System for eliminating POP noise produced by shutting down audio system

Abstract

The invention provides a system for eliminating POP noise produced by shutting down audio system, including a power supply module, a physical switch, an enable control bit power supply, an analog-to-digital / digital-to-analog converter, an operational amplification unit, a microcontroller, and a mute unit, wherein the physical switch is respectively connected with the power supply module, the enable control bit power supply and the microcontroller; at the same time, the power supply module, the enable control bit power supply, the analog-to-digital / digital-to-analog converter and the microcontroller are connected in sequence; the operation amplification unit is connected with the analog-to-digital / digital-to-analog converter, and further connected with the mute unit; and the microcontrolleris also connected to the mute unit. The invention uses the microcontroller to detect the state of the switch of the audio power supply module. When the power switch state is off, the microcontrollercontrols the mute unit to be mute, and then turns off the power, thereby solving the hidden danger and harm caused by the POP noise.

Description

technical field [0001] The invention relates to the application field of electronic technology, and more particularly relates to a system for eliminating POP sound generated when an audio system is turned off. Background technique [0002] POP is an onomatopoeic word, which generally refers to the popping sound produced by transient voltage shocks caused by various operations of audio components at the moment of power supply, power failure and stable power supply, and refers to the sound similar to "bang" made by audio equipment. The transient impact that produces POP noise is usually a very narrow sharp pulse. After being expanded by Fourier analysis, its spectral components are very rich, and the energy distribution in the frequency domain is relatively average. In the audio system, the POP sound is mainly generated by the audio processing unit when the power is turned on or off. The impact of POP sound impacts the human ear, affects the comfort of the senses, and even da...

AI Technical Summary

Problems solved by technology

When POP is generated, it is directly output to the power amplifier, resulting in the failure of the mute unit and poor user experience. When the power of the post-stage system is large, it will even cause permanent damage to the system.

If the POP noise is amplified by high-power equipment and released through the speaker, it will have a huge impact on the human eardrum, and may affect hearing in severe cases

The instantaneous voltage of POP noise is usually several times higher than the voltage of the effective signal, and in severe cases, it may break down components and cause permanent failure

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