一种音量调节噗噗噪声的抑制电路

A Click and Pop Suppression Circuit for Volume Adjustment

在音频信号处理电路中,在进行音量调节的时候也会产生音频噗噗噪声,为了抑制这种噪声带来的影响,我们设计了一种抑制这种由音量调节引起的噗噗噪声的电路,它通过将音量调节时产生的突变电压平坦化来抑制这种突变引起的音频噗噗声,提高声音的聆听效果。该电路采用0.5μm CMOS工艺,仿真和测试结果表明使用该抑制电路后,在调节音量的过程中不会有明显的噗噗噪声。

Undesirable audio click and pop may be generated in the audio signal processing circuit when the user adjusting volume. In order to suppress the effects of the noise,a circuit has been designd,which can inhibit the audio click and pop noise caused by voltage hop at volume adjustment. The circuits soften and flatten the mutations of voltage caused by volume adjustment,and curb the click and pop noise caused by this mutation to improve the effect of audio signal for listening. The circuit with the above features is fabricated with 0. 5 μm CMOS process. Simulation and test results indicate that there is no noticeable click and pop in the process of adjusting the volume after using the suppression circuit.