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Discussion Groups | Speech Coding | Why G.723.1 degrades the high frequency components of speech?
Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)
Why G.723.1 degrades the high frequency components of speech? - koro - Aug 12 7:45:00 2004
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Dear all: I found that when a female speech was coded by G.723.1, the speech sounds more "low" (high frequency components degradation). However, this situation is less noticeable in the case of male speakers. In fact, I had tried GSM and G.729 before, and female speakers always get more low quality outputs than male. I am not sure but I think that this "curse" may be caused by the over- simplification of the residual signal (or fixed-codebook in the case of CELP) because residual take care of the more unpreditable part of speech (high frequency components). Am I right or there is another explanation? Thanks in advance! Koro Chen |
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