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Peculiar Ground Problem

Discussion in 'Electronic Design' started by avbhki, Jul 31, 2007.

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  1. avbhki

    avbhki Guest


    I have a DSP Board which does some audio post synthesis interfaced
    though I2S (input and output). When I use pass-through or bypass, I
    can head the audio at the output stage. When I remove bypass and
    pass it though synthesis stage, I can see audio signals on the output
    (after processing) but I am unable to hear audio. I can hear the
    audio when I provide a kind of antenna/ground through body on some
    places on board (Supply, GND, connectors, etc). Since DSP board has
    only digital gnd, I am connected to the power supply and ground of
    output stage only.

  2. What frequency is it sampled at? Is there a low pass filter on the
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