JPH0228555Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [TECHNICAL FIELD OF THE INVENTION] The present invention relates to electronic string instruments (eg, guitar synthesizers).

[Prior art and its problems] Recently, with the rapid development of electronic technology and digital technology, so-called electronic stringed instruments have been developed in which these technologies are applied to stringed instruments. These electronic stringed instruments can be roughly divided into electronic plucked stringed instruments, represented by electric guitars and guitar synthesizers, and electronic stringed instruments, represented by electronic violins. By using the gulling operation to specify the pitch of the musical note being generated, by operating the other hand or the bow,
Its purpose is to generate musical tones with specified pitches. For this reason, efforts to develop electronic string instruments have focused on how to detect the fingering operation position with high precision and high speed.

Typical fingering operation position detection methods include (1) the so-called flet switch method (for example, Utility Model Application No. 58-175596), U.S. Pat. No. 4,570,521;
(2) So-called capacitive sensing method (e.g.
(3) so-called pitch extraction method (for example, Japanese Patent Publication No. 57-58672), (4) so-called resistance fret voltage application/conductive string detection method (for example, Japanese Patent Application Publication No. 1987-500748) ), (5) so-called ultrasonic electroplating method (for example, Japanese Patent Application Laid-Open No. 62-99790), (6) so-called string current supply/conductive fret piece detection method (for example, Japanese Patent Application Publication No. 60-501276), (7 ) So-called string electric pulse application/conductive fret detection method (for example,
JP-A-62-174795), (8) So-called string current supply
Fret-to-fret potential difference detection method (for example, JP-A-59
-176783), (9) so-called string current supply/induced voltage detection method (e.g., JP-A-62-47698), (10) so-called resistor embedding method (e.g., JP-A-62-176-47698);
70895), (11) A so-called resistance value detection method for a resistance string (for example, Japanese Patent Laid-Open No. 154297/1983) is known or proposed.

By the way, on traditional acoustic guitars and electric guitars, when a specific string is pressed (fingering) and the corresponding string is picked, In response, a musical tone having a pitch corresponding to the fingering operating position can be generated, and on the other hand, when the corresponding string is picked under the open string operating state, the open string operating state Not only is it possible to generate a musical tone with an open string pitch corresponding to the fingering operation position, but also while generating a musical tone with a pitch corresponding to the fingering operation position by the picking operation,
When the fingering operation position is shifted from the fingering operation position to another fingering operation position (this playing method is referred to as a "sliding playing method"), the effective vibration length of the string increases or decreases in accordance with the transition. Therefore, the pitch (that is, the frequency) of the musical tone currently being generated is changed to the pitch corresponding to the other fingering operation position, and on the other hand, from the fingering operation position, the open string operation When the operation state is changed to the state, the effective vibration length of the string suddenly becomes the maximum vibration length as the operation state changes, so the string vibration of the string that is currently vibrating is suddenly suppressed, and as a result, the string vibration that is currently occurring is suddenly suppressed. The musical tone is immediately muted (this playing method is sometimes referred to as the "left-handed miute playing method").

In this way, in acoustic guitars, electric guitars, etc., there is a transition from the fingering operating position to another fingering operating position, or a transition from the fingering operating position to the open string operating state. Special musical tone control is performed depending on the type of transition performed.

However, in the case of conventional electronic stringed instruments,
In both cases, while a musical tone is being generated, depending on when the current fingering operation position shifts to another fingering operation position, or when the current fingering operation position shifts to the open string operation state,
In the former case, it is not possible to change the pitch of the musical tone being generated to the pitch corresponding to the destination fingering operation position, while in the latter case, it is not possible to mute the musical tone being generated. Therefore, it was not possible to completely simulate the acoustic guitar playing method.

[Purpose of the invention] Therefore, the purpose of the invention is to provide an electronic stringed instrument that can produce special musical sound effects when played in the same way as a traditional stringed instrument.

[Summary of the invention] In order to achieve the above-mentioned object, this invention generates a musical tone having a pitch corresponding to the fingering operation position detected by the fingering operation position detection means, in accordance with the instruction of the musical sound generation instruction means. If the determining means determines that the fingering operating position has shifted to the open string operating state while the musical tone is being generated, in response to this, control is performed to mute the musical tone that is being generated. On the other hand, from the fingering operation position, the discrimination means
If it is determined that the fingering operation position has moved to another fingering operation position other than the fingering operation position, in response to this, the fingering operation position is moved to the fingering operation position while continuing to generate the musical tone that is being generated. The key point is to perform control to change the pitch from the pitch to the pitch corresponding to the other fingering operation position.

[Operation and development of the invention] An example of the operation of this invention will be explained with reference to FIG.

In the figure, A to C relate to the pitch (frequency) changing function, D to C relate to the open string silencing function, and G relates to the selection function for adjusting both functions. First, as shown in Figure 1A, one of the strings is picked,
Assume that the string trigger switch is turned on and a string trigger is detected. When the string trigger switch is turned on, musical tones begin to be produced, and the fretting position of the triggered string is checked to determine the pitch at which the notes should be produced. Here, as shown in FIG. 4B, the fret state sensing means or the frett switch that senses the triggered fret operation position of the string is in a state where the A pitch is specified. Therefore, the sound source (not shown) is instructed to start producing the musical tone of pitch A as the musical tone of the triggered string, and as shown in C of the same figure, within the sound source, the tone of pitch A is started. A musical sound waveform with a frequency is generated.

Next, as shown in FIG. 4B, suppose that while the musical tone of the triggered string is being sounded, another fret position belonging to that string is pressed and the condition changes to specify the B pitch. In contrast, the musical tone control means controls the sound source to change the pitch of the musical tone of the strings currently being produced to the B pitch without muting the musical tone. As a result, as shown in Figure C, the sound source generates a musical sound waveform in which only the frequency is changed to the frequency corresponding to the B pitch.

In this way, in the case of the present invention, once the musical tone of the string has started to be produced by picking, it will not be muffled by the subsequent change of the fretting position.
Moreover, a new sound generation is not started by operating a new fret position, but only the frequency or pitch of the musical tone changes as the fret operating position is changed. Therefore, except for the attack at the beginning of the sound due to picking, it is possible to play smooth phrases with no attack after that, and the same performance effect can be achieved with the same performance operations as on a traditional guitar. Obtainable. The above is the pitch changing function, which is one of the features of the present invention.

Next, the open string silencing function will be explained. Now, in FIG. 1D, it is assumed that one of the strings is picked, the string trigger switch is turned on, and a string trigger is detected. When the string trigger switch is turned on, musical tones begin to be produced, and the fretting position of the triggered string is checked to determine the pitch at which the notes should be produced.
Here, as shown in FIG. 4E, one of the fretswitches associated with this triggered string is on. Assuming that the fret position of the fret switch that is currently on corresponds to pitch A,
This means that the fret operation position corresponding to this A pitch is sensed by the fret state sensing means. Therefore, as the musical tone of the triggered string, the start of the musical tone of pitch A is the sound source (not shown).
, and a musical sound waveform having a frequency of pitch A is generated within the sound source, as shown in FIG.

Next, as shown in Figure E, while the musical tone of the triggered string is playing, all frets belonging to that string are in an open state (so-called open string state).
Suppose that it changes to . In other words, I let go of the frets I had been holding down.

Here, the open string silencing means uses the change to the open string state as a signal to control the sound source to mute the musical tone being produced. As a result, the musical sound waveform output from the sound source is attenuated and muted, as shown in FIG.

In this way, in the case of the present invention, once the musical tone of the string starts to be produced by picking (string trigger),
Thereafter, when the fret state changes to an open string state, the sound is attenuated and muted from that point on.

The above is another feature of this invention, which is the open string silencing function.

According to this invention, when a fingering operation position that is currently being operated is moved to another fingering operation position while a musical tone is being generated, the pitch of the currently generated musical note is changed in response. While changing the pitch to the one corresponding to the destination fingering operation position (achieving the pitch change function), in response to the transition from a specific fingering operation position to the open string operation state, , it is possible to mute the musical tone that is being produced (realization of an open string mute function).

[Embodiment] An embodiment of this invention will be described below with reference to the drawings.

<Musical Instrument Body> The main body of the electronic stringed instrument according to this embodiment is shown in FIG. As shown in the figure, the main body of the stringed instrument has the shape of a guitar, consisting of a body 1, a neck 2, and a head 3, and a plurality of strings 4 for playing the stringed instrument are strung along its length. Further, the body 1 is provided with a parameter setting switch 5 for setting various parameters, such as a tone select switch group 5a for selecting a tone, a mute switch 5b, and a mode changeover switch 5c for when the string is released. There is. A rhythm pad switch group 6 is also provided as an operator for manual rhythm performance. In addition, SP
is a speaker for emitting the played musical tones.

In detail, the string 4 is adjustable at one end on a peg 7 provided in the head 3, extends over the fingerboard 8, and is placed in a string trigger switch storage case 11 on the right side of the body 1. The other end is fixed. The finger board 8 is provided with a matrix of frett switches FSW for specifying pitches, and by pressing the top of the string 4 between the frets 12, the corresponding frett switch FSW is turned on. . Details of the flexible switch FSW will be described later.

On the other hand, inside the case 11 is a string trigger switch.
The TSW is housed, and by plucking or pinching string 4 connected to this string trigger switch TSW, the string trigger switch TSW is turned on, which starts producing musical tones. It's becoming like that. Details of the string trigger switch TSW will be described later.

<Flet switch> Figure 3 shows an example of the configuration of a frett switch FSW. As shown in the figure, a printed circuit board 13 and a rubber sheet 14 are placed in a recess 2a formed on the upper surface of the neck 2.
is fitted and fixed. Rubber sheet 14
is laminated and adhered onto the printed circuit board 13, and both ends of the rubber sheet 14 are bent into a U-shape so as to wrap around both ends of the printed circuit board 13 and fix the printed circuit board 13. On the lower surface of the rubber sheet 14 that is joined to the upper surface of the printed circuit board 13, there are 6 wires along the longitudinal direction of the necks 2 at positions corresponding to each string 4.
A row of contact recesses 15 are formed. Electrodes 16 as movable contacts are patterned on the upper bottom surface of each contact recess 15, while electrodes 17 as fixed contacts are patterned on the printed circuit board 13 facing each electrode 16. This electrode 1
7 and the electrode 16 constitute a frett switch FSW for specifying a predetermined pitch.
Therefore, when the rubber sheet 14, which is the surface of the finger board 8, is pressed from above the string 4, the electrode 1
6 and 17 are connected and the flet switch is activated.
FSW is now turned on.

<String Trigger Switch> Fig. 4 shows an example of the configuration of the string trigger switch TSW. As mentioned above, the string trigger switch
The TSW is switched by the string 4 on the body 1. As shown in the figure, a switch part mounting base 18 is provided on the body part 1, and this switch part mounting base 18 has a part that is formed high. A support portion 18a is provided. A number of grooves 18b corresponding to the number of strings 4 used are formed in this support portion 18a. Support part 18 provided with this groove part 18b
A metal contact plate 19 is attached to the rear edge side of the string a, and an insertion hole 19a is provided in the contact plate 19 at a position corresponding to each string 4. A conductive member 20 integrally connected to each string 4 is attached to this insertion hole 19a. This conductive member 20 is a metal round bar-shaped member having a predetermined length, and has a locking hole 20a at its tip for locking the string 4.
The string 4 is locked through this locking hole 20a. A first retaining ring 20b is provided behind the locking hole 20a, and a second retaining ring 20c is provided at a predetermined distance from the first retaining ring 20a. This first retaining ring 20b and second retaining ring 20c
is a pair of insulating members 21 attached to the conductive member 20 at a predetermined distance from each other;
21 from moving in the longitudinal direction of the conductive member 20. A step portion is provided inwardly of each of the insulating members 21, 21, and a spring coil 22 as a conductive flexible member is spanned over the step portion.
Behind the second retaining ring 20c of the conductive member 20, a support shaft 20d is provided which is formed to be one step thinner, and the rear end of this support shaft 20d is connected to the support portion 18a.
inside the groove 18b and the insertion hole 19 of the contact plate 19.
The contact plate 19 is inserted through the inside of the contact plate 19, and its rear end is pivotably locked around the insertion hole 19a of the contact plate 19 by a stopper 23 having a hemispherical tip. Therefore, the rear end of the conductive member 20 is swingably locked by the support shaft 20d, and the other free end is supported so as to be stretched by the string 4. A protruding piece 19b formed at the upper end of the contact plate 19 corresponding to each of the insertion holes 19a is inserted and fixed at a predetermined position of the printed circuit board 24 provided on the support portion 18a, and It is connected to the wiring pattern via solder 19c. Further, a lead wire 22 is drawn out from one end of a coil spring 22 attached to the conductive member 20 via an insulating member 21.
A is also connected to another wiring pattern on the printed circuit board 24 via solder 22b.

The illustrated trigger switch TSW described above is a switch that uses the conductive member 20 as a first contact and the coil spring 22 as a second contact. In a steady state, the coil spring 22 and the conductive member 2
0, a gap corresponding to the thickness of the insulating member 20 is maintained, and the two are in an insulating relationship. However, when the string 4 is operated and a certain amount of vibration is generated, the coil spring 22 vibrates due to this vibration, and as a result, the distance between the conductive member 20 and the coil spring 22 changes over time. , there will be repeated periods of contact and non-contact. In other words, the trigger switch TSW turns on and off. As will be described later, in this embodiment, the first change of the trigger switch TSW to the on state (the trigger of the string 4) is reliably detected.

<Overall Circuit Configuration> FIG. 5 shows the overall circuit configuration of the electronic stringed instrument according to this embodiment. The entire instrument is controlled by a microcomputer 30. The output from the string trigger switch group TSW described above is input to the latch circuit 40, and the microcomputer 30 detects the trigger of the string 4 through this latch circuit 40. In addition, the status of each switch in the above-mentioned flex switch group FSW and each of the various switches in the panel switch group PSW (various switches provided on the body 1 such as the parameter setting switch group 5 and the rhythm pad switch group 6 shown in FIG. 2) are also explained. The status of the switch is transmitted to the microcomputer 30 via the switch status detection circuit 50. The musical tone generating circuit 60 generates musical tone signals under the control of the microcomputer 30. The generated musical tone signal is amplified by the amplifier 70 and emitted to the outside through the speaker PS.

<General flow of microcomputer> Figure 6 shows the microcomputer 30 (Figure 5)
shows the general flow of When the power is turned on, the microcomputer 30 first performs initialization processing G1. After initialization,
Repeat the processing from G2 to G8. In the string trigger detection process G2, the output of the latch circuit 40 shown in FIG. to generate musical sounds. In the frett state detection process G3, the state of each switch in the frett switch group FSW is read via the switch status detection circuit 50. and,
In the fret state change determination process G4, a change in the fret state (change in pitch designation) is determined, and if there is a change, the fret state change process G5 is executed.
In this process G5, when the pressing position of the fret belonging to the string that is currently sounding changes, the pitch of the string is reset to the corresponding pitch (the string is set to the sound source module in the musical sound generation circuit 60 that is currently sounding). ). When any of the fretswitches FSW belonging to a string that is producing sound is released, the sound is muted when the string changes to a so-called open string state. Furthermore, nothing is done in response to changes in the pressed state of fret strings that belong to strings that are not currently being sounded. Next, in panel switch state detection processing G6, the panel switch group
The status of each switch of the PSW is read through the switch status detection circuit 50. Then, in panel switch state change processing G7, a change in the state of the panel switch is determined, and if there is a change,
In panel switch state change processing G8, necessary processing is performed, for example, processing for setting tone, effect, etc. for musical tone generation circuit 60.

<Characteristics of the Embodiment> Before entering into individual detailed descriptions, some of the features of the embodiment will be briefly explained.

The first feature is reliable string trigger detection. The principle is shown in a waveform diagram in FIG. Figure a schematically shows the vibration waveform of string 4.
Figure b shows the string trigger switch for this string vibration.
Indicates the TSW status. As you can see from the comparison of the two, the string trigger switch TSW turns on and off repeatedly as string 4 vibrates. When the vibration of the string 4 is attenuated to a certain degree or more, the string trigger switch TSW stops operating and becomes OFF. Simply sampling the output of this type of string trigger switch TSW cannot reliably and accurately detect the start of string vibration, that is, the string trigger.

Therefore, in this embodiment, as shown by the latch output in FIG.
By sampling, the string trigger is detected, and after a predetermined period of time has elapsed after the detection, the microcomputer 30 applies a latch reset signal shown in FIG. 4D to the latch to reset the latch.

The second feature is the lingering effect of musical tones when the same string 4 is played continuously. This function is realized by the separate sound source assignment sound generation function included in the microcomputer 30. This principle is shown in FIG.
Now, suppose that the first trigger of a certain string 4 is detected via the string trigger switch TSW as shown in FIG. In response, the microcomputer 30 searches for a sound source to generate sound, and instructs the found sound source (here, sound source 1) to start generating sound.
As a result, the sound source 1 creates the previous musical sound waveform shown in FIG. Next, it is assumed that the same string 4 is picked again while the musical tone of this string 4 is being played (on again in a of the same figure). In response to this re-trigger, the microcomputer 30 instructs the sound source 1 that was generating the previous musical tone to mute the sound, and at the same time sends a sound source 2, which is different from this sound source 1, to generate the musical tone of the string that has been triggered again. allocate for. As a result, after the re-triggering, while the sound source 1 that was generating the previous musical tone attenuates that musical tone, the subsequent musical tone is generated by the sound source 2 and rises (see b in the same figure).
Therefore, it is possible to obtain an effect similar to the lingering sound effect of a resonance box (sound box) of an acoustic guitar.

The third feature is the muffling function based on the elapsed pronunciation time. That is, the microcomputer 30 measures a predetermined period of time after the musical tones start to be produced, and after that elapsed time performs the muting process. This principle will be explained with reference to FIG. When the string 4 is triggered and detected as shown in FIG. (This has already been mentioned).
On the other hand, it starts counting the sounding time of that sound source. As a result, musical tones are generated by the designated sound source as shown in FIG. In the case of FIG. 9, musical tones continue to be generated from the sound source even when the measurement of the sound generation time shown in b is completed. Therefore, the microcomputer 30 uses the end of the sound generation time as a signal.
Instruct the sound source to mute. As a result, the sound source shifts to attenuation mode (release mode) to attenuate and silence the musical sound.

In particular, in this embodiment, the length of the sound generation time is determined for each timbre.

The fourth, fifth, and sixth features are, respectively, a pitch change function based on a change in fret status, an open string silencing function based on a change in open string status, and a selection function to adjust between the two functions. These have already been described in the section ``Effects of invention,'' and the explanation will be omitted as it will be redundant.

The seventh feature is the ability to mute musical tones at high speed in addition to normal muting (high-speed muting function). 10th
The principle is shown in the figure. As shown in the figure, the production of musical tones is started when the string trigger switch TSW is turned on, as in the previous case (see a and c in the same figure). However, in the case of FIG. 10, the mute switch 5b (see FIG. 2) is pressed while the strings are producing musical tones. In response, the microcomputer 30 instructs the sound source module that is generating the musical sound signal to perform high-speed muting, and in response, the sound source module rapidly attenuates the musical sound signal that is being generated and mutes the sound. .

By adding such a high-speed muting function, it is possible to create a performance effect similar to the cutting technique used on an acoustic guitar.

In addition, in FIG. 10, the on-operation of the meyuto switch 5b is depicted as affecting only one musical sound waveform, but in the example described in detail later, all musical tones that are generated when the meyuto switch 5b is turned on will be affected. High-speed muting is now instructed for the sound source module. In other words, all the strings that are sounding are muted at the same time.

How the characteristic functions and other functions described above are specifically realized will be clarified through the detailed explanation below.

Latch Circuit (FIG. 11) First, FIG. 11 shows an example of the configuration of the latch circuit 40 shown in FIG. 5, which is used to realize a reliable string trigger detection function. In the same figure, from TRI1
TRI6 is each switch output of the string trigger switch TSW provided for each string 4 from the first string to the sixth string. For example, TRI1 is the switch output of the string trigger switch TSW for the first string.
Each switch output TRI1 to TRI6 becomes “L” when the string trigger switch TSW is on, and “H” when it is off.
becomes. Each switch output TRI1 to TRI6 is passed through each inverter I1 to I6 to each latch circuit (RS
40-1 to 40-6 (constructed to work as flip-flops), each of the latch circuits 40-1 to 40-6 is input by changing the switch outputs TRI1 to TRI6 from "H" to "L". 40-6
is set, and its outputs TRI1 to TRO6 are “H”
become. That is, when the string trigger switch TWR turns on for the first time, the corresponding latch circuits 40-1 to 40-6 are set, and thereafter their outputs are kept at "H". Each latch output
TRO1 to TRO6 are periodically sampled by the microcomputer 30 in the string trigger detection process G2 (the details of which will be described later) in FIG. As described later, the microcomputer 30
By detecting that the latch circuit changes from the "L" reset state to the "H" set state, it detects a string trigger and controls the start of sound production of musical tones. Furthermore, after detecting this string trigger,
Measure the passage of a predetermined time, and after that, the 11th
The corresponding latch circuits 40-1 to 40-6 are reset via the latch reset inputs CR1 to CR6 shown in the figure.

Registers Related to String Trigger Detection (FIG. 12) FIG. 12 shows a portion of the registers used internally by the microcomputer 30 for string trigger detection. The registers indicated by RTBIT are the latch circuits 40-1 to 40-1 described above.
It is used to store the previous sample value of each output of 40-6. Register as shown
The least significant bit of RTBIT is the first latch circuit 40-
The previous sample value of 1, the second bit is the previous sample value of the second latch circuit 40-2, and the same applies hereafter, and the sixth bit is the previous sample value of the sixth latch circuit 40-2. On the other hand, RSTCT1
The registers designated ~RSTCT6 are reset counters used to measure the time required to reset the corresponding latch circuits 40-1 to 40-6 after detection of a string trigger. For example, when a trigger on the first string is detected through the latch circuit 40-1, a predetermined value is preset in the first reset counter RSTCT1, which is counted down at each predetermined time interval, and when a borrow occurs (underflow occurs). ), latch circuit 4
A reset signal is sent to 0-1.

Trigger Detection Process (FIG. 13) FIG. 13 is a detailed flowchart of the trigger detection process G2 (FIG. 6). First, in process P1, the accumulator of the microcomputer 40
Latch circuit output TRO1 to TRO in Figure 11 to ACC
6 is read. The accumulator ACC has
From the least significant bit, TRO1 to TRO6, respectively.
The sample value up to is set, and the upper two bits are undefined. Note that the ACC, B-RG, C-RG, and D-RG registers are all 8 bits. In the next process P2, the illustrated process is executed.
Here, EXOR indicates the exclusive OR operation,
AND indicates a logical product operation. This process P
As a result of step 2, the sample value of the current latch output is saved in register D-RG, and the sample value of the current latch output is saved in register D-RG.
The first to sixth bits of RG contain the sample value of the previous latch output that is “L” and the sample value of the current latch output that is “H”, that is,
String trigger switch turned on for the first time
Only those related to TSW are set to "H" or "1", and the others are set to "L" or "O". Further, as the string number, 1 indicating the first string is set in the register B-RG.

The loop from process P3 to process P10 is where trigger-on processing is performed based on the value of each bit of register C-RG. In process P3, register C-RG is shifted by one bit in the right direction (from the upper bit to the lower bit), and
“O” for the most significant bit MSB of RG, CARRY
Set the least significant bit LSB. In the next determination process P4, the value of CARRY is determined. Assume that CARRY=1 is obtained in this determination. This indicates that one of the strings has been triggered (more specifically, it has been detected through the latch circuit 40 that the string trigger switch TSW of a certain string has changed to the on state for the first time), and which string has been triggered. It is given by the string number register B-RG. Therefore, if CARRY=1, the process advances to step P5, where a predetermined value (time data until latch reset) is set in the reset counter RSTCT corresponding to the value of the register B-RG.
Then, in the next process P6, registers B-RG are selected from the pitch data for each string saved in the fret state detection process G3 of FIG.
The pitch data of the string number indicated by the value of is stored in register P-
Load into RG. Subsequently, in process P7,
Sound source assignment and sound generation processing for the musical tone generation circuit 60 (FIG. 5) is executed.

CARRY after processing P7 or in discrimination processing P4
When = 0, proceed to process P8, where register B-RG is incremented by 1 to advance the string number by one, and in the next determination process P9, it is checked whether the value of register B-RG is 6 or less, If it is 6 or less, the loop from process P3 is repeated.

Once you have completed the loop for all strings,
Proceeding to P10, the latch output sampled this time, which is the contents of register D-RG, is saved in register RTBIT. This saved data is used as the previous sample value in process P2 when the trigger detection flow (FIG. 13) is executed next time.

Latch reset processing (Figure 14) As mentioned above, the trigger detection flow (Figure 13)
At step P5 in FIG. 1, information on the time until the string is reset is set in the reset counter RSTCT (FIG. 12) of the string that was triggered. In this regard, the microcomputer 40 performs processing for resetting the rat after a predetermined period of time from the trigger in a time interrupt routine that is interrupted at a predetermined interval time. The flow of this latch reset processing (time interrupt routine) is shown in FIG.
Q1 to Q3 are processing for the first string,
In Q1, the first bit of register RTBIT is “1”
By checking whether or not the first latch circuit 40-1 (see FIG. 11) corresponding to the first string is set, it is determined whether or not the first latch circuit 40-1 (see FIG. 11) is set.
Proceed to Q2 and reset the 1st string reset counter RTCT
1 is subtracted, and if a borrow occurs, the first bit of the register RTBIT is set to "0", and the first latch circuit 40-
A low pass is output to the reset line CR1. As a result, the first latch circuit 40-1 is reset.

Hereafter, in the same manner, the second string, third string, fourth string,
Processes Q4 to Q18 are performed on the fifth and sixth strings.

<String Trigger Detection Function> From the explanation so far, it is clear that this embodiment has a reliable string trigger detection function. That is, when each string 4 (Fig. 2) starts to vibrate, the corresponding string trigger switch TSW (No. 4
) turns from off to on, thereby setting the corresponding latch circuits 40-1 to 40-6. At the time of the next latch data sampling after this setting, the microcomputer 40 (Fig. 5) executes the trigger detection process shown in Fig. 13, detects which string has been triggered through comparison with the previous latch sample, and Based on the detection, processes such as starting the sound generation of musical tones (see processes P6 and P7) are performed, and a reset counter RSTCT (FIG. 12) of the triggered string is preset in process P5. This set reset counter
RSTCT is subtracted every time an interrupt occurs in the latch reset process (time interrupt routine) shown in FIG. As a result, after a predetermined period of time has elapsed since the string was triggered, its reset counter RSTCT underflows, and at that time the triggered string's latch circuit 40
-1 to 40-6 are reset (for example, processing Q
(See 3). Therefore, exactly the functions described with reference to FIG. 7 are realized.

Assignment and sound generation processing (FIGS. 15 and 16) Next, details of the assignment and sound generation processing P7 in the flow of FIG. 14 will be explained.

In this assignment and sound generation process, the microcomputer 30 (FIG. 5) starts the sound generation of the musical tone of the triggered string, but at the same time, the third feature of this embodiment mentioned above, that is, when the same string is played continuously. The lingering effect of musical sounds when played is also achieved through this process.

Detailed flow of assignment/pronunciation processing (Part 16)
Before proceeding with the explanation of Figure 1, some of the registers used in this flow will be explained.

First, the control registers of each sound source module (here, the musical sound generating circuit 60 is composed of eight sound source modules) of the musical tone generating circuit 60 (FIG. 5) are configured as shown in FIG. There is. In the same figure, MODULE 1 to MODULE
The eight register groups No. 8 correspond to No. 1 to No. 8 of each sound source module of the musical tone generating circuit 60, and are register a, register b, and counter c, respectively.
It consists of A value corresponding to the number of the string being sounded is written into register a. However, when the value is zero, it specifically indicates that the corresponding sound source module is not being sounded. Pitch data that is currently being produced is written into register b. The counter c is a counter for counting the sounding time, and is set to a predetermined value when the sound source is sounded.
LASTMD is a register for assigning a sound source module, and its operation will be explained later.

D-RG shown in FIG. 16 is a register in which a value corresponding to the sound source module number is stored, and E-RG
is a register for counting loops.

The flow of the assignment/sound generation process (FIG. 16) will be explained below.

The first half of this flow (R1 to R7) searches to see if there is a module that is already producing the string triggered this time among the sound source modules of the musical tone generation circuit 60, and if there is, the sound source module is searched for. This is where the module is muted, and the second half of this flow (R8 to R18) is to find the sound source module (an empty sound source module) for producing the musical tone of the string that was triggered this time, and to mute that sound source module. This is the part that starts producing musical tones.

First, in the first process R1, 1 is written into the sound source module number register D-RG. In other words, sound source module No. 1 is specified. Processing R
In step 2, the contents of string designation register a of the sound source module control registers corresponding to the value of D-RG are loaded. In other words, the string number being sounded by the specified sound source module is read. Then, the value of the register B-RG indicating the number of the string triggered this time and the string number of the sound source module are compared in the determination process R3. When compared, if they are not equal, the sound source module in question is not producing the string that was triggered this time. In other words, it is either producing notes from other strings, or it is empty. In this case, in process R4, D-
Add 1 to the value of RG, that is, specify the next numbered sound source module, and in judgment R5, the value of D-RG becomes 9.
It is determined whether the number is 8 or less, and if it is 8 or less, the loop from process R2 is repeated.

In determination R3, B-RG may be equal to string No. (a). This indicates that the sound source module of interest is already generating the string that was triggered this time. Therefore, the next process R6
Then, the sound source module is muted, and zero is placed in register a of the control register for the sound source module to remember that the sound source module is empty (that it is not producing sound). Then, in the next process R7, register
Write the value of register D-RG, that is, the muted sound source module number, to LASTMD. register
LASTMD is a register that controls the assignment of sound source modules, and the value of LASTMD (i.e., the sound source module number to which the sound was assigned most recently).
(See processes R16 and R17) or the sound source module number next to the sound source module number that was immediately muted) is used to start a search for assignment of pronunciation.

In the first process R8 in the second half of the flow, the value of LASTMD is entered into the sound source number register D-RG, and 1 is written into the loop number register E-RG. First process R9 of the loop (processes R9 to R15), determination R
10. In process R11, calculate the number of the next sound source module to be tested and store it in the sound source number register D.
- Load the contents of register a of the control register of the sound source module with R12 written to RG,
In determination R13, it is determined whether or not the a register is zero, that is, whether or not the sound source module related to the test is generating sound (in use). If sound is being generated, the loop count register E-RG is advanced by one in process R14, and judgment is made in R15.
It is checked whether the value of E-RG is 8 or less, and as long as it is 8 or less, the loop from process R9 is repeated. In addition, if the value of E-RG is 9 or more in this judgment R15, it is 8.
This means that all two sound source modules are currently sounding, which logically cannot happen.
Since the memory has been corrupted due to some external factor, appropriate error handling is performed in process R18.

On the other hand, if it is determined in determination R13 on the loop that the sound source module related to the test is not producing sound, the process branches to process R16, and the register P is set for that sound source module (module corresponding to the value of D-RG). Instructs the start of musical tones according to the pitch data of the string triggered this time, which is the content of -RG, and sets the value of B-RG, that is, the pitch data of the string triggered this time, to register a of the control register of the sound source module. The string number is written, the value of C-RG, that is, pitch data, is written into register b, and a predetermined value (sounding time data) is written into counter c. Finally, in process 17, register
Write the value of D-RG, that is, the number of the sound source module that has been turned on, into LASTMD.

<Review of musical tone lingering function> In the explanation so far, this embodiment has been described as using the musical tone lingering function, that is, when the same string 4 is played continuously,
It has become clear that the instrument has a function in which musical tones produced by subsequent string triggers begin to be produced while the lingering sound of the previous string trigger remains.

For example, when a certain string 4 is triggered for the first time,
This is detected in the flow of the trigger detection process in FIG. 13, and the second half (process R
8 to R18), the sound source module is assigned and generated, and it is stored that the sound source module is currently generating the triggered string.

If the same string 4 is triggered again under such conditions, this fact (that a specific string has been triggered) is detected in the same way. However, instead of simply passing through the first half of the flow of the assignment and sound generation process (Figure 16), the sound of the triggered string is "already" performed in a specific sound source module in the musical tone generation circuit 60 (Figure 5). It is confirmed that the sound source module is the same (determination R3), and a muting process is executed for that sound source module (process R6). Then, in the second half of the flow, a new sound source module is assigned to sound the string that was triggered this time,
A sound generation process is executed for the sound source module (process R16).

Here, the sound source module that is muted and the sound source module that is emitted are generally different. In particular, in the flow shown in Fig. 16, the search for the sound source module to be generated after the off-processed sound source module is started, and the first empty (a=
0) The sound source module is a sound source module that generates sound from a newly triggered string. In other words, it is ensured that the sound source module that should be sounded is found before reaching the off-processed sound source module (see LASTMD movement). However,
In the case of very exceptional string operations (e.g. all strings 4
(Strumming very fast), the sound source module that is being turned off and trying to produce a lingering sound may be immediately switched to the sound source module due to the sound assignment of a series of string triggers. However, as a practical matter, this does not matter. In other words, the processing shown in FIGS. 13 and 16 is such that when the same string is played continuously, the sound source module that is turned on is turned off, subject to the limited number of sound source modules. The sound source module is optimized to be as different from the sound source module as possible.

In short, in this example, a certain string is triggered, and while the musical tone of that string is being produced,
If the same string is triggered, the sound source module that is sounding that string will be muted, and
In response to the new string trigger, another sound source module is assigned to begin producing musical notes. Therefore, the musical tone lingering function described in FIG. 8 is fulfilled.

A variation is to assign two (or more) sound source modules to each string, turn on one of the two sound source modules with the first string trigger, and turn off the other sound source module with the second string trigger. However, the remaining sound source modules may be turned on.

Alternatively, the sound generation assignment to the tone source module may be prohibited until the tone source module that has been turned off has completely muted its musical tones. However, the number of sound sources to which sound generation can be assigned is reduced by this prohibition, so the total number of sound sources becomes large.

Furthermore, if the tone is an attenuated tone such as a guitar tone, the off process R6 shown in FIG. 16 may be omitted. In the case of an instrument that uses both a decay tone system and a sustained tone system, for example, the first
The determination may be made in the next step after determination R3 in FIG. 6, and if the tone is a sustained tone, the off process R6 is performed, and if the tone is attenuated, the off process may be omitted.

Sound generation time control As mentioned above, when a string is triggered, this is detected by the microcomputer 30 (Fig. 5), and in the flow of assignment and sound generation processing shown in Fig. 16, a musical sound is generated for that string. circuit 60
An empty sound source module is found from among the sound source modules (FIG. 5), and the ON process R16 is performed for that sound source module. and,
In this ON process R16, the sound generation time data is written into the counter c (FIG. 15) of the control register of the sound source module.

In this example, this sound generation time data is determined for each tone, and the tone select switch 5a (Fig. 2)
When a timbre is specified by , sounding time data of a length corresponding to the specified timbre is set in the ONTIME register (see FIG. 18, details will be described later). In other words, what is set in the counter c in the ON process R16 in the flow of FIG. 16 described above is exactly the sound generation time data determined by the currently selected tone. Then, the microcomputer 30 uses the sound generation time data thus set in the counter c in an interrupt routine (the flow of the time elapsed mute processing shown in FIG. 18) that interrupts every predetermined time interval. Subtraction is performed each time the counter c underflows, and when the counter c underflows, the corresponding sound source module is muted.

This will be explained in detail below. FIG. 17 is a detailed flowchart of the tone color designation change process performed as part of the panel switch state change process G8 shown in FIG.
First, in determination S1, tone select switch group 5
In a (Fig. 2), it is determined whether a new tone color has been specified, and if not, other processing S2 is performed, but if a new tone color has been specified, the process proceeds to step S3, and the tone data related to the specification is stored. Set. Furthermore, in the next process S4, the sound generation time data corresponding to the specified tone color is saved in the ONTIME register.

FIG. 18 is a detailed flowchart of the time-lapse muting process, and the microcomputer 30 executes the illustrated interrupt routine at every predetermined time interval. First, in process T1, registers and the like are saved in the same way as in a normal interrupt routine. In process T2, a register D-RG indicating the sound source module number is initialized to 1, and thereafter, loops T3 to T9 are executed.

In the first process T3 of the loop, the contents of register a of the sound source module to be tested (when a=0 indicates that it is not in use; when a≠0 indicates that the a-th string is generating sound) is loaded. . Then, in determination T4, it is determined whether or not a≠0, that is, whether or not the sound source module is generating sound. If the sound source module is generating sound, in process T5, the counter c for controlling the sound source module is subtracted, and in determination T6, that counter is When a borrow occurs, the sound source module is muted in process T7, and the register a is set to zero to remember that the sound source module is no longer generating sound. After processing T7, or when the sound is not being generated at determination T4, or when no borrow is produced at determination T6, the process advances to processing T8, where the sound source module number register D-RG is incremented by 1, and at determination T9, D-
It is determined whether the value of RG is 8 or less, and if it is 8 or less, the loop from process T3 is repeated.

After the loop processing is completed, the registers and the like are restored as in the case of the completion of normal interrupt processing (processing T10).

From the above description, it has become clear that this embodiment has a function of automatically muting the sound source module after the sound generation time has elapsed. The above sounding time data is prepared separately from the envelope data included in the tone data, and even if the musical sound envelope is being generated, that is, the sound source module is producing sound, when the time specified by the sounding time data has elapsed, The sound source module is instructed to mute the sound.

As a modification, the user may be able to freely program (change) the sound generation time data, thereby making it possible to obtain a different tone color.

Fret state change processing (FIGS. 19 and 20) Next, the fret state change processing executed by the microcomputer 30 (FIG. 5) at step G5 of the general flow (FIG. 6) will be described.

FIG. 19 is a detailed flowchart of the fret state change process. In the first process U1, the microcomputer 30 initializes the string number register B-RG to 1, and thereafter repeats the loop process from U2 to U6.

In the first determination U2 of the loop processing, it is determined whether there is a fret change. This can be done by comparing the previous sample value and the current sample value of the fret switch group belonging to the string indicated by the string number designation register B-RG. This fret change also includes a change to what is called an open string (open fret). If there is a change, the pitch data related to the fret position to be changed is written in the pitch specification register C-RG in process U3, and the frequency change process ( 20, details of which will be discussed shortly). If there is no fret change in determination U2, or after frequency change processing U5, in processing U5, add 1 to the string number designation register B-RG to set the string number to 1.
Advance one step. Then, in determination U6, it is determined whether the value of B-RG is 6 or less, and as long as it is 6 or less, the loop from determination U2 is repeated.

When the fret change processing for all strings is completed, the value of B-RG becomes 7 at determination U6, and the flow of the fret state change processing is exited.

FIG. 20 is a detailed flowchart of the frequency change process described above. At the time of entering this flow, the pitch specification register C-RG contains the pitch data of the fret that has changed, and the string number specification register B-RG indicates which string's fret has changed. Contains the value (string number).

First, in process V1, the sound source module number register D
- Initialize RG to 1. In process 2, register D-
Sound source module control register (first
Load register a in Figure 5), and at check V3, load the value of loaded register a and string number specification register B.
- Determine if the value of RG is equal. In other words, it checks whether the string whose fret position has changed is producing sound. Here, when there is a mismatch,
In processing V10, add 1 to the value of D-RG, advance the number of the sound source module to be tested by one, and perform judgment V11.
, determine whether the value of D-RG is 8 or less, and
In the following cases, repeat the loop from process V2,
When it reaches 9, it ends.

The case in which D-RG becomes 9 in determination V11 and the process is completed is as follows. In other words, this is the case when there is a change in the fret of the muted string. In the case of this kind of fret change operation, it is considered invalid,
No musical processing is performed.

On the other hand, if there is a change in the fret of a string that is currently sounding, a sound source module that is sounding that string exists, and this is stored in register a of the corresponding sound source module control register ( (See Figures 13 and 16). Therefore, D-
When RG indicates a certain sound source module number, at determination V3, a register = B-RG
holds true.

In this way, if it is determined in determination V3 that the string whose fret position has changed is currently sounding, then in the subsequent determination V4, the pitch specification register C-RG
By determining the value of , it is determined whether the fret change is a change to an open string. Here, if the change is not to an open string (in the case of a fret change)
Proceeds to processing V9, where the frequency is changed to the frequency corresponding to the pitch data indicated by the pitch specification register C-RG for the sound source module (determined from the value of D-RG) that is producing sound for that string. At the same time, the value of pitch designation register C-RG is written to register b. In this processing V9, only the frequency is changed as musical tone processing, and no muting or new sounding processing is performed. As a result, the frequency of the musical tone changes while maintaining smoothness without attack (see Figure 1).

On the other hand, when it is determined in determination V4 that the fret state has changed to an open string state, the process proceeds to determination V5, and the off-string-off processing execution flag OFFFG is set to 1.
(set), and if it is 1, process V
At step 8, off processing is executed. In other words, while muting the sound source module that is producing the string,
A zero indicating that the sound source module is not in use is written in register a in the control registers of the sound source module.

If flag OFFFG is reset in determination V5, register b is loaded in process V6.
The value in register b corresponds to the pitch of the previous fret state. At determination V7, this register b
Based on the value of , it is determined whether the previous pitch data corresponds to the first fret or the second fret,
If YES, perform frequency execution processing in process V9,
finish. In addition, the reason for adding discrimination V7 is
In this example, we mainly consider the sliding playing method of the same string, so when the string changes to an open string after the third fret, the player has to hold down the string in order to play a melody using multiple strings. This is because it was assumed that the finger that had been pressed was released and the finger moved to a different string.

Now, the string-off processing execution flag OFFFG shown in determination V15 in FIG. 20 is set to the string-off mode changeover switch 5c (see FIG.
It can be controlled by

Flag for mode changeover switch input when strings are removed
FIG. 21 shows a flowchart of the OFFFG switching process. This flow is performed as part of the panel switch state change processing G8 in the general flow of FIG.

First, in the determination W1, the mode changeover switch W
Determine whether 1 is pressed. If it has not been pressed, the process proceeds to other processing W2, but if it has been pressed, it is determined in determination W3 whether the string-off silencing mode has been turned on or turned off. If it is on, in process W4, turn off processing execution flag OFFFG when string is removed.
Set the flag to 1, and set the flag OFFFG to 0 if it is off.

<Review of open string silencing, frequency change function, and selection function> In the explanation so far, this embodiment has a smooth frequency change function (see Figure 1 A to C), and a silencing function by open string change (Figure 1 N). It has become clear that it has a selection function (see Figure 1).

First, regarding the smooth frequency change function, the microcomputer 30 assigns and sounds a sound source module in the sound generation/assignment process using a string trigger (Figures 13 and 16), and determines which string the sound source module will sound on. The sound source control information, such as whether the sound is being played or not, is entered in the sound source control register (FIG. 15). If the fret position of the string changes while the string is producing sound, the microcomputer 30 detects this (which string has changed to which fret position) through the process shown in FIG. Then, in the process shown in Fig. 20, the sound source module that produces the sound for that string is searched,
Processing is performed to change only the frequency of the found sound source module. Therefore, the first
The functions described in the figure are realized.

The frequency change function of this example is a function for changing the fret position for the same string during sound generation. In other words, this is a function performed when fingering is performed on one string. For example, the same performance effect can be obtained by using a playing method similar to the sliding playing method seen on an acoustic guitar, or the fingering method of fast phrases on the same string (both of which are played only once for the first time). Can be done.

In addition, in order to realize a silencing function by changing open strings,
The microcomputer 30 secures in the pitch designation register C-RG and the string number designation register B-RG through the process shown in FIG. 19 that the fret position of the string being sounded has changed to the open string state, Through this process, the sound source module that is generating the string is found, and by checking the value of the pitch specification register C-RG, it is confirmed that the string has changed to an open string. And in this case the flag
As long as OFFFG is set, the sound source module it finds is muted.

Therefore, the open string silencing function described in FIG. 1 is exactly realized. The open string silencing function of this example is particularly advantageous in situations where note-off conditions cannot be easily obtained from a switch such as the string trigger switch TSW (Fig. 4). By removing your finger from the string at the desired timing, you can freely control the duration of the string's sound. Furthermore, this mute function is also suitable for playing a melody using multiple strings in sequence. Another advantage is that no extra switch is required for note-off.

Further, in this example, a selection function is provided that allows a frequency change function suitable for a sliding playing style to be given priority over the above-mentioned open string silencing function. That is, a switch 5b for changing the silencing mode when the strings are taken off is provided on the main body of the instrument for convenience for the player.

Mew switch processing (Figs. 22 and 23) Next, the mew switch processing (Fig. 22) that the microcomputer 30 (Fig. 5) executes as part of the panel switch state change processing G8 of the general flow (Fig. 6). ) will be explained.

This mute function is activated when the mute switch 5b (Fig. 2) provided on the main body of the instrument is pressed.
In response, this function quickly mutes all sound source modules that are generating musical tones at the same time.

To be more specific, in the first determination X1 of the flow shown in FIG.
determines whether or not the miyute switch 5b has been pressed. If it has not been pressed, another panel switch state change process indicated by process X2 is executed, but if it has been pressed, all sound sources are muted in process X3.

The details of this all sound source muting process are as shown in FIG. 23. In the first process Y1, a value of 1 is put into the sound source module number register D-RG to initialize the sound source module number. Loop processing from Y2 to Y7 is performed on the sound source module indicated by the value.

That is, in the first step Y2 of the loop processing, register a of the registers (sound source control registers shown in FIG. 6) for controlling the sound source module designated by D-RG is loaded. As mentioned above, when register a has a value of zero, it indicates that the corresponding sound source module is not being used (not producing sound), and when it has a value other than zero, it indicates that the musical tone of the string indicated by that value is corresponding. It has come to mean that the sound source module is pronunciation. Therefore, in the next determination Y3, register a
By determining whether or not the value of is zero, it is checked whether the sound source module of interest is currently producing sound. If the sound is being generated, a high-speed mute process is executed on the sound source module (the sound source module indicated by the value of D-RG) in process Y4, and zero is written to the a register in the next process Y5. It remembers that the sound source module is empty. Following this process Y5, or when the sound source module is not producing sound at determination Y3,
In process Y6, the value of D-RG is incremented by 1, and the sound source module of interest is advanced to the next sound source module. Then, in determination Y7, D-
By determining whether RG is 8 or less, it is determined whether processing has been completed for all eight sound source modules included in the musical tone generating circuit 60 (FIG. 5). When D-RG is 8 or less, there are sound source modules that have not been tested yet, so the loop from process Y2 is repeated, and when D-RG reaches 9, all sound source modules have been tested, so the process ends. .

From the explanation so far, it is clear that this embodiment realizes the mute function described in FIG. 10. The high-speed mute process differs from the normal OFF process in that musical tones are attenuated more rapidly.

This function enables cutting techniques such as those used on acoustic guitars.

In addition, in this example, a single miyute switch 5b
In response to this operation, all currently sounding strings are rapidly muted, but other variations are possible. In other words, there may be more than one Myuto switch, and it is not necessary to perform high-speed muting on all strings that are currently sounding, but on one or more selected strings (more precisely, the sound source that is producing those strings). It may also be done against.

[Effects of the invention] As explained above in detail, according to the invention of the present application, the string vibration detection means detects the vibration of the string in a state where the open string operation state is detected by the open string operation detection means. is detected, in response, a musical tone having an open string pitch corresponding to the open string operation state is generated, and on the other hand, the fingering operation position is detected by the fingering operation position detection means. When vibration of the string is detected, a configuration is adopted in which, in response, an instruction is given to generate a musical tone having a pitch corresponding to the fingering operation position. In addition, if the determining means determines that the fingering operation position has shifted to the open string operation state while a predetermined musical tone is being generated, in response to this, the generating musical tone is muted. On the other hand, if it is determined that the fingering operation position has shifted to another fingering operation position other than the fingering operation position, in response to this, the musical tone being generated continues to be played. The configuration is such that the pitch is controlled to change from the pitch corresponding to the fingering operation position to the pitch corresponding to the other fingering operation position while the sound is being generated.

Therefore, according to the present invention, as in the case of traditional natural stringed instruments, if the string starts vibrating under the operating condition of the open string, the open string pitch corresponding to the operating condition of the open string will be changed. On the other hand, if the string begins to vibrate while a fingering operation is being performed, a musical tone with a pitch corresponding to the position where the fingering operation is being performed can be generated. It can generate musical sounds. In addition, if the fingering operation position changes to the open string operation state while a predetermined musical tone is being generated, in response to this, the vibration of the vibrating string is immediately suppressed. , it is possible to perform a mute process on the musical tone that is being generated, and similarly, if the fingering operation position moves from the fingering operation position to another fingering operation position while a predetermined musical tone is being generated, the mute processing can be performed in response to this. , the pitch corresponding to the other fingering operation position is changed to the pitch corresponding to the other fingering operation position while the musical sound being generated continues to be generated (that is, without performing a silencing process). can do.

[Brief explanation of the drawing]

Fig. 1 is a diagram suitable for understanding this invention, Fig. 2 is an overall perspective view of an electronic stringed instrument according to an embodiment of this invention, Fig. 3 is a sectional view taken along the - line showing an example of the configuration of a frett switch, and Fig. 4. Figure 5 shows an example of the configuration of a string trigger switch. Figure 5 is a diagram showing the overall circuit configuration. Figure 6 is a diagram showing the general flow of a microcomputer. Figure 7 is suitable for understanding the string trigger detection function. Figure 8 is a diagram suitable for understanding the lingering function of strings, Figure 9 is a diagram suitable for understanding the silencing function due to the passage of sound time, Figure 10 is a diagram suitable for understanding the miute function, Figure 11 is a diagram showing an example of the configuration of a latch circuit, Figure 12 is a diagram showing registers related to string trigger detection, Figure 13 is a detailed flowchart of string trigger detection processing, and Figure 14 is related to resetting the latch circuit. Flowchart of the interrupt routine; FIG. 15 is a diagram showing the sound source control register; FIG. 16 is a detailed flowchart of the assignment/sound generation process in FIG. 13; FIG. 17 is a flowchart of setting the sound generation time; FIG. 18 Figure 19 is a flowchart of an interrupt routine related to sound generation time control, Figure 19 is a detailed flowchart of fret state detection processing, Figure 20 is a detailed flowchart of frequency change processing in Figure 19, and Figure 21 is a detailed flowchart of frequency change processing in Figure 19. FIG. 22 is a flowchart for inputting the mode changeover switch when strings are removed, FIG. 22 is a flowchart for inputting the mute switch, and FIG. 23 is a detailed flowchart for silencing all sound sources in FIG. 22. 1...Body part, 4...Strings, 5c...Mode changeover switch when stringing off, 8...Finger board, 30...
...Microcomputer, 60...Musical sound generation circuit, TSW...String trigger switch, FSW...Fretswitch.

Claims (1)

[Claims for Utility Model Registration] A stringed instrument body having a finger board on which fingering operations are performed, at least one string stretched over the stringed instrument body, and string vibration detection means for detecting vibrations of the string. and a fingering operation position detecting means for detecting a fingering operation position performed on the fingerboard; and an open string detecting means for detecting an operation state of an open string on which no fingering operation is performed on the fingerboard. operation detection means, and in a state where the operation state of the open string is detected by the open string operation detection means, when vibration of the string is detected by the string vibration detection means, in response to the vibration of the string, instructing to generate a musical tone having an open string pitch corresponding to the operating state of the open string, and while the fingering operating position is being detected by the fingering operating position detecting means; When vibration of the string is detected, a musical sound generation instruction means for instructing to generate a musical sound having a pitch corresponding to the fingering operation position in response to the vibration detected by the fingering operation position detection means; From the fingering operating position,
Discrimination means for determining whether the fingering operation position has shifted to another fingering operation position other than the fingering operation position, or whether the fingering operation position has shifted to the open string operation position; and an instruction of the musical sound generation instruction means. Accordingly, while generating a musical tone having a pitch corresponding to the fingering operation position detected by the fingering operation position detection means, the discrimination means determines the operation state of the open string from the fingering operation position. If it is determined that the musical tone has shifted to the previous one, in response to this, the musical tone being generated is controlled to be muted;
On the other hand, if the determining means determines that the fingering operation position has shifted to the other fingering operation position, in response to this, the musical tone that is being generated continues to be generated; An electronic stringed instrument comprising: a control means for controlling the pitch to change from the pitch corresponding to the fingering operation position to the pitch corresponding to the other fingering operation position.