Post by thread:Codec

Coder - decoder. In the old days a codec was a piece of hardware - a chip. A codec is typically an A/D (analogue to digital) converter plus a D/A converter in the same package. But they usually add extra functionality such as implementing a non-linear coding regime (such as A-Law or mu-Law), or other more sophisticated compression techniques. Originally they were for use in the telecommunications industry. For example, the analogue speech on your phone line is converted to/from a 64kbits/second data stream by a codec on the line card in the exchange. All such codecs implement a non-linear coding regime, typically squeezing a 12-bit signal to noise ratio out of an 8-bit-per-sample data format. In more recent years the software codec has appeared. You can best think of these as an "engine" which converts a data stream from one format into another. Typical uses are for decoding video or sound data streams in various formats. Steve Thackery Suffolk, England. Web Site: http://www.btinternet.com/~stevethack/

"Coder/decoder" or "compression/decompression algorithm", in the same spirit as a modem is a "modulator/demodulator". BTW, many tech sites have good glossaries; Cnet's is at http://www.cnet.com/Resources/Info/Glossary/ , CMP's is at http://www.techweb.com/encyclopedia/ . Most of them can answer many questions like this. --Bob On Sun, Aug 29, 1999 at 03:37:23PM +0200, Duilio Foschi wrote: > what does "codec" means ? > > Thank you > > Duilio Foschi -- ============================================================ Bob Drzyzgula It's not a problem spam_OUTbobTakeThisOuTdrzyzgula.org until something bad happens ============================================================

Hi there, in communications, a CODEC is a section which converts analog audio signals from microphone into digital signals for a vocoder. You would fine CODECs in cell-phones which uses the CDMA modulation scheme. It's the interface between the human side (microphone and earpiece) and the CDMA side. Wilson On Sun, 29 Aug 1999, Duilio Foschi wrote: > what does "codec" means ? > > Thank you > > Duilio Foschi >