JPH08272365A - Effector device - Google Patents

Abstract

PURPOSE: To provide an effector device in which the monotoness of the output intervals is eliminted and the breaking effect of the inputted sound is further increased. CONSTITUTION: One of the input terminals of a multiplier 3 is supplied with the periodic signals outputted by an oscillator 1. The other input terminal is supplied with audio input signals. Both signals are multiplied and the signals having the sums and the differences of the frequencies of the two input signals are outputted as effector outputs. The frequencies of the sinusoidal signals outputted by the oscillator 1 are controlled by the outputs of an envelope follower 7 or an envelope generator 8 and the intervals of the outputs of the multiplier 3 are varied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an effector device such as a ring modulator which multiplies an input audio signal by a predetermined oscillator output to change the tone color and pitch of the input audio signal.

[0002]

2. Description of the Related Art Most of the effector devices are designed to maintain the pitch and change only the timbre. Among these, the ring modulator occupies a unique position. The ring modulator is an effector device that changes not only the tone color of the input audio signal but also the tone pitch and makes the tone color like a bell. FIG. 5 is a block diagram showing the configuration of a conventional ring modulator. By amplitude-modulating the input audio signal by the multiplier 22 based on the sine wave signal output from the sine wave generator 21, outputs of the sum and difference frequencies of the two input signals are obtained. When the frequency of the sine wave signal is high, the output frequency is far from the input, and the timbre becomes like a bell.

[0003]

However, the above-described conventional effector device has some effect as an effector in that an output that is far from the input audio signal can be obtained, but the input pitch is If the pitch is constant, the output pitch is also constant.
It is undeniable that the pitch becomes monotonous. Therefore, it is not always satisfactory for the user who desires the destruction effect of the input sound.

The present invention has been made in view of the above problems, and an object thereof is to provide an effector device capable of eliminating the monotonicity of the output pitch and further enhancing the effect of destroying the input sound. To do.

[0005]

An effector device according to the present invention comprises a variable frequency oscillator, frequency modulating means for modulating the output frequency of the oscillator, an input audio signal and an output signal of the oscillator. And a multiplier for outputting the multiplication result as an effector output.

[0006]

According to the effector device of the present invention, when the input audio signal and the oscillator output are multiplied by the multiplier, the frequency of the oscillator output is also modulated by the frequency modulating means. The pitch of the effector output signal also changes. For this reason, it is possible to eliminate monotonic pitch of the output sound, and it is possible to further enhance the destruction effect of the input sound.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an effector device according to an embodiment of the present invention.

The oscillator 1 outputs a signal having periodicity, for example, a sine wave signal. This output is supplied to one input terminal of the multiplier 3. The multiplier 3 multiplies the audio input signal input to the other input terminal by the sine wave signal, and outputs a signal having a sum and difference frequencies of the two input signals as an effector output. The frequency of the sine wave signal output from the oscillator 1 is
It is controlled by the outputs of FOs (Low Frequency Oscillators) 5, 6, an envelope follower 7, or an envelope generator 8. Which of these outputs is used for frequency modulation of the sine wave signal can be selected by the switch 2.

The above-described oscillator 1 is a variable frequency type oscillator, and if the signal to be handled is an analog signal, it is a VCO.
(Voltage Controlled Oscillator) is used. When the signal to be handled is a digital signal, the oscillator 1 can use a waveform generator including a waveform memory unit 11 and an address generation unit 12, for example. The sine wave amplitude waveform is stored in the waveform memory unit 11. The address generator 12 generates a read address for reading the amplitude value from the waveform memory 11 at a constant read rate. The smaller the read address interval, the smaller the frequency of the read sine wave, and the larger the read address interval, the larger the frequency of the read sine wave. This increment of address is given from the operator 4, the LFOs 5, 6, the envelope follower 7, or the envelope generator 8 via the switch 2.

2 to 4 are diagrams for explaining the operation of the apparatus. When the switch 2 selects the output of the operator 4, the frequency f designated by the operator 4
The sine wave of _osc is output from the oscillator 1. In this case, as shown in FIG. 2, the multiplier 3 obtains the output of the sum and difference of the frequency f ₀ of the audio input signal and the frequency f _{osc of the} sine wave. When the switch 2 selects the output of the LFO 5, for example, a sine wave is output from the LFO 5, so that the frequency of the output of the oscillator 1 is modulated into a sine wave, for example, as shown in FIG. As a result, the figure (b)
As shown in, the pitch of the output of the multiplier 3 can have periodicity. Further, when the switch 2 selects the output of the LFO 5, a triangular wave is output from the LFO 6, so that the pitch of the output of the multiplier 3 can be changed in a triangular wave shape. In addition to this, a more complicated periodical change can be obtained by forming the LFO waveform into various waveforms using a waveform memory or the like.

When the switch 2 selects the output of the envelope follower 7, the pitch of the output signal changes according to the envelope of the audio input signal. For example,
The envelope follower 7 from the audio input signal is shown in FIG.
Assuming that the input envelope shown in (a) is obtained, the pitch of the output of the multiplier 3 is as shown in (b) of the figure.
It will change according to this input envelope. Therefore, when the input is large, the pitch changes drastically, and when the input is small, the pitch is close to the input sound, so that the output pitch can be changed depending on the strength of the input sound.
Further, if a frequency change opposite to that of the input envelope is generated, a characteristic opposite to the above can be obtained. Further, such an input envelope may be used as a trigger to change the output frequency based on an arbitrary envelope preset in the envelope generator 8.

[0012]

As described above, according to the present invention,
When the input audio signal and the oscillator output are multiplied by the multiplier, the frequency of the oscillator output is also modulated, so the pitch of the output changes accordingly, and the pitch of the output sound becomes monotonous. Can be eliminated, and the effect of destroying the input sound can be further enhanced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an effector device according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the device.

FIG. 3 is a diagram for explaining the operation of the apparatus.

FIG. 4 is a diagram for explaining the operation of the apparatus.

FIG. 5 is a block diagram showing a configuration of a conventional ring modulator.

[Explanation of symbols]

1 ... Oscillator, 2 ... Switch, 3 ... Multiplier, 4 ... Manipulator,
5, 6 ... LFO, 7 ... Envelope follower, 8 ... Envelope generator, 11 ... Address generator, 12 ...
Waveform memory section.

Claims (1)

[Claims] 1. A variable frequency oscillator, frequency modulation means for modulating the output frequency of the oscillator, an input audio signal and an output signal of the oscillator are multiplied, and the multiplication result is output as an effector output. An effector device comprising: a multiplier.