JP2016180822A - String press position detection device, string press detect method, program and electronic musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect a string press position when playing an electronic string instrument or a press position when playing an electronic musical instrument.SOLUTION: For example, in six coils 301 on each sensor board 201, only two coils 301 which are separated from each other being interposed by two coil 301 are driven simultaneously during one phase, and the other coils 301 are stopped from resonating. Also, in two neighboring sensor boards 201, only two coils 301, which are separated from each other being interposed by two coil 301 in a longitudinal direction of a neck part 102, are driven. When the respective coils 301 are driven to resonate in a time-division mode while switching three phases of 0, 1 and 2 at a high speed, string press positions on the respective strings are detected while suppressing interference among the coils 301 due to electromagnetic induction.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a pressed string position detection device, a pressed string detection method and program, and an electronic musical instrument.

2. Description of the Related Art Conventionally, in an electronic stringed instrument such as an electronic guitar, a plurality of strings are stretched on a fingerboard provided with a plurality of frets, similarly to a non-electronic stringed instrument. For this reason, the performer can perform the same performance as a stringed musical instrument, for example, playing a string with the right hand while pressing the string with a predetermined fret with the left hand.
In this case, the electronic string instrument does not sound by the vibration of the string itself, but sounds by generating an electronic sound with an electronic circuit called a sound source. For this reason, in order to realize the pronunciation of an electronic stringed musical instrument, pitch information is required. In stringed instruments, the pitch is determined based on the position of the fret where the string is pressed with a finger (hereinafter referred to as the pressed position). Therefore, in electronic stringed instruments, it is preferable that pitch information is generated based on the pressed position. For this reason, conventionally, a technique for detecting a pressed position in an electronic stringed instrument has been researched and developed (see, for example, Patent Document 1).

JP 59-176783 A

  However, in the prior art including Patent Document 1, it is necessary to apply a current to the string, and a configuration for that is required. As a result, the structure is complicated and the cost is high. For this reason, the realization of a new technique for detecting the pressed string position has been demanded.

  Accordingly, an object of the present invention is to accurately detect a string pressing position during performance of an electronic stringed instrument or a pressing position during performance of an electronic musical instrument.

  In an example of the aspect, the resonance frequency changes according to a change in distance between the fingerboard in which a plurality of string-pressing positions are defined and each of the string-pressing positions in association with each other. A plurality of resonance circuits are provided corresponding to each of the plurality of resonance circuits, and a plurality of sensors for detecting a change in resonance frequency of each corresponding resonance circuit and a plurality of resonance circuits to be driven are not adjacent to each other. A driving unit that drives the resonance circuit belonging to each of the fingerboards in a time-sharing manner, and a string-pressing position detection unit that detects a string-pressing position based on a change in resonance frequency detected by each of the plurality of sensors.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to detect accurately the stringing position at the time of performance in an electronic stringed instrument, or the pressing position at the time of performance in an electronic musical instrument.

It is a front view which shows the external appearance of an electronic stringed instrument. It is a perspective view which shows an example of a neck part and the mechanism of the inside. It is a figure which shows an example (whole) of a sensor board | substrate. It is a figure which shows an example (1 fret) of a sensor board | substrate. It is a figure which shows the wiring relationship of a sensor board | substrate and a control circuit. It is a figure explaining the problem which generate | occur | produces by the electromagnetic induction between adjacent coils. It is explanatory drawing of the time division drive operation | movement of the coil by this embodiment. It is a figure which shows the hardware structural example of a control circuit. It is a flowchart which shows the example of the whole control processing which a control circuit performs. It is a flowchart which shows the detailed example of a performance detection process. It is a flowchart which shows the detailed example of a pressed string position detection process. It is a flowchart which shows the detailed example of a preceding trigger process. It is a flowchart which shows the detailed example of a string vibration process. It is a flowchart which shows the detailed example of an integration process. It is a figure which shows the specific design example of a capacitor and a coil in the resonance circuit arrange | positioned on a sensor board | substrate. It is explanatory drawing of the control operation | movement of the pressed string position detection process which took in the concept of the frequency division in addition to the time division processing by phase division. It is explanatory drawing of embodiment of an electronic wind instrument.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings. This embodiment uses a metal detection technique for detecting metal approaching a resonating coil, and uses a coil embedded in the neck of the electronic string instrument and an inductive proximity sensor to detect the string of the electronic string instrument. It is an electronic stringed instrument that detects the position without contact.

  FIG. 1 is a front view showing an external appearance of the electronic stringed instrument 100, and FIG. 2 is a perspective view showing an example of a neck portion and an internal mechanism thereof. As shown in FIG. 1, the electronic stringed musical instrument 1 includes a trunk portion 101, a neck portion 102, and a head portion 103. Six pegs (thread windings) 110 around which one end of each of the six metal strings 111 is wound are attached to the head portion 103. Each string 111 wound around each peg 110 passes from the neck portion 102 over the trunk portion 101 and is attached to the trunk portion 101 while being supported by a nut (upper piece) 109 (see FIG. 2) of the head portion 103. The bridge portion 104 is stretched between the six support portions. Each of the six strings 111 is associated with a string number. The thinnest string 111 on the upper side of FIG. 1 is the “first string”, and the second string, the third string, the fourth string, and the fifth string in the order of increasing the thickness of the string 111. The string number increases, such as “6th string”.

  The neck portion 102 has a plurality of frets of # 0 to # N-1 (the number of N is “22”, for example) from a head portion 103 toward a trunk portion 101 on a fingerboard 108 attached to the surface thereof. As shown in FIG. 2, 107 is embedded so as to go straight to each string 111. Each of the N frets 107 is associated with a fret number. The fret 107 closest to the nut 109 of the head portion 103 is the first fret (or # 0 fret), and the second fret (# 1 fret), the third fret (# 2 fret),. The fret 107 closest to the body 101 is the Nth fret (# N-1 fret).

  As illustrated in FIG. 2, the neck portion 102 includes the nut 109 and the # 0 fret 107, the # 0 and # 1 fret 107,..., # N−2 and # N−1. The sensor boards 201 of # 0, # 1,... # N−1 are respectively installed below the fingerboard 108 between the fret 107. In addition, a wiring board 202 that is connected to each sensor board 201 and transmits information of each sensor board 201 to the control circuit 106 (see FIG. 1) installed in the body 101 is provided in the longitudinal direction in the neck 102. Installed.

3 and 4 are diagrams illustrating an example of the sensor substrate 201. FIG. As shown in FIG. 3, six coils 301 for detecting the vibration of each string 111 are printed on each sensor board 201 of # 0, # 1,..., # N−1. . Further, as shown in FIG. 4, for example, in the sensor substrate 201 (#n) of any #n (0 ≦ n ≦ N−1), it corresponds to each string 111 from the first string to the sixth string. Between the wirings at both ends of each of the coils 301 (# n / # 1) to 301 (# n / # 6) # 1 to # 6 arranged in the same manner, the coils 301 for operating as a resonator. Capacitors 401 (# n / # 1) to 401 (# n / # 6) are connected. Each pair of terminals of each of the coils 301 (# n / # 1) to 301 (# n / # 6) is connected to the wiring board 202 (see FIG. 2) via the connector 402 (#n). It is connected to the control circuit 106 in the body 101 via a wiring on 202.
The sensor board 201 corresponding to the center position of the coil has a hole. The coil passes through the hole, passes through the back side of the sensor board 201, and is connected to the wiring board 202 (FIG. 5) via the connector 402 (#n). 2).

  FIG. 5 is a diagram illustrating a wiring relationship between the sensor substrate 201 and the control circuit 106. From each coil 301 (# n / # i) and each capacitor 401 (# n / # i) (1 ≦ i ≦ 6) on each sensor substrate 201 (#n) (0 ≦ n ≦ N−1). Each resonance circuit 501 (# n / # i) is resonated by each signal supplied from a voltage source in each sensor 502 (# n / # i) in the control circuit 106. The sensor 502 (# n / # i) includes a voltage source, a negative resistance, and a counter that counts an output signal (frequency). When the metal string 111 (#i) approaches the coil (# n / # i), the frequency changes and the count value changes. As a result, each resonance circuit 501 (# n / # i) resonates at a resonance frequency determined by the inductance value of each coil 301 (# n / # i) and the capacitance value of each capacitor 401 (# n / # i). Be made. Now, in a state where a certain resonance circuit 501 (# n / # i) is resonated by a voltage source in the sensor 502 (# n / # i) corresponding to the resonance circuit 501 (# n / # i), the player performs the resonance circuit 501 ( The metal string 111 (#i) corresponding to # n / # i) is placed in front of the #n fret of the neck portion 102 (between # n-1 and #n frets, if n = 0, FIG. 1 or FIG. 2 (between the nut 109 and the # 0 fret) on the fingerboard 108, the metal string 111 (#i) is turned into the coil 301 (# n / # n) in the resonance circuit 501 (# n / # i). When approaching #i) (when the distance between the string 111 (#i) and the coil 301 (# n / # i) changes), the coil 301 (# n / # i) and the capacitor 401 (# n / # i) ) And reactance determined by. As a result, the voltage across the coil 301 (# n / # i) changes. Therefore, the counter that counts the output signal (frequency) in the sensor 502 (# n / # i) counts the frequency, and the voltage change is detected from the change in the count value, whereby the string 111 (#i) # It is possible to detect that the string is pressed before the n fret.

  Each signal supply circuit 501 (# n / # i) (0 ≦ n ≦ N−1, 1 ≦ i ≦ 6) is collectively arranged in the control circuit 106 in the body 101 as described above. Alternatively, in order to prevent deterioration of the analog signal in the resonance circuit 501 (# n / # i), it may be arranged on the wiring board 202 in the vicinity of the sensor board 201 (#n).

  Here, in the electronic stringed instrument 100 (FIG. 1), it is possible to continuously detect the stringed state (change in distance) of the metal string 111 under the fingerboard 108 in front of all the frets 107 of # 0 to # N-1. Required. However, for that purpose, all the resonance circuits 501 (# n / # i) (0 ≦ n ≦ N−1, 1 ≦ i ≦ 6) need to be in a resonance state. However, as illustrated in FIG. 6, when adjacent coils 301 (# n / # 1), 301 (# n / # 2), 301 (# n / # 3) and the like resonate at the same time, for example, the coil 301 ( Magnetic fields A and A ′ generated by # n / # 2) enter separate coils 301 (# n / # 1) and 301 (# n / # 3), respectively, to cause electromagnetic induction. The reverse is also possible. As a result, the coils 301 (# n / # 1), 301 (# n / # 2), and 301 (# n / # 3) interfere with each other, and the resonance circuits 501 (# n / # 1) and 501 Noise is generated at (# n / # 2) and 501 (# n / # 3), and the string-pressed positions of the strings 111 (# 1), 111 (# 2), and 111 (# 3) are affected by the noise. The detection accuracy of the sensor deteriorates, and in some cases, detection becomes impossible.

  In order to avoid this, in this embodiment, the coils 301 close to each other are not driven at the same time, but are driven in a time division manner. FIG. 7 is an explanatory diagram of the time-division driving operation of the coil 301 according to the present embodiment. As shown in FIG. 7, for example, among the six coils 301 on each sensor board 201, only the coils 301 that are separated from each other by two coils 301 are simultaneously driven during one phase, and the others. The coil 301 is stopped from resonance. In the adjacent sensor substrate 201, only the coil 301 that is separated from the two coils 301 in the longitudinal direction of the neck portion 102 is driven. Then, each of the coils 301 is caused to resonate in a time-sharing manner while the three phases of phase 0, phase 1 and phase 2 shown in FIG. 7 are switched at high speed, thereby suppressing interference due to electromagnetic induction between the coils 301. Then, the detection of the position where each string 111 is pressed is performed.

  Returning to the description of FIG. 1, the body 101 is provided with a bridge 104 to which the other ends of the six strings 111 are attached, and a hex pickup 105 that independently detects vibrations of the strings 111.

  FIG. 8 is a diagram illustrating a hardware configuration example of the control circuit 106 in the trunk unit 101 illustrated in FIG. 1. The hardware configuration of the control circuit 106 illustrated in FIG. 8 includes a CPU (Central Processing Unit) 801, a ROM (Read Only Memory) 802, a RAM (Random Access Memory) 803, a switch unit 804, an interface unit 805, and a sound source. Unit 806, which are connected to each other by a system bus 809. The output of the sound source unit 806 is input to the sound system 807.

  The CPU 801 executes the control program stored in the ROM 802 while using the RAM 803 as a work memory, thereby executing the control operation of the electronic stringed instrument 100 of FIG.

  The switch unit 804 is provided with a tone color switch or a mode switch, which will be described later, and inputs the state of these switches and notifies the CPU 801 of them.

  The interface unit 805 is connected to the wiring board 202 of FIG. 2, and corresponds to the function of the sensor 502 (# n / # i) (0 ≦ n ≦ N−1, 1 ≦ i ≦ 6) shown in FIG. Wear (signal resonator and voltage detector).

  The sound source unit 806 generates digital musical tone data based on the sound generation control data input from the CPU 801 and outputs it to the sound system 807. The sound system 807 converts the digital musical tone data input from the sound source unit 806 into an analog musical tone signal, and then amplifies the analog musical tone signal with a built-in or external amplifier and emits the sound from a built-in speaker.

  FIG. 9 is a flowchart illustrating an example of overall control processing executed by the control circuit 106. First, the CPU 801 executes initialization by turning on the power. Thereafter, the CPU 801 repeatedly executes a series of processes from steps S902 to S905 until the power is turned off.

  In the repetitive processing, first, the CPU 801 executes switch processing (step S902). When one of the tone color switches (not shown) of the switch unit 804 is turned on by the performer, the CPU 801 stores a tone color number corresponding to the tone color designated by the tone color switch in a variable TONE in the RAM 803. Then, the CPU 801 supplies an event based on the variable TONE to the sound source unit 806. As a result, a tone color to be generated is designated in the sound source unit 806. Further, the CPU 801 sets various operation modes when any mode switch (not shown) of the switch unit 804 is turned on by the performer.

  Next, the CPU 801 executes performance detection processing (step S903). Here, the CPU 801 detects which string 111 at which fret position is pressed, and which string 111 is played by the hexa pickup 105 (see FIG. 1).

  Subsequently, the CPU 801 executes a sound generation process (step S904). Here, the CPU 801 supplies sound generation control data to the sound source unit 806 based on the result of the performance detection process in step S903. As a result, the tone generator 806 generates digital musical tone data, and the sound system 807 converts the digital musical tone data into an analog musical tone signal, thereby executing a musical tone.

  Finally, the CPU 801 executes other processing (step S905). Here, the CPU 801 executes various processes necessary for controlling the electronic stringed instrument 100 that were not executed in steps S902, S903, and S904. Thereafter, the CPU 801 returns to the process of step S902.

  FIG. 10 is a flowchart showing a detailed example of the performance detection process in step S903 of FIG.

  First, the CPU 801 executes a string pressing position detection process (step S1001) for detecting which string 111 of which fret position the player has started pressing.

  Next, the CPU 801 executes a string vibration process (step S1002) for detecting which string 111 is struck by the hex pickup 105 (see FIG. 1).

  Finally, the CPU 801 executes an integration process (step S1003) for integrating the string position and string vibration state newly detected in steps S1001 and S1002 with the current string position and string vibration state.

  FIG. 11 is a flowchart showing a detailed example of the string-pressing position detection process in step S1001 of FIG.

  In the string-pressing position detection process, the CPU 801 sets an initial value 0 to the variable phase on the RAM 803 indicating the current phase in step S1101, and then increments the value of the variable phase by +1 in step S1117, while the variable phase in step S1118. The following series of processing from steps S1102 to S1116 is repeatedly executed for each of the three phases indicated by the value of the variable phase = 0, 1, 2 until it is determined that the value of 2 exceeds 2. This iterative process corresponds to the time division process of phases 0, 1, and 2 described above with reference to FIG.

  In a series of processing from step S1102 to S1116, the CPU 801 sets an initial value 0 (the sensor board 201 (# 0) in FIGS. 2 and 7) to the variable n on the RAM 803 indicating the current position of the sensor board 201 in step S1102. In step S1114, the value of the variable n is incremented by +1, and the value of the variable n is indicated by the value of the variable n until it is determined in step S1115 that the value of the variable n has reached the value “N”. For each position of the sensor substrate 201 (corresponding to each position of the sensor substrate 201 (# 0), 201 (# 1),..., 201 (# N-1) in FIGS. 2 and 7). Then, the following series of processing from steps S1103 to S1113 is repeatedly executed. In FIG. 7, this iterative process is performed for each phase of the resonance circuit 501 (# n / # 1 to # n / # 6) that is driven for the sensor substrate 201 (# 0 to # N−1). ) (See FIG. 5).

  In a series of processing from step S1103 to S1113, first, the CPU 801 determines whether or not the value of the variable phase is “0” (step S1103).

  When the value of the variable phase is “0” (the determination in step S1103 is YES), the CPU 801 determines whether the remainder “n% 3” when the value of the variable n is divided by “3” is “1”. Is determined (step S1104). “%” Indicates an operator for calculating the remainder.

  When the remainder “n% 3” obtained by dividing the value of the variable n by “3” is “1” (the determination in step S1104 is YES), the CPU 801 indicates the sensor substrate 201 (#n) indicated by the value of the variable n. ) The second and fifth string resonance circuits 501 (# n / # 2) and 501 (# n / # 5) are driven (step S1111). This is an example of the resonance circuit 501 that resonates on the sensor substrate 201 (# 1) at the time division timing of phase = 0 in FIG.

  If the remainder “n% 3” obtained by dividing the value of the variable n by “3” is not “1” (the determination in step S1104 is NO), the CPU 801 divides the value of the variable n by “3”. It is determined whether or not the remainder “n% 3” is “2” (step S1105).

  If the remainder “n% 3” obtained by dividing the value of the variable n by “3” is “2” (YES in step S1105), the CPU 801 indicates the sensor substrate 201 (#n) indicated by the value of the variable n. ) The 3rd and 6th string resonance circuits 501 (# n / # 3) and 501 (# n / # 6) are driven (step S1112). This is an example of the resonance circuit 501 that resonates on the sensor substrate 201 (# 2) at the time division timing of phase = 0 in FIG.

  When the value of the variable n is divided by “3”, the remainder “n% 3” is not “2” (the determination in step S1105 is NO), that is, the value of the variable n is divided by “3”. When the remainder “n% 3” is “0”, the CPU 801 causes the resonance circuit 501 (# n / # 1) of the first and fourth strings on the sensor board 201 (#n) indicated by the value of the variable n. And 501 (# n / # 4) are driven (step S1113). This is an example of the resonance circuit 501 that resonates on the sensor substrate 201 (# 0) or 201 (# 3) at the time division timing of phase = 0 in FIG.

  If the value of the variable phase is not “0” (NO in step S1103), the CPU 801 determines whether the value of the variable phase is “1” (step S1106).

  When the value of the variable phase is “1” (determination in step S1106 is YES), the CPU 801 determines whether the remainder “n% 3” when the value of the variable n is divided by “3” is “1”. Is determined (step S1107).

  When the remainder “n% 3” obtained by dividing the value of the variable n by “3” is “1” (the determination in step S1107 is YES), the CPU 801 indicates the sensor substrate 201 (#n) indicated by the value of the variable n. ) The 3rd and 6th string resonance circuits 501 (# n / # 3) and 501 (# n / # 6) are driven (step S1112). This is an example of the resonance circuit 501 that resonates on the sensor substrate 201 (# 1) at the time division timing of phase = 1 in FIG. 7, for example.

  If the remainder “n% 3” obtained by dividing the value of the variable n by “3” is not “1” (the determination in step S1107 is NO), the CPU 801 divides the value of the variable n by “3”. It is determined whether or not the remainder “n% 3” is “2” (step S1108).

  When the remainder “n% 3” obtained by dividing the value of the variable n by “3” is “2” (YES in step S1108), the CPU 801 indicates the sensor substrate 201 (#n) indicated by the value of the variable n. ) The first and fourth string resonance circuits 501 (# n / # 1) and 501 (# n / # 4) are driven (step S1113). This is an example of the resonance circuit 501 that resonates on the sensor substrate 201 (# 2) at the time division timing of phase = 1 in FIG.

  When the value of the variable n is divided by “3”, the remainder “n% 3” is not “2” (the determination in step S1108 is NO), that is, the value of the variable n is divided by “3”. When the remainder “n% 3” is “0”, the CPU 801 causes the resonance circuit 501 (# n / # 2) of the second and fifth strings on the sensor substrate 201 (#n) indicated by the value of the variable n. And 501 (# n / # 5) are driven (step S1111). This is an example of the resonance circuit 501 that resonates on the sensor substrate 201 (# 0) or 201 (# 3) at the time division timing of phase = 1 in FIG.

  When the value of the variable phase is not “1” (the determination in step S1106 is NO), that is, when the value of the variable phase is “2”, the CPU 801 obtains a remainder when the value of the variable n is divided by “3”. It is determined whether “n% 3” is “1” (step S1109).

  If the remainder “n% 3” obtained by dividing the value of the variable n by “3” is “1” (the determination in step S1109 is YES), the CPU 801 indicates the sensor board 201 (#n) indicated by the value of the variable n. ) The first and fourth string resonance circuits 501 (# n / # 1) and 501 (# n / # 4) are driven (step S1113). This is an example of the resonance circuit 501 that resonates on the sensor substrate 201 (# 1) at the time division timing of phase = 2 in FIG. 7, for example.

  If the remainder “n% 3” obtained by dividing the value of the variable n by “3” is not “1” (the determination in step S1109 is NO), the CPU 801 divides the value of the variable n by “3”. It is determined whether or not the remainder “n% 3” is “2” (step S1110).

  If the remainder “n% 3” obtained by dividing the value of the variable n by “3” is “2” (YES in step S1110), the CPU 801 indicates the sensor substrate 201 (#n) indicated by the value of the variable n. ) The second and fifth string resonance circuits 501 (# n / # 2) and 501 (# n / # 5) are driven (step S1111). This is an example of the resonance circuit 501 that resonates on the sensor substrate 201 (# 2) at the time division timing of phase = 2 in FIG.

  When the value of the variable n is divided by “3”, the remainder “n% 3” is not “2” (the determination in step S1110 is NO), that is, the value of the variable n is divided by “3”. When the remainder “n% 3” is “0”, the CPU 801 causes the resonance circuit 501 (# n / # 3) of the 3rd and 6th strings on the sensor board 201 (#n) indicated by the value of the variable n. And 501 (# n / # 6) are driven (step S1112). This is an example of the resonance circuit 501 that resonates on the sensor substrate 201 (# 0) or 201 (# 3) at the time division timing of phase = 1 in FIG.

  By the determination processing from step S1103 to step S1110, as described above with reference to FIG. 7, only one coil 301 that is separated from each other by two coils 301 on the same sensor substrate 201 (#n) has one phase. In the adjacent sensor substrates 201 (# n−1 and #n or #n and # n + 1), the coils 301 separated by the two coils 301 also in the longitudinal direction of the neck portion 102. Only the coil 301 is driven, and all the coils 301 are made to resonate in the three phases 0, 1, and 2. As a result, it is possible to detect each string 111 with high accuracy while suppressing interference caused by electromagnetic induction between the coils 301.

  After the driving process of the resonance circuit 501 in step S1111, S1112, or S1113, the CPU 801 increments the value of the variable n by +1 (step S1114), and determines whether or not the value of the variable n has reached the value “N”. Determination is made (step S1115). When the value of the variable n has not reached the value “N” (when the determination in step S1115 is NO), the CPU 801 returns to the process of step S1103 and executes the control process for the next sensor substrate 201 (#n). .

  When the value of the variable n has reached the value “N” (when the determination in step S1115 is YES), the CPU 801 detects the pressed string in the resonance circuit 501 resonated in the current phase indicated by the value of the variable phase. The position information of the resonance circuit 501 (the number of the sensor board 201 and the number of the resonance circuit 501 corresponding to the number of the string 111 in the sensor board 201) is stored in a predetermined storage area in the RAM 803 as a string-pressing position candidate ( Step S1116).

  Thereafter, the CPU 801 increments the value of the variable phase by +1 (step S1117), and determines whether or not the value of the variable phase exceeds the value “2” (step S1118). If the value of the variable phase does not exceed the value “2” (when the determination in step S1118 is NO), the CPU 801 returns to the process in step S1102 and executes control processing for the next phase (time division timing).

  When the value of the variable phase exceeds the value “2” (when the determination in step S1118 is YES), the string detection processing from all the resonance circuits 501 on all the sensor substrates 201 is completed. In this case, the CPU 801 has the largest number among the resonance circuits 501 in which the string is detected by the number stored in a predetermined storage area of the RAM 803 for each number of the strings 111 from the first string to the sixth string ( The maximum fret number of the sensor substrate 201 (maximum fret number) is detected as the string-pressing position of the number of the string 111 (step S1119).

  Thereafter, the CPU 801 executes a preceding trigger process (step S1120).

  FIG. 12 is a flowchart illustrating a detailed example of the preceding trigger process in step S1120.

  First, the CPU 801 receives the output of each string 111 of the hex pickup 105 (FIG. 1) (step S1201).

  Next, the CPU 801 corresponds to the string-pressed position determined in step S1001 in FIG. 10 (the process of the flowchart in FIG. 11) for the number of the string 111 whose vibration level is equal to or higher than a predetermined value among the outputs received in step S1201. The sound generation control data for instructing to generate the note having the pitch to be played with the velocity designated separately and the timbre of the timbre switch detected in the switch processing of step S902 in FIG. 9 is output to the sound source unit 806 (step S1202). .

  After the process of step 1202, the CPU 801 ends the preceding trigger process of step S1120 of FIG. 11 shown in the flowchart of FIG. 12, and ends the string pressing position detection process of step S1001 of FIG. 10 shown in the flowchart of FIG. .

  In FIG. 10, after the pressed position detection process in step S1001, the CPU 801 executes a string vibration process (step S1002). Here, it is detected which string 111 near the hex pickup 105 (FIG. 1) the player has played and which string 111 has been finished. FIG. 13 is a flowchart showing a detailed example of the string vibration processing in step S1002 of FIG.

  First, the CPU 801 receives a vibration signal of each string 111 from the hex pickup 105 (FIG. 1) (step S1301).

  Next, the CPU 801 acquires the period from the vibration signal of each string 111, and executes a pitch extraction process for extracting a pitch (pitch frequency or pitch period) from this period (step S1302). Here, the vibration pitch of the string 111 is extracted based on, for example, the technique described in Japanese Patent Laid-Open No. 01-177082.

  Finally, the CPU 801 executes a mute detection process (step S1303). In this process, the CPU 801 determines whether or not the vibration level of the string 111 is lower than a predetermined threshold value for the string 111 that is not instructed to mute, and corresponds to the string 111 when this determination is YES. The mute flag, which is a variable on the RAM 803, is turned on.

  After the process of step S1303, the CPU 801 ends the string vibration process of step S1002 of FIG. 10 shown in the flowchart of FIG.

  In FIG. 10, after the string vibration processing in step S1002, the CPU 801 executes integration processing (step S1003). Here, the string position and string vibration state newly detected in steps S1001 and S1002 are integrated into the current string position and string vibration state. FIG. 14 is a flowchart illustrating a detailed example of the integration process in step S1003 of FIG.

  First, the CPU 801 supplies the pitch data extracted by the pitch extraction process in step S1302 of FIG. 13 to the sound source unit 806 (see FIG. 8) (step S1401). As a result, the tone generator unit 806 uses the pitch data newly supplied from the CPU 801 as the pitch of the musical tone that has been started to sound in the preceding trigger process in step S1120 in FIG. 11 (step S1202 in FIG. 12). Correct with. As a result, it is possible to generate a musical tone with a pitch that takes into account the pitch determined by the actual vibration of the string 111.

  Next, the CPU 801 determines, for each string 111, whether or not the mute flag on the RAM 803 is set to ON (step S1402). The CPU 801 transmits a mute instruction signal to the sound source unit 806 for the string 111 for which the mute flag is on (YES in step S1402) (step S1403). As a result, the sound source unit 806 mutes the sounding note that has received the mute instruction signal.

  After the process of step S1403 or when the determination in step S1402 is NO, the CPU 801 ends the integration process of step S1003 of FIG. 10 shown in the flowchart of FIG.

  After the integration process in step S1003 in FIG. 10, the CPU 801 ends the performance detection process in step S903 in FIG.

  In the embodiment described above, generally, on the high-pitched side of the stringed instrument, the interval between the fretboards of the fingerboard is shortened, and the distance from the fingerboard to the string is further increased. For this reason, also in this embodiment, on the side close to the body portion 101 of the neck portion 102, the interval between the coils 301 on the sensor board 201 installed under the fingerboard 108 is narrowed, and the inductance of the coil for detection is also reduced. There is a need to increase it. As a result, the electromagnetic induction interference is increased on the high sound side. In order to solve this problem, control may be performed to change the number of phases according to the position of the sensor substrate 201 (on the body 101 side or the head portion 103 side). For example, at the position of the sensor substrate 201 close to the head portion 103 and having a small vertical distance from the surface of the fingerboard 108 of the neck portion 102 to the string 111, there are three resonance circuits 501 that are simultaneously driven on the sensor substrate 201 in one phase. Thus, 6 strings are detected in 2 phases. Further, in the center of the neck portion 102 (near the middle between the head portion 103 and the body portion 101), the vertical distance from the surface of the finger plate 108 of the neck portion 102 to the chord 111 increases, so that the phase on the sensor substrate 201 is one phase. Two resonance circuits 501 are driven simultaneously, and six strings are detected in three phases. Furthermore, since the vertical distance from the surface of the fingerboard 108 of the neck portion 102 to the string 111 is further increased at the position of the sensor substrate 201 close to the trunk portion 101, the resonance circuit 501 that is simultaneously driven on the sensor substrate 201 in one phase. Is one, and 6 strings are detected in 6 phases. In this way, it is possible to maintain a constant detection accuracy of the string-pressing position in accordance with the position of the sensor substrate 201 on the neck portion 102.

  15 shows capacitors in the resonance circuits 501 (# n / # 1) to 301 (# n / # 6) of FIG. 5 arranged on the sensor substrate 201 (#n) (0 ≦ n ≦ N−1). It is a figure which shows the example of a design of 401 (# n / # 1) -401 (# n / # 6) and coil 301 (# n / # 1) -301 (# n / # 6). In the circuit configuration of FIG. 15A, six Ls correspond to the inductance values of the coils 301 (# n / # 1) to 301 (# n / # 6) in FIG. 5, and C1, C2, C3 Are the 1st and 4th string capacitors 401 (# n / # 1) and 401 (# n / # 4) and the 2nd and 5th string capacitors 401 (# n / # 2) and 401 (#), respectively. n / # 5) corresponds to the capacitance values of capacitors 401 (# n / # 3) and 401 (# n / # 6) of 3 strings and 6 strings. By changing each value of C1, C2, and C3, the resonance circumferential (angular) frequency at which the absolute value of the impedance Z of the adjacent resonance circuit 501 in FIG. Interference due to electromagnetic induction between 301 can be suppressed. FIG. 15 shows an example in which the resonance (angular) frequency is divided into three, but it is not necessary to fix the frequency division number to 3 depending on the influence of noise. For example, generally, on the high-pitched side of a stringed instrument, the interval between the fingerboards is shortened, and the distance from the fingerboard to the strings is further increased. Thus, a configuration may be employed in which the frequency division number is reduced on the low pitch side where the vertical distance between the fingerboard surface and the metal string is close, and the division number is increased on the high pitch side.

  FIG. 16 is an explanatory diagram of the control operation of the string-pressing position detection process that incorporates the concept of frequency division described in FIG. 15 in addition to the time division processing by phase division described above with reference to FIG. Of the six coils 301 on each sensor substrate 201 (#n), only the coils 301 that are separated from each other by one coil 301 are simultaneously driven during one phase, and the other coils 301 resonate. Be stopped. In the adjacent sensor substrate 201, only the coil 301 that is separated by one coil 301 in the longitudinal direction of the neck portion 102 is driven. By detecting the string position while switching between the two phases at a high speed, it is possible to detect the string position with high accuracy while suppressing interference. In this driving method (frequency division of three or more), the same sensor substrate 201 (#n) does not drive the resonance circuit 501 having the same resonance frequency at the same time, so that interference noise transmitted with high efficiency by resonance is not easily transmitted. . Therefore, the number of coils 301 to be driven simultaneously can be increased, that is, the number of phases can be reduced, so that high-speed sensing is possible.

In this embodiment, a method for detecting a string position by using closely arranged resonance circuits has been proposed for the string detection of an electronic string instrument. However, this technique is not limited to an electronic string instrument. For example, as shown in FIG. 17, the resonance circuit 1703 is arranged in the mouthpiece part 1702 or the lead part 1701 of the electronic wind instrument, and the position and contact state of the lips when the human 1704 plays the mouthpiece part 1702 of the electronic wind instrument, The present invention can also be applied as a technique for detecting the degree of closing of the lead 1701 and the like.
In this embodiment, the capacitance of the capacitor is changed. However, the inductance value of the coil may be changed.
In the present embodiment, the positions of adjacent coils have been described as adjacent to the left and right, but the present invention is not limited to this, and may include adjacent to the upper and lower sides and diagonal lines.
Note that the sensor 502 (# n / # i) may detect a change (amount of change) in the frequency, or may detect a frequency value before and after the frequency changes. If the value of the frequency can be detected, the change in frequency can be determined by the value of the frequency before and after the change of the frequency. Therefore, the value of the frequency may be detected.

Regarding the above embodiment, the following additional notes are disclosed.
(Appendix 1)
A fingerboard with a plurality of string positions,
A plurality of resonance circuits that are provided in association with each of the string pressing positions, and whose resonance frequency changes according to a change in the distance between each of the plurality of conductive strings;
A plurality of sensors provided corresponding to each of the plurality of resonance circuits, and detecting a change in resonance frequency of each of the corresponding resonance circuits;
A drive unit that drives the resonance circuits belonging to each of the plurality of fingerboards in a time-sharing manner so that the resonance circuits to be driven are not adjacent to each other;
Based on a change in the resonance frequency detected by each of the plurality of sensors, a string-pressing position detection unit that detects the string-pressing position;
A string-pressing position detecting device comprising:
(Appendix 2)
The string-pushing position detecting device according to claim 1, wherein the number of the resonance circuits driven in a time division manner is changed according to a position on the fingerboard.
(Appendix 3)
Multiple strings,
The string-pushing position detecting device according to appendix 1 or 2,
A pre-trigger processing unit for instructing a sound source to generate a musical tone having a pitch determined based on the string position detected by the string position detection unit;
A string vibration detector that detects which string was struck;
A pitch extraction processing unit for extracting a pitch from a vibration signal of a string whose string has been detected by the string vibration processing unit;
An integrated processing unit that corrects the pitch of the musical sound generated by the sound source based on the pitch extracted by the pitch extraction processing unit;
An electronic stringed instrument comprising:
(Appendix 4)
A plurality of resonance circuits which are provided in correspondence with the respective finger pressing positions, the resonance frequency of which is changed in accordance with the distance between each of the plurality of conductive strings, and the plurality of resonances. A plurality of sensors that are provided in each of the circuits and detect a change in the resonance frequency of each of the resonance circuits;
The resonance circuits belonging to each of the plurality of finger plates are driven in a time-sharing manner so that the resonance circuits having changed resonance frequencies are not adjacent to each other,
A string pressing position detecting method, wherein the string pressing position is detected based on a change in resonance frequency detected by the plurality of sensors.
(Appendix 5)
A plurality of resonance circuits that are provided in association with each of the plurality of string pressing positions, and whose resonance frequency varies according to the distance from each of the plurality of conductive strings; A computer provided as a string-pushing position detection device, provided in each of the plurality of resonance circuits, and having a plurality of sensors that detect changes in the resonance frequency of each of the resonance circuits.
Driving the resonance circuits belonging to each of the plurality of fingerboards in a time-sharing manner so that the resonance circuits to be driven are not adjacent to each other;
Detecting the string pressing position based on a change in resonance frequency detected by the plurality of sensors;
A program characterized by having executed.
(Appendix 6)
A conductive pressing plate with a determined pressing position;
A plurality of resonance circuits provided in association with each of the pressing positions, each of which has a resonance frequency that changes in accordance with a change in the distance from the pressing plate;
A plurality of sensors provided in each of the plurality of resonance circuits, and detecting a change in the resonance frequency of each of the resonance circuits;
A drive unit that drives the resonance circuits belonging to each of the plurality of fingerboards in a time-sharing manner so that the resonance circuits to be driven are not adjacent to each other;
A pressing position detection unit that detects the pressing position based on a change in resonance frequency of each of the plurality of sensors;
A pressing position detecting device comprising:

DESCRIPTION OF SYMBOLS 100 Electronic string instrument 101 Trunk part 102 Neck part 103 Head part 104 Bridge part 105 Hexa pick-up 106 Control circuit 107 Fret 108 Finger board 109 Nut (upper piece)
110 pegs
111 String 201 Sensor board 201
202 Wiring board 301 Coil 401 Capacitor 402 Connector 501, 1703 Resonant circuit 502 Sensor 801 CPU
802 ROM
803 RAM
804 Switch unit 805 Interface unit 806 Sound source unit 807 Sound system 1701 Lead 1702 Mouthpiece 1704 Human

Claims (6)

A fingerboard with a plurality of string positions,
A plurality of resonance circuits that are provided in association with each of the string pressing positions, and whose resonance frequency changes according to a change in the distance between each of the plurality of conductive strings;
A plurality of sensors provided corresponding to each of the plurality of resonance circuits, and detecting a change in resonance frequency of each of the corresponding resonance circuits;
A drive unit that drives the resonance circuits belonging to each of the plurality of fingerboards in a time-sharing manner so that the resonance circuits to be driven are not adjacent to each other;
Based on a change in the resonance frequency detected by each of the plurality of sensors, a string-pressing position detection unit that detects the string-pressing position;
A string-pressing position detecting device comprising:   The string-pushing position detecting device according to claim 1, wherein the number of the resonance circuits driven in a time division manner is changed according to a position on the fingerboard. Multiple strings,
The string-pressing position detecting device according to claim 1 or 2,
A pre-trigger processing unit for instructing a sound source to generate a musical tone having a pitch determined based on the string position detected by the string position detection unit;
A string vibration detector that detects which string was struck;
A pitch extraction processing unit for extracting a pitch from a vibration signal of a string whose string has been detected by the string vibration processing unit;
An integrated processing unit that corrects the pitch of the musical sound generated by the sound source based on the pitch extracted by the pitch extraction processing unit;
An electronic stringed instrument comprising: A plurality of resonance circuits which are provided in correspondence with the respective finger pressing positions, the resonance frequency of which is changed in accordance with the distance between each of the plurality of conductive strings, and the plurality of resonances. A plurality of sensors that are provided in each of the circuits and detect a change in the resonance frequency of each of the resonance circuits;
The resonance circuits belonging to each of the plurality of finger plates are driven in a time-sharing manner so that the resonance circuits having changed resonance frequencies are not adjacent to each other,
A string pressing position detecting method, wherein the string pressing position is detected based on a change in resonance frequency detected by the plurality of sensors. A plurality of resonance circuits that are provided in association with each of the plurality of string pressing positions, and whose resonance frequency varies according to the distance from each of the plurality of conductive strings; A computer provided as a string-pushing position detection device, provided in each of the plurality of resonance circuits, and having a plurality of sensors that detect changes in the resonance frequency of each of the resonance circuits.
Driving the resonance circuits belonging to each of the plurality of fingerboards in a time-sharing manner so that the resonance circuits to be driven are not adjacent to each other;
Detecting the string pressing position based on a change in resonance frequency detected by the plurality of sensors;
A program characterized by having executed. A conductive pressing plate with a determined pressing position;
A plurality of resonance circuits provided in association with each of the pressing positions, each of which has a resonance frequency that changes in accordance with a change in the distance from the pressing plate;
A plurality of sensors provided in each of the plurality of resonance circuits, and detecting a change in the resonance frequency of each of the resonance circuits;
A drive unit that drives the resonance circuits belonging to each of the plurality of fingerboards in a time-sharing manner so that the resonance circuits to be driven are not adjacent to each other;
A pressing position detection unit that detects the pressing position based on a change in resonance frequency of each of the plurality of sensors;
A pressing position detecting device comprising: