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hi mani, doing the LPC over two overlapping windows permits to obtain a smooth evolution of the LPC parameters (and therefore enhance the quality) without using a lookahead like it is used in other codecs. This technique has been used in the EFR-GSM nacer --- In , "mani_assudani" <mani_assudani@y...> wrote: > > > Hi friends, > > I have implemented complete AMR-NB Enc-Dec on proprietary DSP chip. > As we know AMR-NB works on 8 rates from 12.2kb/s to 4.75kb/s. > > One thing I'll still not clear is - Why in 12.2kb/s rate LPC analysis > is done twice as compared to other rates where LPC anaylsis is done > only once. What is the overall gain ? > > Regards > Manish |
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Hi friends, I have implemented complete AMR-NB Enc-Dec on proprietary DSP chip. As we know AMR-NB works on 8 rates from 12.2kb/s to 4.75kb/s. One thing I'll still not clear is - Why in 12.2kb/s rate LPC analysis is done twice as compared to other rates where LPC anaylsis is done only once. What is the overall gain ? Regards Manish |