search for: quantising

The following creates a point process version of a sinewave (maybe there's a better way): p<-amp*cos(2*pi*freq*(1:n)/n ) + 0.5 as.numeric(runif(1:n)<p) I get something like this: 1 o oo oo o o ooooo o 0 ooo o o o o o ooo ooo In case it's not obvious, this is a noisy version of 1 ooooooo ooooooo 0 ooooooo

...#39;m only an audio engineer and sorry for my broken english but i have an idea... After the filterbank the maximum aplitude in each band decides about the nessesary bits, then the psychoacoustic model decides how much of the signal can be truncated without hearable noise. What do you think about quantising the remaining bits nonlinear with a logarithmic scale? This would share 25%. Nonlinear quantisation is used for instance in a-law or for the longplay-mode of DAT-recorders. The disadvantages of nonlinear quantisation will not apply here, because the 576 frequency bands are too narrow. The harmoni...

--- libcelt/bands.c | 43 ++++++++++++++++++++++++------------------- libcelt/bands.h | 6 ++---- libcelt/celt.c | 6 ++---- 3 files changed, 28 insertions(+), 27 deletions(-) diff --git a/libcelt/bands.c b/libcelt/bands.c index d0c3498..315cce8 100644 --- a/libcelt/bands.c +++ b/libcelt/bands.c @@ -247,23 +247,6 @@ void compute_pitch_gain(const CELTMode *m, const celt_norm_t *X, const

Hi guys, Here's two patches I'm planning to apply to simplify the pitch quantisation. Can you test them and let me know how it works? Thanks, Jean-Marc -------------- next part -------------- A non-text attachment was scrubbed... Name: 0001-Moved-the-application-of-the-pitch-gain-to-un-quant.patch Type: text/x-patch Size: 8182 bytes Desc: not available Url :

...g Vorbis becomes a success. Which is evil, and I'm also mad at them because they never answered my mail (which was about how to get an mp3 patent license, of all things). But I digress. Thing is, I understand that they have a patent on compressing audio by transforming to the frequency domain, quantising, and then entropy encoding, which is what Ogg Vorbis does, so there's trouble. Now, I've been working on a Haar wavelet image compressor, and since I haven't written the entropy coder yet I just dump my quantised output to a new file. This file is as large as the original file. Then I s...

--- libcelt/Makefile.am | 6 +- libcelt/bands.c | 26 +++++++++- libcelt/bands.h | 2 +- libcelt/celt.c | 23 +++----- libcelt/pgain_table.h | 133 ------------------------------------------------- libcelt/quant_pitch.c | 117 ------------------------------------------- libcelt/quant_pitch.h | 44 ---------------- 7 files changed, 37 insertions(+), 314

I have been using libvorbis for the past few weeks and have been asked to summarise what I have discovered about the codec. There is an early draft of the document at http://www.geocities.com/gatewaystation/vorbis/vorbis.htm - Please forgive the dodgy formatting (it was formerly a MS word document that got converted with their 'save as html' feature). I still have some additions to

...coded the speex file so obtained and it sounded alright.) Also I changed the settings to Quality 2 and complexity 2 in wideband mode and it took 58 sec to encode for the same 1 min file.With these settings I tried to encode the analog input coming thro' line-in of the EDB9302(sampling and quantising done within the board after the line in).But now ,on decoding the speex file (I also tried force decoding nb) i got noise output. What is the solution to this, as i plan to do line-in encoding(as a person speaks encode it on the EDB) ? Can anybody tell me what actually happens when we change...

https://bugzilla.mindrot.org/show_bug.cgi?id=3655 Bug ID: 3655 Summary: Default ObscureKeystrokeTiming makes X forwarding really slow Product: Portable OpenSSH Version: 9.6p1 Hardware: Other OS: Linux Status: NEW Severity: normal Priority: P5 Component: ssh

Hi, I've been reading through the Theora format spec and API reference trying to find an answer to this but haven't come across anything certain. I'm wondering whether it would be theoretically possible to change the encoded bit rate (or target video qiality) during a live stream without a standard theora decoder having any problems. I had assumed that this must be possible, given

> Yes, I have enabled the the current ARM4 assembly bits. I have tried > to optimize these functions(filter_mem16(),iir_mem16() and > fir_mem16()) in C code, but the effect is very small, and I am going > to do assembly optimization for these functions. Do you have another C > code about these functions for assembly optimisations? Can you give me > some information and

Ha ha! I'm don't know what change I made that cleared up the errors, but I can figure that out later. Of course, I immediately tested my new oggenc. Using the same input file and default options, I get these results: [MSVC] File length: 4m 21.0s Elapsed time: 0m 54.0s Rate: 4.8333 Average bitrate: 129.6 kb/s File size: 4,229,428 [BCB]

Hello, I wanted to find out more about square polar mapping, cause that whole stuff is a bit tricky - to me - and not so easy to understand. Searching the web did't get me any results, so I wonder what the background of square polar mapping is. Is it derived from some mathematical publications or just the result of a brilliant intuition of a Vorbis programmer ? ;) Thanks. Stoffke

On Mon, 7 Aug 2023, Chris Rapier wrote: > > The broader issue of hiding all potential keystroke timing is not yet fixed. > > Could some level of obfuscation come from enabling Nagle for interactive > sessions that has an associated TTY? Though that would be of limited > usefulness in low RTT environments. I don't like the idea of having a steady > drip of packets as that

Hi?Jean-Marc? Thanks for your suggestions very much! > > I am porting speex on ARM7TDMI, I have done some optimization, the > > result is that the encoder and decoder need about 60 MCPS for 5.96kbps > > bitrate and complexity 0. Can someone give me informtion about Speex > > optimization on ARM7? > > That's quite good. A few suggestions here: > 1) Don't

Hi, I've read the Vorbis stereo documentation on square polar mapping and currently reading the source code to understand it. But there are some things which I don't quite understand and hope I can get some guidance on. I understand the decoding/decoupling part as it is the same as the one described in the stereo docs: From mapping0.c: /* channel coupling */

...way: * Do we need to decode anything; could an X11 driver force-feed the raw bytes to hardware instead? Claim 22 seems like a pretty important step and possibly a hard one to workaround but it also appears to be claiming the invention of using a key lookup to fetch values with some vague notion of quantising them. Is it just me or are they claiming to have invented indexed color? PS. If some of the points above seem pedantic that's deliberate. My understanding is that patent claims are actually intended or required to be NARROW in scope as broad claims are usually rejected. That means a workaround...

I sent a little mail some time ago asking if there was going to be an ogg pic-format, and you replied that PNG, MNG and JNG is good enough (sorry for this late answer btw).. But, consider this: The ogg video-format (tarkin ? where do you get these names from anyway ? :) ) needs a way to compress its frames. Are you going to use MNG for that ? :) .. If you had an ogg pic format, that format could

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Hello everybody, first of all I want to excuse myself for crossposting. I can't estimate which mailinglist could be the right one for our concern. Struktur AG, member of the Linux Solutions Group e.V., wants to announce an Open Source tender for an implementation of an audio codec compatible with Nellymoser Asao Codec. Struktur wants to pay

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Hello everybody, first of all I want to excuse myself for crossposting. I can't estimate which mailinglist could be the right one for our concern. Struktur AG, member of the Linux Solutions Group e.V., wants to announce an Open Source tender for an implementation of an audio codec compatible with Nellymoser Asao Codec. Struktur wants to pay