JPH0643865A - Electronic stringed instrument - Google Patents

Abstract

PURPOSE:To provide the electronic stringed instrument which gives an effect only with string touch operation without an influence upon the performance operation, the performance technique, and the performance form. CONSTITUTION:If the discrimination result in a step SA30 is negative, it is detected that a pertinent string is touched in the down direction, and the algorithm and the coefficient on the down side of the data area designated by a program switch and string NO.n are transferred to a DSP in this case (step SA31). If it is positive, it is detected that the pertinent string is touched in the up direction, and those on the up side of the data area designated by the program switch and string NO.n are transferred to the DSP in this case (step SA33). Consequently, the DSP executes the effect processing in accordance with transferred algorithm and coefficient on the down or up side, thereby giving the effect different by string touch to the down side and that to the up side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic stringed instrument having an effect control function.

[0002]

2. Description of the Related Art Conventionally, as an electronic stringed instrument having an effect control function, an effect processing is performed on an electric signal output from a pickup of an electronic guitar according to an operation of a tremolo arm provided on a guitar body,
Alternatively, it is generally known that an effect process is applied to the electric signal according to the operation of a foot pedal having a switch function. Further, for example, Japanese Patent Laid-Open No. 1-24
As disclosed in Japanese Patent No. 3096, an angle sensor is attached to a head of a guitar body, and effect processing is performed by controlling a delay time according to an inclination angle from a state where the guitar body is horizontal with respect to the ground. It has come to be proposed what to give.

[0003]

However, in the case where the effect processing is performed in accordance with the operation of the tremolo arm, the string must be momentarily interrupted when the tremolo arm is operated, and the performance operation is not performed. Hinders On the other hand, in the case where the effect processing is performed according to the operation of the foot pedal, it is not necessary to interrupt the string, so that the performance operation itself can be continuously performed. However, in a guitar performance in which one hand holds a string while the other hand plays a string, an additional foot operation hinders the player from concentrating on the playing operation, which affects the playing technique.

Further, in an instrument such as an electronic guitar that is carried and played, the angle of the guitar body carried by the performer is different. Therefore, for some guitars that perform effect processing according to the tilt angle of the guitar,
Depending on the performer, without changing the angle of the guitar body,
Effect processing starts when you take the basic posture,
Useless effects are added, which hinders the free expression of performance. In addition, during performance, it is general that the guitar player unconsciously plays the body, such as moving the body in accordance with the rhythm or vibrating the guitar body in accordance with the performance operation. Therefore, when the effect processing is started according to the tilt angle of the guitar body, it is necessary to move the body and change the tilt angle of the guitar body while being aware of the start of the effect processing. This will interfere with the performance operation at.

The present invention has been made in view of such conventional problems, and provides an electronic stringed instrument capable of effect control only by a string operation without affecting a performance operation, a performance technique, and a performance form. It is intended to be provided.

[0006]

In order to solve the above-mentioned problems, the present invention provides a string vibrating by a string operation, and a converting means for detecting the vibration of the string and converting it into an electric signal.
Effect means for performing effect processing on the electric signal converted by the converting means, string direction detecting means for detecting the string direction of the string, and string direction detected by the string direction detecting means. And an effect control means for controlling the processing operation of the effect means. Further, the effect means is configured to execute arithmetic processing based on a preset algorithm and coefficient for an input electric signal, or change the algorithm and coefficient based on the string direction. Is configured.

[0007]

In the above construction, when the performer operates the string, the string vibrates, and the vibration of the string is converted into an electric signal by the converting means. On the other hand, the string direction detecting means detects the string direction when the performer plays the string, and the effect control means controls the effect means based on the string direction detected by the string direction detecting means. Thereby, the effect means performs the effect processing on the signal according to the control operation of the effect control means, and accordingly, depending on the string direction of the performer,
Different effect processing is applied to the electric signal. More specifically, the effect means executes arithmetic processing based on a preset algorithm and coefficient according to the string direction, and the effect control means changes this algorithm and coefficient based on the string direction. By doing so, effect processing according to the string direction is performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. That is, this embodiment applies the present invention to an electronic guitar, and as shown in FIG.
Is composed of a body 2, a neck 3 having one end fixed to the body 2, and a head 4 provided at the other end of the neck 3. The head 4 has a conductive first
One ends of the six strings 5-1 to 5-6 from the strings to the sixth string are locked, and the other ends of the strings 5-1 to 5-6 are the body 2
It is locked to the tremolo unit 6 attached to the.

A pickup device 7 is mounted on the body 2 just below the strings 5-1 to 5-6. As shown in FIG.
Six pairs of lower pickups 7a and upper pickups 7b, which are arranged so as to sandwich -1 to 5-6, are provided, and a total of 12 pickups are configured. The pickups 7a and 7b have the same structure, and as shown in FIGS. 4 and 5, (A), the resin bobbin 9 around which the coil 8 is wound and the central portion of the bobbin 9 are fitted and inserted. The core 10 is made of a magnet and has an upper end protruding. Therefore, the string 5 is in the DOWN direction ((B) of FIG. 4)
, And in the UP direction ((B) of FIG. 5), both pickups 7a and 7b output voltages that change in opposite phases.

At this time, when the string 5 is stationary as shown in FIG. 4A, both pickups 7a and 7b are placed.
Is 0, and when the string 5 is played in the DOWN direction as shown in (B) of the figure, the string 5 arrives on the lower pickup 7a, and the output of the lower pickup 7a. The voltage rises sharply. Therefore, when the output voltage from the upper pickup 7b is 0 and the output voltage from the lower pickup 7a rapidly rises, it is possible to detect that the string 5 is tuned in the DOWN direction.

Further, as shown in FIG. 5A, when the string 5 is stationary, both pickups 7 are operated as described above.
The outputs from a and 7b are 0. When the string 5 is plucked in the UP direction as shown in (B) of the figure, the string 5 arrives on the upper pickup 7b, 7
The output voltage of b suddenly rises. Therefore, when the output voltage from the lower pickup 7a is 0 and the output voltage from the upper pickup 7b rapidly rises, it is possible to detect that the string 5 is tuned in the UP direction. In addition, in this embodiment, as shown in FIG. 3, the lower pickup 7 corresponding to the first string 5-1 is used.
a is the first string and the upper pickup 7b corresponding to the sixth string 5-6 is the 12th string, and the first to sixth strings 5-1 to 5-
It is assumed that the lower pickup 7a and the upper pickup 7b provided corresponding to No. 6 are sequentially treated as the 1st to 12th pickups.

Further, the body 2 has an operation display panel section 1
1 is provided, and the operation display panel section 11 has various switches and a display section shown in FIG. That is, the operation display panel unit 11 includes program switches 12a and 12b, a mode switch 13, a rotary string NO. Switch 14, an UP switch 15a and a DOW.
Picking direction setting switch including N switch 15b, WRITE switch 16, cursor keys 17a, 1
7b, VALUE switch 18, etc. are provided. Further, an LED 19 is arranged near the mode switch 13, and a display unit 20 composed of an LCD is provided near the cursor keys 17a and 17b.

The mode switch 13 is set to the mode 1 (edit mode) by operating it on the EDIT side when setting parameters, and the EFECT S
By operating to the TART side, the mode 2 (performance mode) is set. And in this mode 2 state,
As will be described later, the tone color sets (PATCH) stored in advance in the RAM can be sequentially called by operating the program switches 12a and 12b. At this time, as shown in the figure, P of the set of recalled tones is
ATCH NO. And TYPE, and parameters P1 and P
2, P3 ... are displayed on the display unit 2 for each of the UP side and the DOWN side.
Displayed at 0.

In the state of the mode 1, after selecting one of the string numbers 1 to 6 to be reset by operating the string number switch 14, the picking direction is changed by operating the UP switch 15a or the down switch 15b. decide.
By this determination of the picking direction, for example, when the UP switch 15a is operated, the cursor C is displayed on the UP side of the display unit 20 as illustrated. This cursor C
Can be moved by operating the cursor keys 17a and 17b, and the cursor C is moved to the algorithm (TYPE).
Alternatively, by moving to one of the parameters P1, P2, P3 ... And operating the VALUE switch 18, the corresponding algorithm and parameters P1, P2, P3.
You can change the value of. And finally WRIT
By operating the E switch 16, the corresponding algorithm and the values of the parameters P1, P2, P3 ...
The value changed by the operation of the ALUE switch 18 can be rewritten.

FIG. 1 is a block diagram showing the overall structure of the electronic guitar according to this embodiment. The CPU 21 constitutes a program previously stored in a ROM 22 for the program and effect data written in the RAM 3. DS based on data such as algorithms and parameters
P24 and the display unit 20 are controlled, and all the processes necessary for this electronic guitar are performed. The pickup group 25 includes 6 pickups provided in the pickup device 7.
The pickups 7a and 7b are included in a set, and the vibrations of the corresponding strings 5-1 to 5-6 are converted into electric signals and output from the pickups 7a and 7b. This electrical signal is A
It is input to the CPU 21 and the DSP 24 via the / D converter 26 and the data bus, and is also input to the envelope extraction circuit group 27.

The envelope extraction circuit group 27 corresponds to the first to twelfth pickups shown in FIG.
It is composed of two envelope extraction circuits, and individually extracts the envelopes of the electric signals output from the pickups 7a and 7b and outputs them to the CPU 21 via the A / D converter 28 and the data bus. The SW group 29 is composed of various switches provided on the operation display panel unit 11 described above with reference to FIG. 6, and operation information of these switches is input to the CPU 21 via the data bus. The CPU 21 controls the DSP 24 based on the operation information from the SW group 29 and the envelopes of the pickups 7a and 7b input from the envelope extraction circuit group 27 via the A / D converter 28. DSP24 is A / from the pickup group 25
With respect to the electric signal input via the D converter 26, C
The effect processing is performed by executing the arithmetic processing based on the algorithm and the coefficient set by the instruction from the PU 21. The signal subjected to this effect processing is generated into a sound signal by a sound generating circuit 30 including a D / A converter and an amplifier (not shown), and is output to a sound emitting means such as an external amplifier and a speaker.

Next, the operation of the present embodiment having the above configuration will be described with reference to the operation flow of the CPU 21 shown in FIGS. 7 to 10 and the operation flow of the DSP 24 shown in FIG. That is, by turning on a power switch (not shown), the CPU 21 starts the operation according to the flowcharts shown in FIGS. 7 to 10, and first executes the initialization process (SA1) to clear the registers and the like used in this flow. Further, the mode switch 13 is scanned (SA2) to determine whether or not the above-mentioned mode 1 is set (SA3), and when the mode 1 (edit mode) is set, the LED 19 is turned on. Then, it is displayed (SA4) that mode 1 is set.

Subsequently, the program switch 12
a, 12b are scanned (SA5), and by scanning the program switches 12a, 12b, it becomes clear which data the performer has selected. Therefore, in the next step, data corresponding to the states of the program switches 12a and 12b stored in the RAM 23, that is, effect data selected by the performer operating the program switches 12a and 12b is designated (SA
6).

Further, the string No. switch 14 is scanned (SA7), and by scanning the string No. switch 14, it becomes clear which string No. data the player has selected. Therefore, in the next step, the above-mentioned SA6
The data designated by the string No. switch 14 in the data designated by the program switches 12a and 12b is read by the process of (S8), and the data designated by the string No. switch 14 read by this SA8 is displayed on the display unit. 20
Is displayed on the screen (SA9). As a result, for example, as shown in FIG. 6, the performer switches the program switches 12a and 12b.
Data (PATCH) 1 is selected by the operation of, and
When the string No. 2 is selected by operating the string No. switch 14, the UP side data (TYPE) which is the data of the string No. 2 in the data (PATCH) 1 is displayed on the display unit 20.
, And the parameters P1, P2, P3 ...) And the DOWN side (TYPE and parameters P1, P2, P3 ...) Are displayed.

Next, it is determined whether or not the UP switch 15a is turned on (SA10). When the UP switch 15a is turned on, the cursor C and the VALUE switch 16 are used to correct the UP side algorithm and coefficient. Do (S
A11). That is, when the UP switch 15a is turned on, the cursor C is displayed on the UP side as illustrated in FIG. Then, in this state, the cursor key 17
Operate a, 17b to move the cursor C to TYPE, P1, P
After setting to 2, P3 ..., VALUE switch 1
By manipulating 6, the UP side algorithm and coefficients are modified. Also, this modified TYPE, P
1, P2, P3 ... Display content change processing (SA14)
Is displayed on the display unit 20, and the corrected algorithm and coefficient can be confirmed.

When the UP switch 15a is not turned on, it is judged whether or not the DOWN switch 15b is turned on (SA12). When the DOWN switch 15b is turned on, the cursor C, VAL
The UE switch 16 corrects the algorithm and coefficient on the DOWN side (SA13). As a result, the algorithm and coefficient on the DOWN side are modified in the same manner as described above, and the modified algorithm and coefficient are similarly displayed on the display unit 20 by the display content changing process (SA14). After executing this display content change processing (SA14), WRI
It is determined whether or not the TE switch 16 has been turned on (SA15 in FIG. 8). When the TE switch 16 has been turned on, the areas designated by the program switches 12a and 12b and the string No. switch 14 are rewritten (SA16), Then S
Return to A2.

Therefore, in the state where the mode 1 is set in this way, the program switches 12a and 12b are set.
To specify the data and the string NO. Switch 14 to specify the string NO., And then operate the UP switch 15a or the DOWN switch 15b to select either the UP side or the DOWN side. , VALUE switch 18 corrects the algorithm and coefficient, and finally operates the WRITE switch 16 so that among the data designated in advance by operating the program switches 12a and 12b,
By operating the string No. switch 14, the UP side or the DOWN side of the data of the specified string No. can be freely changed.

On the other hand, if mode 2 (performance mode) is set when the determination of SA3 in FIG. 7 is made, S
The process proceeds from SA3 to SA17 in FIG. 9 to turn off the LED 19 and display that mode 2 is set. Next, scan the program switches 12a and 12b (SA1
8) The operation state is detected, and the data in the RAM 23 is designated according to the detected state of the program switches 12a and 12b (SA19). Continuing, first to sixth
In order to detect the vibration state of the strings 5-1 to 5-6, first, the pointer n is reset to 0 (SA20), and then each string 5-1 to 5-5.
-6 Of trigger flag T ₁ through T ₆ provided corresponding to, T _n flag is determined whether or not the set state (SA21). This trigger flag T _n is a flag that is set in SA28 of FIG. 10 when a string is detected as described later, and if it is not set, it is 2n + 1.
Is set in the J register (SA22).

That is, n has an initial value of 0 by the processing of SA20 and 1 by the processing of SA35 shown in FIG.
2n + 1 is 1, 3, 5 ...
It becomes an odd value of, and this odd value is set to J. Therefore, in the next step SA23, the data from the J-th pickup is stored in the A1 register.
Only data from the odd-numbered pickups is stored in the A1 register. Further, by the processing of storing the data from the J + 1th pickup in the A2 register at SA24, only the data from the even pickup is stored in the A2 register. Therefore, by the processing of SA23 and SA24, the data from the lower pickup 7a (odd number) and the upper pickup 7b (even number) corresponding to the same string are stored in the A1 and A2 registers, respectively.

Subsequently, the envelope extraction circuit group 2
The data of the Jth envelope extraction circuit from 7 is B
The data is stored in the 1 register (SA25) and the data of the (J + 1) th envelope extraction circuit is stored in the B2 register (SA26 in FIG. 10). Therefore, this SA2
By the processing of 5 and SA26, the envelope data of the string vibration from the lower pickup 7a and the envelope data of the string vibration from the upper pickup 7b corresponding to the same string are respectively stored in the B1 and B2 registers.

Next, by determining whether the value of the B1 register or the value of the B2 register is larger than a predetermined value α (SA27), it is determined whether or not the nth string is struck. Then, when the value of the B1 register or the value of the B2 register is equal to or less than the predetermined value α and the nth string is not plucked, after incrementing n (SA35),
It is determined whether or not n has become 6 (SA36), and the determination processing from SA21 of FIG. 8 is repeated until n = 6.

On the other hand, in SA27, if the value of the B1 register or the value of the B2 register is larger than the predetermined value α, it means that the nth string has been plucked. The nth trigger flag T _n indicating that a string has been struck
Is set (SA28). After that, the value of A1-A2, that is, the lower pickup 7a and the upper pickup 7
The difference in output value from b is stored in the A3 register (SA2
9). Subsequently, it is determined whether or not the value stored in the A3 register is smaller than 0 (SA30), and if A3 <0 is not satisfied,
From the output value of the lower pickup 7a to the upper pickup 7
The value obtained by subtracting the output value of b is positive, which means that the output value of the lower pickup 7a is larger than the output value of the upper pickup 7b. As described with reference to FIG. 4, the string is tuned in the DOWN direction. It was done. Therefore, in this case, as described above, the program switches 12a, 12
The algorithm and coefficient on the DOWN side of the data area designated by b and the string NO.n are transferred to the DSP 24 (SA3
1), J + 1 is stored in the P _n register (SA32).

On the other hand, the determination result of SA30 is A3.
If <0, it means that the value obtained by subtracting the output value of the upper pickup 7b from the output value of the lower pickup 7a is negative, and the output value of the upper pickup 7b is larger than the output value of the lower pickup 7a. As described in Section 5, the string is plucked in the UP direction. Therefore, in this case, as described above, the program switch 1
2a, 12b and the algorithm and coefficient on the UP side of the data area designated by the string NO.n are transferred to the DSP 24 (S
A33) and J are stored in the P _n register (SA34).

In this way, after executing the processing of SA31, 32 or SA33, 34 according to the determination result of SA30, n is incremented as described above (SA3
5), it is determined whether n has become 6 (SA36), and n
The determination process from SA21 in FIG. 8 is repeated until = 6. Therefore, by the time SA20 sets the initial value 0 to 6 by the process of SA35, SA21 ...
The loop of SA36 will be repeated 6 times, and as a result, for the plucked string from the first string to the sixth string 5-1 to 5-6, the algorithm and the coefficient according to the plucking direction are sent to the DSP 24. Transferred.

Then, when n = 6, SA3 in FIG.
After returning to SA20 of FIG. 9 from 6 and resetting n to 0,
It is determined whether the Tn flag is in the set state (SA
21). _{If the} Tn flag is not in the set state,
If the T _n flag is in the set state by executing the above-described determination processing after SA22, the data from the P _n -th pickup is stored in the C register (SA37).

That is, the trigger flag T _n corresponding to the string No. of the string struck by the processing of SA28 described above.
No. _n strings are in a vibrating state if the flag T _n is in a set state. Further, the vibration of each string is detected by the lower pickup 7a and the upper pickup 7b, respectively, but since the string vibrations detected by both the pickups 7a and 7b have opposite phases, they are detected by both the pickups 7a and 7b. If both string vibration data are used, it becomes impossible to generate a musical sound. Therefore,
When a string is struck to the DOWN side, SAn is set in advance to P _n with J + 1, and the string vibration data from the upper pickup 7b of the P _n- th, that is, the even-numbered string is C at SA37. Store in register. Also, the string is U
When the string is struck on the P side, J is set in P _n in advance in SA34, and the string vibration data from the upper pickup 7a of the P _n- th, that is, the odd-numbered string is SA3.
It is stored in the C register at 7.

Next, it is determined whether or not C <α, that is, whether or not the string vibration data stored in the C register is smaller than a predetermined value α (SA38). Since the strings are in the attenuated state, the flag T _n indicating that the strings have been struck is reset (SA39), and then the process proceeds to SA35 in FIG. On the other hand, if C <α is not satisfied and the string is still in a vibrating state without being attenuated, the data n (data indicating the string NO.) And C
After transferring the contents of the register to the DSP (SA40),
Proceed to SA35 in FIG. Therefore, in mode 2 (playing mode), SA20 to SA40 described above are used.
Is repeatedly executed, the algorithm and coefficient (SA31, 33) on the DOWN side or the UP side of the data area designated by the program switches 12a and 12b and the string NO.n, and the contents of the data n and the C register (SA40) are sequentially transferred to the DSP 24.

On the other hand, the DSP 24, like the CPU 21, operates according to the flowchart shown in FIG. 11 when the power switch is turned on, and after first executing the initialization process (SB1), data (data n,
It is determined whether or not the contents of the C register) have been input (S
B2). If no data is input, it is determined whether or not an algorithm is input from the CPU 21 (SB
4) If there is no algorithm input, the process returns to SB2. That is, the DSP 24 receives SB2 → SB when neither data nor algorithm input is received from the CPU 21.
The standby state is maintained while repeating the loop of 4 → SB2.

Then, when data is input from the CPU 21 by the processing of SA40 in FIG. 8 described above, the process proceeds from SB2 to SB3, and the contents of the C register transferred based on the program and coefficient corresponding to the data n are subjected to effect processing ( SB3). Therefore, by the processing of SB3, C
The string vibration data from the P _n- th pickup, which is the content of the register, is subjected to an effect process based on the corresponding program and coefficient, and is output from the DSP 24 to the sound generation circuit 30. In addition, the above-mentioned SA31 or SA3 of FIG.
When the algorithm and the coefficient corresponding to the plucking direction are input from the CPU 21 by the processing of 3, the process proceeds from SB4 to SB5, the algorithm and the coefficient from the CPU 21 are rewritten, and the determination processing from the SB2 is repeated.

Therefore, the DSP 24 rewrites the algorithm and coefficient each time the processing of SA31 or SA33 of FIG. 10 is executed according to the string direction, and at the same time the processing of SA40 of FIG. 8 is executed and data is input. ,
Based on the coefficient previously rewritten according to the string direction, C
The string vibration data from the P _n- th pickup, which is the contents of the register, is subjected to effect processing and output to the sounding circuit 30. Therefore, by amplifying the signal input to the sound generation circuit 30 and outputting the sound from the speaker, the speaker produces a musical sound to which an effect is added according to the playing direction of UP or DOWN performed by the performer. .

That is, when the player makes a string in the UP direction or the DOWN direction in this way, an effect is added according to the string direction. Therefore, when the player adds an effect, the tremolo arm or There is no need to operate the foot pedal. Therefore, the performance is interrupted by the operation of the tremolo arm, and the operation of the foot pedal with the foot is not disturbed, so that the concentration of the performance operation is not hindered and the effect-added musical tone can be generated. Further, since it is not necessary to change the tilt angle of the guitar body 1, it is possible to perform a performance operation in a natural performance form, to move the body in accordance with the rhythm, or to vibrate the guitar body in accordance with the performance operation. It is possible to add effects while performing a performance operation in a natural performance mode such as performing.

[0037]

As described above, according to the present invention, the chord direction of a string is detected, and the effect control is performed based on the detected chord direction. Therefore, it is possible to add an effect only by the playing string, which is a performance operation, without the need to perform an operation other than the playing string, such as operation of the tremolo arm or footbedal, or change of the tilt angle of the guitar body. As a result, performance operation, performance technique,
It is possible to add effects freely without affecting the performance form. In addition, since different effects can be added by changing the string direction, it is possible to change the effect frequently, which was not possible by the operation of the tremolo arm etc. in the past. It is also possible to achieve

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of an electronic guitar according to an embodiment of the present invention.

FIG. 2 is an external view of the electronic guitar.

FIG. 3 is an enlarged view of a pickup device portion of the same embodiment.

FIG. 4 is a cross-sectional view showing a case where a string is in a DOWN direction.

FIG. 5 is a cross-sectional view showing a case where a string is in the UP direction.

FIG. 6 is an enlarged plan view of an operation display panel section of the electronic guitar.

FIG. 7 is a flowchart showing an operating procedure of the CPU of the embodiment.

FIG. 8 is a flowchart following FIG.

9 is a flowchart following that of FIG. 7. FIG.

10 is a flowchart following and of FIG.

FIG. 11 is a flowchart showing an operation procedure of the DSP of the embodiment.

[Explanation of symbols]

 1 Guitar body 5-1 ■ 5-6 String 7a Lower pickup 7b Upper pickup 11 Operation display panel 12a, 12b Program switch 13 Mode switch 14 String NO. Switch 15a UP switch 15b DOWN switch 16 WRITE switch 18 VALUE switch 21 CPU 22 ROM 23 RAM 24 DSP

Claims (3)

[Claims] 1. A string that vibrates by a string operation, a conversion unit that detects the vibration of the string and converts the string into an electric signal, and an effect unit that performs an effect process on the electric signal converted by the conversion unit. A string direction detecting means for detecting the string direction of the string, and an effect control means for controlling the processing operation of the effect means based on the string direction detected by the string direction detecting means. An electronic stringed instrument characterized by having. 2. The electronic string instrument according to claim 1, wherein the effect means executes arithmetic processing on an input electric signal based on a preset algorithm and coefficient. 3. The electronic string instrument according to claim 2, wherein the effect control means changes the algorithm and the coefficient based on the string direction.