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This works really well for white noise reduction. However what I've noticed was the amplitudes of normal speech samples also get reduced. Is this something by design, or is there a way to automatically recover the original speech sample volumes ? <p>Thanks. <p>Tongbiao <p>-----Original Message----- From: Jean-Marc Valin [mailto:jean-marc.valin@hermes.usherb.ca] Sent: Tuesday, August 12, 2003 12:44 PM To: speex Cc: Tongbiao Li Subject: Re: [speex-dev] reduction of noise due to high microphone gain Hi, You might want to try the denoiser I've got in CV...

...is being sent out (I have VAD, DTX on)? I could not find an API function for it, so tried frame rate. For nb, it gives 2950-3950 for silence, however it seems to also give low number sometimes even for speech periods. I am wondering if this is a property that can be queried ? Thank you, Tongbiao <p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'speex-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscri...

...m thinking of packing two 20 ms frames of the low band data as input to Wideband mode for encoding. Is this a feasible idea? I actually tried it out. Speech came out at the decoding end, but I could occasionally hear low pitched, high frequency background noise. Thank you, <p>Tongbiao Li <p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'speex-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubs...

...is set to really high, noise samples are taken as speech, as indicated by the non-zero return value from speex_encode() calls. I had VAD turned on. Are there other settings that I need to adjust? If not, could someone recommend a suppression solution in this case ? Thank you, Tongbiao Li <p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'speex-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubs...

...o the frames were encoded OK, and only the way I called on the decoding side had problems. The question is: do I need to let the decoder read in each frame separately and speex_decode() on each? Note, for VBR, I have to transfer frame size for EACH frame, which is not as desirable. Thank you, Tongbiao <p>-----Original Message----- From: Jean-Marc Valin [mailto:jean-marc.valin@hermes.usherb.ca] Sent: Monday, May 12, 2003 11:02 AM To: speex Cc: Tongbiao Li Subject: Re: [speex-dev] auto-detection of frame boundary > Hereÿs the situation: 3 frames are being transferred back to back over...

...and that it's a *guess*. If this fixes or at least betters the situation, you're going to need to find a legit way to insulate these cards, or to switch cards. If it's for customers, I should hope you wouldn't be using enamelled aluminum foil. :D -----Original Message----- From: Tongbiao Li [mailto:tli@viack.com] Sent: Thursday, September 18, 2003 11:20 AM To: speex-dev@xiph.org Subject: RE: [speex-dev] speex_denoise on non-microphone noise (static ?) <p><p>Thanks for the speedy response and detailed, enlightening explanation. Now I understand where the problem is, and...

...han internal/interference noise. And chances are, you have to use some kind of wizard to get the user to set their volume levels correctly and speak properly into (and test) the microphone, so it shouldn't be too much harder on the user to have the profile get built as part of that... Tom Tongbiao Li (tli@viack.com) wrote: > > That's might be speex_denoise() is trying to do already, based on the > fact that if noise is present in speech signal, the former gets > suppressed to a certain extend. Also, I noticed after suppression, the > short, noisy attack - speex_denoise()...

...s only necessary to consider the sequence of bits as output by the Speex encoder, and present the same sequence to the decoder", I kind of got the impression that length-prefix PER FRAME is not necessary, as long as speex_decode() is called 3 times. Is this true ? Thanks all, Tongbiao Li <p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'speex-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubs...

...far > as removing it completely, I think there were a few posts about that a couple > of months ago that suggested some good approaches- of course, the best > way to solve it is to get a good head phone/directional mic setup :) > > Tom > > > > At 10:52 AM 11/26/2003, Tongbiao Li wrote: > >This is only remotely related: just out of curiosity, does > >speex_preprocess work very well for you ? > > > >It only works to certain extend for me, and does not seem to completely > >remove noise from sound card. Even if you unplug the microphone, it &...

...ual, non-adaptive process (for now anyway...) One person I talk to has a monitor which causes annoying noise only when the screen is mostly white. So sometimes I end up asking them to rebuild the profile. Well, I'm not sure if this is helpful or not, but it works for me.. :) Tom <p>Tongbiao Li (tli@viack.com) wrote: > > The problem started with speech detection. Speech sections are detected > well. However, once in a while non-speech sections are also marked as > speech. The root was finally traced down to microphone static noise. > > Then I pulled the micropho...

...l. Really, unless there's a different problem and I'm just yapping into the wind, the best thing to do would be to get a sound card that fits into an AC97 riser, or an insulated sound card, if they exist. Turtle Beach and Roland seem like likely vendors. -----Original Message----- From: Tongbiao Li [mailto:tli@viack.com] Sent: Thursday, September 18, 2003 10:37 AM To: speex-dev@xiph.org Subject: [speex-dev] speex_denoise on non-microphone noise (static ?) <p><p> The problem started with speech detection. Speech sections are detected well. However, once in a while non-spee...

...ess there's a different problem and I'm just yapping into the wind, the best thing to do would be to get a sound card that fits into an AC97 riser, or an insulated sound card, if they exist. Turtle Beach and Roland seem like likely vendors. -----Original Message----- From: Tongbiao Li [mailto:tli@viack.com] Sent: Thursday, September 18, 2003 10:37 AM To: speex-dev@xiph.org Subject: [speex-dev] speex_denoise on non-microphone noise (static ?) The problem started with speech detection. Speech sections are detected well. However, on...

...ual, non-adaptive process (for now anyway...) One person I talk to has a monitor which causes annoying noise only when the screen is mostly white. So sometimes I end up asking them to rebuild the profile. Well, I'm not sure if this is helpful or not, but it works for me.. :) Tom <p>Tongbiao Li (tli@viack.com) wrote: > > The problem started with speech detection. Speech sections are detected > well. However, once in a while non-speech sections are also marked as > speech. The root was finally traced down to microphone static noise. > > Then I pulled the micropho...

This is only remotely related: just out of curiosity, does speex_preprocess work very well for you ? It only works to certain extend for me, and does not seem to completely remove noise from sound card. Even if you unplug the microphone, it still could not get rid of the noise. Any idea how it could be totally eliminated ? <p>Thanks <p><p>-----Original Message----- From: Tom

The problem started with speech detection. Speech sections are detected well. However, once in a while non-speech sections are also marked as speech. The root was finally traced down to microphone static noise. Then I pulled the microphone out. Our system still records noise. To isolate the problem, I wrote a small app just to open the device and record raw samples, calls speex_denoise()

I am trying to follow RTP Payload Format for the Speex Codec, and it looks like I need to pack 01...1 to the end of the frame. Otherwise, the receiving end would not recognize the end of the 3rd (and last frame): speex_bits_remaining() keeps on returning value > 0, and a 4th attempt to decode (non-existant) frame will fail. I do not have the number of frames available, and would rely on the