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Transcoder between G.729 & AMR & G.723.1

Started by gray_1024 March 28, 2003
I'm now doing a transcoder between G.729 & G.723.1.

Considering the conversion of pitch delay, since G.723.1 encodes
speech with 30ms frames, while G.729 with 20ms frames, how can i do?

I attempt to convert the pitch delay using linear interpolation, but
the performace is not good enough. Throgh transcoding the test speech
quality deteriorate. And I also don't want to decode the speech
signal and then do the pitch estimation, considering about the
comlexity and time comsume.

Thanks. Hoping for any suggestion.