JPH0467198B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vibrato signal generation device, and more particularly to a vibrato signal generation device capable of generating a delayed vibrato signal with a simple configuration.

Conventional configurations and their problems Conventionally, delay vibrato signals have been generated using analog processing that controls the oscillation state of a vibrato oscillator using the charging (or discharging) characteristics of a capacitor, or using vibrato waveform 1.
Using a memory that stores the period and a shifter that performs (1/2 m) shift processing, the output signal of the memory is supplied to the shifter, and the shift state (m = 8, 7, 6..., 1, 0) is set for each period of the vibrato waveform. ) has been proposed to generate a delay vibrato signal, but analog processing is difficult to implement on an LSI, and if a shifter is used, the shifter circuit size will be large. It had some problems.

OBJECTS OF THE INVENTION An object of the present invention is to provide a vibrato signal generating device that generates a delay vibrato signal with a simple configuration.

Composition of the Invention The vibrato signal generating device of the present invention includes a vibrato memory that stores vibrato waveforms of a plurality of different periods, and a data read control section that sequentially reads out the vibrato waveforms of a plurality of periods stored in the vibrato memory and repeatedly reads out the final vibrato waveform. and is configured to generate a vibrato signal.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a configuration diagram of an embodiment of the present invention. In the figure, 1 is a vibrato memory that stores vibrato waveforms of different multiple periods in the form of PCM, 2 is a main oscillator, 3 is an N counter that generates sample number n within one period of vibrato waveform, and 4 is a vibrato waveform of multiple periods. 5 is an I counter that generates a waveform number i representing the waveform currently in use; 5 is a detector (I-1) that detects the final waveform number of the vibrato waveform stored in the vibrato memory 1; 6;
7 is an AND gate, and 8 is a NOR gate.

Explanation of storage contents of vibrato memory 1 The vibrato memory 1 stores N waveform samples obtained by dividing one period of the vibrato waveform into N (n=0, 1, ..., N-1) for I periods (i =0, 1,
..., I-1), that is, N×I waveform samples (X _i,o ) are stored. In this embodiment, N=64 and I=8 will be explained. Furthermore, data corresponding to the vibrato off state, that is, (0) ₁₀ , is stored in the waveform sample (X ₀ , ₀ ).

Explanation of signals KON, DVIB, VIB Signal KON is “1” when the key switch is on.
and becomes “0” when in the off state,
Signal for 8-note polyphonic electronic musical instrument
KON can be expressed by the following theoretical formula.

KON=(KON ₁ +KON ₂ +...+KON ₈ ) Signal DVIB is "1" when the delay vibrato switch is on, and "0" when it is off.
becomes.

Signal VIB is "1" when the vibrato switch is on, and "0" when it is off.

Next, the operation of FIG. 1 will be explained.

When the signals DVIB="0" and VIB="0" When the signals DVIB and VIB are both "0",
The output signal of NOR gate 8 becomes “1”, and N
“1” in input RS of counter 3 and I counter 4
is supplied to reset the N counter 3 and I counter 4.

Then, the output signal n of the N counter 3 will always be n=0. Further, the output signal i of the I counter 4 is always i=0.

As a result, the waveform sample (X _i,o ) read from the vibrato memory 1 becomes (X ₀ , ₀ ), and the vibrato is turned off.

When signal DVIB="0" and VIB="1" When signal VIB becomes "1", the output signal of NOR gate 8 becomes "0" and "0" is supplied to the input RS of N counter 3 and I counter 4. Then, the reset state is released and the count state is entered.

Then, based on the output signal of the main oscillator 2, the N counter 3 increments (n=0→1→2→...
→N-2→N-1; N=64). Then, n=N-1 (63), and at the next step timing, n=0, and a clear signal is output from the output CO.

The carry signal output from the output CO of the N counter 3 is supplied to the input IN of the I counter 4 via the AND gate 6, and when the carry signal is generated,
Increment of I counter 4 (i=0→1→2...→I
-1; I=8).

Then, the output signal of I counter 4 is i=I-1
When the step advances to (I=8), the output signal of the (I-1) detector 5 becomes "0", and the AND gate 6
The output signal is always "0" and the I counter 4 stops incrementing.

As a result, based on the output signals of the N counter 3 and the I counter 4, the waveform number i=0→i=1→i=2...i=I-1 is stored in the vibrato memory 1.
The vibrato waveforms in (7) are read out sequentially. And the waveform number i=7 which is the final waveform
In this case, the vibrato waveform of waveform number 7 will be read out repeatedly.

When signal DVIB="1" and VTB="0" When signal KON="0", the output signal of NOR gate 8 becomes "1", and the waveform sample (X _i,o ) becomes (X ₀ , ₀ ), and the vibrato is turned off.

When the signal KON changes from “0” to “1”,
The output signal of AND gate 7 becomes “1”,
The output signal of NOR gate 8 is from “1” to “0”
become. Then, as in the case described above, the vibrato waveforms stored in vibrato memory 1 are read out sequentially (waveform number i = 0 → 1
→2→…→I-1(7)), generates a delay vibrato signal, and generates the final vibrato waveform (i=
Read out 7) repeatedly.

Then, the signal KON changes from “0” to “1” again.
When the signal changes to , the same processing as described above is performed and a delay vibrato signal is generated.

In addition, the capacity MDC of vibrato memory 1 is
MDC=NXI=64×8=512 words, and if one word is composed of 8 bits, MDC=4096 bits.

In this way, the delay vibrato signal generated in multiple cycles is stored in the vibrato memory 1, the vibrato waveforms of multiple cycles are sequentially read out in response to the signal KON, and the final vibrato waveform is repeatedly read out. Since the configuration is configured to generate a signal, there is no need for a shifter, which is a large circuit element, and generation of a delay vibrato signal can be realized with a relatively simple circuit configuration.

In addition, the delay vibrato signal can be created by storing not only waveforms with different amplitude levels for each period, but also vibrato waveforms with different waveform shapes and amplitude levels in the vibrato memory 1.
A delay vibrato signal that changes in a complex manner can be generated.

FIG. 2 shows a configuration diagram of another embodiment of the present invention.
Components having the same functions as those in FIG. 1 are given the same reference numerals, and their explanations will be omitted.

In Fig. 2, 9 is a vibrato memory that stores vibrato waveforms of different multiple periods.
It stores waveform samples converted into PCM (D(X _i,o ) = (X _i,o −X _i,o-1 )). 10 is an accumulator.

In the vibrato memory 1 in Fig. 1, the vibrato waveform was stored in the form of PCM ((X _i,o )).
The vibrato memory 9 in FIG. 2 stores the vibrato waveform in the form of differential PCM, and the accumulator 10 performs the accumulation process ((X _i,o ) = (X _i,o-1 ) + D
(X _i,o )) to restore a PCM-form vibrato waveform, and the data capacity of the vibrato memory 9 can be reduced.

FIG. 3 shows a configuration diagram of another embodiment of the present invention.
Components having the same functions as those in FIG. 1 are given the same reference numerals, and their explanations will be omitted.

In FIG. 3, 11 is a vibrato memory;
2 is an accumulator, 13 is a K counter, and 14 is an L counter.

The vibrato waveform stored in the vibrato memory 11 is data D(X _i,l )/K obtained by dividing one cycle of the vibrato waveform into L parts and 1/K the difference value between each dividing point. The relationship with the vibrato waveform divided into N parts stored in the vibrato memory 1 in FIG. 1 is shown below.

(X _i,o )=(X _i,l )+(D(X _i,l )/K...(1) N=L+K, n=0,1,..., N-1, l=0, 1, ..., L-1 In Fig. 3, when the output signal of the NOR gate 8 changes from "1" to "0", the K counter 13,
The L counter 14 and I counter 4 change from the reset state to the counter state.

Then, depending on the output signal of the main oscillator 2,
The K counter 13 is incremented and the increment state is (K-
When the value changes from 1) to (0), a carry signal is supplied from the output CO to the input IN of the L counter 14, and the L counter 14 is incremented. From then on, K counter 1
Every time a carry signal is output from the output CO of 3,
The L counter 14 is incremented. When the progress state of the L counter 14 changes from (L-1) to (0), a carry signal is sent from the output CO to the AND gate 6.
is supplied to the input IN of the I counter 4 representing the vibrato waveform number, and the I counter 4 is incremented. Thereafter, the I counter 4 is incremented every time a carry signal is output from the output CO of the L counter 14. Then, the progress state of the I counter 4 is (I
-1), as in FIG. 1, (1-1) the output signal of the detector 5 becomes "0" and the I counter 4 stops incrementing.

Data based on the output signals of the L counter 14 and the I counter 4 is read from the vibrato memory 11 and supplied to the accumulator.

The accumulator 12 performs accumulation processing using the data read from the vibrato memory 11.
Restore the vibrato waveform (X _i,o ) in the form of PCM.
Note that for K samples of the vibrato waveform, the progress states of the L counter 14 and I counter 4 do not change, and the data read from the vibrato memory 11 is the same, and by accumulating using the same data for K samples, Perform the calculation of equation (1) above,
The vibrato waveform in the form of PCM can be restored.

In this way, one period of the vibrato waveform is divided into L parts, and the data obtained by dividing the difference value between each division point by 1/K is stored in the vibrato memory 11, and the same data for K samples of the vibrato waveform is read out and the accumulation process is performed. By doing this and generating a vibrato waveform in the form of PCM, the capacity of the vibrato memory can be further reduced.

Patent Application No. 57-231482 ``Musical Tone Generator'' using the vibrato signal generator of the present invention
This includes the notebook clock generator used in

Figure 4 shows patent application No. 57-231482 “Musical tone generator”
This figure shows a configuration diagram of the main parts of the notebook clock generating section.

In FIG. 4, 801 is a main oscillator, 802 is a sequencer, 804 is a timer, 805 is a comparison register section, 806 is a frequency data processor (FDP), and 810 is a calculation request flag generation section.

The output signal of the timer 804 and the frequency data supplied from the FDP 806 are compared, and if a match is detected, a match pulse is supplied from the comparison register 805 to the calculation request flag generating section 810. A note clock signal is generated by updating the frequency data at a predetermined timing based on the sequencer 802. The formula below shows how to update frequency data.

NFD = MOD (OFD + PD, TD _nax ) NFD is new frequency data OFD is frequency data before update PD is scale data determined by the scale of occurrence, for example, for C note, (478) ₁₀ TD _nax is the number of output states of the timer 804,
TD _nax = 2 ¹⁰ , that is, (1024) ₁₀ .

And in FDP806, sequencer 802
Based on this, the calculations shown in the following formula are performed in sequence to obtain data PD and update the frequency data.

CPD=CPD+CVD CPD=CPD+CGD CPD=CPD+CBD PD=EXP(CPD)+△EXP(CPD) NFD=OFD+PD CPD is scale data on the cent scale CVD is vibrato data on the cent scale CBD is cent The beat data on the scale, PD is scale data directly proportional to the frequency. In the above formula ~, add the data on the cent scale, and in , perform exponential conversion processing to find the data PD that is directly proportional to the frequency, Frequency data is updated in the step 1, and a note clock signal with a vibrato or glide effect can be generated.

Therefore, the vibrato signal generated by the vibrato signal generating device of the present invention can be used as the data CVD in the above formula.

Incidentally, the increment processing of the N counter 3, I counter 4, K counter 13, and L counter 14 explained in FIGS. 1 to 3 is also performed based on the sequencer 802.
By performing this within the FDP 806, the elements constituting the counter can be realized by +1 addition using a register and an adder within the FDP 806, making it possible to reduce the circuit scale.

Effects of the Invention As explained above, the vibrato signal generating device of the present invention includes a vibrato memory that stores vibrato waveforms of a plurality of different periods, and a vibrato waveform that sequentially reads out the vibrato waveforms of a plurality of periods stored in the vibrato memory and generates a final vibrato waveform. It is equipped with a data readout control section that repeatedly reads data, and is configured to generate a vibrato signal.
A shifter, which is a large circuit element, becomes unnecessary, and a delay vibrato signal can be generated with a relatively simple circuit configuration.

Furthermore, by storing vibrato waveforms with different waveform shapes and amplitude levels in the vibrato memory for each period, a delay vibrato signal that changes in a complex manner can be generated.

[Brief explanation of the drawing]

FIGS. 1 to 3 are block diagrams of embodiments of the present invention, and FIG. 4 is a block diagram of essential parts of a note clock generating section in which the vibrato signal generating device of the present invention can be used. 1, 9, 11...vibrato memory, 2...main oscillator, 3...N counter, 4...I counter,
6, 7...AND gate, 8...NOR gate, 1
0, 12...accumulator, 13...K counter, 14
...L counter.

Claims (1)

[Claims] 1. A vibrato signal comprising: a vibrato memory that stores vibrato waveforms of a plurality of different periods; and a data read control section that sequentially reads out the vibrato waveforms of a plurality of periods stored in the vibrato memory and repeatedly reads out the final vibrato waveform. Generator.