Voice switched speakerphone IC and CODEC problem

Discussion in 'General Electronics Chat' started by eepty, Mar 20, 2013.

  1. eepty

    Thread Starter New Member

    Sep 11, 2012
    I want to make a VoIP speakerphone but now I found echo problem (sound from speaker loop back to the microphone). I use a normal audio codec so it does not have echo cancellation feature. So now I want to find an IC which I can add in the analog path (e.g between the microphone/speaker and CODEC) to solve the problem. I found some IC called Voice Switched Speakerphone IC which is designed for normal telephone. Basically it change the full-duplex conversation to half-duples.

    I want to ask if I can connect the transmit in/out pin of this kind of IC to the microphone/speaker pin of the CODEC? (in the other words, I want to feed the signal out from the voice switched IC to the CODEC).

    One of these IC : http://www.freescale.com/files/timing_interconnect_access/doc/data_sheet/MC33219A.pdf