search for: 20db

...est wtih my recording file offline through the testecho. I got the same result(no prepocessor echo suppression) as my recording file for that live call. Basically I don't see the difference between input_frame and output_frame. As I mentioned in my original post, the echo return loss is about 20db. I guess the echo cancelleris not really actively cancelling the echo in such condition? But without the echo sppression/NLP, echo is still noticable. I used the same onboard sound card for the speaker and microphone. As far as I can tell, the delay between echo_frame and input_frame is consiste...

...est wtih my recording file offline through the testecho. I got the same result(no prepocessor echo suppression) as my recording file for that live call. Basically I don't see the difference between input_frame and output_frame. As I mentioned in my original post, the echo return loss is about 20db. I guess the echo cancelleris not really actively cancelling the echo in such condition? But without the echo sppression/NLP, echo is still noticable. I used the same onboard sound card for the speaker and microphone. As far as I can tell, the delay between echo_frame and input_frame is consiste...

...t wtih my recording file offline through the testecho. I got the same result(no prepocessor echo suppression) as my recording file for that live call. Basically I don't see the difference between input_frame and output_frame. As I mentioned in my original post, the echo return loss is about 20db. I guess the echo canceller is not really actively cancelling the echo in such condition? But without the echo sppression/NLP, echo is still noticable. I used the same onboard sound card for the speaker and microphone. As far as I can tell, the delay between echo_frame and input_frame is consi...

...1 codec, frame_size 80 and both 1024 and 2048 tail length. The code was compiled as floating point and fixed point in the PC. But noneof them help. I made sure the the synchronization between echo_frame and input_frame was stable and the delay is consistant about 10ms. The echo return lossis around 20db but output_frame and input_frame signal is about the same. I even tried Jean-Marc's latest mdf.c from the subversion but no luck. Has anyone test the performance in any other softphones and how well does it work? I have the recording files, anyone would be interesting in taking a look? I won...

Hi, I set "alaw = 1-7" in /etc/zaptel.conf hoping to make my zap channels the same as the PSTN. This caused the levels to be about 20dB too high, as well as being distorted. I adjusted the txgain and rxgain settings in /etc/asterisk/zapata.conf to sane levels, but now I still have rather distorted zap extension -> zap extension sound quality. What am I missing here ? zap 1-4 are phone extensions, and zap 5-7 are telco lines. A...

I have a simple question: I want to mix N samples of 20ms into one sample of 20ms...is the algorithm above exact? : short inputsamples[160][N]; short outputsample[160]; int i,j; for(i=0;i<160;++i){ outputsample[i] = 0; for(j=0;j<N;++j){ outputsample[i] += inputsample[i][j]; } outputsample[i] /= N; }

Hi, I searched the Internet to find an answers, but I didn't find anything useful, so I'm turning to you, maybe someone has the answer. I want to make a realtime broadcast from a Linux box. The source is the soundcard's line-in, and it sends the stream to an Icecast server. I would like to have realtime compressor/limiter functionalities on this Linux box, so the outgoing signal

At 11:40 AM 11/14/2001 -0500, sublime@mac.com wrote: >the ACG function that the compressor provides is limited at best. its >adjustment is way too audible to make full use of it in balancing levels. >yes, it is last in the chain. i'm just wondering if there's anything out >there in the way of software. if a minidisc recorder can do it, why can't a >$1000 pc? tons of

...: Sep 20 15:40:31 rmbp kernel: pcm4: +-------------------------+ Sep 20 15:40:31 rmbp kernel: pcm4: | DUMPING Volume Controls | Sep 20 15:40:31 rmbp kernel: pcm4: +-------------------------+ Sep 20 15:40:31 rmbp kernel: pcm4: Sep 20 15:40:31 rmbp kernel: pcm4: Microphone2 Volume (OSS: monitor): 0/20dB Sep 20 15:40:31 rmbp kernel: pcm4: | Sep 20 15:40:31 rmbp kernel: pcm4: +- ctl 8 (nid 14 out): 0/20dB (3 steps) Sep 20 15:40:31 rmbp kernel: pcm4: Sep 20 15:40:31 rmbp kernel: pcm4: Recording Level (OSS: rec): 0/20dB Sep 20 15:40:31 rmbp kernel: pcm4: | Sep 20 15:40:31 rmbp kernel: p...