An audio signal automatic clipping device with adjustable threshold

Abstract

The invention relates to an automatic audio signal amplitude limiting device with an adjustable threshold value. The automatic audio signal amplitude limiting device comprises an amplitude attenuation circuit, an absolute value circuit and a threshold value adjusting circuit, wherein the amplitude attenuation circuit is used for receiving a feedback signal from the threshold value adjusting circuit to allow the amplitude, which exceeds a preset threshold value, of an audio input signal to attenuate to be lower than the preset threshold value; the absolute value circuit is used for obtaining an audio output signal of the amplitude attenuation circuit to get an audio signal with positive amplitude, and transmitting the audio signal with positive amplitude to the threshold value adjusting circuit; and the threshold value adjusting circuit is used for outputting a feedback signal to the amplitude attenuation circuit when judging that the amplitude of the audio signal with positive amplitude exceeds the preset threshold value. According to the automatic audio signal amplitude limiting device with the adjustable threshold value, damage to audio amplifying equipment or various signal distortion phenomena caused by the audio signals with large amplitudes can be avoided.

Description

technical field [0001] The invention relates to the field of electronic equipment, in particular to an audio signal automatic limiter with adjustable threshold. Background technique [0002] After entering the 21st century, various portable electronic devices have become an important development trend of electronic devices, including mobile phones as communication tools, portable notebook computers, and even MP3 players as entertainment devices. These portable electronic devices all have one thing in common, that is, they all have audio output, that is, each electronic device needs to have an audio amplifier. High-efficiency audio amplifiers are needed not only in portable equipment, but also in high-power electronic equipment. With the improvement of people's living conditions, high-fidelity audio equipment and more high-end home theaters have gradually begun to rise. In these devices, tens of watts or even hundreds of watts of audio power are often required. At this tim...

AI Technical Summary

Problems solved by technology

[0003] However, in the application of audio amplifiers, some special conditions such as non-standard input signals are usually encountered. When the amplitude of the audio input signal is much greater than the rated input voltage, the output power of the audio amplifier will exceed the set maximum Output power, which will not only cause damage to the audio amplifier, but also may cause various signal distortions, which may cause irreversible failures to other devices connected to the audio amplifier

[0004] At present, although some people have proposed some methods to solve related problems, such as adding an automatic volume control circuit at the input end of the audio amplifier, and automatically adjusting the gain with the input audio amplitude, the automatic volume control circuit is relatively complicated, the cost is high, and the response speed is relatively high. slower

Images