JPS5913676Y2 - vocoder - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vocoder that improves the clarity of consonants.

The circuit block diagram of FIG. 1 shows an example of a so-called vocoder, which is a device for controlling musical sound signals other than human voices to resemble human pronunciation.

In FIG. 1, an audio signal from a sound source G is divided into a plurality of narrow frequency bands by a second band-pass filter group F2, and is used as an audio input signal to a voltage-controlled amplifier group A2.

A voice signal is inputted from input terminal 1 via amplifier A1, divided into voice signals for each narrow frequency band by first bandpass filter group F1, and divided into voice signals for each narrow frequency band by amplitude value detection circuit group C. The amplitude value of the voice signal component is detected, and the detected signal voltage is used as the control voltage of the voltage control amplifier group A2.

Each of the narrow band pass filters F constituting the first band pass filter group F1, 1. Fl.

,...Fl. are the narrow band pass filters F2□, F2□, . . . that constitute the second band pass filter group F2.
...Has an occupied frequency band corresponding to F2o.

The output signals of the voltage controlled amplifier group A2 are added together by the amplifier A3 and sent out from the output terminal O.

In this way, the volume of the audio signal of the sound source G is controlled by the voice signal for each frequency band, and a human vocal sound imitation signal similar to the pronunciation of the voice signal is obtained.

By the way, voiceless fricatives f, S, f and voiced fricatives V, which play a major role in consonant intelligibility in human pronunciation,
Z, Rona is characterized by having an irregular frequency spectrum called fill, that is, having no harmonic relationship, and contains a large amount of high-frequency components.

Therefore, when a musical tone signal from an electronic organ or the like is used as the sound source G of the vocoder, if the musical tone signal does not contain sufficient high-frequency components including fricative frequency components, the output musical tone signal of the vocoder becomes clear. The degree falls.

Therefore, the present invention has been made for the purpose of providing a vocoder which can sufficiently generate the above-mentioned fricatives and improve the clarity of consonants.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a circuit block diagram of a vocoder according to an embodiment of the present invention.
A high-pass circuit X is provided in parallel to the basic circuit of a conventional vocoder as shown in FIG.
is a high-pass filter Fh that passes high-frequency components in the input voice signal, especially high-frequency components above a level where no sense of pitch can be felt, and the gate circuit S that is activated by key operation on a keyboard device.
It consists of a gate circuit S0 that turns ON and OFF at the same time as 2.

The gate circuit S1 is provided so as not to pass the high-frequency component of the voice signal when the keyboard device K is not pressed, and inputs the combined signal of the sound source G without going through the keyboard device. In this case, a musical tone signal input detector may be provided and the gate circuit S1 may be operated by a musical tone signal input detection signal obtained by the detector.

Note that in order to cut off the high-frequency components, it is sufficient to cut off the input musical tone signal, that is, to prevent the sound from being generated when there is no musical tone signal input, so the gate circuit S1 is not necessarily required.

Therefore, when a raw signal is input to input terminal 1, amplifier A1
The raw signal passed through is input to the first bandpass filter group F1 and the high-pass circuit X of the conventional vocoder.

In the high-pass circuit The signal is output from the output terminal O via the signal line.

With the vocoder configured as described above, the output signal sent out from the output terminal O in response to the raw signal input from the input terminal I is processed through the high-pass circuit Since the consonants are reproduced and mixed from among the voice signals, highly intelligible consonants can be generated.

As described above, the present invention provides a vocoder which has an extremely simple circuit configuration, is low in cost, generates highly intelligible consonants, and has high practical value and high productivity.

(References) hearing and speech Editor/Author: Institute of Electronics and Communication Engineers Publisher: Institute of Electronics and Communication Engineers First edition published September 10, 1966 August 15, 1976 10th edition published

[Brief explanation of drawings]

Figure 1 is a circuit block diagram showing an example of a vocoder, Figure 2 is a circuit block diagram showing an example of a vocoder.
The figure is a circuit block diagram of a vocoder showing an embodiment of the present invention. ■・・・Input terminal, O・・・Output terminal, A
1. A3...Amplifier, F□...First bandpass filter group, F2...Second bandpass filter group, F1□ to F1o, F2 , ~F2. . ... Narrow band pass filter, C ... Amplitude value detection circuit group, C1 to Cn ... Amplitude value detection circuit,
A2...Voltage control amplifier group, A2, ~A2o・
... Voltage control amplifier, G ... Sound source, K.
...Keyboard device, X...High-pass circuit, F
h...High-pass filter, Sl, S2...
・Gate circuit.

Claims (1)

[Scope of utility model registration request] means for frequency spectrum analysis of an input voice signal; means for performing the same analysis on voice signals from other sound sources; In a vocoder, the vocoder is equipped with a means for controlling and transmitting each spectrum component of a voice signal, and a high-pass circuit that passes a high frequency component of the input voice signal component that is so high that the pitch is not perceived, is connected to the voice signal. A vocoder characterized in that it is provided in parallel with the input/output path of the