JPS5930273B2 - ensemble effect circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit system for adding various tone effects and ensemble effects to musical tone signals.

According to the present invention, it is not only possible to convert a single note into an arbitrary pitch, but also a complex musical tone such as a chord can be converted into an arbitrary pitch, and the original sound and the converted sound can have a very rich timbre. A great ensemble effect can be obtained.

The circuit operation will be explained below with reference to the drawings. Figure 1 shows
FIG. 1 is a circuit block diagram showing the basic configuration of the present invention.

The output signal of the fixed frequency oscillator OSCI is passed through a point, for example, to a programmer counter PC with a frequency division ratio of 1/N.
1, the frequency of the output signal is stepped down by 1/N and appears at point f, which is applied to the phase comparator PD1.

The PD1 and the voltage controlled oscillator VC01, for example, have a frequency division ratio of 1/
Since the programmable counter PC2 of M forms a phase-locked loop so-called PLL circuit, the point g
Since the signal appearing at point f has the same frequency as the signal appearing at point f, a signal having a frequency of 1/N÷1/M=M/N of the output signal frequency appearing at point f is obtained at the point.
On the other hand, the output signal of the oscillator OSCI that has passed through the electronic delay frequency conversion circuit FCI via point C is frequency converted and appears at point d, but the signal at the above point and the signal at point d are added to the phase comparator PD2. A detection signal detected from the frequency difference appears at point e and is output to the voltage controlled oscillator VC02.
is input.

The output signal of the modulated wave oscillator LFO controlled by the VC02 frequency modulates the oscillator wave number of the clock pulse oscillator Cl, and the output signal of the oscillator CL is transmitted to the frequency conversion circuit FC.
Frequency conversion is performed by modulating the delay time of I, and each of the above circuit blocks PD2, CO2, LFO
, CL, and FCl form a kind of servo circuit, and the voltage-controlled oscillator VCO2 operates so that the frequencies of the signals appearing at points d and h are the same, so that the signal at point d and the point c
The frequency ratio between the signal at point h and the signal at point k is the same as the frequency ratio between the signal at point h and the signal at point k, in this case M/N. The electronic delay frequency conversion circuit FC2 has the same circuit configuration as the frequency conversion circuit FCl, and is simultaneously modulated by the same clock pulse oscillator CL, so that the frequency conversion ratio is the same as that of the circuit FCl. Input terminal 1N
The output terminal 0U is converted by the ratio of M/N added to 1.
Appears at T2.

The frequency division ratios of the programmable counters PCl and PC2 can be arbitrarily selected, so if the frequency division ratios are set to arbitrary ratios, the output terminal 0UT2 will be mixed with the unmodulated original musical tone signal obtained from the output terminal 0UT1. It is possible to obtain a musical tone signal with a rich ensemble effect. FIG. 2 is a circuit block diagram showing one embodiment of the present invention.

The first electronic delay frequency conversion circuit includes an electronic delay element BBD
3, BBD4, a fixed frequency oscillator 0SC1 driven by a sawtooth wave oscillator 0SC2, 0SC3, a sine wave oscillator 0SC4, which is composed of amplitude modulation circuits MOD3 and MOD4, and controlled by the output of the voltage controlled oscillator VCO2.
The output of passes through point c and electronic delay elements BBD3, BBD4
receives frequency modulation, and amplitude modulation circuits MOD3 and MOD4
The signal appears at point d as a signal whose amplitude has been modulated and whose frequency has been converted.The state of the frequency conversion will be explained using the waveform diagram of FIG.

The output signal (waveform 1) of the fixed frequency oscillator 0SC1 passes through an electronic delay element BBD3 driven by a clock pulse oscillator CLl which is frequency-modulated with a sawtooth wave (waveform 2), and outputs a waveform 3 having a higher frequency than waveform 1. The signal will be as follows.

Similarly, the output signal of the oscillator 0SC1 passing through the electronic delay element BBD4 is frequency-modulated by the clock pulse oscillator CL2 by a sawtooth wave Y (waveform 4) having a phase difference of 90 degrees from the sawtooth wave x. Then, it undergoes frequency modulation and becomes a signal such as waveform 5 having the same frequency and waveform as waveform 3 above. The signals 3 and 5 undergo amplitude modulation in the amplitude modulation circuits MOD3 and MOD4, respectively, and become signals with waveforms 9 and 7.
The modulation sine waves Q and Q of MOD4 have a phase difference of 180O, and the periods T3 and T in which the frequencies of signals 3 and 5 suddenly decrease, and the troughs of the amplitudes of the sine waves Q and Q. Since the phase relationship is set such that they match, the waveform components within the periods T3 and t5 are extremely attenuated, and the signal that appears at point d when signals 7 and 9 are combined is the same as waveform 10. The output signal 1 of the fixed frequency oscillator 0SC1 is frequency-converted at a constant ratio. Also, as in the basic circuit described above, this frequency conversion ratio is determined by the frequency division ratios of the programmable counters PCl and PC2, so the pitch control circuit PIC connected to the pitch control input terminal 1N3 controls the programmable counter PCl , PC2, an arbitrary frequency conversion ratio can be set. For example, if the oscillation frequency of the fixed frequency oscillator 0SC1 is 1 kHz and the division ratios of the programmable counters PCl and PC2 are set to 1/4 and 1/5, the signal at point k is 0 kHz)
is 250Hz at point f, and since the signal at point g is the same 250Hz as point f, the phase-locked loop circuit P
LL operates and at point h there are 250×5(z) or 1250
A signal of z is obtained. That is, the frequency conversion ratio is 1.25, which is the value obtained by dividing the frequency division ratio 1/4 of the programmable counter PC1 by the frequency division ratio 1/5 of the programmable counter PC2. As mentioned above, the first electronic delay frequency conversion circuit frequency converts the output signal 1 of the fixed frequency oscillator 0SC1 at the frequency conversion ratio set by the phase locked loop circuit PLL.
As in the basic circuit described above, a second electronic delay frequency conversion circuit, that is, electronic delay elements BBDl, BBD2, and an amplitude modulation circuit MO
Similarly, the circuit composed of Dl and MOD2 converts the frequency of the musical tone signal at point a, which is applied from the musical tone signal input terminal 1N1, at the conversion ratio set by the phase-locked loop circuit PLL, and converts the frequency at point b. Thus, a musical tone signal whose frequency is converted at the same ratio is obtained. The musical tone signal applied to the input terminal 1N1 may be not only a single tone but also a compound tone. When a chord, for example a CM code, is input and the frequency conversion ratio is set to 5/4, an output musical tone signal of an EM code is obtained. Further, the noise killer circuit G1 is for eliminating unpleasant circuit noise when there is no input musical tone signal, and the gate of this G1 is controlled by the output signal of the detection circuit GD that detects the presence or absence of the input musical tone signal. The frequency-converted musical tone signal is passed through the first electronic delay frequency conversion circuit only when there is an input musical tone signal, and is output from the output terminal 0UT2.

As described above, the output terminal 0UT2 of the ensemble effect circuit according to the present invention provides an output musical tone signal frequency-converted at an arbitrary conversion ratio, so that not only a single note can be converted to an arbitrary pitch, but also a chord-like signal. Complex musical tones can also be converted into arbitrary pitches, and the output musical tone signal and the output signal of the output terminal 0UT1, that is, the original musical tone signal, can be electrically mixed or emitted from a speaker. By emitting the sound in a specific manner, an ensemble effect with a very rich tone can be obtained.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram showing the basic configuration of the present invention, FIG. 2 is a circuit block diagram showing an embodiment of the present invention,
FIG. 3 is a waveform diagram showing the state of frequency conversion in FIG. 2. 0SC1...Fixed frequency oscillator, PCl, PC
2...Programmable counter, PDl, P
D, ... Phase comparator, VCOl, VCO2...
...Voltage controlled oscillator, FCl, FC2...
Electronic delay frequency conversion circuit, LFO...Modulated wave oscillator, CL...Clock pulse oscillator, 1N1
...Input terminal, 0UT1, 0UT2...
・Output terminal, BBDl, BBD2, BBD3, BBD4
...Electronic delay element, MODl, MOD2, MO
D3, MOD4... Amplitude modulation circuit, 0SC2,
0SC3...Sawtooth wave oscillator, 0SC4...
...Sine wave oscillator, X, Y...Sawtooth wave,
Q, Q...Sine wave, T3, t5...
Period, PIC...Pitch control circuit, P
LL...Phase cut trape circuit, G1.
...Noise killer circuit, GD...Detection circuit, CLl, CL2...Clock pulse oscillator, IN3...Pitch control input terminal.

Claims (1)

[Claims] 1 A first electronic delay frequency conversion circuit that receives an output signal of a fixed frequency oscillator as input and converts and outputs the frequency of the input signal; and a second electronic delay frequency converter that receives a musical tone signal as input and converts and outputs the frequency of the input musical tone signal. a clock pulse oscillator that commonly controls each delay time of the conversion circuit and the first and second electronic delay frequency conversion circuits, or a clock pulse oscillator that is set to have a certain relationship between the oscillation frequencies of each of the clock pulse oscillators; A clock pulse oscillator, a modulation signal generation circuit that outputs a modulation signal for frequency modulating the oscillation frequency of the clock pulse oscillator, and inputting the output signal of the fixed frequency oscillator and frequency converting the signal at an arbitrary conversion ratio. and a frequency arbitrary conversion circuit for outputting, the modulation signal generation circuit inputs each output signal of the first electronic delay frequency conversion circuit and the frequency arbitrary conversion circuit, so that each output signal has the same frequency. By configuring the circuit to output a modulation signal with a frequency as a frequency modulation signal of the clock pulse oscillator, and setting the frequency conversion ratio of the frequency arbitrary conversion circuit to a desired ratio, An output musical tone signal in which the frequency of the input musical tone signal is converted at the desired ratio is obtained from the output terminal of the conversion circuit, and the original input musical tone signal that has not undergone the frequency conversion and the output musical tone signal are connected electrically or through a speaker. 1. An ensemble effect circuit characterized in that a variety of timbre effects can be obtained by acoustically mixing multiple tones in a desired pitch relationship.