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Discussion Groups | Speech Coding | Re: Need info about the MELP bitstream format..?
Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)
Need info about the MELP bitstream format..? - Khubaib - Feb 24 15:00:00 2004
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Dear membes I need to know the bitstream format of the MELP's 54 bit frame.?. I know what are the different bits (the number of bits for different parameters) in the bitstream, e.g. this is the 54 bit format Pitch index 7 Jitter flag 1 Bandpass voicing decision 4x1 Gain for second half of frame 5 Gain for first half of frame 3 LSP frequencies (10 line spectrum pairs) 25 Fourier magnitudes (10 harmonies) 8 Sync bit 1 Total 54 What i need to know is, what are the LSB's and what are the MSB's..? e.g. Where is pitch index lies, at the LSB side, or the MSB side..?. Thanx Khubaib |
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Re: Need info about the MELP bitstream format..? - Abhijeet Joshi - Feb 25 5:50:00 2004
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Hi, See the pdf http://65.90.39.159/html/voicecompress.pdf if you havent seen it already. I think the info on page 6 might be of help Regards, Abhijeet Khubaib <> wrote: Dear membes I need to know the bitstream format of the MELP's 54 bit frame.?. I know what are the different bits (the number of bits for different parameters) in the bitstream, e.g. this is the 54 bit format Pitch index 7 Jitter flag 1 Bandpass voicing decision 4x1 Gain for second half of frame 5 Gain for first half of frame 3 LSP frequencies (10 line spectrum pairs) 25 Fourier magnitudes (10 harmonies) 8 Sync bit 1 Total 54 What i need to know is, what are the LSB's and what are the MSB's..? e.g. Where is pitch index lies, at the LSB side, or the MSB side..?. Thanx Khubaib _____________________________________ Yahoo! Groups SponsorADVERTISEMENT Click Here --------------------------------- Yahoo! Groups Links To Yahoo! India Insurance Special: Be informed on the best policies, services, tools and more. |
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Re: Need info about the MELP bitstream format..? - Jeff Brower - Feb 25 16:01:00 2004
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Khubaib- > I need to know the bitstream format of the MELP's 54 bit frame.?. I > know what are the different bits (the number of bits for different > parameters) in the bitstream, e.g. this is the 54 bit format > Pitch index 7 > Jitter flag 1 > Bandpass voicing decision 4x1 > Gain for second half of frame 5 > Gain for first half of frame 3 > LSP frequencies (10 line spectrum pairs) 25 > Fourier magnitudes (10 harmonies) 8 > Sync bit 1 > Total 54 > What i need to know is, what are the LSB's and what are the MSB's..? > e.g. Where is pitch index lies, at the LSB side, or the MSB side..?. The bits u see above are *after* codebook processing -- u have to back up before codebook quantization in the encode side of the algorithm to clearly see output parameters. -Jeff |
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