Audio amplitude limiting circuit

Abstract

The invention discloses an audio amplitude limiting circuit. The audio amplitude limiting circuit comprises a sampling circuit, an amplification circuit, a rectification circuit, a delayed adjustment circuit, an impedance matching circuit, and a light sensitive resistor, wherein the sampling circuit is used for sampling an input audio signal and outputting the sampled audio signal to the amplification circuit; the sampled audio signal is amplified through the amplification circuit, and the amplified audio signal is output to the rectification circuit; the amplified audio signal is rectified through the rectification circuit, and the rectified audio signal is output to the delayed adjustment circuit; an amplification limiting control starting time and an amplification limiting release time for the audio signal are adjusted through the delayed adjustment circuit; and the audio signal subjected to the amplitude limiting adjustments is output to the light sensitive resistor for splitting. The audio amplitude limiting circuit adopting the technical scheme has the advantage that the problems of a limited amplification limiting amplitude and existence of various distortions in the traditional amplification limiting circuit are solved through driving on the light sensitive resistor.

Description

technical field

[0001] The invention relates to the field of electronic technology, in particular to an audio frequency limiting circuit. Background technique

[0002] With the development of society, people have higher and higher requirements for sound quality, not only require a large dynamic range, but also lower and lower tolerance thresholds for sound distortion. Because audio is a continuously changing signal, and the amplitude of the input signal is also constantly changing, but for the power amplifier or speaker, its own amplification power and the power it can withstand are limited. Due to the complexity of the audio signal, It is difficult to ensure that the voltage or current will not exceed the maximum value. For large dynamic signals with limited power, various clipping and overload distortion will inevitably occur in the actual application process, resulting in waveform distortion and sharply reducing the sound quality. Severe cases may directly damage the pow...

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