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From: billy@MIX.COM
Newsgroups: comp.sys.mac.system
Subject: Re: Security Scare ?
Date: Tue, 26 Nov 2013 03:01:59 +0000 (UTC)
Organization: PANIX Public Access Internet and UNIX, NYC
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Alan Browne <alan.browne@freelunchvideotron.ca> writes:

> There's no need for a perfect wave form at the mic, just a long enough 
> sample time (per bit period) to determine the tone f - and with a pretty 
> wide frequency tolerance to boot.

All you need are good zero crossings.  I work with this every day,
in the form of SMPTE time code.  There has been a massive amount of
software written for this.  Out of 80 bits per frame, 16 are used
for a sync word, and the other 64 are data.  At 30 frames/second
(play speed for me), that's 240 bytes/second.  Going much faster
(as in shuttling tape), that's many more bytes/sec.

Billy Y..
-- 
        sub     #'9+1   ,r0             ; convert ascii byte
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	bcc     20$                     ; not a number