Date: Mon, 09 Jun 1997 11:51:14 -0500 From: Wm Brian McCane <root@bmccane.uit.net> To: multimedia@freebsd.org Subject: Old standards Message-ID: <199706091651.LAA12694@bmccane.uit.net>
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Howdy, I used to work for a company which built equipment for the railroads. We had a box called a Hot Box Detector (HBD) for detecting bad bearings on a train and telling it to stop. Anyway, it used a little dingus which did ADPCM, at 32K samples/second, and `spoke' the alarm to the train over the radio. If anyone knows about ADPCM, it only requires about 4K bytes to do a 32K/second audio stream. I was thinking about putting together a program for audio over the internet using a software version of ADPCM for real-time chatting. An 11K/second stream would need about 1375 bytes per second to tranfer, so it should work on a 14.4 modem with bytes to spare for the TCP/IP overhead, and ADPCM is fairly compressible by modems which might allow even better performance or quality. Anyway, I was curious if this is old hat (Real Audio maybe), or if noone has considered using this 10+ year old technology. brian
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