Thanks Bruce those are good ideas. As a first step I've integrated the denoiser as an options (Tools-Filter) on freedv-dev if anyone would like to try it.
When I play mmt1.raw through it in a loop it gets rid of the noise but I can here some reverb. This might be because of the 3 second loop of the same file, not sure. All the other pre-processor options (AGC, derverb, AGC) are off. Is it possible for anyone out there to build a Win32 version pls? I think Richard is on vacation. Thanks, David On Sat, 2014-06-21 at 20:58 -0700, Bruce Perens wrote: > It's an improvement. On actual stations rather than this sample, > perhaps speex_preprocess_estimate_update() could be called when the > squelch is not open, so that its estimation is up to date when > transmit begins. I can hear the denoiser cutting in after about half a > second in the sample you sent. > > Can we use the voice activity detector as a VOX? > > You might also try the dereverb on some samples, it's easy to get a > wall bounce in a home station. > > Thanks > > Bruce > > On 06/21/2014 08:38 PM, David Rowe wrote: > > > Hi, > > > > I've coded up a small test program to test the Speex noise suppressor on > > (acoustically) noisy input speech. > > > > Here is a sample of the 1300 bit/s coded speech quality with/without the > > the noise suppressor applied to the input speech before encoding. > > > > The samples were produced with command line magic like: > > > > ./unittest/speexnoisesup ../raw/mmt1.raw - | ./src/c2enc 1300 - - > > | ./src/c2dec 1300 - - | play -t raw -r 8000 -s -2 - > > > > Cheers, > > > > David > > > > > > > > ------------------------------------------------------------------------------ > > HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions > > Find What Matters Most in Your Big Data with HPCC Systems > > Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. > > Leverages Graph Analysis for Fast Processing & Easy Data Exploration > > http://p.sf.net/sfu/hpccsystems > > > > > > _______________________________________________ > > Freetel-codec2 mailing list > > Freetel-codec2@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > ------------------------------------------------------------------------------ > HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions > Find What Matters Most in Your Big Data with HPCC Systems > Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. > Leverages Graph Analysis for Fast Processing & Easy Data Exploration > http://p.sf.net/sfu/hpccsystems > _______________________________________________ Freetel-codec2 mailing list > Freetel-codec2@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ------------------------------------------------------------------------------ HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions Find What Matters Most in Your Big Data with HPCC Systems Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. Leverages Graph Analysis for Fast Processing & Easy Data Exploration http://p.sf.net/sfu/hpccsystems _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
