Hello all, This is slightly off-topic, but should be of interest to some people on this list. I just released version 0.3.2 of the CELT ultra low-delay audio codec (http://www.celt-codec.org/). CELT is designed to encode high quality speech and music with less than 10 ms delay and at rates starting from around 32 kbit/s. This version is "special" in that it is the basis for some listening tests I conducted for an IEEE paper. The results of these tests are included in the comparison page: http://www.celt-codec.org/comparison/ along with some audio samples at http://www.celt-codec.org/samples/tasl/ Cheers, Jean-Marc
Hi Jean Marc, I was very impressed by the comparative results. Could you give a bit more information about what really are 7kHz and 3.5kHz in the 48kHz table? I am looking forward that this will bring a bigger separation between the basic tools and speex in a sense that the basic tools could be used with more than one codec. I even understand that there is interest in the tools alone (Echo supression, ressampler, Jitter buffer, VAD,...) Alain Jean-Marc Valin escreveu:> Hello all, > > This is slightly off-topic, but should be of interest to some people on > this list. I just released version 0.3.2 of the CELT ultra low-delay > audio codec (http://www.celt-codec.org/). CELT is designed to encode > high quality speech and music with less than 10 ms delay and at rates > starting from around 32 kbit/s. > > This version is "special" in that it is the basis for some listening > tests I conducted for an IEEE paper. The results of these tests are > included in the comparison page: http://www.celt-codec.org/comparison/ > along with some audio samples at http://www.celt-codec.org/samples/tasl/ > > Cheers, > > Jean-Marc
Hi Jean Marc, We'll try it out asap- Right now we are using Siren14 at 16khz and 32khz, which I see as the main alternative in that range- so it will be interesting to see how this compares! Tom Jean-Marc Valin wrote:> Hello all, > > This is slightly off-topic, but should be of interest to some people on > this list. I just released version 0.3.2 of the CELT ultra low-delay > audio codec (http://www.celt-codec.org/). CELT is designed to encode > high quality speech and music with less than 10 ms delay and at rates > starting from around 32 kbit/s. > > This version is "special" in that it is the basis for some listening > tests I conducted for an IEEE paper. The results of these tests are > included in the comparison page: http://www.celt-codec.org/comparison/ > along with some audio samples at http://www.celt-codec.org/samples/tasl/ > > Cheers, > > Jean-Marc > _______________________________________________ > Speex-dev mailing list > Speex-dev at xiph.org > http://lists.xiph.org/mailman/listinfo/speex-dev > >
Alain M. a ?crit :> I was very impressed by the comparative results. Could you give a bit > more information about what really are 7kHz and 3.5kHz in the 48kHz table?They're anchors. The 3.5 kHz anchor is a low-pass filter with a cutoff of 3.5 kHz. So it's effectively equivalent to the best quality you can have with a narrowband (8kHz sampling rate) signal. Similarly, the 7 kHz anchor is the best quality you can do with a wideband signal (16 kHz sampling rate).> I am looking forward that this will bring a bigger separation between > the basic tools and speex in a sense that the basic tools could be used > with more than one codec. I even understand that there is interest in > the tools alone (Echo supression, ressampler, Jitter buffer, VAD,...)Well, since 1.2beta3, the "tools" are already in their own library, libspeexdsp. Cheers, Jean-Marc> Alain > > Jean-Marc Valin escreveu: >> Hello all, >> >> This is slightly off-topic, but should be of interest to some people on >> this list. I just released version 0.3.2 of the CELT ultra low-delay >> audio codec (http://www.celt-codec.org/). CELT is designed to encode >> high quality speech and music with less than 10 ms delay and at rates >> starting from around 32 kbit/s. >> >> This version is "special" in that it is the basis for some listening >> tests I conducted for an IEEE paper. The results of these tests are >> included in the comparison page: http://www.celt-codec.org/comparison/ >> along with some audio samples at http://www.celt-codec.org/samples/tasl/ >> >> Cheers, >> >> Jean-Marc > _______________________________________________ > Speex-dev mailing list > Speex-dev at xiph.org > http://lists.xiph.org/mailman/listinfo/speex-dev > >