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Thread: best method to add data stream to audio channel
www.piclist.com/techref/io/audio.htm?key=audio
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face BY : Dan Michaels email (remove spam text)



Richard, the first half of your requirement, to inject a
19200 datastream onto a bandlimited 20khz channel and also
"not" hear it does not sound very straightforward. As Bob
indicated, you may be able to get by by extending the
channel BW, and shifting the datastream up above the human
hearing range.

Also, you might do a search on modems and other devices that
combine voice and data onto one channel.

I am not sure, but believe some of these devices use a form
of time-multiplexing where data and voice are alternated in
time over the same bandwidth channel. However, to do this for
your particular requirements, you may have to employ data
compresison techniques with either/both the voice/data.

- danM
=====================



At 11:20 AM 2/6/01 -0500, you wrote:
>Maybe take some kind of modem chip, which will output, typically a 3+KHz
>bandwidth, then frequency shift the resulting signal up to 22-25KHz or so.
>
>Bob Ammerman
>RAm Systems
>(contract development of high performance, high function, low-level
>software)
>
>{Original Message removed}
<1.5.4.16.20010206104751.0c9fc2be@pop.dnvr.uswest.net>

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Subject (change) best method to add data stream to audio channel

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