Monty Andro <monty@blackhole.lerc.nasa.gov> (04/11/91)
Ideally I need voice codec hardware that can compress/decompress voice down to selectable rates of 9600,4800 and 2400 bits/sec. This can be implemented in integrated circuits, circuit boards, or a single unit (a single commercial unit would be best). Does anybody know if such a unit or combination of boards and/or chips exist? Are there units that can come close to my requirement? Maybe one unit can't do all three desired rates, but there may be three single units for each rate. If such a single unit or multiple units exist, can they support OPX (Off Premise Exchange) and SLT (Single Line Telephone) type interfaces? (I'm assuming OPX and SLT are valid interfaces.) Any information that can help me identify integrated circuits or actual commercially available hardware (now or in the near future) will be greatly appreciated. Thanks in advance. Monty
macy@usenet.ins.cwru.edu> (04/15/91)
In article <telecom11.283.8@eecs.nwu.edu> is written: > Ideally I need voice codec hardware that can compress/decompress voice > down to selectable rates of 9600,4800 and 2400 bits/sec. There are several companies now doing this. I have worked with Micom (800-MICOM-US) and Republic Telecom equipment. Timeplex, Stratacom and others do this now as well. Recently a couple of companies have advertised in _Data Communications_ and _Network World_ small, modem sized stand alone units. The names escape me at the moment... > If such a single unit or multiple units exist, can they support OPX > (Off Premise Exchange) and SLT (Single Line Telephone) type interfaces? > (I'm assuming OPX and SLT are valid interfaces.) Most any type of line, with the proper signalling modules, can be supported. Most of those units accomodate either in-band or out of band (part of data stream) signalling. > Any information that can help me identify integrated circuits or > actual commercially available hardware (now or in the near future) > will be greatly appreciated. Sorry, I only work with assembled units, so I can give no codec info. You can give be a call at my office (216) 778-6233 (Cleveland) to discuss this ... or use macy@ncoast.org Macy M. Hallock, Jr. macy@fmsystm.UUCP macy@NCoast.ORG uunet!aablue!fmsystm!macy