JPH0658598B2 - Electronic stringed instrument - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an electronic stringed instrument, and more particularly to an electronic stringed instrument in which a string or fret is provided with a parameter setting function in addition to an original performance operation function.

BACKGROUND OF THE INVENTION Various types of guitar-type electronic string instruments have been developed in the past. As one of the techniques for making an input device for an electronic string instrument of this type multifunctional, parameters are set in addition to the original playing mode. It is considered that the parameter setting mode can be set to the fret or the string.

That is, when the normal playing mode is selected by the mode changeover switch, when the playing input operation is performed, the playing input signal, that is, the string number and the fret number obtained by the pitch extraction is used. When high data is obtained and given to the sound source device, a musical tone of a corresponding pitch is generated, and when the playing input is performed under the condition that the parameter setting mode is selected, a predetermined parameter is set. Select and set it as the sound source device.

However, in such an electronic stringed instrument, when the string is accidentally touched by a finger or the like and the string vibrates in the condition that the string is set in the parameter setting mode, the parameter is selected, or a plurality of strings are selected. There is a problem in that it vibrates at the same time and it becomes unclear which parameter corresponding to which string is selected and set.

[Object of the Invention] The present invention has been made in view of the above circumstances, and is intended to improve the operability at the time of parameter setting of an electronic stringed instrument of a type in which a string or fret is operated to set parameters. The purpose is to prevent a parameter other than the intended one from being selected and set when it is not intended.

[Summary of the Invention] That is, the present invention provides the following two inventions in order to achieve the above object.

According to the first invention and the second invention, the pitch is extracted from the vibration of the string, and in the parameter setting mode, the pitching operation of the predetermined string at the predetermined fret operation position is dealt with from the extracted pitch. Get parameters and set them.

The first aspect of the present invention is characterized in that when a plurality of string playing operations are detected in the parameter setting mode, the parameter setting operation of the parameter setting means is suppressed.

A second aspect of the invention is characterized in that, when a playing operation is performed in the open string state in the parameter setting mode, the parameter setting operation of the parameter setting means is suppressed.

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

★★ Configuration ★★ Fig. 1 shows the overall circuit configuration of the embodiment, showing the internal configuration of the body of a guitar-type electronic string instrument and the configuration of the external circuit connected thereto.

In the figure, reference numeral 1 denotes the pitch extracting circuit for the first string, and the second to sixth strings are exactly the same, so only the pitch extracting circuit 1 for the first string is shown in the drawing.

Reference numeral 11 is a pickup, which converts the vibration of the first string into an electric signal. That is, in this embodiment, the independent pickup is provided for each of the six strings. Then, the output of the pickup 11 is applied to the filter 12 (low-pass filter) so that the higher-order overtone signal is removed. It is desirable that the cutoff frequency of the filter 12 be set to be different for each string in accordance with the range of the vibration frequency being different for each string.

The output of the filter 12 is given to the filter amplifier 13, and further appropriately filtered and amplified,
It is given to the zero-cross comparator 14.

The details of the zero-cross comparator 14 are as shown in FIG. 2. The output of the filter / amplifier 13 is given to the capacitor 14-1 and becomes a signal, after which the operational amplifier 14-is provided via the resistor 14-2. 3 is applied to the-terminal.

The resistor 14-2 has a center voltage level (the center level in the timing charts of FIGS. 4 and 5 which will be described later, which is indicated by a chain line). Is applied via resistor 14-4. The above voltage level Is also given to the + terminal of the operational amplifier 14-3.
The resistance ratio between the resistors 14-2 and 14-4 is preferably about 10: 1.

The output of the operational amplifier 14-3 is the inverter 14-
It is inverted at 5 and output, and is given to the 1/2 divider 15 in FIG. Note that the zero-cross comparator 14 of FIG. 2 described above is one example circuit, and other circuit modifications are possible.

The 1/2 frequency divider 15 inverts the output level every time the output of the inverter 14-5 of the zero-cross comparator 14 rises, that is, every time the signal falls, and divides the frequency by 1/2. The output of the / 2 frequency divider 15 is supplied to the CPU 100 including a microprocessor for controlling the overall circuit operation of the present embodiment, and the A counter 16
Is directly supplied to the B counter 17 via the inverter 18.

The A counter 16 and the B counter 17 are initialized when the respective applied signals rise, and count the clock pulse CLK only during the high level. That is, the time interval between the zero cross points of the waveform signal obtained by dividing the vibration waveform by 1/2 is measured. Then, the measurement operation is stopped by the fall of the applied voltage, and the content is held until the next counting time.

Therefore, in this embodiment, the A counter 16 and the B counter 17
Alternately measures the time intervals between the respective zero-cross points.

Then, the count values of the A counter 16 and the B counter 17 are supplied to the CPU 100.

Reference numeral 19 in FIG. 1 denotes a peak position and envelope detection circuit, which detects the peak position (positive maximum level position) of the output voltage signal of the filter 12 and also obtains the envelope signal obtained by connecting the peak positions. (Envelope signal) is obtained and each signal is
Supply to 00.

The details of the peak position and envelope detection circuit 19 are shown in FIG. 3, and the signal from the filter 12 is supplied to the + terminal of the operational amplifier 19-1, and the output of this operational amplifier 19-1 is the diode 19-2. Is applied to the negative terminal of the capacitor 19-4 via the resistor 19-3 and is also applied to one end of the capacitor 19-4 via the resistor 19-3.

Then, at the other end of this capacitor 19-4, Is given. Therefore, the voltage signal provided through the diode 19-2 is charged only while the voltage signal is higher than the charge voltage of the capacitor 19-4, and the resistor 19 is not charged during the other period.
It will discharge through -5.

The output of the operational amplifier 19-1 is given to the-terminal of the operational amplifier 19-7 via the resistor 19-6. Also,
The resistor 19-6 is connected to the voltage level via the resistor 19-8. Is connected to the positive terminal of the operational amplifier 19-7. Are connected. It is desirable that the resistors 19-6 and 19-8 have the same resistance value. The output of the operational amplifier 19-7 becomes a signal indicating the peak position and is supplied to the CPU 100.

The output of the resistor 19-5 is the − of the operational amplifier 19-9.
The voltage level applied to the positive terminal Is given. The output of the operational amplifier 19-9 is fed back to the-terminal via the resistor 19-10 and is output as an envelope signal via the resistor 19-11. The peak position and envelope detection circuit 19 in FIG. 3 is an example circuit,
Other configurations may be adopted.

The CPU 100 time-division-multiplexes six strings as described later by the CPU 100, supplies them to the A / D converter 7, exchanges them with digital signals, and then performs various processes such as sound generation start processing and mute start processing. Used in.

The A / D converter 7 performs analog-digital exchange processing on the supplied analog signal, and then supplies an A / D end signal to the CPU 100. The CPU 100 uses this A /
The D end signal is accepted as normal processing in the processing of the main routine. Note that the processing efficiency of A / D exchange is further improved by accepting by interrupt. The A / D converter 7 may be a chip separate from the CPU 100 or may be an A / D converter inside a one-chip microcomputer.

The CPU 100 executes various processes in cooperation with the buffer memory 8. Further, MSW in FIG. 1 is a mode selector switch for switching between a normal mode for performing a normal performance and a tone color selecting mode for selecting a tone color. One end is connected to the V _cc level, and the other end is selectively electrically connected to two terminals of the CPU 100.

Further, in the figure, the LED is a display element including a light emitting diode, and is turned on only when a parameter is set in the external sound source module 200.

One end of this display element LED is grounded and the other end is CPU1.
00 to receive a voltage signal from the resistor R.

The CPU 100 is also connected to the MIDI interface 10. This MIDI is Musical Instru
Abbreviation for ment Digital Interface, a unified standard for connecting musical instruments and personal computers of musical instruments. Of course, an interface using a format other than this MIDI format may be used.

Then, via this MIDI interface 10,
External sound source module 200 which is a sound source unit outside the guitar
Then, a tone generation control command, a mute control command, and a pitch change command are output, and the external sound source module 200 is instructed to generate a musical sound in accordance with the performance operation of the strings and frets.

★★ Operation of pitch extraction circuit ★★ Next, the operation of the pitch extraction circuits 1 to 6 of the present embodiment will be described.

Before describing the details, the basic method of pitch extraction of this embodiment will be described first.

The output of the zero-cross comparator 14 that is inverted every time the vibration waveform passes through the zero-cross point is divided by the 1/2 divider 15,
Each time the output level changes, the A counter 16 and the B counter 17 alternately perform the counting operation as described above.

Then, when the peak point of the vibration waveform is detected by the peak position and the envelope detection circuit 19, the measured counter value is added as necessary during the time from the previous peak point to the current peak point. Then, the time length of one cycle of the waveform is calculated. This calculation is performed by the CPU 100.

Therefore, the count value of A counter 16 and B counter 17 is 2
One or either of them can extract the period of the fundamental wave of the vibration of the string that is generated by picking or the like.

FIGS. 4 and 5 show internal timing charts of the pitch extraction circuit 1. When the waveform signal in FIG. 4 does not include overtones and is output through the filter 12,
FIG. 5 shows the operation of each part when the waveform signal including the overtone is output through the filter 12. For overtones higher than that, filter 12
It is removed by the amplifier 13. Therefore, the zero-cross comparator 14 is supplied with a waveform signal including a fundamental wave representing vibration or a harmonic waveform up to a second harmonic.

4 and 5 show the output of the filter 12 of FIG. Then, this waveform signal is given to the peak position and envelope detection circuit 19, and the capacitor 19
-4, a capacitor 19-4 is charged through the operational amplifier 19-1, diode 19-2, and resistor 19-3 each time a voltage signal of a level exceeding the charging voltage is applied, and when the peak position is exceeded, the resistance is reduced. Discharge through the device 19-5, and as a result, the output voltage of the capacitor 19-4 becomes as shown in FIGS. 4 and 5.

Therefore, the resistor 19-11 is connected via the operational amplifier 19-9.
The envelope signal output via the signal is as shown in FIGS.

Also, due to the change in the output of the operational amplifier 19-1, the operational amplifier 19-7 falls at the start of charging the capacitor 19-4 and at the end of charging, that is, at the positive peak position of the vibration waveform. The signal shown in FIG. 5 is output. This becomes the peak position signal shown in FIG.

Further, the output signal of the filter 12 is level-inverted by the filter amplifier 13 and is appropriately filtered and amplified, and is given to the zero-cross comparator 14. The output of the capacitor 14-1 (see FIG. 2) inside the zero-cross comparator 14 is as shown in FIG. 4 and FIG.

Then, the level of this signal is inverted every time it passes through the zero cross point via the operational amplifier 14-3.
As shown in FIG. 5, the inverted output of this signal is supplied from the inverter 14-5.

Therefore, the A counter 16 divides the signal into 1/2 frequency divider 15
At the rise of the output divided by (Figs. 4 and 5),
Clock signal CL until reset and signal inversion
Measure K. Then, after the measurement is completed, the measured value is held.

The B counter 17 performs a counting operation opposite to that of the A counter 16. That is, the B counter 17 measures the clock signal CLK until the signal is reset and the signal is inverted when the signal falls. Then, after the measurement is completed, the measured value is held.

Therefore, when the waveform signal containing only the fundamental wave as shown in FIG.
As can be understood from the above, only one of the A counter 16 and the B counter 17 measures once in one cycle of the waveform.
Therefore, the CPU 100 reads the output of each counter after the measurement is completed, and at the time of peak detection, the counter value detected from the previous peak to the current peak, which is 1 in the case of FIG.
The two values are used as the period of the fundamental wave.

In addition, in order to improve the accuracy of pitch extraction and prevent malfunctions due to noise, etc., only when a match with the pitch extracted the previous time or before is detected and a match within a predetermined error range is detected, It is desirable to determine the vibration frequency.

Now, when the waveform signal containing the second harmonic as shown in FIG. 5 is given from the filter 12, both the A counter 16 and the B counter 17 alternately alternate in one cycle of the waveform, as understood from FIG. It will be measured once.

Therefore, the CPU 100 reads the count content of each counter every time the output signal of the 1/2 frequency divider 15 is inverted,
When the peak position is detected, the counter value detected from the previous peak to the current peak, that is, the two counter values of the A counter 16 and the B counter 17 are added to obtain the cycle of the fundamental wave.

★★ Overall circuit operation, especially CPU operation ★★ Next, the overall circuit operation of this embodiment will be described in detail.

FIG. 6 is a flowchart showing the operation of the CPU 100. In the main routine, the process of reading the count values of the A counter 16 and the B counter 17 for each string and the AD conversion process of the envelope signal are mainly performed.

That is, step S1 is a routine for initializing after power-on, and in this step S1, initializing of the registers inside the CPU 100, the buffer memory 8 and the like is performed.

Next, in steps S2 to S6, the A counter 1 of the first string 1
6, a routine for reading the contents of the B counter 17, and in step S2, it is judged whether the envelope value of the first string exceeds a threshold value. This envelope value is the peak position and envelope detection circuit 19 described above.
The envelope signal output is converted to a digital value by the A / D converter 7. The order of A / D conversion of the envelope signal of each string will be described later.

Then, in this step S2, when it is detected that the envelope of the first string does not exceed the threshold value (that is, the vibration level is small), it is determined that the string is not picked and NO is determined. Go to step S5.

Then, if YES is determined in step S2, the process proceeds to step S3, and it is detected whether or not the output of the 1/2 frequency divider 15, that is, the output of FIGS. 4 and 5 is inverted.

Then, if the determination is NO in step S3, the process proceeds to step S5 without performing any processing. If YES is determined in step S3, the contents of the A counter 16 and the B counter 17 are read by the CPU 100 and transferred to the buffer memory 8 and stored in step S4.

In this case, the CPU 100 reads the contents of the A counter 16 when the signal falls as described above,
When the signal rises, the contents of the B counter 17 are read.

Then, the reading processing of the A counter 16 and the B counter 17 of the first string ends, and the process proceeds to step S5. Step S5
In, the processing of the first string (steps S2 to S4)
The same process as above is performed for each of the second to sixth strings, and the process proceeds to step S6.

Then, in step S6, A / D of the A / D converter 7
D Accept the exchange end signal.

If the AD exchange is not completed yet, this step S6
If the judgment result is NO, the process returns to step S2 to execute the above-mentioned processing, that is, steps S2 to S5, and check step S6 again.

When YES is determined in step S6, the process proceeds to step S7, and the AD-exchanged digital signal is set as the value of the envelope signal of the selected string in the CPU 1
00 is received and stored in a predetermined area of the buffer memory 8. This envelope value is used in the steps corresponding to step S2 in step S2 and step S5 described above.

Next, in step S8, AD exchange of the next string is started. That is, in order to AD-exchange the envelope signals of the first to sixth strings, when the AD exchange of the envelope signal of one string is completed, the AD exchange of the envelope signal of the next rank is started.

Then, after step S8, the process returns to step S2, and the main routine process is repeated in the same manner.

Next, the interrupt processing when the peak position signal output from the peak position and envelope detection circuit 19 arrives will be described.

When this signal rises, the output waveform signal of the filter 12 comes to have a positive peak position (see FIGS. 4 and 5), and the CPU 100 suspends the processing of the main routine, and first, at step T1. Process. At step T1, the CPU 100 appropriately performs addition according to the count value of the A counter 16 or the B counter 17 already read at step S4 to perform pitch extraction.

That is, data representing the time of one cycle is obtained by adding the values of the counter read from the previous peak to the current peak. In this case, in the example of FIG. 4, the count value of one counter of the A counter 16 or the B counter 17 corresponds to one cycle, and in the example of FIG. 5, the count results of the A counter 16 and the B counter 17 are added. The value corresponds to one cycle.

Next, in step T2, a scale table (CPU10
There is a series of data recorded in the internal memory of 0 and showing the relationship between the cycle and the scale (for example, in semitone units). ) To obtain scale information.

In step T3, it is judged whether or not the scale information obtained as a result of the pitch extraction processing as described above matches a predetermined number of times. In this case, the coincidence and comparison of the extraction cycles for two times is the earliest to determine the scale and improve the responsiveness, but by detecting the coincidences more than that, it is possible to improve and stabilize the frequency accuracy. become able to.

If YES is determined in step T3, the switching state of the mode changeover switch MSW (see FIG. 1) is checked in step T4.

If it is determined in step T4 that the normal performance mode is selected, the process proceeds to step T5. In step T5, tone generation control and frequency change control are performed.
That is, the tone generation command of the corresponding tone pitch is output to the external tone generator module 200 via the MIDI interface 10.

Then, after performing the processing of storing the scale information designating the pitch of the generated musical tone in the buffer memory 8 in this step T5, the process returns to the main routine. Therefore, in the main routine, the count value corresponding to the vibration period of each string is CP.
By executing the interrupt processes T1 to T5 while being detected by U100, the external tone generator module 200 is controlled to generate the musical sound of the pitch.

After the start of sound generation, at the time of this interrupt processing, a frequency change command is sent to the external sound source module 200 via the MIDI interface 10 in step T5, and the pitch change control is performed in accordance with the frequency change of the string vibration. To do.
When the string vibration is attenuated, the mute control is also performed at this step T5.
Done in.

If the mode change switch MSW specifies the tone color selection mode as a result of the mode judgment in step T4, the operation is performed. Next, let us explain the operation of this tone color selection specification.

★★ Sound color selection operation ★★ First, at step T6, the fret number F is specified. In step T2, the fret number F can be easily obtained because the scale of the string is known based on the extracted pitch.

Then, in step T7, if the fret number F corresponds to the value of the open string, the determination result is YES, and the process returns to the main flow. If NO in step T7, next step T8
A tone color parameter is created from the string number N of interest and the determined fret number F. That is, the tone color parameter corresponding to the operation fret of the string, for example, data designating the tone color number is read from the table memory inside the CPU 100.

Of course, from both the string number N and the fret number F,
As a method of obtaining the specific timbre parameter, in addition to the table lookup method described above, an operation method of performing a predetermined operation to generate parameter data may be used.

In a succeeding step T9, a data area in the CPU 100 is searched for whether the strings other than the string number N are picked and vibrating. Then, as a result, when it is determined that another string is being operated, the result is Yes in step T10, and the current parameter selection operation is invalidated. If no, the process proceeds to step T11, and the tone color parameter determined in step T8 is sent to the MIDI interface 10.

Further, the display element LED (FIG. 1) is driven to light to indicate that the selection and setting of the parameters are completed.

Now, when a plurality of strings and strings are operated at the same time, the same interrupt processing is performed on other strings until the vibration period of each string is determined, that is, until a certain judgment is made in step T10. As a result, it is determined that the other strings are vibrating in step T10. Furthermore, if the cycle of each string is determined over a longer period than during normal performance, it is possible to improve the accuracy of determination as to whether or not picking of a plurality of strings has been performed at the same time. In other words, even if humans perform picking operations on multiple strings at approximately the same time,
It is not preferable that the electronic circuit, particularly the CPU 100, determines the cycle of the string operated the earliest and sets the tone color parameter in the external tone generator module 200 with the operation fret of the string. Therefore, it is preferable to judge although other strings are simultaneously operated for a while to prevent such a situation.

That is, in the CPU 100, when vibration of an arbitrary string is performed, the timer is started from the detection of the vibration of the string, and after the timer count is completed, that is, after a predetermined time elapses,
When the vibrations of other strings are detected and it is detected that a single string vibration is made, it is only necessary to make a negative judgment in step T10.

As is clear from the above description, if the player wants to select another tone color, the mode change switch MSW on the main body can be selected.
To set the tone color selection mode, press the desired fret of the desired string under this condition and pick the corresponding string. As a result, the tone color corresponding to the string and the fret is set, and the fact is notified by the lighting of the display element LED. It is possible to switch to a desired timbre on the spot without moving to the external sound source module 200, and the operability is very good. In addition, no extra tone select switch is required, and no parts cost is required.

Further, as described above, when there is string vibration in the open string, the tone color setting process is skipped at step T7, and the tone color is set only by accidentally touching the finger. You can prevent it from happening.

In addition, when operating multiple strings at the same time, it is often impossible to confirm which string the tone color is based on,
It is inconvenient if you don't understand unless you switch to the normal performance mode and output the sound. In order to prevent such a problem from occurring, it is significant to set the tone color to non-operation (disable) (return to main flow from step T10) when simultaneously operating a plurality of strings. Is.

Although the tone color parameter (tone color number) is selectively set in the parameter setting mode in the above embodiment, the type of parameter is not limited to this.

In addition, the strings that can be selected and set parameters,
It is only necessary to set the function to only a specific one of the six strings, that is, at least one string. Also, regarding the fret, it is possible to select parameters such as timbre with some frets instead of all frets. May be.

Further, in the above embodiment, the parameters obtained in the parameter setting mode are set in the external tone generator module 200, but the present invention can also be applied to an electronic string instrument of the type in which the tone generator module is provided in the string instrument body.

In addition, in the above-described embodiment, whether the parameter setting operation is performed is clearly indicated by turning on and off the display element LED (step T11), but other display forms may be adopted. The best operability is to display the selected parameter in alphanumeric display on the display of the electronic string instrument body. A display device (for example, LCD panel) for that purpose may be provided.

Further, although the present invention is applied to the electronic guitar in which the six strings are meshed on the body in the above-described embodiment, the present invention can be applied to other types of electronic string musical instruments.

Besides, various modifications can be applied without departing from the scope of the invention.

[Effects of the Invention] As described in detail above, the present invention extracts the pitch from the vibration of the strings, and in the parameter setting mode, the pitching operation of the predetermined string at the predetermined fret operation position corresponds from the extracted pitch. A parameter is obtained and set, and in the first invention, when a plurality of strings are operated in this parameter setting mode, a suppressing means for suppressing the selective setting of the parameter is provided, and in the second invention, In the parameter setting mode, when a string operation is performed in the open string state, a suppression unit is provided to suppress the parameter selection setting.

Therefore, the player can set the desired parameter surely and without error. Also, it is not necessary to provide a dedicated switch for inputting parameters. Therefore, it is convenient in terms of operability and productivity.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a diagram showing a circuit configuration of the embodiment, FIG. 2 is a detailed circuit diagram of the zero-cross comparator of FIG. 1, and FIG. 3 is a peak position. FIG. 4 is a detailed circuit diagram of the envelope detection circuit, FIGS. 4 and 5 are timing charts showing the operation of the embodiment, and FIG. 6 is a flow chart showing the operation of the embodiment. 1 to 6 ... Pitch extraction circuit, 7 ... A / D converter,
14 ... Zero cross comparator, 15 ... 1/2 divider, 16 ... A counter, 17 ... B counter, 19 ...
... Peak position and envelope detection circuit, 100 ... C
PU, 200 ... External sound source module, MSW ... Mode change switch, LED ... Display element.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shigeru Uchiyama 3-2-1 Sakaemachi, Hamura-cho, Nishitama-gun, Tokyo Casio Computer Co., Ltd. Hamura Technology Center

Claims (8)

[Claims] 1. A vibration of a string having a plurality of strings each having a plurality of fret operating positions, the string being fret-operated at a desired fret operating position and then being bounced. Based on the above, the pitch of the corresponding fundamental wave is extracted by the pitch extraction means, and in the electronic stringed instrument that is controlled to generate the tone of the corresponding pitch, the performance mode for performing a normal performance and the setting for selecting and setting the parameters Under the condition that the mode switching means for switching between the modes and the mode switching means performs the mode switching to the setting mode, when the repulsive operation for the predetermined string at the predetermined fret operating position is performed, Parameter setting means for determining the fret position of the operated string from the period of the fundamental wave extracted by the pitch extracting means, and selectively setting the corresponding parameter, When it is detected that at least two strings have been played under the condition that the mode is switched to the setting mode by the mode switching means, the parameter setting means sets the parameter. An electronic stringed instrument, comprising: 2. The tone parameter setting means outputs and sets, as the parameter, tone color designation information for determining a tone color of a tone generated by an external sound source. The electronic stringed instrument according to the item. 3. The pitch extracting means detects a peak position of an electric signal representing the vibration of each string and a peak position detecting means, and outputs the inverted signal every time the electric signal passes through a zero cross point. Zero cross comparator means,
Each time the output level of the zero-cross comparator means is divided by 1/2, the time count means for measuring the time width of the output level and the peak position detection means each time the peak position is detected. The electronic stringed instrument according to claim 1, further comprising: cycle detection means for detecting a cycle of a fundamental wave of vibration of the string based on a time count output of the time count means. 4. The parameter setting means is in a first display state when the setting of the parameter is suppressed by the suppressing means, and the setting of the parameter is performed without being suppressed by the suppressing means. The electronic stringed instrument according to claim 1, further comprising a display element that is in a second display state when the electronic stringed instrument is in a display state. 5. A plurality of strings each having a plurality of fret operating positions are provided, and from the vibration of the strings caused by performing a bullet operation after performing a fret operation on the plurality of strings at a desired fret operating position. , In an electronic stringed instrument in which the pitch of the corresponding fundamental wave is extracted by the pitch extraction means and the musical tone of the corresponding pitch is generated, there are a playing mode in which a normal performance is performed and a setting mode in which a parameter is selected and set. Under the condition that the mode switching means for switching the mode and the mode switching means performs the mode switching to the setting mode, when the plucking operation is performed on the predetermined string at the predetermined fret operation position, the pitch extraction is performed. Parameter setting means for determining the fret operation position of the operated string from the period of the fundamental wave extracted by the means, and selecting and setting the corresponding parameter; When it is detected that the playing operation is performed in the open string state while the mode switching means is performing the mode switching to the setting mode, the parameter setting means sets the parameter. An electronic stringed instrument, comprising: 6. The musical tone parameter setting means outputs and sets, as the parameter, tone color designation information for determining the tone color of a musical tone generated by an external sound source. The electronic stringed instrument according to the item. 7. The pitch extracting means detects a peak position of an electric signal representing the vibration of each string, and a peak position detecting means which inverts and outputs the level every time the electric signal passes through a zero cross point. Zero cross comparator means,
Each time the output level of the zero-cross comparator means is divided by 1/2, the time count means for measuring the time width of the output level and the peak position detection means each time the peak position is detected. 6. The electronic string instrument according to claim 5, further comprising: cycle detection means for detecting the cycle of the fundamental wave of the vibration of the string based on the time count output of the time count means. 8. The parameter setting means is in a first display state when the setting of the parameter is suppressed by the suppressing means, and the setting of the parameter is performed without being suppressed by the suppressing means. The electronic stringed instrument according to claim 5, further comprising a display element that is in a second display state.