JPS63296096A - Electronic stringed instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [9! , Ming's technical field] This invention relates to an electronic stringed instrument, and in particular, the present invention relates to an electronic stringed instrument, and in particular, to an electronic stringed instrument.
Concerning improvements in electronic technology.

[Background of the invention] ゛As an electronic stringed instrument, the whole body is shaped like a guitar.

There are known guitar synthesizers that have synthesizer functions built into them (guitar synthesizers).

For guitar synthesizers, there is a big-up type as one of the methods for detecting playing input from a player.

This pickup type generally uses a pickup sensor (typically a magnetic acoustic sensor) that independently detects the vibration of each string. The output of each pickup sensor is a signal containing various overtone components in addition to the fundamental frequency component. Therefore, the pitch extraction means extracts the fundamental frequency included in the signal. Additionally, by analyzing the output level of the pickup sensor, the timing of the start and end of string vibration is detected.

When fundamental frequency information is extracted and a condition indicating the start of string vibration is established, the processing device sends pitch data corresponding to the extracted fundamental frequency information to an internal or external sound source to instruct it to produce sound.

Further, the processing device instructs the sound source to change the pitch of the generated musical tone when the new frequency information is extracted.

Further, in response to the establishment of a condition indicating the end of string vibration, the processing device instructs the sound source that is producing the string to mute.

Now, in order to improve the mechanical part and operability of this type of electronic stringed instrument, the applicant of this patent has previously installed a
In addition to the normal performance mode, a mode changeover switch is provided to set at least one selection mode, and when a single-note performance input operation is performed with the mode changeover switch setting the normal performance mode. ,
Obtain pitch data according to the input signal from the playing input device,
When an internal or external sound source is instructed to produce sound and the selection mode is set using the mode selector switch, when a playing input operation is performed, a predetermined input signal from the manual playing device is performed. We proposed an electronic stringed instrument in which musical tone parameters can be selected and set (name of the invention "Electronic Stringed Instrument" in patent application 1 dated April 27, 1988).

However, in the electronic string instrument proposed in the future, 1
If you accidentally pick multiple strings in the selection mode, or if you accidentally touch a string and the string vibrates when it is open, the musical tone parameters may change, i.e., when the performer does not intend it, or As a result of Test 3-I, it was found that musical tone parameters different from the intended ones were set as selection parameters for internal or external sound sources.

[First Object of the Invention] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an electronic stringed instrument that can reliably set musical tone parameters intended by a performer.

[Repose of the invention 1 That is, this application achieves the above objectives,
This invention includes the following two inventions.

That is, each invention detects a zero-crossing point immediately after a positive peak point or a zero-crossing point immediately after a negative peak point of the waveform of an electric signal representing string vibration from each string vibration pickup device, and pitch extraction means for extracting the pitch of the string vibration according to a time interval (1+ and/or tz) of the pitch extracted based on the string operation at at least some fret positions of at least some of the strings in the selection mode; It has musical tone parameter setting means for detecting the operated fret position and setting musical tone parameters corresponding to the fret position.

In the first invention, when it is detected that at least two strings are played in the selection mode,
The present invention is characterized by comprising a suppression IF means for suppressing selection and setting of musical tone parameters by the musical tone parameter setting means.

Further, in the second aspect of the present invention, in the selection mode, when it is detected that a string is operated in an open string state, the suppression means suppresses the selection and setting of musical tone parameters by the musical tone parameter setting means. [Embodiments] Each embodiment of the IJ1 will be described in detail below with reference to the drawings.

First Embodiment> Musical instrument main body As shown in FIG. However, a plurality of (six in this case) strings 4 for playing a stringed instrument are strung along its length. In detail, each string 4 is adjustablely supported at one end by a peg 7 and extends on a fingerboard 8, and the other end is fixed to a bridge 13 provided in the body l.

In front of the bridge 13, a string vibration pickup sensor M (for example, composed of a piezoelectric or magnetic microphone) is provided to pick up the vibrations of each string individually. Sensor signals from these pickup sensors M are sent to a peak detection unit (sensor interface) 40, which will be described later, where extraction of peak timing signals and A/D conversion of the sensor signals are performed.

When a string on the fingerboard 8 is fixed to a desired fret 12 with a finger or the like and the string is picked, a signal is generated from the corresponding sensor M, and its fundamental frequency information is determined by the bridge 13 and the fret position of the pressed string. The frequency is related to the material, tension, etc. of the string. The sensor signal is a signal in which various harmonic components are mixed into such fundamental frequency information.

A mode changeover switch MSW is provided on the adjustment section l. Details will be described later, but in this example, the mode selector switch MSW is configured to selectively set the normal performance mode and the tone selection mode. Not yet.

The electronic stringed instrument shown in FIG. 1 is a MIDI instrument, and can be used by being connected to an external MIDI musical instrument. This MIDI is a Musical Instrument.
Abbreviation for Digital Interface, which is an international standard for interconnecting musical instruments or connecting personal computers. In the example shown in the figure, an external sound source device is connected via a cable C that carries serial, asynchronous MIDI signals. 70. Furthermore, external sound source device 2i70
A musical tone signal generated by the system 100 is configured to be emitted as a sound through the sound system 100.

Overall circuit configuration FIG. 2 shows the overall circuit configuration of the electronic stringed instrument according to this embodiment.The left side of the two-dot chain line is the electronic stringed instrument side, and the right side is the outside. Overall control of the electronic stringed instrument is performed by a microcomputer 30. The switch status detection section 50 detects the state of each switch in the panel switch group PSW of the musical instrument body, including the mode changeover switch MSW mentioned above, and is constituted by a well-known circuit. M
The IDI interface 60 is U A RT (Uni
verSal ASynchronous Recei
This is a well-known circuit consisting of a circuit such as ver &trans+witter. The transmitting section of the MIDI interface 60 transmits data provided from the microcomputer 30 to the outside in a format that conforms to the MIDI standard.
This signal is received by the receiving section of the MIDI interface 80 of the external sound source 70. Then, corresponding musical tone control information is given to the musical tone generating circuit 90 through this MIDI interface 80, and the musical tone generating circuit 90 executes operations such as generating musical tones. The peak detection section 40 that processes the signal from the pickup sensor M will now be described in detail.

Peak Detection Section FIG. 3 shows a peak detection section for one channel (indicated by 40-1), where Ml is, for example, the output of the first string pickup sensor.

lNTa1, CI, al, lNTb+, CLh+, L
l is the peak detection section 40-1 and the microcomputer 30
It represents the signals sent and received between.

lNTa+ is a signal indicating the point in time when the signal from the input M1 representing string vibration reaches a positive peak (MAX), and is given to the microcomputer 30 as an interrupt signal. CLa+ is a reset signal given from the microcomputer 30, and lNTb+ is a signal indicating the point in time when the string vibration signal from the input Ml reaches a negative peak (MIN), and is given to the microcomputer 30 as an interrupt signal * CL b I is a reset signal given from the microcomputer 30, Ll is a latch signal indicating that the positive or negative peak value of the signal from input Ml has been A/D converted and held, and peak detection fi40-1
The data is then sent to the microcomputer 30.

The internal aXit of the peak detection unit 40-1 is as shown in the figure, and the sensor signal from Ml is amplified by an amplifier 402, and undesirable harmonic components are removed by a low-pass filter 403 (the cutoff frequency afc+ is set to (approximately four times the frequency of the string), the output (a) of this low-pass filter 403 is illustrated in (a) of FIG. As can be seen from this figure, the signal representing the string vibration from Ml has a waveform containing overtone components in addition to fundamental frequency information. The filtered signal (a) is sent to the positive peak detection circuit 404.
(MAX), negative peak detection circuit 405 (MIN), zero cross circuit 406 (Zero), and A/D conversion circuit 4
11.

The positive peak detection circuit 404 detects the positive peak time of the string vibration signal, and the negative peak detection circuit 405 detects the negative peak time of the string vibration signal. FIG. 4(b) shows an example of the output signal of the positive peak detection circuit 404. The zero cross circuit 406 is a circuit that detects the zero cross of the string vibration signal and inverts its output. For example, it outputs a high level while the string vibration signal is positive, and outputs a low level while the string vibration signal is negative.
Output the level. FIG. 4C shows an example of the output from the zero-cross detection circuit 406. The flip-flop 414 is set by the pulse signal (b) from the positive peak detection circuit 404, while the negative peak detection circuit 405
A flip-flop 415 is set by a pulse from . FIG. 4(d) shows an example of the output of the flip-flop 414. ANDGATE 424 (
Output of FF414 and inversion 4 from zero cross circuit 406
The gate that receives the output from the flip-flop 41 is connected to the flip-flop 41 at the time when the output of the zero-cross circuit 406 changes to Low (that is, when the string vibration signal zero-crosses from positive to negative).
The set output of 4 (indicating that there is a positive peak) is output to the microcomputer 30 as an interrupt signal lNTa+. Therefore, the activation of the interrupt signal lNTa+ indicates that a zero cross from positive to negative has occurred after a positive peak has occurred in the string vibration signal. FIG. 4(e) shows an example of the interrupt signal lNTa. Similarly, the AND gate 425 activates its output, an interrupt signal, when a zero crossing from negative to positive occurs after a negative peak occurs in the string vibration signal (FF 415 sets), and outputs an interrupt signal to the microcomputer 30. give.

On the other hand, the microcomputer 30 accepts the interrupt signals lNTa+ and INTaz.

Immediately thereafter, the corresponding flip-flops 414 and 415 are reset via CLal and CLb.

Also, in response to the signal Ll, the contents of the latch 412, ie, the digital conversion value of the positive or negative peak value of the string vibration signal, are read.

Further referring to the input and output signals of the peak detection section 40-1, the interval at which the output signal lNTa+ becomes active corresponds to the time from the positive peak point of the string vibration signal to the next positive peak point. . To be precise, the signal lNTa+ becomes active at the time when the string vibration input signal reaches a positive peak and crosses to negative zero, and when the string vibration input signal reaches a positive peak again and crosses to negative zero. The signal lNTa+ becomes active again (see Figure 4). On the other hand, the interval at which the output signal lNTb+ becomes active is from the time when the string vibration input signal reaches a negative peak and zero-crosses in the positive direction, until the string vibration input signal becomes active again. This is the time from when the signal reaches a negative peak until it crosses zero in the positive direction.

Such an output signal INTa1. The interval between occurrences of I NTb+ is a measure of the fundamental frequency information of the string vibration.

Unfortunately, due to the influence of overtone components included in the string vibration signal, this interval of occurrence may not correspond to the fundamental period of string vibration. The problem with this overtone component is the peak detection unit 40-
1, we take this into account to a certain extent, and try to reduce its influence (for example, by detecting the occurrence of a zero cross in the opposite direction following each peak), however, we remove the remaining influence. must be performed on the microcomputer 3o side.In short, the preprocessing for pitch extraction is performed by the peak detection i'1140-1, and the final pitch extraction (periodometer 'H) is performed by the microcomputer 30. .

Pitch Extraction in Microcomputer In this example, in order to extract the period, the microcomputer 30 meets the following basic conditions for recognizing the above-mentioned occurrence intervals (for example, the occurrence interval of INTa1, the occurrence interval of INNTb) as the fundamental period. using conditions.

(i) A zero cross to negative (positive) occurs after the positive (negative) peak. (E) After the zero cross in (i) above, a negative (positive) peak occurs, and a zero cross to the end (negative). and (iii) the late (negative) peak of the zero cross in (ii) above occurred, and then a negative (positive) zero cross occurred. Therefore, for example, lNTa+ and lNTb+ occur in turn. In such a case (in which positive peaks and negative peaks occur alternately), the interval t1 between the occurrences of 1NTa+ is evaluated as the fundamental period, and the interval t2 between the occurrences of INTb+ is also evaluated as the fundamental period (see Figure 4). ),
However, in a case where lNTa+ is generated again without generating lNTb+ after lNTa+ is generated, the generation interval of lNTa1 is not evaluated as the fundamental period of string vibration.

FIGS. 5A and 5B show flow examples for the above-mentioned condition test. Here, lNTa is each peak detector 40-
1 to 40-6 are representative signals generated by the zero cross after the positive peak of the vibration signal of each string. Similarly, lNTb is also shown as a representative. Fifth
Both the flows in FIG. A and FIG. 5B are executed in the microcomputer 30 as interrupt processing. Focusing on the movement of the flag, in a positive peak flow (Figure 5A), it is set to "L" during the first wave, and in a negative peak flow (Figure 5B), it is reset to "On" during the first wave. The conditions for period calculation to be performed in a positive peak flow are as follows:
(B2) It is not the 1st wave, (B3) The flag is zero, that is, the first wave of the negative peak has already occurred. In the 0 cycle calculation (B4), from the count value read this time
The length of the cycle is calculated by reading it when the wave is occurring and subtracting the set count value. Then, the calculation result is written into the current cycle data memory, and a cycle confirmation flag is set. Note that the contents in the current cycle data memory are moved to the previous cycle data memory. Note that the counter is a free-running counter in the microcomputer 30, and from the explanation that it is 0 or more, and the clear description itself shown in FIGS. 5A and 5B (7) 7e2-Bl-B5, CI"C5. , the behavior is obvious.

Further explanation will be omitted.

It is also possible to make the conditions for pitch extraction even stricter.
An example is given in No. 745.

±:''Saimachioj As mentioned above, the electronic stringed instrument of this embodiment has a mode selector switch MSN as one of the panel switches on its main body.
(See Figure 1).

This mode changeover switch MSW is, for example, a binary type, and each time it is pressed, the mode of the electronic stringed instrument is changed from normal performance mode to tone setting mode to normal performance mode. That is, the microcomputer 30
In its panel state detection process, when it is notified of a change in the state of a re-panel switch by the switch status detection unit 50, it checks which panel switch has changed. Sets the newly specified mode by rewriting the contents of the flag.

The contents of this set mode flag are referred to in processing for the external sound source 70 through the MIDI interface 60 (FIG. 2). That is, the results of the pitch extraction described above are processed differently depending on the mode. In particular, in this example, the microcomputer 30 receives the interrupt signal L(
N) (a signal indicating that the digital conversion of the peak of the string vibration signal from the Nth string is completed), the flow illustrated in FIG. 6 is executed. Of course, the microcomputer 30 may repeat the process shown in FIG. 6 for each string as a main routine.
The process shown in FIG. 6 can be executed by capturing the data when I N Tb occurs and storing it in the work memory.

First, in step DI, the microcomputer 30 reads the contents of the latch 12 (FIG. 3) of the corresponding peak detector 40. That is, after reading the peak value of the vibration signal of the corresponding string, the process proceeds to step D2, and by checking the value of the mode flag, it is determined whether the mode is normal performance mode or timbre selection mode. When in the normal performance mode, normal performance processing indicated by D3 is executed, and when in the selection mode, tone setting processing indicated by D4 is executed.

Kimoto normal performance processing Motoki The details of the normal performance processing are illustrated in FIG.

First, in the first step El, it is determined whether or not the string of interest is being sounded (for example, by referring to the sound/mute flag for each string).If it is not sounding, the A/D that was read this time Determine whether the output has reached a predetermined note-on level (E2). If it has not, nothing is done. If it has, proceed to step E3 and check whether the period of vibration of that string has been determined. Find out if. If the cycle has not yet been determined, nothing is done, but if it has been determined, proceed to step E4, where the cycle data is read out and data such as note numbers (pitch data) compatible with 1 MIDI is created. This note number and note on are issued to the MIDI interface 60. Furthermore, the tone generation/silence flag for that string is set to the tone generation value. As a result, the note number and note-on signal are sent to the external sound source 70, where a musical tone is generated.

Once the sound generation/mute flag reaches the sound generation value, in the subsequent passes, it is determined at determination step El that sound generation is in progress. In this case, the process proceeds to step E5, where it is checked whether the A/D output has fallen below a predetermined note-off level.

If it has not yet fallen to the note-off level, proceed to step E6, where it is checked whether the period has changed (by comparing the current period data with the previous period data). 8 periods must have changed. Nothing is done, but if it has changed, the process proceeds to step E7, where a note number (pitch data) corresponding to the current cycle data is created and issued to the MIDI interface 60. As a result, the external sound source 70 produces musical tones whose pitch changes in accordance with the periodic changes in the vibration of the first string.

In step E5, when it is found that the A/D output has become below the off level, the process proceeds to step E8, where a note-off is issued to the MIDI interface 60, and the string tone generation/silence flag related to processing is set to the mute value. . As a result, the external sound source 70 attenuates and mutes the musical tone of the string.

Authentic Tone Setting Process The details of the Kimoto tone setting process are illustrated in FIG. First, in step Fl, it is checked whether the vibration period of the corresponding string has been determined. If it has been determined, proceed to step F2 and check whether the current cycle and the previous cycle almost match (by comparing the contents of the current cycle data memory and the previous cycle data memory). , if they match within a predetermined range, the process proceeds to step F3, and the corresponding fret J number F is determined. Then, in step F4,
If the fret number F corresponds to the value of an open string, the result is NO and the process returns to the original flow. No in step F4
In this case, timbre data is created from the string number N of interest and the fret number F determined in step F5.

In step F6, the data area in the microcomputer 30 is searched to see if a string other than string number N has been picked and is vibrating. As a result, if it is found that other strings are being manipulated, then in step F7
ES, and the current operation is invalidated. If NO, the process advances to step F8, and the tone data determined in step F5 is issued to the MIDI interface 60. As illustrated in FIG. 9, when the fret number F and string number N are determined, a specific tone is determined. This can be realized by a conversion table (for example, a memory in which the timbre number is written in a location specified by an address where the string number N is the upper bit and the fret number F is the lower bit) or by calculation. As a result of the processing in step F8, the external sound source 70
In step F9, the timbre of the musical sound to be generated is updated and set, the test pitch data (for example, C
4 note number) and note-on are transferred to the MIDI interface 60. As a result, the external sound source 70 produces a musical tone of pitch C4 with the tone color set in the previous process F8.

Now, when multiple strings are operated at the same time, the same interrupt processing is performed on the other strings before the vibration period of each string is determined, that is, before a YES judgment is made in step Fl. In the end, a YES determination is made in step F7 since the other strings are also vibrating. Furthermore, by taking a longer period of time to determine the period of each string than during normal performance, it is possible to increase the accuracy of determining whether or not multiple strings are being picked simultaneously. In other words, even if a person picks multiple strings at almost the same time, the electronic circuit, especially the microcomputer 30, determines the cycle of the string that was picked earliest, and transmits the tone data to the external sound source 70 using the operating frets of that string. Therefore, in order to prevent such a situation, it is preferable to take some time to judge whether other strings are being operated at the same time. When a string vibrates, a timer is started from the detection of the vibration of that string, and after a predetermined period of time, the vibration of other strings is detected. All you have to do is make a judgment.

As is clear from the above explanation, if the performer wants to select a different tone, he or she can press the mode selector switch MSN on the main body.
Press to set the tone selection mode, and in this state,
Press the desired fret 12 of the desired string and pick the corresponding string 4. This will make that string 4 and 7
The tone color corresponding to Let 12 is set, and this fact is notified from the external sound source 70 through the sound system 100. You can switch to your favorite tone on the spot without having to go to the external sound 1170 one by one, and the operability is very good.Furthermore, there is no need for an extra tone selection switch, and there are no parts costs.

Furthermore, as mentioned above, if there is string vibration with an open string, the routine for timbre setting processing is exited in step F4, and the timbre can be set simply by accidentally touching the string with a finger. You can prevent this from happening.

In the above embodiment, when a predetermined string is picked at a fret operation position, a musical tone of the set tone is automatically generated (step F9), depending on what tone is set. Not exclusively.

In other words, during a performance on stage, etc., when switching to a predetermined tone using the above-mentioned picking operation, you may not want the listener to hear music a of the set tone. It is necessary to avoid pronouncing the musical tones.

Therefore, for example, as shown in FIG.
UW is provided, and by switching this switch PUW,
It may be determined whether or not to generate a set musical tone, or even when a musical tone such as a predetermined tone is set by a picking operation, the musical tone such as that tone may not be generated at all.

In this way, if the confirmation sound (test line) does not occur,
As described above, when multiple strings are operated simultaneously, by not setting the tone, operability can be improved. In other words, when operating multiple strings at the same time, it is often impossible to confirm which string's operation has set the tone, and it is inconvenient to have to switch to normal performance mode and output the sound. It is. In order to prevent such problems from occurring, it is meaningful to disable the tone and tone settings from the beginning when operating multiple strings simultaneously.

In order to further improve operability, a display section can be provided on the main body of the electronic stringed instrument, so that when tone settings are made by picking the strings, the player is notified of the completion of the settings by lighting up, etc. If the tone numbers and names themselves are displayed in alphanumeric form, it will further prevent operational errors.

Furthermore, the function can be set for only a specific string among the six strings, that is, for at least one string, and for frets, not all frets but some frets. You may also be able to select the tone with .

Second Embodiment Next, a second embodiment of the present invention will be described. In this embodiment, the sound source includes a rhythm sound source circuit that generates rhythm sounds and a memory that stores rhythm patterns for operating the circuit.

This rhythm pattern is selected and set by operating the strings in a setting mode different from the above-mentioned performance mode. That is, the mode changeover switch allows switching between a normal performance mode and a rhythm pattern setting mode. In normal performance mode, the melody sound source is controlled in response to a single note input, and a musical tone for playing is generated.In rhythm pattern setting mode, a specific rhythm pattern is selected according to the operating fret position on the fingerboard. be done. After returning the mode changeover switch MSW to the normal performance mode, when the rhythm start is activated, the set rhythm pattern is automatically played.

FIG. 1θ shows the processing at the time of interaction, that is, when the signal L (N) arrives, corresponding to FIG. 6 of the first embodiment described above, step Gl is changed to step DI, and step G2 is D2 and step G3 correspond to step D3.

These processes have already been described.

Step G4 is a process unique to this embodiment, and the details of the process are shown in FIG. 11. Steps H1-H9 in FIG. 11 correspond to steps Fl-F9 in the first embodiment. , the difference is that in step H5, the rhythm pattern number is determined based on the string number N and fret number F.

Then, in step H8, the rhythm pattern number is given to the rhythm pattern memory in the rhythm sound source, and in step H9
So, what kind of rhythm pattern is selected?1
A rhythm sound is generated according to a rhythm pattern only once, and is notified to the performer.

The automatic rhythm performance based on the rhythm pattern selected in this way is started in accordance with the rhythm start instruction in the first normal performance mode. You can play the guitar along with this.

In this way, in this second embodiment as well, if there is string vibration in an open string, the rhythm selection processing routine is exited at step 2 H4, and it is possible to avoid accidentally touching the string with a finger. This prevents rhythm pattern selection and settings from being made just by touching it.

Further, since the rhythm pattern is not selected and set when a plurality of strings are operated simultaneously, it is possible to improve the operability when selecting a rhythm pattern.

It should be noted that this second embodiment can be modified in various ways, such as adding a display section, as in the first embodiment.

Furthermore, it is not necessarily necessary to generate rhythm sounds as a test when selecting a rhythm pattern.

Furthermore, although the first and second embodiments disclose techniques for selecting tone colors and rhythm patterns, other selections such as effects may also be made.Furthermore, the mode switch MSW can be used to select three modes, viz. , the rhythm selection mode, the tone selection mode, and the normal performance mode may be selectively selected, and the necessary functions may be incorporated into the microcomputer 30, or,
The present invention can also be applied to an electronic stringed instrument that has an internal sound source in its main body and also has a function such as a MIDI function that allows it to communicate with an external musical instrument. This modification is easy. As other selection modes, a mode for selecting song numbers can also be included. In addition, various modifications can be made easily.

[Effects of the Invention] As described above, the present invention detects the zero-crossing point immediately after the positive peak point or the zero-crossing point immediately after the negative peak point of the waveform of the electric signal representing string vibration from each string vibration pickup device. The time interval for each zero crossing point (
1+ and/or t2), the musical tone parameter setting means detects an operating fret position from the pitch extracted in the selection mode, and sets musical tone parameters corresponding to the fret position. In the first invention.

When a plurality of strings are operated, a suppressing means for suppressing the selection and setting of musical tone parameters is provided, and in the second invention, when a string is operated in an open string state, the selection and setting of musical tone parameters is suppressed. We have put in place deterrent measures.

As a result, the musical tone parameters intended by the performer are reliably achieved.
This allows for accurate settings. Moreover, there is no need to provide special manual equipment for this purpose, which not only improves operability but also contributes to cost reduction.

[Brief explanation of drawings]

Fig. 1 is a schematic external view of an electronic stringed instrument according to a first embodiment of the present invention, Fig. 2 is an overall configuration diagram showing an example of the use of the first embodiment, and Fig. 3 is a diagram of the peak detection section of Fig. 2. Circuit configuration diagram, 4th
The figure is a timing chart of the signals of each part of the peak detection section.
Figure 5A is a flowchart of an interrupt process executed by the microcomputer in Figure 2 for pitch extraction when detecting a zero cross point after a positive peak point, and Figure 5B is a flowchart of an interrupt process executed by the microcomputer in Figure 2 to extract a negative peak point for pitch extraction. FIG. 6 is a flowchart of the mode-specific processing executed by the same microcomputer, FIG. 7 is a detailed flowchart of the normal performance processing of FIG. 6, and FIG. FIG. 6 is a detailed flowchart of the tone setting process, FIG. 9 is a diagram showing the logic for determining the tone from the string number and fret number, and FIG. FIG. 11 is a flowchart of the mode-specific processing to be executed, and is a detailed flowchart of the rhythm selection processing of FIG. l...Body, 4...Strings, 12...
... Fret, 30 ... Microcomputer, 40 ... Peak detection unit, 70 ... External sound source, 404 ... Positive peak detection circuit, 405
... Negative peak detection circuit, 406 ... Zero cross circuit, 411 ... A/D converter, 41
4.415...Flip-flop, M...
・・String vibration pickup sensor, MSN・・・・・
Mode changeover switch. Figure 4 Figure 5A Figure 5B Figure 6 Figure S Figure 9 Figure 10

Claims (4)

[Claims] (1) A plucking input device is provided that detects a plucking input from a player to each string at each fret operation position, and this plucking input device includes a string vibration pickup device provided for each string, and a plucking input device for each string. a peak point detection means for detecting a positive peak point or a negative peak point of a waveform of an electric signal representing string vibration obtained from a vibration pickup device; a zero-crossing point detection means for detecting a zero-crossing point of this waveform; After the positive peak point detected by the output means is detected, the time interval (t_1) of each zero cross point detected by the zero cross point detection means is detected for the first time, or the time interval (t_1) of each zero cross point detected by the peak point detection means is detected. After the negative peak point is detected, the time interval (t_2) for each zero cross point detected by the zero cross point detecting means is detected for the first time, or the time interval (t_1) and the time interval (t_2) are detected. at least one of detecting both of
An electronic stringed instrument comprising pitch extraction means for extracting the pitch of string vibration by performing two steps, the pitch extraction means being provided on the main body of the stringed instrument and configured to set at least one selection mode other than the normal performance mode. When a playing input operation is performed on a predetermined string at a predetermined fret position while the normal performance mode is set by the mode selector switch and the above mode selector switch, the above-mentioned plucking input device will extract the input operation. a musical tone control means that obtains pitch data corresponding to the selected pitch and instructs an internal or external sound source to produce sound; When a plucking input operation is performed on a predetermined string at a certain position, the fret position of the operated string is determined from the pitch extracted by the plucking input device, and the corresponding predetermined musical tone parameter is selected and set. a setting means; when it is detected that at least two strings have been operated for playing input while the selection mode is set by the mode changeover switch, the musical tone parameter setting means sets the corresponding predetermined value; An electronic stringed instrument characterized by comprising: a deterrent means for inhibiting selection and setting of musical tone parameters; (2) In the electronic stringed instrument according to claim 1, the musical tone parameter setting means is configured to set a predetermined musical tone parameter to a tone of a musical tone to be generated by the internal sound source or external sound source or to be played in automatic rhythm performance. An electronic stringed instrument characterized in that at least one of the following rhythm patterns is set. (3) A plucking input device is provided that detects plucking input from the player to each string at each fret operation position, and this plucking input device includes a string vibration pickup device provided for each string, and a plucking input device for each string. a peak point detection means for detecting a positive peak point or a negative peak point of a waveform of an electric signal representing string vibration obtained from a vibration pickup device; a zero-crossing point detection means for detecting a zero-crossing point of this waveform; After the positive peak point detected by the output means is detected, the time interval (t_1) of each zero cross point detected by the zero cross point detection means is detected for the first time, or the time interval (t_1) of each zero cross point detected by the peak point detection means is detected. After the negative peak point is detected, the time interval (t_2) for each zero cross point detected by the zero cross point detecting means is detected for the first time, or the time interval (t_1) and the time interval (t_2) are detected. at least one of detecting both of
An electronic stringed instrument comprising pitch extraction means for extracting the pitch of string vibration by performing two steps, the electronic stringed instrument having a mode provided on the main body of the stringed instrument for setting at least one selection mode other than the normal performance mode. When a playing input operation is performed on a predetermined string at a predetermined fret position while the normal playing mode is set by the mode selector switch and the mode selector switch, the playing input device extracts the a musical tone control means that obtains pitch data corresponding to the selected pitch and instructs an internal or external sound source to produce sound; When a plucking input operation is performed on a predetermined string in , the fret position of the operated string is determined from the pitch extracted by the plucking input device, and the corresponding predetermined musical tone parameter is selected and set. means, when it is detected that a playing operation has been performed on an open string while the selection mode is set by the mode changeover switch, the tone parameter setting means sets the corresponding predetermined value. An electronic stringed instrument characterized by comprising: a deterrent means for inhibiting selection and setting of musical sound parameters; (4) In the electronic stringed instrument according to claim 3, the musical tone parameter setting means is configured to set the musical tone parameter to be generated by the internal sound source or the external sound source, or to be played in automatic rhythm performance. An electronic stringed instrument characterized in that at least one of the following rhythm patterns is set.