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[liberationtech] Efficient digital one-way communication

Michael Rogers michael at briarproject.org
Mon Mar 4 08:17:23 PST 2013


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On 04/03/13 15:56, Jens Christian Hillerup wrote:
> Nice information, thanks. Would it be wrong to assume larger data 
> rates to be attainable on an FM "link" than over the telephone
> line? For music etc. FM has far superior sound quality in any
> case.

Good point - FM radio stations use 15 kHz of bandwidth for the mono
audio baseband, so I guess you'll have 30 kHz to play with if you
transmit in stereo, versus 3 kHz for a phone line.

> Another thing I didn't tell in my first mail is that I've been
> wanting to design a protocol for metadata, too, since it doesn't
> really make sense to decode and save half files anyway. It would
> also make it possible to send the file names and file sizes
> beforehand so the receiver can know how much of the file s/he has
> already received.

Interesting - I'm working on transport and messaging protocols that
are suitable for use over one-way channels. Ping me off-list if you're
interested in collaborating?

Cheers,
Michael

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