Hi,<br>I have one doubt again, that is Vorbis use DCT/MDCT based algorithm and also use psychoacoustic model so this is lossy codec. And I dont think it ca regenerate a better matching waveform than speex. <br>Then there comes FLAC which is the perfect answer to my question, I suppose. But my concern is this that FLAC use simple prediction algorithm and doesnt use any CELP based algo which could have model the waveform coding by having a large codebook and comparing the residual signal and selecting the codebook index.<br><br>For this, shall I start understanding and modifying FLAC itself in case I need to do something for lossless coding or I can try on Speex and than apply entropy coding. <br>I am getting quite good(comparable) results for audio signal(44.1KHz) if use speex and separate entropy coding.<br><br>Please suggest me clearly as I have very small time left to wrap up my work to submit.<br><br>thanking you,<br>Regards,<br>Devilal<br><br><br><br><b><i>Jean-Marc Valin
<jean-marc.valin@usherbrooke.ca></i></b> wrote:<blockquote class="replbq" style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"> > I was just trying to use speex for sampling frequency >48KHz. In the<br>> original Speex-1.0.5 its restricted only upto 48KHz. I tired to modify<br>> it by changing the boundary conditions( the error conditions, i.e. if<br>> sampling freq >48KHz, it gives error) in /src/speexenc.c and then it<br>> atleast doesnt give the error, there is flow in decoding or encoding(i<br>> think).<br>> I suspect there are other constraints in the encoder and decoder to<br>> modify other than this to make it work properly.<br>> At this point, I am not getting the proper decoded(reconstructed)<br>> bitstream. <br>> Can you please suggest me the places where I should make changes to<br>> incorporate this requirement.<br><br>OK, I'm not sure what exactly you're trying to achieve, but I can't
see<br>any sane reason to use Speex at > 48 kHz sampling. I already think 44.1<br>kHz is a bad idea. If you want high-fidelity, use Vorbis, not Speex. If<br>you want decent quality speech, use Speex at 16 kHz or something like<br>that.<br><br> Jean-Marc<br><br></blockquote><br><p>
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