JPS5919346B2 - ensemble effect circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ensemble effect generating device for use in an electronic musical instrument.

Conventionally, as a means/method for adding an ensemble effect used in electronic musical instruments, the frequency of the original musical tone signal is continuously modulated by modulating the delay time of the input musical tone signal using a plurality of sine waves with equal phase intervals as a modulation signal. A musical tone signal that repeatedly changes was created and mixed to create an ensemble effect. In this case, the modulation period is 1
Although the frequency is low (seconds to five seconds), each modulated musical tone signal is filled with signals subjected to viprato, and since the phase intervals of the modulated signals are equiangular, the feeling of viprato cancels each other out. , I could mainly hear the ensemble sound effect, but it did not completely cancel out the viprato feeling, and I was unable to obtain a fully satisfactory ensemble effect. The present invention
It is an object of the present invention to provide an ideal ensemble effect generating device that solves the drawbacks of the conventional examples described above.

The configuration of an embodiment of the present invention using four delay time modulation circuits will be described below with reference to the drawings. In the circuit diagram of the device according to the invention shown in FIG. 1, the output musical tone signal Gs of a musical tone signal source G is fed into delay circuits 1, 4, 2, 3.

These delay circuits are driven by carrier oscillators 01, 04, 02, and 03 that are frequency-modulated by triangular waves X, Y, ,Y, These signals are applied to switching circuits 5, 54, 5, , 5, each having two switching contacts a and b, but each of these switching circuits has a phase difference of 900 degrees with respect to the other and generates a triangular wave X. , Y, X, square wave P with the same frequency as Y,
It can be switched by Q, P, and Q. In other words, the square wave...
When the level is high, the contact is closed to the a side, and when the level is low, the contact is closed to the side. The sum Mli of each output signal when the contact of the switching circuits 5, , 5, is closed to the a side is sent to the amplitude modulator M1, and the sum M2l of each output signal when the contact is closed to the b side is sent to the amplitude modulator M1. are applied as inputs to width modulators M, respectively. Also, the sum M,i of each output signal when the contacts of switching circuits S3 and S4 are closed to the a side is sent to the amplitude modulator M4, and the sum MSi of each output signal when the contacts are closed to the b side is sent to the amplitude modulator M4. They will be applied as inputs to the amplitude modulators M, respectively. Amplitude modulators M, , M, are triangular waves X, Y
, X, Y, and the amplitude modulators M, , M4 are subjected to nearly 100% amplitude modulation by a sine wave S having a phase difference of 180° from the sine wave S. Each amplitude modulator Ml, M, , M3,
The input signals Mll, M2l, M3l, and M4l of M4 are amplitude modulated according to the sine waves S and S. amplitude modulators M1 and M,
The output signals M1' and Mj of the amplitude modulators M2 and M are led to the output terminal A1, and the output signals M,' and M,' of the amplitude modulators M2 and M, are led to the output terminal A2. Also, the output Gs of the musical tone signal source G is output from the output terminal AO.
These three output terminals A. , A, , A2. Next, the operation of the circuit diagram of FIG. 1 will be explained using the waveform diagram example of FIG. 2.
The waveform of the output musical tone signal Gs from the musical tone signal source G in FIG. 1 is shown at 1 in FIG. Carrier oscillator 01 in Figure 1
, 04, 02, 0, modulation waveforms X, Y,
X and Y are triangular waves having a phase difference of 9' from each other, as shown by 2, 9, 4, and 7 in FIG. 2, respectively. Therefore, the musical tone signal Gs deviates to the higher side during the time period when the slope of the triangular wave corresponds to the upward slope to the right, and conversely deviates to the lower side during the time period when the slope of the triangular wave corresponds to the downward slope to the right, resulting in the delay shown in Fig. 1. Each output Gs, , Gs4, Gs of circuits 1, 4, 2, 3
2, Gs, are 12, 17, 13, and 16 in Figure 2, respectively.
The switching circuit Sl of FIG. 1 has a waveform as shown in FIG.
, S4, S, , Ss. These switching circuits generate square waves P, Q, F, "Q (triangular waves X, Y,
As shown in Figure 2, 3, 10, 5, and 8, each of the triangular waves
, Y, It is set as. Switching circuits S,, S4, S2. Since SS closes to the contact a side during the high level time of these square waves and to the contact b side during the low level time, the amplitude modulators Ml and M4 in Fig. 1
, M,, input signals to M3 Mli, M4l, M2l, M
, i are the input signals Mii, M to the amplitude modulators Ml, M4 as shown at 14, 19, 15, 18 in FIG.
4l is only a signal whose frequency is biased higher than that of the musical tone signal Gs, b, an input signal M2l, to the amplitude modulator M2, M,
For M, i, only a signal whose frequency is biased lower than that of the musical tone signal Gs is obtained. The amplitude modulators Ml, M2 and M3, M4 shown in FIG.
An amplitude modulation close to F6 is performed, and the modulated wave S has twice the frequency of the triangular wave X, Y, X, Y or the square wave P, Q, P, Q, and has a phase difference of 180° from each other. Since the output waveforms are sine waves, the output waveforms M1', Mj, M2', M,' of the modulators M1, M4, M2, and M are as shown in 20, 21, 22, and 23 in FIG. 2, respectively. . Among these outputs, outputs MJ and Mj of modulators M1 and M4 are output terminals Al.
As shown in FIG. 2, the frequency changes to the musical tone signal Gs.
A signal appears with a constant frequency and amplitude that is biased higher than , and the outputs M2' and M3' of the modulators M, and M,
is led to the output terminal A2, and a signal having a constant frequency and amplitude whose frequency is biased lower than that of the musical tone signal Gs as shown in FIG. 25 is output. These two output signals or the two output signals and the output Gs of the musical tone signal source G guided to the output terminal AO are acoustically or electrically mixed to produce an ensemble effect. The amplitude modulators Ml, M2 and M, , M4 each apply amplitude modulation to the sine wave S, which is close to 100 (F6), as described above, but the switching circuit determines the point at which the amplitude of the amplitude modulation becomes the minimum. Since the switching points of Sl, S, ,S, ,S, are made to coincide with each other, each output signal GSl, GS4, GS2, GS, of delay circuits 1, 4, 2, and 3 is controlled by the switching circuit. It is possible to suppress the distortion that occurs at the switch-connected joints (points K in FIG. 2 14, 15, 18, and 19) and prevent click noises.As described above, the present invention has at least four delay circuits each. , a switching circuit for distributing signals, and an amplitude modulation circuit.
The phase-shifted triangular wave is modulated to change the delay time of each of the delay circuits, and among the musical tone signal outputs of the respective delay circuits, only the signals whose delay times change in the same direction are synthesized. After switching with the switching circuit,
By matching the switching point with the point in time when the amplitude of the amplitude modulation approaches O, the output terminal of the circuit configuration electrically or acoustically mixes the original musical tone signal or each other. 2 whose frequency is slightly shifted above or below the original musical tone signal, which can produce an ensemble effect.
This is an ensemble effect circuit configured to obtain two output musical tone signals, and since the output musical tone signal of the ensemble effect generator of the present invention maintains a constant frequency, it cannot be completely removed by conventional methods. It has the advantage and characteristics of eliminating the vibrato feeling and obtaining a sufficiently satisfying ensemble effect.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the ensemble effect generating device according to the present invention, and FIGS. 2 1 to 25 are explanatory diagrams showing waveforms at various points in FIG. 1. G... Musical tone signal source, Gs... Musical tone signal, 1, 2, 3, 4... Delay circuit, 01, 02,
0,,0,...Carrier oscillator, A, b...
...Switching contact, Sl, S2, S3, S4...
Switching circuit, Ml, M2, M,, M4...
・Amplitude modulator, X, X, Y, Y...Triangular wave modulation wave, Gsl...1 output signal, Gs2...
...2 output signal, Gs3...3 output signal, Gs4...4 output signal, S, 100...
・Sine wave modulation wave, P, P, Q, (... square wave, AO, Al, A2... output terminal, M/...
...M1 output signal, M2'...M2 output signal, M3 (...M3 output signal, M4/...
...M4 output signals Mll, M2l, M3l, M4l
...Input signals of Ml, M2, M, , M4, respectively.

Claims (1)

[Claims] 1 connected in parallel with a common musical tone signal input terminal,
The phase difference between the triangular wave modulation signals for delay time modulation is 9
At least four delay circuits set at 0° are connected in series to each of the delay circuits, and the output signals from each of the delay circuits are switched and distributed at the peaks and troughs of the triangular wave. Among these, there is a switching circuit that synthesizes only signals whose delay time changes in the same direction, and a switching circuit that is installed corresponding to each switching circuit and receives the synthesized signal from the switching circuit and modulates the switching point of the switching circuit for amplitude modulation. and an amplitude modulation circuit set to match the valley of the signal, and obtain an ensemble effect by electrically or acoustically mixing with the original musical tone signal or with each other from the output side of the amplitude modulation circuit. An ensemble effect circuit capable of obtaining two output musical tone signals whose frequencies are slightly shifted above or below the original musical tone signal.