Andrew Lindh wrote:
That is the obsolete G.722 It is too old to have patent protection, but too nasty to be interesting. It was part of the original definition of ISDN, and was supposed to be the PSTN's path to an all 7.1kHz bandwidth future. It never happened. The 10MIPs figure is for a DSP chip. It is probably 50-60MIPs on a Pentium (just an educated guess).G.722 (wideband speech coding standard) would be a good step. It's an accepted standard and some phones already support it. It should not be too hard to write a new codec/format module for asterisk. Looks like it only needs about 10MIPS of power to run. I'm sure there is already some reference code out there. I don't know the copyright/patent status of the code of G.722
One of the benefits from this would be to improve communication between people speaking English where English is NOT their first language. It's hard enough to speak someone else's language but when both parties are using non-native speech you need all the help you can get....if you have the bandwidth for 64K....
FYI: G.722 is a 14 bit 16Khz sampled with SB-ADPCM compression down to 64K, 56K, or 48K.
http://www.itu.int/rec/recommendation.asp?type=folders&lang=e&parent=T-REC-G.722
G.722.1 is the current standard, but it is recent and patented (i.e. the patents will not expire any time soon).
Regards, Steve
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