search for: resampling

Hi, I just built a sample application with speex resampler in linux and I tried to resample 8K sine wave tone mono to 48k using speex_resample_process_int. I am using a tool called EAQUAL for audio quality. I find the quality of Speex resampler to be decreasing when I increase the quality q of the resampler init function. Can some one give me pointers regarding this?? As per the API, if the

Hi, I am new to R (I have most of my experience in SAS and SPSS). I was wondering if anyone has used both Resampling Stats and R, and could comment on strengths/relationships. Also, I have no clue on how to do the various examples from the book "Resampling: The New Statistics" in R. Can anyone give me some possible starting points? Or websites/books? Thanks, Brandon

...the Speex resampler a while ago (and IIRC they were accepted): http://lists.xiph.org/pipermail/speex-dev/2009-November/007541.html , http://lists.xiph.org/pipermail/speex-dev/2009-November/007542.html , http://lists.xiph.org/pipermail/speex-dev/2009-November/007525.html . Is there any chance the resampling code could be spun off into a separate library? A commercial-license-friendly resampler would be really helpful (I needed one myself), and a single unified library would make it a lot easier to track updates and patches. I've spun off the resampler parts some time ago when I was working on a pr...

Hi List, Now I will send to you more specific what I am trying to do. I have one Asterisk Channel where receives Midia Frames in the codecs format: Speex UltraWideBand and Speex NarrowBand. When I use Speex NarrowBand the Asterisk is able to convert this frame to G711. But when I use Speex UltraWideBand the Asterisk don't convert it. Then I need in my Asterisk Channel Source include the Speex

From: Jyri Sarha <jsarha at ti.com> This bug happens quite often when resampling from a low to a high sample-rate with big enough factor. Also the resampling call has to be limited by the output buffer size and some unused samples needs be left in the input buffer. Sometimes when up-sampling with a big factor the resampling function wants to peek one more sample from the input...

...ren't any obvious artifacts. I also did a 16=>16 test, and the >> results are delayed by 10ms and within +/- 1 (basically, rounding errors >> from the FFT). >> > > Do you plan to use it in VoIP environment? If so, 10ms of additional latency > is a big cost for resampling. Do you think there are any ways to reduce it? > Yes, I plan to use it in a VoIP environment if I can get latency reduced to an acceptable level :) The latency depends directly on the overlap parameter, which also controls the quality. Higher quality => higher latency. You could set the...

Attached is a snapshot of work-in-progress of a FFT based resampler. At the moment it works in floating point only, and only basic quality inspection has been done. Some benchmarks comparing the filter-based resampler at Q3 with the FFT resampler with overlap = in_len / 2, using 20ms chunks of data. (-O3 -ffast-math, FFTW3, gcc 4.3.0 on x86_64) 16=>48: 59us vs 19us 16=>44.1: 204us vs

Hi I'm having a problem compiling opus-tools-0.1.7. Version opus-tools-0.1.6 seems to compile OK. I've tried with opus-1.0.3 and opus-1.1-beta. The errors are like this:- "undefined reference to `sqrtf'" etc. This OS is Peppermint Three, similar to Ubuntu 12.04. It uses:- gcc --version gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3 Google says it's maybe something to do

I was attempting to use the residual resampling approach to generate 999 bootstrap samples of alpha and beta and find their confidence intervals. However, I keep getting the error message:Error in nls(resample.mp ~ cases/(alpha + (beta * cases)), start = init.values, : singular gradientafter R has only produced a few bootstraps.Could an...

Hi, *"That's in general not very reliable. You can get PEAQ to say all sorts of silly things." Can you provide me links for any more effective tools other than PEAQ? Which is more reliable for Speex resampler? * *"strongly suspect that it's just not compensating for the delay introduced by the resampler. Because higher quality means higher delay, you'd find that PEAQ

Hi, Seems like it's not linking with libm. I suspect it has to do with linking statically with libopus.a (is that intended?). Maybe opus-tools relies on the fact that libopus is linked with libm and doesn't explicitly add it? Greg? Jean-Marc On 09/24/2013 06:09 AM, bat guano wrote: > Hi > I'm having a problem compiling opus-tools-0.1.7. > Version opus-tools-0.1.6 seems to

Hi, I understand bootstrap can be used to estimate 95% confidence interval for some statistics, e.g. variance, median, etc. I have someone suggesting that by resampling certain proportion of the total samples (e.g. 80%) without replacement, we can also get the estimate of confidence intervals. Here we have an example of 1000 obsevations, we would like to estimate 95% confidence intervals for odds ratio for a diagnostic test, can I use resampling 80% of the observa...

Hello, some misc. cleanup patches for speexdsp, nothing big I'm not sure about how to submit patches, so this is a test balloon :) ultimately, I'd like to fix the FIXED_POINT issue, see http://lists.xiph.org/pipermail/speex-dev/2013-December/008465.html currently, I think the only way to find out how speexdsp has been compiled is to resample some bytes and observe the output; which is

...=>16 test, and the > > > results are delayed by 10ms and within +/- 1 (basically, rounding errors > > > from the FFT). > > > > > > > > > > Do you plan to use it in VoIP environment? If so, 10ms of additional > latency > > is a big cost for resampling. Do you think there are any ways to reduce > it? > > > > > Yes, I plan to use it in a VoIP environment if I can get latency reduced to > an acceptable level :) > The latency depends directly on the overlap parameter, which also controls > the quality. Higher quality =&g...

...output. If doesn't matter what it gets encoded to/decoded from. > you can initialize a decoder at 8 kHz and it'll still decode 48 kHz > audio fine (you just won't get the high frequencies obviously). For > sampling rates other than 8/12/16/24/48, then you'll have to do > resampling. Have a look at the speexdsp resampler if you don't already > have one. > > Cheers, > > Jean-Marc > > On 02/04/15 10:42 AM, Julien Chavanton wrote: > > Hi, is there any way to tell the decoder the output sampling Fz we want ? > > > > opus_decoder_c...

If you can produce a simple minimal repro that exhibits this issue on some procedural signal (sine wave, etc) I'd love to look into it some more - I'm maintaining a hardened version of the Speex Resampler and would be very concerned if this bug made it into production. - Sherief -----Original Message----- From: speex-dev-bounces at xiph.org [mailto:speex-dev-bounces at xiph.org] On

...may be > infinite, no? :) > Higher block size and more overlap => higher CPU. The idea is to let the block size be whatever block size you use for the rest of your program. For Speex, 20ms is perfect. Lower overlap will give less CPU requirements, but also introduce artifacts in the resampling. >> It could be 50% overlap is complete overkill. It could be it's not enough. >> It could be how much overlap you need depends on the block size. I need to >> do some quality testing before I can say for sure :) >> > *nod* > Also comparison with standard res...

...d is the 0->8khz range (full original signal), and the last is the full range. The reason I split it is that the filter-based resampler has cutoff filter, so it zeroes out frequencies near the nyquist. So the SNR is unfair for the 0->8 range. Anyway, on to the results. First, a 16=>16 resampling. Filt Q10: Diff 0.883327, SNR 3.12531e-07 / 0.472589 FFT 320: Diff 0.00292969, SNR 2.57974e-07 / 4.77473e-05 Both resamplers will recreate the original samples. The filter based does limit the upper part of the signal. Both resamplers deal fine with 16=>48, so let's skip directly to 16=&gt...

...ace=T)) rj.stat <- sapply(rj.repl, stat) rj.stderr <- sqrt(var(rj.stat)) list(std.err=rj.stderr, resamples=rj.repl, stats=rj.stat) } b.sum <- cbind([, rj.stat]) } b.sum <- b.stat(dat$counts, sum) -- View this message in context: http://r.789695.n4.nabble.com/repeat-resampling-with-different-subsample-sizes-tp4655927.html Sent from the R help mailing list archive at Nabble.com.

Hi, I just started to examine the DIV32_16 function (Blackfin ASM version), and wondered why the return value of the function inside 'fixed_bfin.h' is of type 'spx_word16_t', but the local variable 'res' which is returned by this function is of type 'spx_word32_t'. Is this a trick of optimization or a bug? (Same question for PDIV32_16 and MAX16, too!) best