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weird noise from STA321MP output

Question asked by Phan.Le_Son on Jan 7, 2016
Latest reply on Jan 12, 2016 by Phan.Le_Son

I am using STA321MP to record the audio signal, I have observed the noise from its output signal when there is no speech. The period is ~20ms. Do you have any idea where it is from?noise_sta321mp.PNG