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Playing voice on SIm300 GSM modem using ISD1420 voice recording IC

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jahanzaibtariq

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AOA
I have a question.I m trying to play audio file using sim300.I have interfaced ISD1420 with pic microcontroller.The ic plays and record the voice very good.Even i am able to recive the call and hear the voice,but issue is the voice contains too much noice.I have directly connected the IC output to the mic input of GSM....can any body provide me the circuit to clear the voice quality?
 

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