MD_SHAHRUKH
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What does the noise look like? Wideband? Spikes? Is your microphone cable shielded? If so, where is the shield connected?
Wiring matters a lot on this case, are you using a descent cable between RPI and the input of the audio amplifier ? I mean, a ground shielded one ? In addition, did you check the audio out volume level with the command line alsamixer utility to ensure that it is tunned at the maximal possible? Doing this adjust, you somehow reduce the noise/signal ratio.
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