Right. We did the "standard squelch" where we compare a "pitch
frequency" bandpass filter's output to a high frequency band pass
filter's output (same Q), and then compare the differences in the mean
square output. If the power levels are nearly the same, it is
squelched. If the low freq filter exceeds the high frequency filter
output sufficiently and for a stable time, we drop squelch. There is a
dead band region done by counting times above and times below and in the
end, it worked immediately after a couple of bug fixes. It isn't
exactly hidden markov modeling of the state of the sound track but it
has the advantage that it is immediate, cheap, and it works for voice
communications.
Bob
Matt Ettus wrote:
Robert McGwier wrote:
What else did we forget?
We did a proper squelch on the nbfm demod.
Matt
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