search for: noise

Hi, I've had a small case with noise suppression and AGC. I have a fairly noisy environment here, and with the default parameters, noise suppression works fairly well while I talk. However, when I shut up, AGC starts slowly increasing the gain until it has amplified whatever noise is left to levels about equal to having no filteri...

Jean-Marc Valin wrote: >> I've had a small case with noise suppression and AGC. I have a fairly >> noisy environment here, and with the default parameters, noise >> suppression works fairly well while I talk. However, when I shut up, AGC >> starts slowly increasing the gain until it has amplified whatever noise >> is left to levels...

Has anyone come across a device that could cancel out the noise from servers, ie. the fan noise? I have a server rack near my office and would like to see if i can decrease the noise level. It would seem to me that the steady drone of the fans could be cancelled out to a large extent.

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...

Hi Jean Thanks for the reply. We expect to use the codec in an environment where we expect very high background noise where high noise suppression will be needed. In a situation like a soccer match. Is there a way of retaining high noise suppression and still getting better audio quality. Your pointers will be of great help. Thanks, Gurinder On 6/4/10, Jean-Marc Valin <jean-marc.valin at usherbrooke.ca> w...

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()...

I am running speex 1.2beta1 on WM2003 using FIXED_POINT option, I got big clicking noise during encoding or decoding randomly, I got more noise if I spoke louder or made the MIC sensitivity higher, for example, when I encode the wav file to spx file, the original saved wav file does not have such noise, the noise is added only after it's converted to spx format. The floating point...

...t; since PC configurations vary so much. Consider an integrated AC97 codec vs. the mic input on an SB Live!/Audigy Live!Drive, or whether or not the input from the CD-ROM audio is muted, or what noisy devices might be situated near the mic. It's nice to be able to get rid of environmental noise too. In my experience this has been much more troublesome than 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...

...eal with two time series (indeed I have no info about time). If I call A=(A1,A2,...) and B=(B1, B2, ...) the 2 variables (two vectors of numbers most of the case, but sometimes they can be categorical variables), I can plot one against the other and I essentially I need to determine whether A=f(B, noise) or B=g(A, noise) where the noise is the effect of other possibly unknown variables, measurement errors etc.... and f and g are two functions. Without the noise, if I want to test if A=f(B) [B causes A], then I need at least to ensure that f(B1)!=f(B2) must imply B1!=B2 (different effects must ha...

Hi, In my dial plan I've configured two trunks to make outbound calls (trunk1 and trunk2) to same service provider but I want when any of my exten starts with _2. should goto trunk2 and there should be some kind of disturbance (like some noise or some background noise) when my calls goes to trunk2 to make the call quality bad. Mainly I want to achieve bad call quality on trunk2 by adding some noise /echo /latency or something. Please guide me. thanks arun -------------- next part -------------- An HTML attachment was scrubbed... URL: h...

Would it help if I scale the input wav data before encoding to spx? One interesting thing is if I encode the same wav file to spx(or decode the same spx file to wav ) on Windows platform, then there is no such big clicking noise, samething is true if I use floating_point speex library to encode/decode on WM2003. Problem happens only on WM2003 using FIXED_POINT library. Thanks Yanxin ----- Original Message ----- From: "Jean-Marc Valin" <jean-marc.valin@usherbrooke.ca> To: <ycui@wmsvision.com> Cc:...

Hi We have static noise problem on our asterisk server. latest stable release. The card is a new TDM04B We have it installed on the following hardware Motherboard Intel SE7520BD2SCSI 2x POWER SUPPLY 730W INTEL I will not mention the other hardware because we have desactivated/changed all the other items The only 2 ite...

On 12/24/2016 1:57 PM, Digimer wrote: > There are rack chassis designed to reduce noise. An example are the APC > NetShelter CS line. > > http://www.apc.com/shop/ca/en/categories/racks-and-accessories/racks-and-enclosures/netshelter-cx/_/N-1ks6cn2 wow, $9100 for the 38U rack. thats pricey... and that's before PDUs, UPS, and all that other important rack mount stuff....

Hi list, I have a client with a strange requirement: putting a noise gate on the Asterisk channel. For those who are not familiar with them, noise gates are used in musical instruments to avoid entering low-level noise into the amp system. What they basically do is, they measure the volume of the channel, and when it's too low they just let the channel close, i....

...;> Linux perf and schedtool. > > > I think this sounds like a very good direction. > > How did you evaluate the improvements exactly? The following run shows e.g > two execution time changes: I sent a screenshot of original results in the previous mail. We used to have lots of noise readings, both from small machine background noise and large noise from the timing tool. Now noise from timing tool is eliminated and only few machine background noise is left. This makes manual investigation possible. > > http://parkas16.inria.fr:8000/db_default/v4/nts/9 > > Are they...

...Obviously, we could plaster the walls with sound absorbing material, but is there anything we can do in software either using any algorithms for our open source-based SIP library or inside Asterisk itself? Related to this, anyone have a good source for good panels? We are using Plantronics noise canceling headsets, which don't really seem to work all that well. Our ancient system handled noise much better, but I suspect that was partly due to the Dialogic ADPCM algorithm used that just reduced the intelligibility of lower volume noises in general. We are using PCMU direct from...

...a A200 card installed in a server with two FXO modules and one FXS module. Analog sets connected to the FXS module have a "squeaky static" -- it's like static mixed with the sound of someone vigorously cleaning a window a few doors down. In other words, it's not a classic static noise, but it is noise, and it's distracting. Remote callers can hear this noise. I have, by turns: - Tested the line with the same analog sets plugged in at the demarcation point. No noise. (None of the SIP devices in this configuration have this noise for outgoing calls, so I'm sure it's...

I am having a problem with and Asterisk installation where two ports connected to a TDM400 card will have a very loud noise when you try to dial. The server has an OpenVox D110P, a TDM04B and a Xorcom Astribank 8 fxs. It is running Zaptel 1.4.11 and Asterisk 1.4.18. The problem always happens with two ports (34 and 35) which are connected to two GSM gateways. They will work fine for a week and then when you try to...

H wrote on 24/12/2016 22:43: > Has anyone come across a device that could cancel out the noise from servers, ie. the fan noise? I have a server rack near my office and would like to see if i can decrease the noise level. It would seem to me that the steady drone of the fans could be cancelled out to a large extent. It's probably too late for you, but the best solution is to buy office-...

Hi all. I bought Digium's dev kit and a used IBM PL300 PC to try it out in. The X100P works fine, but with the TDM400P I get what I can best describe as 'interrupt noise'... noise whenever I type a key on the keyboard, or when something accesses the disk drive, uses cpu, etc. In my other PC it works fine, no noise and sounds great. But I cannot dedicate the other PC to it. Anyone have any ideas? I'd be grateful. So far I've had good success gett...