoring unit 3 searches for the tuning method shown in FIG. 7, and the reference pitch data constituting the corresponding tuning method and the input musical sound signal are searched. Calculate pitch variation. The process proceeds to step S007 based on the pitch fluctuation result.

  In step S007, the control unit 4 compares the input musical sound signal with the pitch variation obtained from the pitch monitoring unit 3. If there is a variation, the process proceeds to step S008, and if there is no variation, the process proceeds to step S009.

  In step S008, the musical tone correction unit 5 performs a correction process to a value of “0 cent” if it is the reference pitch in the term of the pitch data table (cent table) of FIG. 6, and the process proceeds to step S009.

  In step S009, a signal of tuning information is output from the control unit 4 to the display unit 9 and displayed. After the processing is completed, the main routine is returned.

  FIG. 10 is a pitch monitoring / retrieval routine detailing step S006.

  Step S200 in FIG. 10 is a routine for fetching the pitch information of the input musical sound, acquires the pitch name and cent information, and proceeds to step S201.

  Step S201 is a buffer for storing pitch information. After the pitch information of the input musical sound is sequentially stored in the buffer, the process proceeds to step S202.

  In step S202, the pitch information stored in the buffer is confirmed, and the same pitch information is continued, and the tuning is completed by confirming whether or not the reference pitch is adjusted to the target pitch. If the tuning is completed, the process proceeds to step S203. If the pitch information is significantly unstable, the pitch monitoring / retrieval routine is exited to determine whether tuning is in progress or playing.

  In step S203, the type of the tuning method shown in FIG. 7 is searched based on the pitch information, and the process proceeds to step S204.

  In step S204, the pitch constituting the corresponding tuning method is recognized as the fundamental frequency, and the search routine for monitoring the pitch is exited. After the return, the process proceeds to the next step S007 of the main routine, where the input musical sound signal and the pitch variation obtained from the pitch monitoring unit 26 are compared by the control unit 27, and if there is a variation, a pitch correction process is performed. To act.

  Here, FIG. 11 is an example of a routine for searching for tuning information of each string in order from the 6th string to determine which type of tuning method in step S203 corresponds to, and independently searches each string from the 6th string to the 1st string. That is, a routine for recognizing a tuning method by parallel processing.

  Step S300 in FIG. 11 is a routine for taking in the pitch name of the musical tone that has been tuned in step S202, and the process proceeds to step S301.

  Step S301 is a buffer for storing the acquired pitch name information. Therefore, after the pitch name information for which tuning has been completed is sequentially stored in the buffer, the process proceeds to step S302.

  Step S302 is a routine for comparing the acquired pitch name information with the 6-string tuning information. For example, the information is compared with information such as the 6-string tuning table shown in FIG. Advances to step S303. If there is no corresponding tuning information, the process proceeds to step S304.

  In step S303, the corresponding 6-string tuning information is stored in the buffer, and the process proceeds to step S314.

  Step S304 is a routine for comparing the acquired pitch name information and the 5-string tuning information. For example, when there is matching 5-string tuning information compared with information such as the 5-string tuning table shown in FIG. Advances to step S305. If there is no corresponding tuning information, the process proceeds to step S306.

  In step S305, the corresponding 5-string tuning information is stored in the buffer, and the process proceeds to step S314.

  Step S306 is a routine for comparing the acquired pitch name information and the 4-string tuning information. For example, when there is the corresponding 4-string tuning information compared with information such as the 4-string tuning table shown in FIG. Advances to step S307. If there is no corresponding tuning information, the process proceeds to step S308.

  In step S307, the corresponding 4-string tuning information is stored in the buffer, and the process proceeds to step S314.

  Step S308 is a routine for comparing the acquired pitch name information with the tuning information of the three strings. For example, when there is the corresponding tuning information of the three strings by comparing with information such as the tuning table of the three strings shown in FIG. Advances to step S309. If there is no corresponding tuning information, the process proceeds to step S310.

  In step S309, the corresponding tuning information of the third string is stored in the buffer, and the process proceeds to step S314.

  Step S310 is a routine for comparing the acquired pitch name information with the tuning information of the two strings. For example, if there is tuning information for the corresponding two strings by comparing with information such as the tuning table of the two strings shown in FIG. Advances to step S311. If there is no corresponding tuning information, the process proceeds to step S312.

  In step S311, the tuning information of the corresponding two strings is stored in the buffer, and the process proceeds to step S314.

  Step S312 is a routine for comparing the acquired pitch name information with the tuning information of the first string. For example, when there is tuning information of the corresponding first string by comparing with information such as the tuning table of the first string shown in FIG. Advances to step S313. If there is no corresponding tuning information, the routine for searching the tuning method is exited.

  In step S313, the corresponding tuning information of the first string is stored in the buffer, and the process proceeds to step S314.

  In step S314, the 6-string tuning information stored in step S303, the 5-string tuning information stored in step S305, the 4-string tuning information stored in step S307, and the 3 string stored in step S309 are stored. Based on the tuning information of the strings, the tuning information of the two strings recorded in step S311 and the tuning information of the first string recorded in step S313, the type of tuning method shown in FIG. If there is a tuning method to be performed, the process proceeds to step S315. If there is no corresponding tuning information, the routine for searching the tuning method is exited.

In step S315, the corresponding tuning method is stored in the buffer, and this routine is exited.
(Second Embodiment)
FIG. 2 is a block diagram showing a configuration of a second embodiment of a tuning device to which the present invention is applied, and is an example characterized by including a setting unit capable of setting various tunings. This will be described below. The pitch detection unit 25, the pitch monitoring unit 26, and the control unit 27 are composed of a microcomputer or the like, and govern the overall operation of the tuning device. The microcomputer includes a read-only memory that stores a program for controlling the operation of the entire tuning device, a random access memory as a working area necessary for executing the program, a clock oscillator, and a time Consists of measurement timer functions.

  The setting unit 32 includes a circuit that generates a switch signal by opening and closing the switch member, and is characterized in that, for example, a tuning method shown in FIG. 7 can be selected.

  The setting unit 32 is characterized in that the reference pitch of the pitch monitoring unit 26 can be changed. Here, an action for selecting an instrument to be tuned, a string of a stringed instrument, or a chromatic note name from the outside may be added. A signal from the setting unit 32 is output to the control unit 27.

  The musical tone correction unit 28 includes an A / D conversion unit 29 that performs analog / digital conversion on the musical tone signal input from the input unit 24, a musical tone calculation unit 30 that pitch shifts the musical tone signal by the corrected pitch shift amount, and a pitch shift. A D / A converter 31 is provided for digital / analog conversion of the musical sound signal. The musical tone calculation unit 30 is configured by a DSP (digital signal processor) or the like.

  The input unit 24 includes a microphone that converts the sound of the musical instrument into an electric signal, a low-frequency amplifier that amplifies the electric signal obtained via the jack, and the amplified tone signal is corrected with the pitch detection unit 25 and the tone correction unit. To the unit 28.

  As shown in FIG. 5, the pitch detection unit 25 receives the electric signal S1 from the input unit 24, and performs interrupt processing of the microcomputer every time the rectangular wave rises or falls in the waveform-shaped electric signal S2 (rectangular wave). Then, the time interval is measured to extract the electric signal S2, that is, the pitch (period) of the electric signal S1.

  A pitch data table (cent table) as shown in FIG. 6 is stored in a memory inside the microcomputer or an external memory (not shown). Here, the searchable range of the musical tone of FIG. 6 includes the pitch C of the octave 0 and the cent value 0, that is, the frequency of 16.35 Hz to the pitch B of the octave 8 and the cent value 0, that is, the frequency of 7902. It shows that a musical tone in the range of 13 Hz can be detected.

  The pitch detection unit 25 refers to the pitch data table of FIG. 6, and the reference pitch of the octave (complete pitch of 8 degrees) and the pitch name (names given to 12 different sounds included in the octave), The extracted pitch data is compared with each other, and a pitch name of chromatic (a complete 8 degree pitch, that is, a name obtained by dividing one octave into 12 semitones) is calculated. Further, reference pitch data corresponding to one cent of each chromatic semitone (cent is a pitch about one hundredth of a chromatic semitone) is searched from the obtained pitch name, and a reference of one cent of the corresponding semitone is searched. A cent value for a chromatic semitone is obtained based on the pitch and the extracted pitch signal. Detection pitch data including the calculated pitch name and cent value is output to the pitch monitoring unit 26 and the control unit 27.

  The pitch monitoring unit 26 compares which tuning method pattern the pitch data of the input musical sound signal corresponds to with the tuning pattern of FIG. The monitoring pitch data of the cent reference pitch is output to the control unit 27.

  The controller 27 generates a difference between the detected pitch data and the monitored pitch data based on the detected pitch data output from the pitch detector 25 and the monitored pitch data of tuning output from the pitch monitor 26. If so, the pitch correction data is output to the musical tone correction unit 28. The tuning information of the control unit 27 is displayed via the display unit 33.

  The display unit 33 can receive an output signal from the control unit 27 and display tuning results such as a pitch name, octave, and cent deviation by a member composed of a needle meter, a liquid crystal display element, an LED element, and the like.

  The musical tone correction unit 28 converts the musical tone signal input from the input unit 24 into a digital signal based on a predetermined sampling frequency by an A / D conversion unit 29 that is a component of the musical tone correction unit 28, and a musical tone calculation unit 30. To be supplied. Further, the musical tone calculation unit 30 which is a component of the musical tone correction unit 28 receives the pitch correction data from the control unit 27, corrects the input musical sound signal to a desired pitch shift, and sends it to the D / A conversion unit 31. Output. The D / A conversion unit 31 converts the digital signal output from the musical tone calculation unit 30 into an analog musical tone signal, and the output unit 34 is connected to an amplifier that amplifies the acoustic signal to generate a musical tone. The

  In the tuning device configured as described above, even if a tone signal out of tuning is input from the input unit 24, a tone signal corrected to a correct reference pitch is output. Here, the output unit 34 may directly output the musical tone signal of the input unit 24, or may output only the musical tone signal corrected to the correct reference pitch, not the direct sound. Alternatively, the direct sound and the musical sound signal corrected to the reference pitch may be mixed and output.

  The tuning apparatus according to the second embodiment of the present invention having the above configuration will be described step by step with reference to the flowchart shown in FIG.

  FIG. 9 is a main routine showing a second embodiment of the present invention.

  Step S100 is a routine that is executed when the tuning device is started, and is a routine that initializes various buffers, registers, parameters, and the like, and includes a control unit 27, that is, a micro that controls the tuning device as a whole. The computer is initialized. When step S100 ends, the process proceeds to step S101.

  Step S101 is a routine for capturing a switch signal by opening and closing the switch member of the setting unit 32. Here, according to the specifications of the tuning device, the tuning mode desired by the tuner is set from the outside, and the routine for capturing the state, the string of the instrument to be tuned, the string of the stringed instrument, or the chromatic note name are selected from the outside. It does not matter as a routine for this. After the routine ends, the process proceeds to step S102.

  In step S102, the waveform shaping output signal (electrical signal S2) shown in FIG. 5 is fetched, and the process proceeds to step S103.

  Step S103 is a routine for detecting the pitch, and the electric signal S2, that is, the pitch (cycle) of the musical tone signal S1, is extracted by counting the time interval for each rising or falling of the rectangular wave shown in the electric signal S2. The process proceeds to step S104.

  In step S104, the reference period data of the octave (full 8 degree pitch) and pitch names (names given to twelve different sounds included in the octave) stored in the memory and the extracted pitch are stored. The signal is compared, and the pitch name and octave of the chromatic (complete 8 degree pitch, that is, the name obtained by dividing one octave into 12 semitones) are calculated from the reference pitch data close to the extracted pitch. The process proceeds to S105.

  Step S105 receives a chromatic semitone signal that has been searched, and is a standard corresponding to one cent of each chromatic semitone stored in the memory (cent is a pitch that is about 1 / 100th of a chromatic semitone). The reference data of 1 cent of the corresponding semitone is read from the data. Further, a cent value for a chromatic semitone is calculated on the basis of the reference data of 1 cent of the corresponding semitone and the extracted pitch signal, and the process proceeds to step S106.

  Step S106 is a pitch monitoring search routine similar to that of the first embodiment. The pitch monitoring unit 26 searches for the tuning method shown in FIG. 7, and the reference pitch data constituting the corresponding tuning method; The pitch variation with the input musical sound signal is calculated. The process proceeds to step S107 based on the pitch fluctuation result.

  In step S107, the input musical tone signal and the pitch fluctuation obtained from the pitch monitoring unit 26 are compared by the control unit 27. If there is a fluctuation, the process proceeds to step S108, and if there is no fluctuation, the process proceeds to step S109.

  In step S108, the musical tone correcting unit 28 corrects the value to "0 cent" if it is the reference pitch in the term of the pitch data table in FIG. 6, and then proceeds to step S109.

In step S109, a tuning information signal is output from the control unit 27 to the display unit 32 for display. After the processing is completed, the main routine is returned.
(Third embodiment)
FIG. 4 is a block diagram showing the configuration of the third embodiment of the tuning device to which the present invention is applied. A plurality of input units 12, a plurality of pitch detection units 13, a plurality of pitch monitoring units 14, a control unit 15, a plurality of musical tone correction units 16, a plurality of A / D conversion units 17, and a musical tone calculation unit 18 And a plurality of D / A converters 19, a setting unit 20, a display unit 21, a mixer unit 22, and an output unit 23. The plurality of input units 12 include, for example, a pickup input unit 1, an input unit 2, an input unit n−1, and an input unit n provided for each string on six strings such as a guitar. These pickups can pick up only the vibration of each string, and can pick up without being affected by the vibration of other strings.

  The setting unit 20 includes a circuit that generates a switch signal by opening and closing the switch member, and performs an operation for selecting an instrument to be tuned, a string of a stringed instrument, or a chromatic pitch name from the outside. A signal from the setting unit 20 is output to the control unit 15.

  The musical sounds detected from the pickups of the plurality of input units 12 are output to the plurality of pitch detection units 13 and the plurality of A / D conversion units 17, respectively. The plurality of pitch detection units 13 receive the pitch of each musical tone as an independent electrical signal from the plurality of input units 12, and each time the rectangular wave rises or falls, the waveform-shaped electrical signal (rectangular wave) In the interruption process, the time interval is measured to extract the pitch (cycle) of the electric signal, that is, the musical sound signal.

  The plurality of pitch detectors 13 individually refer to the pitch data table of FIG. 6 for each pitch signal extracted from each input musical sound, and the octave (complete pitch of 8 degrees) and the pitch name (in the octave). The reference pitch of the 12 different sounds included) was compared with the extracted pitch data, and the chromatic (full 8 degree pitch, ie, one octave was divided into 12 semitones) Name) is calculated individually. Further, reference pitch data corresponding to one cent of each semichromatic semitone (cent is a pitch about one hundredth of a chromatic semitone) is searched from the obtained pitch names, and 1 of the corresponding semitone is searched. Based on the cent reference data and the extracted individual pitch signals, the cent value of each musical tone with respect to the chromatic semitone is obtained. The detected pitch data including the pitch name and cent value calculated individually is output to the plurality of pitch monitoring units 14 and the control unit 15 individually.

  The plurality of pitch monitoring units 14 store the pitch data of the input musical sound signal, and can process the tuning pattern as shown in FIG. 7 independently from the 6th string to the 1st string, that is, in parallel. The corresponding tuning method can be recognized by referring to it. Information about the pitch name of the corresponding tuning and the reference pitch of the cent is output to the control unit 15.

  The control unit 15 detects the detected pitch data and the monitored pitch data based on the individual detected pitch data output from the plurality of pitch detection units 13 and the reference pitch data for tuning output from the plurality of pitch monitoring units 14. If there is a difference between the two, the individual pitch correction data is output to the plurality of musical tone correction units 16. The tuning information of the control unit 15 is displayed via the display unit 21.

  The display unit 21 can receive an output signal from the control unit 15 and display tuning results such as a pitch name, octave, and cent deviation by a member constituted by a needle meter, a liquid crystal display element, an LED element, and the like. Moreover, it does not matter as a structure which displays for every chord.

  The plurality of musical tone correction units 16 performs correction processing to a value of “0 cent” if the pitch is the reference pitch of the pitch data (cent table) term in FIG. 6, and the musical tone signals individually input by the plurality of input units 12 are A plurality of A / D converters 17 convert the signals into digital signals based on a predetermined sampling frequency and supply the digital signals to the musical tone calculator 18. Further, the musical tone calculation unit 18 which is a constituent element of the plurality of musical tone correction units 16 receives individual pitch correction data from the control unit 15 and, if the reference pitch in the term of pitch data (cent table) in FIG. Correction processing is performed on the value of “0 cent” and the result is output to a plurality of D / A converters 19. The plurality of D / A converters 19 are converted into individual analog tone signals based on the digital signals output from the tone calculation unit 18 and output to the mixer unit 22. The mixer unit 22 can make chords by mixing individual musical tone signals. The mixer unit 22 is connected to the output unit 23, and can output a musical sound to the outside through the output unit 23 via an amplifier.

  In the tuning device configured as described above, it is possible to extract the pitch of a chord composed of musical tones detected from the respective pickups of the plurality of input units 12 and to correct the pitch of the chord. Even if a single tone signal out of tuning is input to each single tone of chords output from the plurality of input units 12, a tone signal corrected to the correct reference pitch for each tone is output. Here, the output unit 23 may directly output the musical sound signals of the plurality of input units 12 or output only the chord corrected to the correct reference pitch, not the direct sound. Alternatively, the direct sound and the chord corrected to the reference pitch may be mixed and output.

  As described above, in the tuning device and tuning method of the present invention, the input tone signal can be output with the pitch corrected. As a result, there is an effect that it is possible to output a musical sound with a stable pitch even when the tuning is out of order.

  In addition, there is an effect that a plurality of input units are provided so that a multi-channel pitch can be corrected to output a plurality of musical tone signals, and a chord can be corrected.

  Moreover, you may implement by the personal computer which installed the program etc. which perform the control demonstrated in the said embodiment, the handheld computer, etc. As a method for distributing data such as the program, it may be stored in advance in a nonvolatile memory such as a ROM, or may be distributed through a communication line.

It is a block diagram which shows the structure of the tuning apparatus to which this invention is applied. It is a 2nd block diagram which shows the structure of the tuning apparatus to which this invention is applied. It is a block diagram which shows the structure of the conventional tuning apparatus. It is a 3rd block diagram which shows the structure of the tuning apparatus to which this invention is applied. It is a figure which shows the waveform shaping of the input musical sound. It is a pitch data table which shows an octave, a pitch name, and pitch data. It is a tuning method table which shows the pattern of a tuning method. It is a flowchart which shows the flow of a process of a main routine. It is a 2nd example of the flowchart which shows the flow of a process of a main routine. It is a flowchart which shows the flow of a process of a pitch monitoring search routine. It is a flowchart which shows the flow of a process of a tuning method search routine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input part 2 Pitch detection part 3 Pitch monitoring part 4 Control part 5 Music sound correction part 6 A / D conversion part 7 Musical sound calculation part 8 D / A conversion part 9 Display part 10 Output part 12 Multiple input parts 13 Multiple pitch detection Unit 14 Plural pitch monitoring unit 15 Control unit 16 Plural tone correction unit 17 Plural A / D conversion unit 18 Musical sound calculation unit 19 Plural D / A conversion unit 20 Setting unit 21 Display unit 22 Mixer unit 23 Output unit 24 Input Unit 25 Pitch detection unit 26 Pitch monitoring unit 27 Control unit 28 Musical sound correction unit 29 A / D conversion unit 30 Musical sound calculation unit 31 D / A conversion unit 32 Setting unit 33 Display unit 34 Output unit 35 Input unit 36 Pitch detection unit 37 Control Part 38 display part 39 setting part 40 output part

Claims (11)

An input section for inputting musical sound signals;
A pitch detector for detecting the pitch of the musical sound signal input from the input unit;
A pitch monitoring unit for monitoring the pitch detected by the pitch detection unit;
A control unit for calculating a correction amount between the pitch detected by the pitch detection unit and a reference pitch;
A musical tone correction unit that corrects the pitch of the musical tone signal input from the input unit according to the correction amount of the pitch calculated by the control unit;
An output unit for outputting a musical sound signal corrected by the musical sound correcting unit;
A tuning device comprising: A plurality of input sections for inputting musical sound signals;
A plurality of pitch detectors for detecting the pitch of the musical sound signal input from the input unit;
A plurality of pitch monitoring units for monitoring the pitch detected by the pitch detection unit;
A control unit for calculating a correction amount between the pitch detected by the pitch detection unit and a reference pitch;
A musical tone correction unit that corrects the pitch of a plurality of musical tone signals input from the input unit according to the pitch correction amount calculated by the control unit;
A mixer unit for mixing a plurality of tone signals output from the tone correction unit;
An output unit for outputting a musical sound signal mixed by the mixer unit;
A tuning device comprising:   The tuning apparatus according to claim 1, wherein the pitch monitoring unit has a function of determining whether a musical tone signal input from the input unit is being tuned or being played.   The tuning apparatus according to claim 1, wherein the pitch monitoring unit searches for a tuning method and monitors a fundamental frequency constituting the corresponding tuning method.   The tuning apparatus according to claim 1, wherein the tuning apparatus includes a setting unit capable of setting various tunings.   The tuning apparatus according to claim 5, wherein the setting unit can select a tuning method.   The tuning device according to claim 5, wherein the setting unit can change a reference pitch of the pitch monitoring unit. Initializing when the tuning device is activated; and
Extracting the pitch of the input instrumental sound or musical sound signal;
Calculating a tuning result from the extracted pitch;
Searching for a tuning method from the extracted pitch;
Acquiring a corresponding tuning method from the search of the tuning method, and acquiring pitch information for monitoring the pitch constituting the tuning method as a fundamental frequency;
Receiving the sound of the musical instrument and the musical sound signal, and calculating fluctuations of the extracted pitch and the pitch information for monitoring;
If there is a variation in the calculated pitch, the step of processing correction of the musical sound;
An output step for making the result of the above tuning a visually recognizable output;
The tuning method characterized by including. Initializing when the tuning device is activated; and
Obtaining tuning settings from the setting section;
Extracting the pitch of the input instrumental sound or musical sound signal;
Calculating a tuning result from the extracted pitch;
Searching for a tuning method from the extracted pitch;
Acquiring a corresponding tuning method from the search of the tuning method, and acquiring pitch information for monitoring the pitch constituting the tuning method as a fundamental frequency;
Receiving the sound of the musical instrument and the musical sound signal, and calculating fluctuations of the extracted pitch and the pitch information for monitoring;
If there is a variation in the calculated pitch, the step of processing correction of the musical sound;
An output step for making the result of the above tuning a visually recognizable output;
The tuning method characterized by including. Pitch extraction processing to extract the pitch of the input instrument sound and musical tone signal;
A tuning result calculation process for calculating a tuning result from the extracted pitch;
Tuning method search processing for searching a tuning method from the extracted pitch,
When the corresponding tuning method is obtained from the search of the tuning method, and the pitch information for monitoring the pitch constituting the tuning method as a fundamental frequency is obtained,
A variation calculation process for calculating a variation between the extracted pitch and the pitch information for monitoring, which receives the sound of the musical instrument or the musical sound signal;
When there is a variation in the calculated pitch, a musical tone correction process for processing musical tone correction,
Tuning result output processing for making the result of the above tuning a visually recognizable output;
The recording medium which memorize | stored the program for making a computer perform the tuning process provided with. Tuning setting acquisition processing for acquiring tuning settings from the setting unit;
Pitch extraction processing to extract the pitch of the input instrument sound and musical tone signal;
A tuning result calculation process for calculating a tuning result from the extracted pitch;
Tuning method search processing for searching a tuning method from the extracted pitch,
When the corresponding tuning method is obtained from the search of the tuning method, and the pitch information for monitoring the pitch constituting the tuning method as a fundamental frequency is obtained,
A variation calculation process for calculating a variation between the extracted pitch and the pitch information for monitoring, which receives the sound of the musical instrument or the musical sound signal;
When there is a variation in the calculated pitch, a musical tone correction process for processing musical tone correction,
Tuning result output processing for making the result of the above tuning a visually recognizable output;
The recording medium which memorize | stored the program for making a computer perform the tuning process provided with.

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