search for: zlast

This small patch will make st->Zlast = Zframe, to allow applications access to an estimate of the signal-to-noise level. This used to be in there earlier, but was removed when Zlast was no longer used to compute Pframe. -------------- next part -------------- Index: preprocess.c ===================================================...

...libspeex\mdf.c(317): error: declaration may not appear after executable statement in block float adapt_rate; Just moved it up to the variable declaration block to solve it locally, but as it's not valid C, I thought I'd mention it ;) PS: With the same compiler, AGC fails horribly (Zlast goes to several million). Not quite sure where to begin with debugging, and the problem is "solved" by switching to the MSVC compiler, but that compiler doesn't produce as fast code.

...X[1:(t-h)]), 0:i) + L(as.ts(z[1:(t-h)]),0:j)) # y, X, z are a zoo objects defined earlier; i and j, t, h are given earlier; h is the forecasting horizon; since dynlm can't work for zoo object, the variables need to be transformed to ts objects. Xlast<-as.matrix(X[(t-h):(t-h-i+1)]) zlast<-t(as.matrix(z[(t-h):(t-h-j+1)])) # Make it a column matrix beta<-as.matrix(model$coefficient) pi1fore[t]<-pi1[t-h]+c(1, Xlast, zIlast)%*%beta # pi1fore is defined earlier . I just use the inner product as a vehicle for forecasting. I don't know if there's a way that the co...

...xed" in some way before 1.2. OK, it's good to have that information. I'll try to fix that before 1.2. > I used to grab quite a few bits of data directly from the > SpeexPreprocessState structure. I have a Audio Statistics window in my > application which would show SNR info (Zlast), the speech probability > and a graphical view of ps and noise. This really helped users to > improve the quality of their input, as they could clearly and > immediately see the effect of changes in the environment. > These data are now private and can't easily be extracted from an...

...;s clearly audible on the other side. If I cough or say a word, the AGC readjusts and all is fine. Looking at the members of the speex_preprocess structure, I see that during these long periods of "silence" (only the background music or only the other end talking while I shut up): - Zlast (which looks like a SNR variable) is at 0.05-0.2, but jumps up above 1.0 if I actually say something. - loudness2 keeps decreasing from the "normal" of ~6000 to 1000 or so, at which point the residual echo is amplified enough that it's clearly audible at the other end. If I s...

...de. If I cough or say a word, the AGC readjusts and > all is fine. > > Looking at the members of the speex_preprocess structure, I see that > during these long periods of "silence" (only the background music or > only the other end talking while I shut up): > > - Zlast (which looks like a SNR variable) is at 0.05-0.2, but jumps up > above 1.0 if I actually say something. > - loudness2 keeps decreasing from the "normal" of ~6000 to 1000 or so, at > which point the residual echo is amplified enough that it's clearly > audible at t...

...l is fine. > > > > > > Looking at the members of the speex_preprocess structure, I see that > > > during these long periods of "silence" (only the background music or > > > only the other end talking while I shut up): > > > > > > - Zlast (which looks like a SNR variable) is at 0.05-0.2, but jumps up > > > above 1.0 if I actually say something. > > > - loudness2 keeps decreasing from the "normal" of ~6000 to 1000 or so, at > > > which point the residual echo is amplified enough that it'...

...t it also doesn't detect speech as good as before. I'd really like to see this "fixed" in some way before 1.2. I used to grab quite a few bits of data directly from the SpeexPreprocessState structure. I have a Audio Statistics window in my application which would show SNR info (Zlast), the speech probability and a graphical view of ps and noise. This really helped users to improve the quality of their input, as they could clearly and immediately see the effect of changes in the environment. These data are now private and can't easily be extracted from an outside program...

Hi everyone, As you may have guess, Speex 1.2 is slowly approaching, though there's still a lot left to do so I can't say how long it'll take. I thought this was the right time to ask if there's anything missing or that can be improved to make 1.2 better. At this point, it can't be anything major, but there are still some changes that are possible, e.g: - Improving some

...dd. Next test, I delayed the signal added to the mic by one frame and set M=2. Still adapts, but does so much slower. Good. Next test, delay the signal 3 frames, keep M=2. Complete deterioation of state; output is just noise, and the preprocessor starts spitting out NaN values for loudness and Zlast. Repeat with M=5 (mic still delayed 3 frames). Adapts, but does not completely cancel as it did earlier, and has very little cancellation for the "edges" (when the sine wraps from 110 sines/frame back to 10 sines/frame). Repeat with M=5 and mic delayed 8 frames. No cancellation, as e...