On Tue, 30 Dec 2003 11:49:39 +0800, "Richard Hosking"
wrote:

If necessary,
some of the work could be done in hardware - eg I could limit and square up
the audio waveform and present it the processor as digital level
transitions, so AGC would not be an issue.
Any ideas?

Thanks in advance

Richard

Would also be interested, but have not experimented in this field
since I used the Apple II computer. Good decoding was a problem, but
also too often simple detectors were described. I did some experiments
with slide-back detector which was originally constructed for two-tone
RTTY (850Hz shift) and as such a good choice for single signal, but I
couldn't see much difference from the ATC network used for RTTY

Also had some good experience with MC1496, S042P similar detectors
instead of using envelope detectors

73
Jan-Martin
LA8AK
http://home.online.no/~la8ak/c11.htm
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