A Circuit for Eliminating Impact Sound of Power Amplifier

Abstract

The invention discloses a circuit for eliminating the impact sound of a power amplifier. The circuit includes a switching power supply circuit for supplying power to the entire system, a voltage stabilizing circuit for supplying power to a processor, and a circuit for outputting MUTE_IN signals to control the output of the impact sound elimination circuit. The state processor and the impact sound elimination circuit for eliminating the impact sound of the power amplifier, among which, the circuit for eliminating the impact sound of the power amplifier can not only effectively and reliably eliminate the impact sound generated when the audio equipment is switched on and off, playing and mute, but also It can also effectively reduce power consumption and achieve the purpose of energy saving. In addition, the circuit structure for eliminating the impact sound of the power amplifier of the present invention is simple in structure, easy to use, and safe and reliable.

Description

technical field [0001] The invention relates to a circuit for eliminating the impact sound of a power amplifier. Background technique [0002] With the continuous improvement of living standards, audio equipment is increasingly related to people's lives. For most audio equipment, the sound system is to process and amplify the small audio signal transmitted from the signal source through the audio power amplifier first, and then output it to the speaker, and the sound is emitted through the vibration of the speaker. Therefore, the audio power amplifier circuit is very important to the entire audio equipment, and its design often affects the effect of the entire system. When the audio equipment is turned on and off, due to the coupling effect of the internal capacitance and inductance of the audio power amplifier, irregular audio signals are easily output to the speaker, resulting in an impact sound. In order to eliminate the impact sound generated by the audio equipment at ...

AI Technical Summary

Problems solved by technology

In order to eliminate the impact sound generated by the audio equipment at the moment of power-on and power-off, audio equipment generally adopts the method of making the audio power amplifier in the mute state at the moment of power-on and power-off, but the circuits for realizing this method are different at present, and there are complex circuits and high costs. problem, and the audio device cannot guarantee the lowest power consumption when not in use

[0003] For this reason, the utility model patent application with the application number of 201220116857.6 discloses a power-on noise reduction device for a power amplifier. By adding a noise reduction circuit between the processor MCU and the mute input interface of the power amplifier device, the parallel capacitor of the noise reduction circuit is used. Charging, thereby eliminating the POPO sound when the power amplifier is powered on, but it cannot eliminate the POPO sound generated when the power amplifier is powered off, and it cannot control the real-time switching between mute and playback of the audio equipment during normal operation and eliminate the impact sound generated when switching

[0004] In addition, Chinese patent ZL200910110236.X discloses a circuit for eliminating the impact sound of switching on and off. Through the switching voltage generation circuit, the switching voltage signal is output to control the power-on response switching circuit and the power-off response switching circuit, and an effective mute signal MUTE is output, thereby Eliminate the impact sound generated when the audio device is turned on and off. The disadvantage is that it cannot control the real-time switching between mute and playback of the audio device during normal operation, that is, it cannot achieve the effect of reducing power consumption when the power amplifier has no output.

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