Noise gate circuit and voice frequency power amplification equipment

Abstract

The invention discloses a noise gate circuit and voice frequency power amplification equipment. The invention relates to the field of a voice frequency circuit, which provides the noise gate circuit. The input end of the noise gate circuit is connected with a voice frequency signal source, and the output end of the noise gate circuit is connected with the control end of a voice frequency power amplification circuit. The noise gate circuit comprises an amplifier, a reference source, a first comparator and a time delay unit, wherein the amplifier is used for amplifying a voice frequency signal output by the voice frequency signal source; the reference source is used for providing a reference signal source; the first comparator is used for comprising the amplitude value of the signal of the amplifier and the signal of the reference source; the time delay unit is used for outputting the signal output by the first comparator after the signal is output, and is also used for controlling the voice frequency power amplification circuit to be silent or cancel silence. The noise gate circuit does not need to extract the peak value of the voice frequency signal source input signal by the voice frequency signal source and has the advantages that the circuit structure is simple, and meanwhile, the amplitude of the input signal of the voice frequency signal source can be detected at a high precision in real time, and therefore, the control precision on the voice frequency power amplification circuit is high.

Description

technical field [0001] The invention relates to the field of audio circuits, in particular to a noise gate circuit and audio amplifier equipment. Background technique [0002] In the audio power amplifier circuit, there will be background noise due to the audio power amplifier circuit itself or other reasons. noise. In order to solve this problem, a noise gate circuit is used to control the audio power amplifier circuit. When the noise gate circuit detects that the input signal of the audio power amplifier circuit is less than the preset value (noise threshold), the audio power amplifier circuit is muted to eliminate the influence of the background noise. ; When it is detected that the input signal is greater than the preset value (noise threshold), cancel the mute of the audio power amplifier circuit, and the audio power amplifier works at this time. [0003] In the prior art, a noise gate circuit based on peak detection technology is provided. The noise gate circuit base...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a noise gate circuit and audio power amplifier equipment, aiming to solve the problems of complex circuit structure and low control precision existing in the noise gate circuit based on peak detection technology in the prior art

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