SU1626398A1 - Voice signal generator - Google Patents

Abstract

This invention relates to a voice messaging technique. The goal is to increase the noise immunity of the speech signal with high intelligibility. The device contains a microphone 1 connected in series, a correction amplifier 2, a tone extraction block 3, a threshold block 8, an inverter 10, a second key 5, a second amplifier 6, an adder 7, a low-pass filter 9. The output of the threshold circuit is connected to the first input of the first key 4, the output of which is connected to the second input of the adder 7. The second inputs of the first 4 and second 5 keys are connected to the output of the amplifier 2. The device operates as follows. A speech signal containing voiced (tonal) and deaf (noise) sounds is fed to the input of block 3 of the selection of tonal signals. In case a voiced sound is being made at that moment, threshold unit 8 is triggered, which opens the first key 4, and the tone signal from the output of the amplifier 2 passes through the first key 4 to the adder 7 and further to the low-pass filter 9 and to the output. If there is a deaf sound, there will be no signal at the output of the threshold unit 8, it will be at the output of the inverter 10, which opens the second key 5, through which the noise signal will go to the second amplifier 6, to the adder 7, to the low pass filter 9 and to the output . Since noise sounds are more susceptible to interference than tonal ones, noise signals are amplified compared to tonal sounds to achieve a goal. 1 il. cl

Description

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The invention relates to the technology of voice messaging and can be used in a communication system via a telephone channel with a computer.

The aim of the invention is to improve the noise immunity.

The drawing shows a structural electrical circuit of a device for generating a speech signal.

The device contains microphone 1, amplifier 2 with correction, block 3 for selecting tonal signals, first 4 and second 5 keys, second amplifier 6. adder 7, threshold unit 8, low-pass filter 9, inverter 10.

The device works as follows.

A speech signal containing voiced and deaf sounds generated by microphone 1 passes through amplifier 2 to the input of tonal signal extraction unit 3, where a tone is emitted, and when a tone arrives a threshold unit 8 is triggered, the threshold of which is set to the minimum level of tonal impulses. A pulse from the output of the threshold unit 8 opens the first key 4 and the tone signal passes through it to the adder 7 and then through the filter 9 to the low frequencies to the output. Noise (deaf) sounds do not trigger the threshold unit 8, and therefore a signal appears at the output of the inverter 10, which opens the second key 5.

Thus, keys 4 and 5 work alternately, skipping either tone or noise. The noise pulses are amplified by the second amplifier 6. The resulting tonal and amplified noise sounds are summed in adder 7 and, after the low-frequency suppression of the high-frequency components by the filter, resulting from switching and summing, are output.

Since noise sounds are more susceptible to interference than tonal sounds, they are amplified in a device for generating noise immunity compared to tonal ones.

Claims (1)

Invention Formula A device for generating a speech signal containing a serially connected microphone, an amplifier with correction, a tone extraction unit and a threshold unit, characterized in that, in order to improve noise immunity, a first key is inserted as well as serially connected inverter, second key, second amplifier, adder and a low-pass filter, the input of the inverter is connected to the output of the threshold unit and to the first input of the first key, and the second inputs of the first and second keys are combined and connected to the output of the amplifier with rrektsiey, and the output of the first switch coupled to a second adder input, a threshold input unit connected to the output tone separation unit.