JPH01182887A - Electronic string instrument - Google Patents

Abstract

PURPOSE:To improve a playing effect by judging a popping playing method, etc., to be executed and generating a prescribed tone when the change of a peak level in a prescribed polarity side to be detected with a level detecting means is successively increased in prescribed times at the time of inputting an input waveform signal to be generated with being accompanied string oscillation. CONSTITUTION:When the change of the peak level in the prescribed polarity side to be detected by a level detecting means PEDT is successively decreased in the prescribed times at the time of the input of the input waveform signal to be generated with being accompanied the string oscillation, the popping playing method, etc., is judged to be executed and the prescribed tone to be different from a scale tone, especially, the tone, from which periodicity is not felt, is generated. Then, suitable acoustics are generated at the time of playing operation by the popping playing method, etc. Thus, a tone different from the scale tone is generated and the playing effect is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electronic stringed instrument such as an electronic bass guitar, and in particular detects the performance of popping or pulling techniques (hereinafter referred to as popping techniques, etc.). The present invention relates to an electronic stringed instrument that generates a predetermined tone different from a specified scale tone.

[Prior art]

Various electronic musical instruments have been developed in which the pitch (fundamental frequency) is extracted from the waveform signal generated by the playing operation of a natural musical instrument, and a sound source device composed of an electronic circuit is controlled to obtain sounds such as musical tones. has been done.

One of these electronic musical instruments is an electronic bass guitar or bass guitar synthesizer, but when playing such as popping techniques on such instruments, a different scale tone than the one originally specified by the 7th note is imposed. It starts to occur, and then it ends up changing to the original scale note.

In other words, the popping playing method is a playing method in which the strings are vibrated by hitting them with the thumb, and the pulling playing method is a playing method in which the strings are vibrated by pulling the strings. The first pitch extracted is a period of a note different from that of the 7-let operation. Therefore, as described above, after a momentary sound with a different frequency is produced, the frequency is changed to a sound with the original scale frequency.

Therefore, a problem arises in that scale tones not intended by the performer are generated, which are very difficult to hear and are musically inconvenient.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and detects that a popping technique is used, and first generates a predetermined sound such as a noise sound or percussion sound whose pitch is difficult to judge, which is different from a scale note. The purpose of the present invention is to provide an electronic stringed instrument designed to perform the following functions.

[Key points of the invention]

In order to achieve the above object, the present invention sequentially decreases the change in the peak level on the predetermined polarity side detected by the level detection means a predetermined number of times at the start of input of an input waveform signal generated in conjunction with string vibration. In such a case, the key point is that the determining means determines that a popping technique, etc. has been performed, and generates a predetermined tone different from the above-mentioned scale notes. Therefore, the input waveform signal unique to the popping technique, etc. The relevant playing style is detected, the above-mentioned noise sound and percussion sound are output at the beginning of musical sound generation, and then, when the original 7-let cycle is detected in pitch extraction, the relevant scale note is generated accordingly. will be done.

〔Example〕

Embodiments of this invention will be described below with reference to the drawings.
The present invention will be described using an example in which the present invention is applied to an electronic pace guitar, but the present invention is not limited to this and can be similarly applied to other types of electronic stringed instruments.

FIG. 1 is a block diagram showing the entire circuit, and the pitch extraction analog circuit PA is provided for each of six strings (not shown) strung on an electronic bass guitar body, for example.
A hexa pickup that converts string vibrations into electrical signals,
A zero-cross signal and waveform signals Zi, Wi (i=1 to 6) are obtained from the output from this pickup, and these signals are converted into time-division serial zero-cross signals ZC, R and digital output (time-division waveform signal) Dl. It is provided with a converting means for converting, for example an analog-to-digital converter A/D.

As shown in FIG. 2, the pitch extraction digital circuit PD consists of a peak detection circuit PEDT, a time constant conversion control circuit TCC, a peak value acquisition circuit pVS, and a peak time acquisition circuit ZTS, and includes the pitch extraction analog circuit FA. Serial zero ps signal ZCR from.

The maximum peak point or the minimum peak point is detected based on the digital output D1 and MAXI, MINI (I; 1 to 6)
At the same time, it outputs an interlat (interrupt) signal INT to the microcomputer MCP when it passes a zero cross point, more precisely, when it passes a zero cross point immediately after the maximum peak point or minimum peak point, and also outputs the time information of the zero cross point and peak value information, e.g. MAX.

MIN and the instantaneous value of the input waveform signal respectively.
This is to be output to the CP. Note that the peak detection circuit PB
The DT is equipped with a circuit that holds the error peak value while subtracting it.

The time constant conversion control circuit TC changes the attenuation rate of the peak hold circuit of the peak detection circuit PEDT.
C, and when the peak of the waveform cannot be detected even after one period of time has elapsed, the waveform is made to attenuate rapidly. Specifically, in the initial state, in order to quickly detect waveform vibrations, the maximum sound period is rapidly attenuated, and when string vibration is detected, in order not to pick up overtones, the open string period time of the string is Similarly, after the vibration period of the string is extracted, rapid damping is performed at that period.

The setting of the cycle information for the time constant conversion control circuit TCC is performed by the microcomputer MCP. Then, a counter independent of each string in the time constant conversion control circuit TCC is compared with the set cycle information, and a time constant change signal is sent to the peak detection circuit PEDT when the cycle time has elapsed.

In addition, the peak value acquisition circuit PvS in FIG. 2 demultiplexes the waveform signal (digital output) Dl sent out in a time-divisional manner as described above into a peak value for each string, and outputs the signal from the peak detection circuit PBDT. peak signal MAXI
, MINI to hold the peak value. Then, the maximum peak value or the minimum peak value of the string accessed via the microcomputer MCP chain recorder DCD is output to the microcomputer path. Moreover, the instantaneous value of vibration for each string can also be output from this peak value acquisition circuit PvS.

The zero-crossing time acquisition circuit z 'i' s converts the time base counter output common to each string to the zero-crossing point (
Strictly speaking, the signal is latched at the zero point immediately after passing the maximum peak point and the minimum peak point. Then, in response to a request from the microcomputer MCP, the latched time information is sent to the microcomputer path.

Further, the timing generator TG shown in the figure outputs timing signals for processing operations of each (b) path shown in FIGS. 1 and 2.

The microcomputer MCP has memory such as ROM and RAM.
It also has a timer T, and a sound source generator S.
It controls the signals given to the OB. The sound source generator fffsOB consists of a sound source SS, a digital-to-analog converter D/A, an amplifier AMP, and a speaker SP.
The microcomputer M CP emits musical tones of pitches corresponding to note-on (sound generation), note-off (mute), and pitch instruction signals that change frequency. Note that an interface (lduslcal lnstrume) is connected between the input side of the sound source SS and the data bus BU8 of the microcomputer MCP.
nt Qigital Interface)
MIDI is provided. Of course, when the sound source SS is provided in the guitar body, it may be provided through another interface. Address decoder DCD is microcomputer MC
When address read signal AR from P is input,
String number read signal H/DI.

Time reading signal RDj (j=1 to 6) and MAX.

The peak value of MIN and the instantaneous value read signal RDAI (I=1 to 18) at that point in time are output to the pitch extraction digital circuit PD.

The operation of the microcomputer MCP will be described below with reference to the 70-chart and drawings showing waveforms, but first, the reference numerals in the drawings will be explained.

AD...Instantaneous value read signal RDA13 to 18 in Fig. 1
Input wave height value (VR time value) obtained by directly reading the input waveform of the pitch extraction digital circuit PD by AMPyNO, 1)...Positive or negative previous (old) wave height value AMRLl...Memorized in the amplitude register The previous amplitude value for the relative off (off) check. Here, the relative off refers to muting the sound based on the rapid attenuation of the peak value, and corresponds to the muting process when the 7-let operation is stopped and the string is moved to an open string.

AMRL2: The amplitude value of the previous relative off stored in the amplitude register, to which the value of AMRL1 is input.

CHT I M...Period corresponding to the highest note 7th fret (22nd fret) CRTIO...Period CHT corresponding to the open string fret
RR: Time constant conversion register, provided inside the above-mentioned time constant conversion control circuit TCC (FIG. 2).

DUB...Flag indicating that the waveforms have come in the same direction FOFB...Relative off counter HNC...Waveform number counter MT...Flag for the side from which pitch extraction is to be performed (positive =
1. Negative = 0) NCHLV...No change level (constant) OF'T
IM...Off time (e.g. corresponds to the open string period of the string) OFFT...Normal off-check start 7 lag ONF...
・Note-on flag PP: 1.2 when a popping technique is performed, etc.
Flag RIV... 7 lags for switching the processing route in STEP 4 (described later) ROFCT... Constant 5 TEP that determines the number of times the relative off is checked... 70-operation of the microcomputer MOP Specified register (1 to 5) TF... Last zero-crossing time data that became valid TFN (0,1)... Previous zero-crossing time data immediately after the positive or negative peak value TFR... Time storage register □ THLIM...Frequency upper limit (constant) TLLIM...Frequency lower limit (constant) TP (0,1)...Positive or negative previous cycle data TALAB (0,1)...Positive or negative absolute Trigger level (note-on threshold) TRLRL...Relative-on (re-sounding start) threshold TRLR8...Resonance removal threshold TTLIM...Frequency lower limit at trigger TTP...
Previously extracted cycle data 'TTR...Cycle register TTU...Constant (product of 17732 and current cycle information 11) TTW...Constant (product of 31/16 and current cycle information 11) VEL... - Information that determines velocity (velocity), determined by the maximum peak value of the waveform at the start of sound generation.

X: 7 lags indicating abnormality or normal condition b: Current positive/negative flag stored in working register B (1 when the zero point is next to the positive peak, 0 when the zero point is next to the negative peak) C... Current wave height value (peak value) stored in working register C e... Wave height value (peak value) from the previous time stored in working register E h... Stored in working register H Periodic data extracted before the previous time 1t... The current zero-crossing time number stored in the working register TO.

11... Stored in working register TOTO ・
Current cycle information No. 1 Figure 3 shows an interrelated routine that shows the processing when an interrelated message is applied to the microcomputer MCP.
At 1, the microcomputer MCP gives a string number read signal RDI to the ZET4 time acquisition circuit ZT8 via the address decoder DCD, and reads the string number that specifies the string to which Interabdo has been given. It's crowded. Then, time information 1 corresponding to that string number, that is, zero-crossing time information, is sent to the zero-crossing time reading circuit ZTS as time reading signals RD1 to RD6.

Give one of the corresponding values and read it. This is t 〈
shall be. After that, at I2, the peak value 5
Acquisition circuit PvS heavy value read signal RDAI
& (engine = any one of 1 to 12) and pin
4- Read the value. Let this be C.

In step I3, information indicating whether the peak value is a positive or negative peak is obtained from the time acquisition circuit ZTS. Then, in Step 4, the values of t, C, and b obtained in this way are set in the registers To, C, and B of the buffer in the microcomputer MCP. Each time an interrupt process is called, this buff 7a is filled with time information, peak value information, and information indicating the type of peak. 〉 information is processed.

The fourth tooth is a flowchart showing the main routine. By turning on the power, four types of registers and flags are activated in Ml, and register 5TEP is activated.
is set to 0. At I2, it is determined whether the above-mentioned buffer is empty, and if the answer is NO (hereinafter referred to as "N"), the process proceeds to MS, where the contents of registers B, C, and TO are read from the buffer. Accordingly, in I4, register 8TEP has some breakable values, 8TEPO in MS, STE in MS.
5TEP2 for P1 and M7. M8 is ST, EP3゜M
In step 9, the processing of 5TEP4 is performed sequentially.

If the buffer is empty in M2, that is, if the answer is YES (hereinafter referred to as Y), the process proceeds sequentially to MIO-M16, where normal note-off processing is performed. This note-off algorithm turns the note off if the state remains below the off (OF) level for a predetermined off time period.It is determined at 0M10 whether 5TEP=0, and if N, the process proceeds to Mll. . In Mll, the input peak value AD at that point in time is directly read. This is the peak value acquisition circuit p
This can be achieved by applying any one of the peak value read signals RDA13 to FLDA18 to vs. And this value A
It is determined whether D is at an off level as compared to the input peak value AD, and if Y, the process proceeds to M12. In M12, it is determined whether the previous input wave height value AD≦off level, and in the case of Y, the process proceeds to M13, where the value of timer T>off time O
It is determined whether l is FTIM (eg, a constant of the open string period of the value). In the case of Y, the process advances to M14, O is written to the register 5TEP, it is determined in M2S whether or not the note is on, and in the case of Y, 7-too7 is written in M16.
processed and returns to M2 via M. If N in M12, the process advances to M17, starts the microcomputer MCP internal timer T, and instructs M13. In the case of M2S and N, both
Return to 12.

In this way, when the level of the waveform input is attenuated, the input peak value AD below the off level becomes the off time OFTIM.
After a period of time corresponding to , the microcomputer MCP sends a note-off instruction to the sound source SS. Note that step M15
In the normal state, a determination of Y is made, but if the generation of a musical tone is not instructed by the processing described later, M14. Initial settings are made by returning to M2 after processing M2S.

Although FIG. 4 only shows the processing for one string, the microcomputer MCP multiplexes the processing shown in this figure six times corresponding to the number of strings. Of course, a plurality of processors may be provided to independently execute equivalent processing.

Next, details of processing of each routine branched at M4 will be explained.

FIG. 5 shows step 0 (STE) shown as M5 in FIG.
PO), and the absolute trigger level (note-on threshold) TRLAB (b) is 801.
(It is judged whether the wave height value is C this time, and if it is Y, it is 80
2, a check is made to eliminate resonance. In addition,
This trigger level is designed to check for positive and negative polarity peaks, respectively. This TRL
AB(0) and TRLAB(1) are determined to be appropriate values through experiments and the like. In an ideal system T
RLAB (0) and TRLAB (1) may be the same. In 802, it is determined whether the resonance removal threshold value TRLR8 ([current peak value C-previous peak value AMP (b)], that is, whether the difference between the current peak value and the previous peak value is greater than or equal to a predetermined value.

When picking one string causes other strings to resonate, the vibration level of those other strings gradually increases, and as a result, the change in peak value between the previous time and this time is small. The difference is the resonance removal threshold T
It will never exceed RLR8. However, in normal picking, the waveform rises (or falls) suddenly.
Therefore, the difference between the peaks is the resonance removal threshold TRL
Surpass Rin S.

Now, in 802, if it is determined that the case is Y, that is, it is not a case of resonance, the following processing is performed in 803. That is, the current positive/negative flag b is written to the flag MT, the register 5TEPJCI is written, and the current zero-crossing time t is the previous zero-crossing time data TFN.
(b). Then, at SO2, other flags are initialized, and the process proceeds to SO2. S.O.
5, the current wave height value C is set as the previous wave height value AMP (b), and then the process returns to the main 70 in FIG.

In the 5th v4, A beam latipeon (start of repronunciation)
It shows the entry of 70- of 8TEP4, which will be described later.
From this 806 hejiambu comes.

Then, in S06, the musical tones that have been output so far are once erased, and the process advances to 803 to start producing sounds again.

The process for starting the re-sounding is the same as when starting the normal sounding, and will be described in detail below.

Then, in the case of N in 801 and in the case of N in S02 (
If current peak value C-previous peak value AMP (b) is not equal to or greater than a predetermined value), the process proceeds to SO5. Therefore, the process for starting sound generation will not proceed.

8T mentioned above] 13PO (8TBPQ in Figure 11 → 1
), the contents of the B register (b=1) are set in the flag MT.
is written, the contents of register TO (1) are written to the previous zero clock time data TFN (1), and the peak value (C) of register C is written to the previous peak value AMP (1). It will be done.

FIG. 6 shows details of the 70-chart of 8TEP1 shown as M6 in FIG. 4. In S11, it is determined whether the contents (b) of register B and the flag MT do not match. proceeds to 812. In 812, the absolute trigger level (note-on threshold) TRLAB (b)
<It is judged whether the current wave height value is C, and if it is Y, it is 81
Proceed to step 3.

If 812 is Y, 2 is set in register 5TEP, and in 1S14, the contents (1) of register TO are set as the previous zero cross time data TFN (b), and in 815, the current peak value C is set as the previous time. The wave height value AMP (b
) to heset. In 811, if N, that is, the input waveform signals come in the same direction, the process proceeds to 816, where it is determined whether the current wave height value C>previous wave height value AMP (b), and in the case of Y, that is, the current wave height value C is the same as the previous wave height value. Wave height AM
If it is greater than P(b), the process advances to S14. On the other hand, 81
In the case of N in step 2, the process advances to S15, whereby only the peak value is updated. Further, in the case of N in step 816 and when the processing in S15 ends, the process returns to the main 7o (FIG. 4).

In the above-mentioned 5TEPI (between 5TBP1→2 in Figure 11), this time the positive and negative 7 lags b (=0) and 7 lags M'r
Since =l does not match, the current zero cross time [ is set as the previous zero cross time data TFN (0), and the current wave height value C is set as the previous wave height value AMP (Q)
Write as.

Figure 7 shows the 8TEP2 70-
This shows the details of the chart, and in S20, it is determined whether this time positive/negative 7 lag b=flag MT, that is, s'rgpo
Determine whether the zero point is arriving in the same direction as
If Y, proceed to 8201. In step 8201, it is determined whether the player is playing using the big drum or picking with his fingers.

This can be determined by the player inputting and setting in advance which performance state the electronic bass guitar is in using an external switch provided on the main body of the electronic bass guitar. Of course, other methods may be used to discriminate between the two.

The shape of the input waveform signal that occurs with string vibration when using this vibrator, especially the negative polarity peak (MIN)
The change in the input waveform signal is similar to that of the input waveform signal caused by the above-mentioned popping technique (this has been confirmed experimentally), and since it is not common to strike the strings with a sharp pitcher, When using the big, the process advances from 5201 to 822, and processing for popping performance etc. is not executed.

If you are not using BIC, go to 5202,
Judges whether b=1 or 0, that is, detects whether it is a negative peak. As will be explained in detail later, when playing with popping, as shown in Figure 12, for example, the negative side (of course, it can be changed to the positive side by changing the polarity of the pickup coil and the positive and negative polarities of the electronic circuit, but in any case, , - If the system is set to - degree, the peak of the waveform will be on one of the fixed polarity sides.) will gradually decrease (α>β
> r) has been experimentally confirmed, and in order to judge the change in the peak of this negative electrode, b = o at 8202.
When the judgment (N judgment) is made, the process proceeds to 5203, and it is detected whether the current wave height value C>previous wave height value AMP (0). If it is N, there is a possibility that a popping technique was used for the above-mentioned reason. Assuming that there is, proceed to 5204 and 7 lag P
Set P to 1. The time when the determination of Y is made in 5202 and the time when the determination of Y is made in 8203 are as follows:
Proceed to 22.

822, checks whether the current wave height value c) (7/8) x previous wave height value AMP (b), that is, whether the wave height value is consulted between the previous time and this time, and if Y, that is, beautiful natural attenuation. In this case, the process proceeds to S23, sets the flag DUB to O, and proceeds to S24. Further, after executing 5204, the process advances to 823.

Then, in S24, periodic calculation is performed, and the current zero-crossing time [-previous zero-crossing time data TFN (b)
is input into the previous cycle data TP (b), and the current zero crossing time t is input into the previous zero cross time data TFN (b).
Enter as . TP (b) in 824 is ST
It is used as a condition for 7-ton (1,5 wave) at gPa. Further, in 824, register 5TEP is set to 3. Furthermore, the current wave height value C and the previous wave height value AMP
(0) and the previous peak value AMP(1), the largest i is registered as the velocity VBL. Also, the current wave height value C is written into the previous wave height value AMP (b).

Then, in the next step 8241, it is determined whether the register PP is 1 or not, and when it is Y, in 5242, the value of the period of TP (0) is set in the register CHTIO in the time constant conversion control circuit TCC to the register CHTRR. Note that when a popping technique is performed, the attenuation of the peak value of the input waveform signal immediately after input is large, so the open string period CR is added to CHTRR.
If the TIO is set, there is a possibility that the second and third peaks will not be detected, so the above-mentioned processing is performed. This TP (0) is shown in FIG.

In the case of N at 820, the process advances to S25, sets the flag DUB, which means that an input waveform in the same direction has arrived, to 1, and proceeds to 826. ) is determined,
In the case of Y, the process proceeds to 829. At step 829, the previous peak value AMP (b) is rewritten to the current peak value C, and the previous zero cross time data TFN (b) is rewritten to the content t of the register T. In addition, in S22, in the case of N, 82
Proceed to step 7 and check whether flag DUB=1, that is, 5T last time.
When EP2 is executed, a check is made to see if it has been duplicated, and if Y, that is, if it has been duplicated, the process proceeds to 828. 82
8, set the 7 lag DUB to 0. In this case 829
to return to the main routine. After the process of 824, the N toki of S26 also returns to the main routine (RET).

8TEP2 mentioned above (5TEP2→3 in 8g11 diagram)
(between), the flag MT = 1 is rewritten as positive and negative 7 lag b this time, 7 lag DUB is set to 0, and the cycle calculation becomes < TFN (1) → T P (1), and this time At zero-crossing time t, the previous zero-crossing time data TFN (1) is rewritten, and the current peak value C1, the previous peak value AMP (0), and the previous peak value AMP
The largest value of (1) is set as the velocity VEL, and the previous wave height AMP is set as the current wave height value C.
(1) is set.

Then, it is also determined whether or not a popping technique, etc. is being performed, and if the contents of register PP are set to 1, CHTR
CHTIO is set in CHTRR unless RJ (TP (0) is Sera), tL, (-U).

FIG. 11 shows an example where there is an ideal waveform input, but the case where DUB=1 will be described next. 8th
The figure is a diagram for explaining the operation of 5TEP2 in such a case. (A) is a case in which peak detection is performed by skipping the - wave, and when the input waveform is a solid line, s'rE described later
A note is turned on in the process of p3, and a note is not turned on when the input waveform is a dotted line. This is due to the difference in whether the result at 826 is Y or N. Also, the reason why it is difficult to shift from 5TEP2 to 8TBP3 is that even if b=MT is established in S20, c) (7/8) This is because it is executed repeatedly. In addition, (B) is the case where overtones lower than the octave are detected, and in this case, c
) (7/8) When checking XAMP (b), it becomes Y and proceeds to 824 via 823, and moves to 8TBPa.

Figure 9 shows the 70-
In 830, it is determined whether 7 lag MTl+current positive/negative flag b, and if it is normal, that is, Y, the process proceeds to 831. In 831, (1/8)c(AMP
If (b), then X is 0. In the opposite case) (=1 is set, and the process proceeds to S32.) At 832, the previous peak value AMP (1)) is stored as the current peak value C.

Then, at 833, if the current peak value C is greater than the VHL obtained in 5TEP2, the current peak value C is input to the Pep City VEI. If the opposite is true, this velocity VEL will not change. Next, 7 lag MT is rewritten to positive and negative 7 lag b this time, thereby reversing the pitch change side. This is because the meaning of 7 lag MT changes from 8TEP4, which will be described later, and means the pitch changing side. And S34
A periodic calculation of [t - TFN (b) → TP (b)] is performed. Furthermore, the previous zero-crossing time data TFN(b) is rewritten as the current zero-crossing time t.

Next, in S35, it is determined whether or not X=O, and in the case of Y, the process proceeds to 836 to check whether the frequency upper limit THLIM (previous cycle data TP (b)), that is, pitch extraction upper limit is checked, and as a result, If the period is greater than the period of the highest note, it is within the permissible range and becomes Y.
Proceed to S37. In S37, the lower limit of frequency T at the time of triggering
TLIM>Previous period data TP Check whether it is (b), that is, check the lower limit of pitch extraction, and if the period is smaller than the period of the lowest note, it is within the allowable range, and the judgment is 83.
Proceed to 8 ◎The lower limit of pitch extraction for 837 is 8TE, which will be described later.
The constant is different from the pitch extraction lower limit of P4.

Specifically, the frequency upper limit THLIM corresponds to a pitch period 2 to 3 semitones above the highest note 7th note, and the lower frequency limit TTLIM at the time of triggering corresponds to a pitch period 5 semitones below the open string 7th note. It corresponds to the period.

In step 838, the previous cycle data TP (b) is set as the previously extracted cycle data TTP, that is, the pitch extracted on the pitch extraction side is saved (this will be described later in step 8).
(used in TEP4) and proceed to 839. At 839, the previous cycle data TP (b)! =! TP (r), that is, a 1st and 5th wave pitch extraction check is performed, which is a check to see if the periods between zero crossing points with different polarities are approximately the same, and if Y, the following processing is performed in 5301. , previous zero-crossing time data TPN(S
), the time memory register TFR is rewritten, and the current zero-crossing time t is updated to the previous zero-crossing time data T.
F and clears the waveform number counter HNC. This counter is set to (MIN), and the constant TTW is set to the maximum MAX. All of these are used in 5TEP4, which will be described later.

Also, the previous peak value register AMR for relative off.
L1 is cleared.

Then, in the continuation <8310, it is judged whether the register PP is 1 or not. If it is Y, there is a possibility that a popping technique or the like was performed, so even if the first cycle information is obtained, the process proceeds to 5TEP+ without turning on the note.

If a determination of N is made in 831G, the process proceeds to 5311, and it is determined that there is no suspicion that a popping technique was used.
The note-on flag ONF is set to 2 to enter the note-on state. In the continuation <8302, the previous cycle data T
Note-on processing is performed with a normal tone at a pitch corresponding to P (b) and a volume corresponding to Beshicity VEL. That is, the microcomputer MCP instructs the sound #SS to start sounding at 830. If N is determined (zero cross point detection in the same direction), the process proceeds to 8303 and the previous peak value AMP is
(b) It is determined whether the current peak value C is reached, and if Y, the process proceeds to 5304. In 5304, the current wave height value C is set as the previous wave height value AMP (b), and the velocity V
Either EL or the value C of register C, whichever is larger, is the value VELJC77). S303.
If the result is N in any of the cases of 835.836° and 837.839, the process returns to the main routine (RET).

FIG. 18 is a diagram showing a specific example of the case where X=1, that is, abnormality, in 831. In both cases, the condition is is not satisfied, and X=1.

In other words, the peaks of the first three waveforms (“a” in diagram K18)
t be, al) may be caused by noise, but if the period of these noises is detected and the start of sound generation is instructed, a completely strange sound will be generated. Therefore, in S31, it is detected that the peak value has changed significantly, and X=1 is set, and S35
Rub I to make a N judgment. Then, in S31, after a normal change in the waveform is detected, an instruction is given to start sound generation.

In the case of FIG. 18, note-on occurs when 'I'p (b) #TP (b) is detected.

In the above-mentioned 5TBP3 (between 5TBP3→4 in Figure 11), MT=1←bSAMP (Q)←c s r
n a x [VEL sc (whichever is greater)] - + VEL, M T 4- b
= 0, TP(0)+[t-TFN(0)], TFN(
0)←tSTTP4-TP(0), TFR4-TFN
(1), TF+t, HNC←0, TTU←0(MIN
), TTW4-MAX, AMRL1←0, and PP
If not = 1, note-on condition 'l'P (0)!
=; TP (1) is processed 0 and
In this s'rgpa in response to the appropriate waveform input,
ONF←2, and furthermore, a musical tone having a pitch according to the extracted pitch starts to be generated. As is clear from FIG. 11, the sound generation instruction is given to the sound source SS after approximately 1.5 cycles have elapsed since the start of cycle detection.

Of course, as mentioned above, if the various conditions are not satisfied, there will be further delays. And if PP=1, 5TE
At P3, the sound does not start.

FIG. 10 is a flowchart of 5TEP4 shown as M9 in FIG. 4. In this case, there are a route (2) in which only pitch extraction is performed and a route (2) in which pitch is actually changed. Then, there is a route ■ which is executed when PP=l. First p
The case when P=0 will be explained below. That is, 84
00,840°841.842,863-871 will first be explained. Now, in 5400, a determination of N is made, and in S40, the waveform number counter HNC)a is determined, and in the case of Y, the process proceeds to 841.In 0841, relative on threshold value TRLRL<[
Current wave height value C - previous wave height value AMP (kb)] is judged #broom is performed, and in the case of N, 8
Proceed to step 42. In 842, this time positive and negative 7 lag b = 7 lag MT
In other words, it is determined whether or not it is the pitch changing side, and in the case of Y, the process advances to 843.

By the way, in the initial state, the waveform number counter H
Since NC is 0 (see 8301 in Figure 9), S40
Then, make a determination of N and proceed to 842.

For example, in the case of a waveform input as shown in figure tJIJ11, b=t and MT=0, so from 842 to 86
Proceed to step 3.

In 863, in order to check whether peaks of the same polarity are being input consecutively (duplicate) or not, it is determined whether the register 8 is v=1 or toe, and in the case of Y, it is sent to 868. If the result is N (not a duplicate), the process proceeds to 864, where the following processing is performed.

That is, in S64, the current wave height value C is the previous wave height value AM.
P (b), and the previous amplitude value AMRLI is input to the previous amplitude value AMRL2 for relative off processing. Note that in the present case, the content of AMRLl is O (see 830 of 8ThiP3). Furthermore, in 864, the larger value of the previous peak value AMP (r) and the current peak value C is input as the previous amplitude value AMRL1. That is, the larger peak value of the two positive and negative peak values in one cycle is set to the amplitude value AMRL1. Then, at 865, the waveform number counter HNC
) 8, and here the waveform number counter (zero cross counter not on the pitch change side) HNC is +
1 and is counted up.

Therefore, the upper limit of the waveform number counter HNC is 9. After processing in S65 or 866, the process advances to 867. At step 867, the register RIV is set to 1, the contents of the time storage register TFR, are subtracted from the current zero-crossing time, and the result is input to the period register TTR. The trick period register TTR comes to show period information as shown in FIG. Then, the current zero-crossing time [ is saved in the time memory register TFR, and after this, the main routine is returned (RUT) @ If Y at 863, the process proceeds to 868 where current wave peak value C > previous wave peak value AMP (
It is determined whether or not b), and in the case of Y, the process proceeds to 869. 8
69, the current wave height value C is the previous wave height value AMP (b)
is rewritten, and the process advances to S70. At 870, the current wave height C
> It is determined whether the previous amplitude value AMRL1 is the previous amplitude value, and in the case of Y, the process proceeds to 871, where the current peak value C is inputted as the previous amplitude value AMRLtJ.

If a determination of N is made at 868, the process immediately returns to the main routine. Therefore, the amplitude value of the new input waveform is registered only when the peak of the new input waveform is large. (In that case, it is likely that the peak of the overtones has not been detected.

Further, when the result in S70 is N, and when the processing in S71 ends, the process similarly returns to the main routine.

As described above, in the route (2), according to the example of FIG. 11, the following processing is performed. MT=OC (whichever is larger)], HNC←(HNC+1)=1, RI V
4-1, TTR+-(t-TFR), TFR
4-t 0 Therefore, the difference in time information from the previous zero-cross point of the same polarity (at 8TEP2→3) to the current zero-cross point in the period register TTR, that is, the period information has been found. Then, the process returns to the main routine and waits for the next zero-cross interlat.◎ Next, we will explain what happens when the process proceeds to route ■ shown in 5400 to 5621. Now, waveform number counter HNC=l
Therefore (see S66), execute 8400 and proceed to S4
Proceed from 0 to 842. At 842, MT=o, b= in the case as shown in FIG.

Therefore, the answer is Y and the process proceeds to S43. At 843, it is determined whether register RIV=1. Since the register RIV has already been set to 1 in route (2) (see S67), the judgment in S43 is Y in this case, and the process advances to 844.

At 844, it is determined whether register 8TEP=4, and if Y, the process proceeds to 845. At 845, it is determined whether the current wave height value is c (60H (H indicates hexadecimal notation)), and since the current wave height value is large, the result is Y, and the process advances to S46.

In 846, the amplitude value AMRL2 of the time before the previous time - the amplitude value of the previous time AMRLI ≦ (1/32) x the amplitude value AMRL2 of the time before the previous time
If it is Y, the process proceeds to 847 and the relative off counter F Ol? R, is set to 0.

This relative-off processing will be described later.

Then, at 848, period calculation is performed. in particular(
The current zero-crossing time and the previous zero-crossing time data TF) are set in the register TOTO as the current cycle information 11. The process then proceeds to S49, where it is determined whether the current period information 11) is the frequency upper limit THLIM (the upper limit after the start of sound generation), and in the case of Y, the process proceeds to S50.

8490 frequency upper limit THLIM is 836 of 5TnP3
The upper limit of the allowable range of the trigger (start of sound) frequency used in (therefore, the minimum period is 2 of the highest note 7
(equivalent to a pitch period of ~3 semitones).

Next, in S50, the following process is performed. That is, the register RI■ is set to 0, the current zero cross time t is input as the previous zero cross time data TF, the previous wave height value AMP (b) is input as the wave height value e before the previous time, and the current wave height value C is input to the previous peak value AMP (b).

After the SSO processing, the process proceeds to 851, and in 851,
Frequency lower limit TLLIM) It is determined whether the current cycle information is 1i, and if Y, that is, if the current cycle is below the lower limit of the pitch extraction range in 7-tone, the process proceeds to 852.

In this case, the lower frequency limit TLLIM is set, for example, one octave below the open string scale. In other words, 5TEP
Compared to the 30 frequency lower limit TTLIM (see 837),
The permissible range is widened. By doing this, it becomes possible to respond to frequency changes by operating the tremolo arm, etc. Therefore, only if the upper and lower limits of the frequency are within the permissible range, proceed to 852, otherwise proceed to 849 and 851. Return to main routine.

Next, in S52, the periodic data TTP is inputted into the periodic data h extracted two times before, and the current periodic information t[ is inputted into the periodic data TTP extracted last time. Then, in S53, the current peak value C is written to the velocity VEL, and in 8531 it is judged whether PP=2, and since it is now N, the process proceeds to 854. At 854, it is determined whether the no-change level NCHLV) (same peak value e before before - current peak value C) is determined, and if Y, the process proceeds to 855.

In other words, the previous wave height value of the same polarity (6=AMP(b))
If there is a large change between the current wave height value C and the current wave height value C, the difference will exceed NCyLV, and in such a case, if the pitch is changed based on the extracted period information, an unnatural pitch will occur. It is likely that changes will occur. Therefore, if a negative determination is made in S54, the process returns to the main routine without performing the processes from S55 onwards.

Next, if Y in S54, the relative off counter)'
It is determined whether OFR=0. When performing the relative off processing described later, the relative off counter F OF R is no longer 0, and even in such a case, the judgment of N is made in S55 without performing the pitch change processing (see S61). and return to the main routine. Then, when the judgment is Y in 8551C, 8
The process proceeds sequentially to 56,857.

Here, the two-wave three-value matching condition is determined. In 856, the current cycle information ttx2 >1 current cycle information t[--the cycle data h1 before the previous time is determined, and in the case of Y, the process proceeds to 857, and in 857, the current cycle information 1tX2 >1 current cycle information [11th period] The content 1 of the register TTR, is determined, and in the case of Y, the process goes to 5571. Since PP,,=0 now, a judgment of N is made in 5571 and the process proceeds to 858.

That is, in S56, the current cycle information 1t in FIG.
(see 843) is the previous cycle data h (=TTP) (
S57).
Then, it is determined whether the current value of the period information 11 substantially matches the period TTR which overlaps it by ζ times. Note that the limit range is set to 2 Xtt, and the value changes depending on the period information. Of course, this may be a fixed value, but better results can be obtained with the technique adopted in this embodiment.

In the next step 858, it is determined whether the current cycle information it>constant TTU, and if Y, the process proceeds to 859, and here it is determined whether the current cycle information 11<constant TTW, and if Y, the process proceeds to 860.

These judgments 858 and 859 are made to not allow sudden pitch changes. In other words, the constant TTU of S58 is 5TE
It is now set to 0 at 8301 in P3, and the constant TTW is similarly set to M.
The value of AX is set as the value of AX, and when passing through this flow for the first time, Y is always determined at 858, 859, but after that, at 862, which will be described later, the constant TTU is set to (17/
32) t t (period information of approximately one octave treble) is set, and the constant 'K''rWlc is similarly set to 862iC (3
1/16)it (period information of approximately one octave bass tone) is set. Therefore, it is possible to suddenly go up an octave (this happens when you perform a minito operation by releasing the seventh note and placing your finger on the center of the string vibration) or down an octave (this happens when you miss the peak of the waveform). etc.), changing the pitch will look unnatural, so branch so as not to change the pitch.

If a determination of Y is made in steps 858 and 859, the process proceeds to step 860. At 860, it is determined whether register 8TEP=4, and if Y, the process proceeds to 861. 8
61, pitch change from microcomputer MCP to sound source SS (
(based on the current cycle information 11) is performed, and the process proceeds to S62, where the time constant is changed in accordance with the current cycle information 11.
Also, the constant TTU is (17732)
Further, the constant TTW is rewritten to (31/16)X current cycle information 11.

That is, as will be described later, 8'['BP=5 only when relative off processing is performed, but in that case, the time constant is changed without changing the pitch.

This time constant change processing means that the MyFun MCP sets data based on the value of the current cycle information 11 in the register inside the time constant conversion control circuit TCC shown in FIG. This is as already explained.

Following the process of S62, it is judged whether the value of the register PP is 2 or not, and since it is now N, the process returns to the main routine. Therefore, as described above, in the loop F2, the following processing is performed as shown in FIG. That is, HN
C=1, M'r=0=b.

RI V = l, F OF R4-0, t t←
(t-'rF).

RIV4-0, TF4-t, e←Person MP (0)
, AMP (0)60% h+TTP, TTP+-t
tNVEL+c, and ■TTP! qTTR#lt.

■TTU(tt(TTW.

■AMP (0)-c<NCHLV When the 03 condition is satisfied, the pitch is changed according to 11. After that, TTU←(17/32)Xt t.

TTW4- (31/16) X t t Kaf! stL
;5° Therefore, in the root ■, the pitch change is performed on the actual sound source SS, and in the following zero cross interwoven, the process of the root ■ is performed.Similarly, in the subsequent zero cross interwoven, the processing of the root ■ is performed. Then, in root ■, simply extract the period (see S67).
Then, actual pitch change (see S61) and time constant change processing (see S62) will be performed.

In addition, at 840 in 8TEP4, after the waveform number counter HNC is counted up so that it exceeds 3 at 866 in route (2), a determination of Y is made, and then the process goes to 841 to detect a relative-on condition. This means that C-person MP(b)>'rRLRL, and the current amplitude value is the threshold T compared to the previous amplitude value AMRL1.
This happens when the KL increases beyond KL, that is, when the same string is picked again after string manipulation (such as by tremo p playing), in this case it is 84.
Continuing with step 1, proceed from step S41 to step 8 to process the relative on.
78, the time constant change register CHTI(, 1) of the time constant conversion control circuit TCC is set to the period CHTIM of the highest note 7th note (for example, 227th note).Then, the process proceeds to 806 in FIG. After note-off of the musical note inside, it starts playing again.

According to normal performance operations, the process proceeds to steps 840, 841, and 842, and then proceeds to the above-mentioned route (2) or route (3).Next, referring to FIG. 12, the processing when a popping performance is performed will be explained.

According to the above-mentioned rebopping performance technique, the polarity of one side of the input waveform signal, in this embodiment, the peak of the negative side polarity becomes α>β>r as shown in FIG. Therefore, 8
During the processing of TEP2, PP is set to 1, CHTRR is set to T P (0), and AMP (G) is set to C.

And at 8TBPa, if PP=1, TP(0)=T
Even if it is P (1), proceed to 8TEP4 without note-on.

Then, at 8400 of 13P4 (ST in Figure 10), a determination of Y is made and the process goes to route ■. This route ■ is 8
It is a routine that starts with 401, and first starts with 5401.
Then, it is determined whether b=1 or not, and in the case of processing related to the zero-crossing point immediately after the positive peak, it is not possible to judge the popping playing style, etc.:, the determination at 54Ot is Y and the process returns to the main routine (RBT).

If the processing is related to the zero-crossing point immediately after the negative peak, a judgment of N is made in 8401 and the process goes to 5402. In 5402, it has already been determined that there is a high possibility that the current picking is due to a popping playing style, etc. Because there are
After that, the value of the open string period CHTIO is set in the register CHTRR for period measurement.

Then, in continuation <8403, it is judged whether c) AMP (0). If a determination of Y is made in this 8403,
Assuming that no popping technique was used, the process proceeds to 8404, sets the register PP to O to mean that no popping technique was used, and starts generating the selected tone from the sound source SS.

On the other hand, when a judgment of N is made in 8403 (that is, when the relationship α>β>r holds true as shown in FIG. 12), the process advances to 5405 and a predetermined sound (PP sound The sound source SS is instructed to generate the following:

This predetermined sound (PP sound) is preferably a sound in which a specific pitch cannot be sensed, such as a noise sound, a percussion sound, or a sound modulated using noise. This is because the popping method is a playing method that generates sound by hitting the strings or pulling the strings and then releasing them. In any case, @1
If a scale tone is generated based on the period of TP (0) - TP (1) of 211, it will be different from the string vibration period X ``Q 7 '' i Z for the 7th let that will be extracted later. This would require an unnatural cycle change. Therefore, according to this embodiment, a predetermined sound (PP sound) as described above is generated before the original scale sound is generated, and then the original scale sound is changed (for example, the scale sound gradually changes). change).

Now, following this 8405, proceed to 8406, set register PP to 2 to indicate that a predetermined sound (PP sound) has occurred, then set 7 lag ONF to 2, and proceed to the main routine. Return.

Therefore, in the main routine processing following the next interwoven processing, a judgment of N is made at 8400 in 5TEP4, and the processing of route (2) or route (2) described above is executed.

By the way, in this route (2), since register PP=2 in 8531, the process goes to S55 without going through 854. This is because, according to the popping playing style, the input waveform signal level fluctuates rapidly, so the judge e - c (N at 854) is often N in CHLM.
There is a high possibility that pitch extraction will be delayed. Therefore, when PP=2, this 854 is bypassed and the process goes to the next 855.

Similarly, in 8571, when PP=2, a Y judgment is made and the process directly proceeds to 860 without going through 858 and 859.

Also, according to the popping technique, etc., there is a high possibility that the pitch change will appear suddenly as shown in Figure 12.
, 859, there is a high possibility that pitch extraction will not be possible, so these processes are bypassed and the process proceeds to S60, and after executing steps 860 to 862,
Then, the process goes to 5622. At 8622, the register PP is set to O, and then the process returns to the main routine.

By the way, in the example shown in FIG. 12, when it becomes s'rgp4 and it is detected that the periods x, y, and z substantially match, (
856, 857), the pitch is changed to the original 7-let period for the first time (see S61).

The subsequent processing operations of each 74- are as described above, and the operations of route (2) and route (2) are repeatedly executed.

Next, relative off processing will be explained with reference to FIGS. 13 and 14. In other words, when moving from the state where the 7-let operation is being performed to the open string state, the amplitude level of the waveform drops rapidly, and the difference between the previous wave height value AMRL2 and the previous wave height value AMRL1 is (1/32) AMRL2. When the value exceeds the value, the process proceeds from 846 to 874. Then, the process proceeds from 874 to 875 so that the relative off counter FOFB counts up by a length exceeding the constant ROFCT.
At this time, the process goes from S75 to 848 and processes 849 to 855 are performed, but since FOFR=O is not established, the process returns to the main routine without changing the pitch immediately before entering the relative off process.

If it is determined Y in S74, that is, in the example of FIG. 13, when the value of FOFR becomes 3 (ROFCT is 2
), go from 874 to 875.

However, if the judgment in S46 is Y even once, the process proceeds from 846 to 847 and the POFR is reset. Therefore, unless the condition 846 is satisfied the number of times specified by ROFCT, relative off processing is not performed.

Note that if the value of ROFCT is set to a large value for strings with high pitches, relative off processing can be performed for any string after an approximately constant time 0. Then, when going from S74 to 876, the relative off counter FOFR is set to 0. is reset, register 8TEP is set to 5, and the process proceeds to 877 to instruct note-off to sound source SS. This 5TEP
is 5, the pitch extraction process is executed in the same way as in 5TBP4, but S60 to S861 are not performed.
62, the pitch is not changed for the sound source SS. However, the time constant change process is performed according to the period extracted in S62.

When 5STEP is 5, Relative ON processing is accepted (841, 878), but in other cases, it is detected that the vibration level has decreased in the main 74- of Fig. 4. 8TE with M14 by
P becomes 0 and returns to the initial state.

In addition, AM几Ll and AM几L2 used in 846 are 86
4, and the peak with the highest level in one cycle (one of the f & large peak and the minimum peak) is set to this value, and in the example in Figure 14, the maximum peak ay is the minimum Beak bK-1 is always larger than s anal
and 8m+1 Sa! The differences between l+1 and amam and between anal and ao+4 are all set to exceed predetermined values.

Also, at this time, in the process i of route ■, the most tJz
k'-ri bust % b! Since the L+x s buds force S has decreased by the extreme ξ, a determination of N is made in S54, the process returns to the main routine, and no pitch change processing is performed.

Next, we will explain the processing based on the case that during pitch extraction, overtones in an octave relationship, that is, sounds an octave higher or an octave lower, are successively detected.

As already explained, in S58, when 11 does not exceed TTU, that is, when it becomes smaller than the value TTU multiplied by 17/32 of the previously extracted period, the process proceeds to 876. In other words, when a note an octave higher is extracted, it is treated as a mute operation such as removing your finger from the specified 7th let and pressing the center of the vibrating string with your finger, without outputting a note an octave higher. , go from 858 to 876,
Similar to when relative is turned off, the previous sound generation is stopped by processing 876.877.

Also, in S59, when it failed to complete TTW,
In other words, when the value is greater than the value TTW, which is 31/16 times the previously extracted cycle, the process returns to the main routine without proceeding to 860.

This state is shown in FIG. Normally, when the waveform is very small near note-off 1. The waveform is picked up by other pickings due to the crossed oak of the hex pickup or the resonance of the body.

Then, for example, the input waveform becomes as shown in Fig. 15, and 1
Input waveforms that are an octave lower may be detected continuously.◎ In such a case, unless some processing is performed, the sound that is an octave lower will suddenly be output, which will be extremely unnatural. Therefore, Tan41-T a n+ at 857,856
Even if l'Q T, b 3+z is detected, 'ran
+s) T bust X (31/16), so the process returns to the main routine from S59 without changing the pitch.

Next, a case where a double waveform is extracted, that is, a case where zero x ps points of the same polarity arrive successively will be described. FIG. 16 shows an example when MT=1, and since the fundamental wave period and the period of the harmonic component are in a non-integer multiple relationship,
The phase of the overtones will shift and you will end up detecting zero crosses of the same polarity, so you have to be careful not to make incorrect pitch changes.

Therefore, 5TB at the time of Zep cross, which is written as double in the diagram.
In the process of P4, the process goes from 842 to 843, and in S43, a determination of Y is made, and the process goes to 872. Here, an+3 and an
The magnitude of +2 is compared, and if 3m+3 is greater than an+1, a decision of Y is made at 872, and AMP (1)
Set the value of 3m+3 to , and if the opposite is true, do not change the number of ships.

By the way, in this case of duplication, the extracted time data is not used, so the cycle information Ta+3 does not change at all. Also, of course, the pitch is not changed based on the periodic data.

Similarly, FIG. 17 shows an example of waveform duplication, where MT=
The state of O is shown. At this time as well, a state of overlap occurs at the locations indicated as overlap in the figure. In this case, go to 863 from S42, make a Y decision, and go to 868.
go to 868, in this case! In+2 and an+8
Compare with , and go to 869 only when 3m + 3 is greater than an + snow and rewrite AMP (1). In this case, the previous amplitude value AMRLI is further compared with the current amplitude information (peak value C) at 870, and if Y, 871
The current amplitude information C is set to the previous amplitude value AMRL1.

In this way, even if the waveform is doubled due to the influence of overtones, pitch change processing will not be performed unless 856 and 857 are satisfied.

In this way, according to this embodiment, it is possible to detect that a popping playing technique has been performed by detecting that a fixed polarity peak on one side, that is, a negative peak in this embodiment, appears at the start of string vibration, and two peaks occur in succession. In such a case, a musical tone with a tone whose pitch is difficult to judge will be detected until the period corresponding to the original 7-let operation is detected. This makes it possible to prevent unnatural pitch changes from occurring at the start of sound production. Moreover, it becomes possible to generate a unique sound in accordance with changes in the performance state.In addition, in the above embodiment, the period is extracted from the interval of each zero cross point after the maximum peak point and the minimum peak point. However, other methods may be used, for example, period extraction may be performed from the time interval between maximum peak points or between minimum peak points.

Further, the circuit configuration can be variously changed accordingly.

Furthermore, in the embodiment described above, the present invention was applied to an electronic bass guitar (pace guitar synthesizer), but this is because popping techniques are often used. However, the musical instruments to which the present invention can be applied are not limited thereto. The present invention can be applied to a variety of musical instruments or devices that perform pitch extraction and generate an acoustic signal different from the original signal.

〔Effect of the invention〕

As described in detail above, the present invention is such that the change in the peak level on the predetermined polarity side detected by the level detection means decreases sequentially a predetermined number of times at the start of input of an input waveform signal generated in conjunction with string vibration. In such a case, the determining means determines that a popping technique, etc. has been performed, and generates a predetermined tone different from the scale note, especially a sound with no perceived periodicity, to create a sound suitable for performing operations using the popping technique, etc. can occur.

Therefore, when performing a popping technique, etc., a sound different from the scale note is generated, which improves the performance effect, and even if you switch to generating the corresponding scale note by extracting the original period by the 7-letter operation, it will be unnatural. There will be no more.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of a human-powered control device for an electronic stringed instrument according to the present invention, FIG. 2 is a block diagram showing an example of the pitch extraction digital circuit of FIG. 1, and FIG. 74-chart showing the interrupt processing routine of the microcomputer in Fig. 2, Fig. 7a-chart showing the main processing routine of the microcomputer in Fig. 2, Figs.
Figure 0 is used to explain the operation of each step of the microcomputer in Figure 2). 81M, FIGS. 11 to 18 are timing charts for explaining the operation of each step. FA...Pitch extraction analog 4G circuit, PD...Pitch extraction digital circuit 1 M0P...Microcomputer, 88...Sound source, PEDT.
...Peak detection circuit, ZT8...Zegger time acquisition circuit, TCC...Time constant conversion control circuit, PvS...Peak value acquisition circuit.

Claims (1)

[Claims] Detecting that a popping playing style or a pulling playing style has been performed,
An electronic string instrument configured to generate a predetermined sound different from a scale tone, the electronic stringed instrument comprising: a level detection means for detecting a peak level of an input waveform signal generated with string vibration; and a predetermined sound detected by the level detection means. a determining means for determining that the popping or pulling technique has been performed when the change in the peak level on the polar side sequentially decreases a predetermined number of times at the start of inputting the input waveform signal; An electronic stringed instrument characterized by comprising: instruction means for instructing generation of the predetermined sound when it is determined that the popping playing style or the pulling playing style is performed.