Modem tones over television or radio

From: John Foust <>
Date: Thu Dec 10 10:41:50 1998

At 11:11 AM 12/10/98 -0500, wrote:
>And many different
>digital services are encoded in the video blanking interval of
>TV signals - closed captioning, timestamps, and program
>information, among others.

I'm quite familiar with info stuffed in the video blanking
interval and other scanlines (once upon a time in '82 or so,
I interfaced a RSTS dial-up to a LINC/8 so as to make weather
reports available online) but those schemes seem "out of band"
to me - they're not in the audio.

>> Certainly there would be bandwidth and therefore speed
>>limitations, but does the FCC allow this?
>It's a requirement of the new EBS replacement!

Cynical as I am, the fact that the government is allowed to
do something doesn't tell me it's legal for citizens. :-)

I seem to remember something about tone encoding/decoding
being illegal within citizen's band radio, for example.
Received on Thu Dec 10 1998 - 10:41:50 GMT

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