Yes that is correct.. you say 8000 but its really 16000 anyone that says 16000 is doing it wrong.
/b On May 28, 2008, at 1:01 PM, Alfred E. Heggestad wrote: > Brian West wrote: >> What else is great is his phone does G722 wideband. w00t! > > btw, what kind of G.722 wideband codec do you support? > > I see that you are using G.722 implementation from the "voipcodecs" > library, and that you are using different samplerates, one signalled > in SDP (8000 Hz) and 16000Hz as the actual DSP samplerate. Is this > correct? > > From RFC 3551: > > 4.5.2 G722 > > G722 is specified in ITU-T Recommendation G.722, "7 kHz audio-coding > within 64 kbit/s". The G.722 encoder produces a stream of octets, > each of which SHALL be octet-aligned in an RTP packet. The first > bit > transmitted in the G.722 octet, which is the most significant bit of > the higher sub-band sample, SHALL correspond to the most significant > bit of the octet in the RTP packet. > > Even though the actual sampling rate for G.722 audio is 16,000 Hz, > the RTP clock rate for the G722 payload format is 8,000 Hz because > that value was erroneously assigned in RFC 1890 and must remain > unchanged for backward compatibility. The octet rate or sample-pair > rate is 8,000 Hz. > > > ... > > are you planning to add G.722.1 support at some point? I guess there > are no free implementations of this codec, yet.. > > > Thanx > > > /alfred Brian West sip:[EMAIL PROTECTED] _______________________________________________ Freeswitch-users mailing list [email protected] http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
