search for: distortion

Hi everyone, How can I introduce some distortion, echo, chopping sound and all other bad quality things that can happen to a SIP trunk? I have plenty of bandwidth and crisp clear lines so the only thing that I can think of is to limit bandwidth but even that requires quite some scripting work. Is there any easy way to simulate a distorted SIP li...

...s and trunk=no, messages are very clean. Both boxes config'ed as: trunk=yes allow=gsm jitterbuffer=yes Recorded VM messages are very clean. Conclusion: looks like the combination of trunk=yes and jitterbuffer=yes with ilbc is causing the distorted VM messages. Normal answered calls have no distortion. Is this an unacceptable iax config or does this represent a bug? (Problem can be recreated at will and is very consistent.) Rich

Hello, I have been facing an issue that voice is getting distorted sometimes in MOH (MusicOnHold) application. I have checked and confirmed that lame is properly installed, even tried native formats (ulaw, alaw, gsm), but the randomly seen distortion in MOH can't be eliminated. I came to know about requirement of timing device for MOH and MeetMe and a very good illustration by Andrew Kohlsmith on below old post. http://www.mail-archive.com/asterisk at uc.org/msg01449.html I think that today's high speed processors are capable of provid...

Hi, I couldn't find a discussion that specifically addresses this, so here it is. I'm using Speex AEC in my mobile VoIP application to cancel speaker echo. The used version is 1.2rc1 from the website, and I'm compiling with fixed-point. On most occasions, the AEC works very well and cancels most of the echo (combined with the preprocessor). On some devices, where the microphone signal

hi All, Our configuration is, ISDN PRI lines connected to Asterisk Server, SIP users connected to Asterisk We route calls from ISDN PRI to SIP users, We did a CVS upgrade few days ago, now the sip users(CISCO phones) are experiencing, distortion of voice while they are engaged in a call. ie, SIP users can here the call clearly, but the outside caller heres distorted voice. ie, to the caller, call is intermittent. Before the CVS upgrade, the call quality was fine. We did the CVS upgrade cos, earlier version had probs, when restarting PRI c...

...'speexenc' (version 1.0.1), the result is quite acceptable... until I enable VBR. Then it distorts horribly. My understanding of VBR is that it frees the encoder to vary the number of bits emitted to better maintain the quality requested, and so I would have expected, if there were to be distortion, that it would have shown itself with VBR turned off. I thought that VBR turning on VAD might be persuading the encoder to interpret the sound as background noise, but experiments with VAD in CBR mode seem to my ear to add only a very small amount of distortion over non-VAD CBR mode and certainly...

...r certain circumstances, octoBRI (and most likely quadBRI) ISDN cards (Junghanns/CologneChip) severely distort certain ISDN payload. 2.Although these claims relate to the bristuff patch, the problem might not be limited to bristuff and in fact be rather asterisk/zaptel/libpri related. 3.Signal distortion is limited to the use of the CVS version of the Bristuff patch for asterisk (tested on Bristuff-0.2.0-RC8f-CVS/Asterisk-CVS-05.29.05). The Stable versions of the Bristuff patch do not have the problem (tested on Bristuff-0.2.0-RC8f/Asterisk-1.0.7 and Bristuff-0.2.0-RC8n/Asterisk-1.0.9). 4.Sign...

Hi, I'm experiencing a few (but meaningful) cases of audio distortion (or bad quality). I can't say yet how often this happens. Please listen to the following sound file: http://213.96.91.201/temp/distorted_audio_1.wav This was recorded by Asterisk while the local SIP caller was dialing out a SIP trunk (so the problem is on my side, definitely, and it doesn...

Hi Jean-Marc, thanks for the response. First, I will clarify again that floating-point solves this - so isn't that a bug in fixed-point? Also, I understand that algorithmically the AEC won't cancel echo properly on a non-linear signal, but why completely distort the output? If the echo just won't get cancelled it would be acceptable, but in the current state it disables the ability to

...udio ends up playing, but it is very distorted until it switches back to a prerecorded segment. I've uploaded a test of the chain here: https://s3.amazonaws.com/teamalphaservices-test/b1-Live-b2.ogg It plays perfectly in Google chrome, but when attempting to use my own decoder, it has strange distortion when playing the live part. Here's a link to a Github Gist of the decoder I'm using: https://gist.github.com/DrakeWitt/3634299ce4363d26d16c34be229a350f What's the best way to modify my logic to compensate for the odd stream? Thanks! -------------- next part -------------- An HTML att...

...I can listen to the tones being played. On most calls, the tones appear to be detected properly and are muted out of the audio stream (except for a slight click at the beginning of the tone). For problem calls, the tones can be heard in the audio stream as terribly distorted. sometimes the distortion is like the tone being echoed back over itself with some sort of pitch shift, other times the distortion is like the tone is being over-amplified. The unusual thing is that regular audio on these calls is fine. I'm using Asterisk 1.4.18.1, Zaptel 1.4.9.2 built with Oslec SVN running under...

I have searching the forums here on how to get Music On Hold working and I have been able to get * to accept a command for MusicOnHold and for Meetme after loading the ztdummy module. I used the default config for /etc/zaptel.conf since I saw no guidance on this. My problem now is that when I activate MusicOnHold, the sample music file sounds very slow and distorted. My best guess is that it is

https://bugs.freedesktop.org/show_bug.cgi?id=97614 Bug ID: 97614 Summary: occasional screen distortions with nouveau under 4.8.0-rc4+ Product: xorg Version: unspecified Hardware: Other OS: All Status: NEW Severity: normal Priority: medium Component: Driver/nouveau Assignee: nouveau...

...ernel and your nvapeek results clearly suggest you should be affected... Have you enabled compiz (i.e. OpenGL-based 3D acceleration features)? I assume that so far, you haven't (it does not seem to be active in Ubuntu by default), which most likely is the only reason why you are not seeing the distortion issue (so far). See e.g. http://www.howtoforge.com/install-compiz-on-the-unity-desktop-on-ubuntu-12.04-precise-pangolin (depending on your particular Ubuntu version) on how to enable compiz. I am almost certain that once you have done so, you will also run see the distorted graphics, but you now...

...convert to ogg vorbis format for use in my car and portable player. I don't usually notice anything amiss, but on the last track of Mike Oldfield's "Music of the Spheres" album ("Musica Universalis", at the very end crescendo), the converted .ogg file exhibits terrible distortion (sounds like digital clipping). This does not occur with MP3 or WMA formats. I used a quality factor of 4. Does oggenc raise the amplitude (to cause digital clippiing)? Any idea why this happens? Also, my previous experience with ogg vorbis format is that it provide nice, seamless gapless trans...

Hi, I have tried using the VorbisEncoder class available with the vorbis-java port of the ogg-vorbis and shout and the resulting ogg file from the encoder is jumbed up and distorted. I have tried compiling the sources and changing the quality in the source with no success. Has anyone managed to use the encoder successfully. if so your response will be of great. -- Solomon Kariri, Software

I'm new to * and I have my * box connected to another * box located at my ISP via iax2. Using ilbc everyting works fine but with any other codec I've tried (gsm, ulaw, alaw) there is severe distortion on the sound going out of my box as well as a second or two of delay. The incoming sound quality is fine. This happens even if the outgoing sound is coming from the voice mail prompts on my *. Any ideas what I should be looking for? -- Ray

For whatever reason, the music on hold is extremely distorted and loud. It didn't used to be this way and I haven't changed anything, yet it persists. This is on all the channels we use (SIP, IAX2, Zap, ALSA). Can anyone help with this, or has anyone seen this? The mp3s play fine on any computer and haven't changed since they did work. Those wishing to hear for themselves, feel

...them, although on these calls the remote party is quieter than usual. They can hear us just fine. But when we speak, our side becomes heavily distorted. It only happens when we speak. As long as we are not talking, the audio is fine other than the remote party is not as loud as normal. The distortion sounds a lot like what a speaker sounds like when it is blown. Not quite static, not quite feedback, but very crackly and metallic with pops and squeals. It drowns out all other sound on the call. We hear it very loud, almost painfully and you have to hold the handset away from your ear as...

https://bugs.freedesktop.org/show_bug.cgi?id=104897 Bug ID: 104897 Summary: nouveau memory allocation issue causes screen distortions under KDE Product: xorg Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: major Priority: medium Component: Driver/nouveau Assignee: nouveau at lists.freedesktop.org...