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Discussion Groups | Speech Coding | problems with SID bitstream
Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)
problems with SID bitstream - Armen Baloyan - Dec 16 11:42:00 2002
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hi all, i'm implementing VAD/CNG/DTX algorithm and have problems with SID bitstream, in Comfort Noise payload draft-ietf-avt-rtp-cn-05.txt and in ITU-T Recomendationg.729 annex B is said , that noise level should be packed in 5 bits, but in Comfort Noise payload draft-ietf-avt-rtp-cn-05.txt is said that noise level should be packed in 7 bits. I don't know which document should the implementation be based. and one more question - is there differences between SID bitstream using different speech codecs(g.711,g.723,g.726,g.729). Thanks in advance, Armen Baloyan |
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Re: problems with SID bitstream - chetan k - Dec 17 8:29:00 2002
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Hi, As far as I know, the noise level is packed with 5 bits, and also the G.729 with annexe B recomends this which is widely used in tele conferencing. Also there are differences in the implementation of SID between speech codecs. ===== With Rgds Chetan k. |
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