Path: utzoo!dciem!nrcaer!scs!cognos!crcmar!barry
From: barry@crcmar.uucp (Barry Mclarnon)
Newsgroups: sci.electronics
Subject: Re: CODEC - How to get one?
Message-ID: <945@crcmar.uucp>
Date: 17 Oct 88 14:21:07 GMT
Article-I.D.: crcmar.945
References: <375@limbic.UUCP>
Organization: CRC, Ottawa CANADA
Lines: 34

From article <375@limbic.UUCP>, by gil@limbic.UUCP (Gil Kloepfer Jr.):
> Recently, I have been playing around with sound digitization, and was able
> to get a peek at a commerical unit.  It had a chip in it that was referred
> to as a CODEC.  This appears to be a A/D & D/A converter with an audio
> compression that they refer to as mu and A law.
> 
> Can anyone provide input on what the mu and A law compression schemes are,
> and (especially) how I would go about getting a CODEC chip (prices, locations,
> etc).  Would a company like Motorola, AT&T, or TI provide evaluation kits
> with these chips?
> 
I'm not sure about evaluation kits, but you probably won't need one once you
get the applications info on the chips.  The best source for this is the data
books from the various manufacturers.  They can usually be had for free if you
contact the nearest sales office or distributor and ask nicely.  Here are
several to look for, so you should be able to hit on at least one of them:

Motorola: Telecommunications Device Data

National Semiconductor: Telecommunications Databook

Intel: Telecommunication Products Handbook

Hitachi: CODEC/Filter Combo LSI Data Book

TI: Telecommunications Circuits Data Book

Good luck!


-- 
Barry McLarnon    Communications Research Center   Ottawa, ON   Canada
UUCP: uunet!ai.toronto.edu!utgpu!bnr-vpa!bnr-rsc!crcmar!barry
Compu$erve: 71470,3651     Packet radio:  VE3JF @ VE3JF