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Hello Jean-Marc, I solved the variable delay problem, but I still have trouble with speex_echo_cancel(). When i try testecho.c with clean speech for far-end input and same speech with attenuation, a bit of reverb and 50-150 ms delay, all this done in sound editor, for mic input, i get 5-8 db attenuation. But when i use the same speech played and recorded for mic input, i see about 5 db of attenuation only if i remove the delay (150ms) at the beginning of mic input file to make far-...

Hi, For very large matrices, is this the most efficient way to add two variables together? ############################# attach(attenu) new<-rowSums(cbind(mag, station)) ############################# Also, could I be directed to some resources for working with very large datasets? Thanks

...gt; > > I'm pretty much sure of it. When I test inverting > > the > > > inputs, my output is pretty much the same as my > > > speaker signal. Whereas the way that I normally > > test > > > the output is my mic signal with very little > > > attenuation. > > > If you are interested I can send my test files; > > they > > > are about 94KB each. > > > > > > -Jason > > > > > > --- Jean-Marc Valin > > <jean-marc.valin@usherbrooke.ca> > > > wrote: > > > &gt...

I ran some further tests on mdf and here are the results: 1. reduced tail length to 100ms, aligned mic and speaker signals to within 10ms - almost no echo attenuation 2. aligned mic and speaker signals to within 5 samples - still almost no echo attenuation 3. ran testecho using the same file for mic and speaker - very good echo cancellation (of course this is expected, but I needed to do a sanity check) 4. ran the same file for mic and speaker, but had the...

I'm pretty much sure of it. When I test inverting the inputs, my output is pretty much the same as my speaker signal. Whereas the way that I normally test the output is my mic signal with very little attenuation. If you are interested I can send my test files; they are about 94KB each. -Jason --- Jean-Marc Valin <jean-marc.valin@usherbrooke.ca> wrote: > Are you sure you're not just inverting the two > inputs? > > Jean-Marc > > On Wed, 2005-11-09 at 22:16 -0800, Jason...

Hello Jean-Marc and all, I?ve got a problem with speex_echo_cancel usage. I only managed to get an attenuation of 5-8 db using testecho.c and it depends heavily on the playback/capture delay. I used clear speech as far-end input and same speech with a bit of reverb, attenuation and delay as mic nput. I also tried using played and recorded speech for mic input. I tried different constant delays and got...

...t; > inputs, my output is pretty much the same as > > > my > > > > > > speaker signal. Whereas the way that I > > > normally > > > > > test > > > > > > the output is my mic signal with very little > > > > > > attenuation. > > > > > > If you are interested I can send my test > > > files; > > > > > they > > > > > > are about 94KB each. > > > > > > > > > > > > -Jason > > > > > > > > > >...

...gt; > the > > > > > inputs, my output is pretty much the same as > > my > > > > > speaker signal. Whereas the way that I > > normally > > > > test > > > > > the output is my mic signal with very little > > > > > attenuation. > > > > > If you are interested I can send my test > > files; > > > > they > > > > > are about 94KB each. > > > > > > > > > > -Jason > > > > > > > > > > --- Jean-Marc Valin > >...

...0800, Jason > Harper a ?crit : > > I'm pretty much sure of it. When I test inverting > the > > inputs, my output is pretty much the same as my > > speaker signal. Whereas the way that I normally > test > > the output is my mic signal with very little > > attenuation. > > If you are interested I can send my test files; > they > > are about 94KB each. > > > > -Jason > > > > --- Jean-Marc Valin > <jean-marc.valin@usherbrooke.ca> > > wrote: > > > > > Are you sure you're not just inver...

Hello Jean-Marc, I solved the variable delay problem, but I still have trouble with speex_echo_cancel(). When i try testecho.c with clean speech for far-end input and same speech with attenuation, a bit of reverb and 50-150 ms delay, all this done in sound editor, for mic input, i get 5-8 db attenuation. But when i use the same speech played and recorded for mic input, i see about 5 db of attenuation only if i remove the delay (150ms) at the beginning of mic input file to make far-...

...beta1: https://trac.xiph.org/changeset/11882 Jean-Marc julia rg a ?crit : > Hello Jean-Marc, > > > > I solved the variable delay problem, but I still have trouble with > speex_echo_cancel(). When i try testecho.c with clean speech for far-end input > and same speech with attenuation, a bit of reverb and 50-150 ms delay, all this > done in sound editor, for mic input, i get 5-8 db attenuation. > > > > But when i use the same speech played and recorded for mic input, i see about 5 > db of attenuation only if i remove the delay (150ms) at the beginning...

...When I test > inverting > > > the > > > > inputs, my output is pretty much the same as > my > > > > speaker signal. Whereas the way that I > normally > > > test > > > > the output is my mic signal with very little > > > > attenuation. > > > > If you are interested I can send my test > files; > > > they > > > > are about 94KB each. > > > > > > > > -Jason > > > > > > > > --- Jean-Marc Valin > > > <jean-marc.valin@usherbrooke.ca&...

Thanks for alerting me to the new changes. I just tried the latest code from SVN, but unfortunately I still have just about the same results. The estimated echo that gets subtracted from the actual echo is such a small signal that it doesn't really result in any noticeable echo attenuation. I currently have my filter size set to 2 seconds even though the echo in my microphone file is only about 180ms delayed from the signal in my speaker file. I also double checked that the endianess of my is correct, and that I am providing the files to testecho in the correct order. Do you th...

...gt; > the > > > > > inputs, my output is pretty much the same as > > my > > > > > speaker signal. Whereas the way that I > > normally > > > > test > > > > > the output is my mic signal with very little > > > > > attenuation. > > > > > If you are interested I can send my test > > files; > > > > they > > > > > are about 94KB each. > > > > > > > > > > -Jason > > > > > > > > > > --- Jean-Marc Valin > >...

...Maine or Miami.) It is insightful, yet... There are a bunch of other factors that may need to be taken into account. Angular transmission pattern of satellite (horn? or is it yagi? antenna) vs ground based (monopole? or dipole? antenna - which one is used there to transmit in HF?). Ground effect (attenuation) along the whole path or propagation for ground based HF vs ground effect only at the receiption point, but much higher for much higher frequencies of GPS; pre-amplifier Signal to Noise ratio (S/N; which can technically be achieved to be much better at much higher GPS frequencies...). So, 70 k...

...sure you're not just inverting the two inputs? Jean-Marc On Wed, 2005-11-09 at 22:16 -0800, Jason Harper wrote: > I ran some further tests on mdf and here are the > results: > 1. reduced tail length to 100ms, aligned mic and > speaker signals to within 10ms - almost no echo > attenuation > 2. aligned mic and speaker signals to within 5 samples > - still almost no echo attenuation > 3. ran testecho using the same file for mic and > speaker - very good echo cancellation (of course this > is expected, but I needed to do a sanity check) > 4. ran the same file for...

...nto the > frequency domain by a spectral transform (ST). Based on these input signals, the control unit of > the Acoustic Echo Control determines an optimum gain factor for each individual frequency > band separately. These frequency dependent gain factors are also referred to as echo > attenuation filters. Obviously, the gain factors are selected to be close to zero in circumstances > where strong echo components need to be removed from the microphone signal. On the other > hand, in the event of near-end speech only, it is set to one in order to leave the desired speech > signa...

...t; > inputs, my output is pretty much the same as > > > my > > > > > > speaker signal. Whereas the way that I > > > normally > > > > > test > > > > > > the output is my mic signal with very little > > > > > > attenuation. > > > > > > If you are interested I can send my test > > > files; > > > > > they > > > > > > are about 94KB each. > > > > > > > > > > > > -Jason > > > > > > > > > >...

...+ e and assume each true score to a have a certain amount of correlation with some of the other true scores. The correlation matrix cx of x will have its off-diagonal entries reduced by measurement error compared to the true correlation matrix ct of t, however the diagonal entries remain without attenuation. Consequently the correlation matrix of observed variables has different things on- and off-diagonal. I would like to estimate 1) the true correlation matrix ct 2) the measurement reliabilities rxx, i.e. the correlation of a score with itself attenuated by its measurement error (as if we ha...

...m?pub_id=50031 ). Please see http://gpsinformation.net/main/gpspower.htm for the relevant data on GPS (25.6W output, 13dBi gain, EIRP 27dBW (about 500W), free space loss of 182dB, -130dBm receive signal strength (0.1 femtowatts, if I've done the calculation correctly)). > Ground effect (attenuation) > along the whole path or propagation for ground based HF vs ground effect > only at the receiption point, but much higher for much higher frequencies > of GPS; pre-amplifier Signal to Noise ratio (S/N; which can technically be > achieved to be much better at much higher GPS frequ...