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Voice interfaceing of a GSM Module and a Bluetooth module

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urslen

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Hi,

I have a GSM module ( Multitech Systems ) and a Bluetooth module ( APM ). The modules, as Individual system, functions perfectly. But when I interface the audio link of the GSM module with that of Bluetooth module, the system does not function well. I have the full design details of blue tooth module, but I dont have any documents for GSM module.

I understand that the impedance mismatch between the audio link of both the modules creats the problem. The audio link ( Mic and Speaker ) of both modules are differintial in nature.

Please suggest me a solution.
 

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