search for: speex_denoise

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() have to be doing some kind of profiling. I've looked at a few offline denoise()...

...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 will try out your suggestions just to further confirm my conjecture. When I am done, I have to take the foil out, though. This...

...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() have to be doing some kind of > profiling. > > I've look...

...ever, 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() and outputs both sample sets. The noise is still there, with level fluctuating with gain level, unless "All mute" is chosen. In the case when NO microphone is plugged in, speex_denoise() smoothes the signal and produces smoother (and even amplifies the signal) speech like signals....

> 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() and outputs both sample > sets. > The noise is still there, with level fluctuating with gain level, > unless > "All mute" is chosen. > In the case when NO microphone is plugged in, speex_denoise() smoothes > the signal and produces smoother (and even amplifies the...

...#39;t pay for a foil per licensed customer. So I still have to make our denoising work in this field scenario. -----Original Message----- From: John Haugeland [mailto:JohnH@senscom.com] Sent: Thursday, September 18, 2003 10:43 AM To: 'speex-dev@xiph.org' Subject: RE: [speex-dev] speex_denoise on non-microphone noise (static ?) Take what I say with a grain of salt: I'm an amateur and haven't actually touched Speex in any way, yet. I'm just sort of passing on personal belief from personal experience. Also, check and make sure that the microphone line is insulated. Th...

Hi, I'm not sure how speex_denoise() works, but my solution to this problem is fairly straightforward and works well in practice (in a simple VoIP program.) Note that I am also an amateur and am making up some terminology here... but I've tested my approach on several noisy environments with low-quality mics and it does wor...

...o 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-speech sections are also marked as speech. The root was finally traced down to microphone static noise. Then I pulled the micro...

Hi, There seems to be some confusion as to how speex_denoise (now called speex_preprocess) works. Unlike what some here assume, the noise estimation is not done offline or while prompting the user. The system automatically adapts the noise estimate when it detects that the user is not talking. This also means that it is able to adapt to changing noise enviro...