Pauline Yeo wrote:
> I am looking for information regarding a Audio format - "AU" which was
> introduced by Sun Microsystems. I have fill up to Sun's on line Contact Form
> but still couldn't get to the appropriate contact person to response to my
> queries.
> Am actually looking for licensing information on behalf of my company, we
> have new Internet Radio project where the device supports the AU format. We
> would like to know if AU format is an open source which do not need license
> to be used or there is royalty fees we need to pay in order to use it to our
> product. Hopefully I have found the correct forum to my question.
> --
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This isn't the right place, but I think I can answer your question...
From the audio man page:
Encodings
An encoding parameter specifies the audio data representa-
tion. u-Law encoding corresponds to CCITT G.711, and is the
standard for voice data used by telephone companies in the
United States, Canada, and Japan. A-Law encoding is also
part of CCITT G.711 and is the standard encoding for
telephony elsewhere in the world. A-Law and u-Law audio data
are sampled at a rate of 8000 samples per second with 12-bit
precision, with the data compressed to 8-bit samples. The
resulting audio data quality is equivalent to that of stan-
dard analog telephone service.
There are no license requirements.
Here's some handy documentation on the file format:
http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/AU/AU.html
Sun used 8Khz u-law encoded files in the SparcStation 1 in 1989.
=- Bart
--
Bart Smaalders Solaris Kernel Performance
barts at cyber.eng.sun.com http://blogs.sun.com/barts
