I designed a little 8-input SPDIF audio input selector, using Sharp optical
parts and a 74HC151 mux (and an RS-422 line driver/receiver for the pair of
coax connectors). I use a PIC to drive the 3-bit select lines.

Sometimes when switching, there is a loud crack or pop (the SPDIF decoder is
a Sony TA-E9000ES A/V Control Preamp).

Is there some way to avoid this when switching that does NOT involve
actually parsing the SPDIF data and switching on a data packet boundary?

If I must parse the actual data, I suppose I can replace the '151 with a
small PIC. Does anyone have any input as the the capabilities of the PIC in
this application? Any gotchas I might consider?

P.S.-- what's the best way to characterize a message like this, both EE and
PIC related?

TIA,

--
Rick

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