Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!ucbvax!decwrl!labrea!glacier!jbn From: jbn@glacier.STANFORD.EDU (John B. Nagle) Newsgroups: comp.dcom.modems Subject: 9600 baud over high-quality audio channel Keywords: modem Message-ID: <17507@glacier.STANFORD.EDU> Date: 21 Jun 88 03:35:33 GMT Organization: Stanford University Lines: 16 I'd like to transmit 9600 baud, simplex, (one-way) over a good-quality audio channel that can handle at least 10KHz. The transmit end must be small and consume modest power; this is a telemetry application. Telephone oriented modems assume a much narrower audio bandwidth (about 3-4KHz) and thus must use very elaborate techniques to cram 9600 baud into that narrow a bandwidth. I'm looking for something simpler, with about 1 baud/Hz channel utilization. This should be about as complex as a 2400 baud modem, for which there exist single-chip versions such as the Fairchild F2224. But that chip can't be turned up to 9600 baud, as far as I know. Any better ideas? The guys who want to push more bits through VHF FM repeaters might have some ideas on this. John Nagle