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1999\08\29@093844 by Duilio Foschi

what does "codec" means ?

Thank you

Duilio Foschi

1999\08\29@102525 by Steve Thackery

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:

1999\08\29@103404 by Bob Drzyzgula

"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 ,
CMP's is at .
Most of them can answer many questions like this.


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                until something bad happens

1999\08\30@080119 by Wilson Tam

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.


On Sun, 29 Aug 1999, Duilio Foschi wrote:

> what does "codec" means ?
> Thank you
> Duilio Foschi

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