JPS58224Y2 - Tone forming device for electronic musical instruments - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a musical tone forming device for an electronic musical instrument that expresses musical tone modulation effects such as tremolo, vibrato, and chorus.

In order to express modulation effects such as tremolo and chorus in an electronic musical instrument, an amplitude modulation circuit 11 is inserted into the musical tone signal circuit as shown in FIG. Amplitude modulation is added to the signal.

In this case, when adding a tremolo effect, an oscillation signal from the low frequency oscillator 12 of around 10 is added to the amplitude modulation circuit 11 as a modulation signal, and when adding a tremolo effect, an oscillation signal of 2 to 3 Hz is added to the amplitude modulation circuit 11 as a modulation signal. The oscillation signal of the low frequency oscillator 3 is used as a modulation signal, and the selection of tremolo and chorus effects is performed by a selector switch 14.

That is, in the past, the musical tone signal amplitude modulation circuit 1
The type of musical sound effect to be expressed is selected by switching and selecting the frequency of the modulation signal supplied to 1.The effect of the musical sound to be performed is limited to the set type, and the degree of freedom in performance expression is limited. Become something.

This idea further improves the above-mentioned drawbacks,
In particular, the purpose is to provide a musical tone forming device for an electronic musical instrument that can express the modulation effect of musical tones with a sufficient degree of freedom. In addition to supplying
The oscillation frequency of the variable frequency oscillator is variably controlled by an operating device whose resistance value is continuously changed.

An embodiment of this invention will be described below with reference to the drawings.

FIG. 2 shows its configuration. A musical tone signal obtained in response to a key operation, etc. is taken out via an amplitude modulation circuit 11, and the output musical tone signal is output as a performance sound from a speaker by a sounding means (not shown). Becomes pronounced.

The amplitude modulation circuit 11 is supplied with an oscillation signal from a voltage-controlled variable frequency oscillator 16 as a modulation signal via a switch 15 for controlling the effect on and off. In this state, an output signal whose amplitude is modulated by the oscillation frequency signal of the variable frequency oscillator 16 can be obtained.

The variable frequency oscillator 16 is constantly supplied with a constant voltage signal vb via a resistor R1, and is controlled and set to oscillate a low frequency signal corresponding to this voltage signal vb. A voltage signal from the operating device 17 via R2 is also added and supplied.

The operating device 17 includes a resistor Ro to which a constant voltage (■) is applied.
It has a structure in which a conductive material is set opposite to the entire surface, for example through a small gap, and when the surface of the conductive material is pressed with a fingertip, etc., the conductive material at the pressed location will partially become a resistor. Ro is in contact with the resistor R, and a divided voltage signal of the voltage signal (2) corresponding to the contact position is taken out via the conductor, and the voltage signal taken out from the conductor is connected to the resistor R.
It is now supplied to the second circuit.

That is, in the device configured as described above, for example, when only the voltage signal vb is supplied to the variable frequency oscillator 16, the oscillator 16 oscillates two to three signals, and when the switch 15 is turned on, 2 to 3 musical tone signals
The chorus effect is created by modulating the amplitude of the signal.

When the operating device 17 is operated in this state, a voltage signal corresponding to the operating device is supplied together with the voltage signal vb to the variable frequency oscillator 16, and this oscillator 16 is supplied to the operating device 17.
The oscillation frequency is variably controlled arbitrarily and continuously according to the operating state of the oscillation frequency.

In other words, the amplitude modulation period of the musical tone signal can be arbitrarily controlled by the operating device 17, and it is possible to not only express conventional effects such as tremolo and chorus, but also to create similar modulation effects with a large degree of freedom. Become able to express yourself.

Such effects are expressed as new and varied musical sound effects that cannot be obtained at all with electronic musical instruments that express conventional modulation effects. It has a very large effect on

In the above embodiment, the standard modulation signal frequency is a constant voltage vb
The modulation frequency is set variably in accordance with the operating position of the operating device 17.

However, during actual musical performance operations, it may be difficult to accurately identify especially the first operating position of the operating device 17. If the modulation frequency is set according to the amount, it is effective for performance operations.

FIG. 3 shows an embodiment in the above case, in which the stop of the voltage signal from the operating device 17 having the same structure as described above is detected by the differentiating circuit 18, and It is supplied to the gate circuit 19 and the differential amplifier 20 as an addition element.

Then, the one-shot circuit 21 is driven by the differential output from the differentiating circuit 18, the gate of the gate circuit 19 is opened by the one-shot pulse output signal, and the voltage signal taken out via the gate circuit 19 is sent to the hold circuit 22. This hold circuit 22 holds the memory.
The hold voltage signal is supplied to the differential amplifier 20 as a subtraction element.

That is, in this differential amplifier 20, the hold circuit 22
The memory voltage ■0 is compared with the voltage Vp obtained from the operating device 17 at that time, and the difference voltage (Vp - Vo) is extracted as an output signal. It is supplied to the circuit of the resistor R2 of the oscillator 16.

That is, in this device, when there is a first operation in the operation device 17 and the output voltage signal rises, the gate circuit 19 is opened by the output of the one-shot circuit 21 in response to the rise, and the gate circuit 19 is opened at the first operation position. The voltage V corresponding to
o is now held and stored in the hold circuit 22.

In this first operating position, VO=vp, so the output of the differential amplifier 20 is at zero potential.

In this way, if the operating device 17 is continuously operated after the voltage 0 corresponding to the initial operating position is stored, the voltage Vp changes continuously corresponding to the operating position, and the differential amplifier The output voltage signal (Vp-Vo) of 20 changes in proportion to the direction and amount of operation movement.

That is, the modulation frequency of the musical tone is based on the initial operating position of the operating device 17, and is thereafter variably controlled in accordance with the operating direction and amount from that reference position.
The operation control operation of the operating device 17 when playing an electronic musical instrument is greatly simplified, and the control setting of the modulation effect addition state is facilitated.

In the embodiment, the case where the musical tone signal is amplitude modulated has been explained, but if the musical tone signal is configured to perform frequency, angle modulation, etc., it is also possible to perform continuously variable control of the vibrato-like modulation effect. By controlling the frequency characteristics of the base metal color forming filter circuit, it is possible to similarly control the effect of timbre modulation.

As described above, according to this invention, the expression of various modulation effects of musical tones can be controlled freely and continuously, and the control effect for musical tone formation of electronic musical instruments is remarkable. It is highly effective in improving performance expressiveness.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating a conventional musical tone modulation effect control means, FIG. 2 is a diagram showing a modulation effect addition control section of a musical tone forming device according to an embodiment of this invention, and FIG. 3 is a diagram illustrating another example of this invention. It is a figure explaining an example. 11... Amplitude modulation circuit, 16... Variable frequency oscillator, 17... Operating device, 18...
... Differential circuit, 19 ... Gate circuit, 20.
... Differential amplifier, 21 ... One shot circuit, 22 ... Hold circuit.

Claims (1)

[Scope of utility model registration request] A performance operating device that outputs a voltage signal corresponding to the operating position, a detection circuit that detects the rise of the output voltage from this operating device, and a detection signal from the detection circuit that stores the output voltage signal from the performance operating device. A circuit that holds the
an arithmetic circuit that calculates the difference voltage between the voltage signal stored in this circuit and the output voltage signal of the performance operating device; a variable frequency oscillator whose oscillation frequency is variably controlled based on the arithmetic result of this arithmetic circuit; A musical tone forming device for an electronic musical instrument, comprising a musical tone modulation circuit that supplies an oscillation signal of a variable frequency oscillator as a modulation signal.