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8870

  1. M

    Can MT8870 DTMF decoder module handles none audible signals?

    Hi great members, I've a question that never been answered. I'd like to use DTMF decoder with 8870 chip but before I order it globally, I tested normal calls between cellphones and no DTMF detected and after some research I got that mobile network is transmitting DTMF as digital signals...

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