search for: acelp

Hello Jean-Marc: I've been watching the speex development from its inception because I and several Tech Startup Connection members have a very important application for this voice encoding/decoding. Further, we are quite familiar with ACELP as implemented in G.729. As far as I know Speex is also ACELP ... yes/no? Question ... what do you see as the advantages of ACELP compared to MP3? I had thought that ACELP yielded much smaller files, but now I'm not sure because I've listened to what I think were 16kbps MP3 files (????...

And the main point of interest is the following: how much difference in SPEEX terms would it be if it were developed with ACELP in mind? (not that i would do an aSpeex codec implementing ACELP, just to know and point my efforts) -- John Villar Gerente de Proyectos Computadores Flor Hard Soft 2058 C.A. www.florhard.com -------------- next part -------------- A non-text attachment was scrubbed... Name: john.villar.vcf Ty...

> I've been watching the speex development from its inception because I > and several Tech Startup Connection members have a very important > application for this voice encoding/decoding. Further, we are quite > familiar with ACELP as implemented in G.729. As far as I know Speex > is also ACELP ... yes/no? No. Speex is CELP (Code-excited linear prediction), but not ACELP (Algebraic CELP). I have nothing against ACELP, but I couldn't use it because of patent issues. > Question ... what do you see as the advantages...

...ceptable for him). VoiceAge asked him to pay some huge amount of USD for (as they said) AMR license. He contacted me to clarify situation with licensing issue. (I'm working in video coding area. So, please be patient if I missed something in audio coding). As I understood the problem is in ACELP algorithm which AMR uses in 6.7kbs mode. Other modes use CELP. He can disable this mode and this will allow him to don’t break law. Am I right? And second question: how can I get full list of patented algorithms used in AMR standard? Could you point me to some resource? -- Best regards, Andr...

Hi all, I'm to hit about aprox the same encoding settings (ie bitrate,filesize, quality) with talk radio shows that are currently encoded with Real Producer in 16kbit acelp (maybe cs-acelp). Currently 2 hours of talk radio encoded in a .rm container yields about 16.3 meg file. With speex in wideband vbr I'm getting very good quality results, but with a larger filesize of 19.1 meg. I'm currently using the command line below in a shell script, $1 is the time...

Hello Jean-Marc: How many bits do you have in a frame please and what is your frame rate? For example, G.729 (ACELP) has 12 bits/frame including VAD and the frame rate is 100/second ... I'm looking for the comparable figures for SPEEX. Thank you. --- B. Mitchell Loebel, CEO, VP Engineering 408 425-9920 InstaFlash International Corporation (formerly Minute-Tape International...

...39;m guessing that the lower rate you mentioned is because of some overhead for VAD in your 6 bytes. At 07:11 PM 5/3/2007 +1000, Jean-Marc Valin wrote: >B. Mitchell Loebel a ?crit : > > How many bits do you have in a frame please and what is your frame rate? > > For example, G.729 (ACELP) has 12 bits/frame including VAD and the frame > > rate is 100/second ... I'm looking for the comparable figures for SPEEX. > >I'm sorry but if G.729 used 12 bits/frame at 100 frames/second, it would >have a bit-rate of 1.2 kbps. G.729 actually uses 10 *bytes* (i.e. 80 >bi...

I was wondering how vorbis fares as a speech codec? I mean can it give similar or better quality as GSM/Toast at the same kind of bitrates/filesize? I'm not worried about streaming but I'd love to be able to create really small voice files. Can anyone give me an idea of filesize for recording time for pure speech based use? love Freya __________________________________________________

I was posed this question: A T1 set up for voice carries 24 conversations on a circuit that is 1.544 megabits/second. Right? Well, if you set that T1 up to carry data and run a link between two IP networks over it, how many SIP conversations could it be expected to carry? How about IAX? How would one extend this calculation to varying bandwidth circuits and various VOIP protocols (MGCP,

...case it matters. > > Jean-Marc > > > At 07:11 PM 5/3/2007 +1000, Jean-Marc Valin wrote: > >> B. Mitchell Loebel a ?crit : > >> > How many bits do you have in a frame please and what is your frame > >> rate? > >> > For example, G.729 (ACELP) has 12 bits/frame including VAD and the > >> frame > >> > rate is 100/second ... I'm looking for the comparable figures for > >> SPEEX. > >> > >> I'm sorry but if G.729 used 12 bits/frame at 100 frames/second, it would > >> have a bi...

Hi, We would like to announce the first release of the Speex project. Speex (http://speex.sourceforge.net) is an open-source (LGPL), patent-free compression format allowing an alternative to expensive proprietary codecs. Unlike Ogg Vorbis which compresses general audio, Speex is designed especially for speech. For that reason, Speex is meant to be a complement to Vorbis. Since it is specialized

B. Mitchell Loebel a ?crit : > How many bits do you have in a frame please and what is your frame rate? > For example, G.729 (ACELP) has 12 bits/frame including VAD and the frame > rate is 100/second ... I'm looking for the comparable figures for SPEEX. I'm sorry but if G.729 used 12 bits/frame at 100 frames/second, it would have a bit-rate of 1.2 kbps. G.729 actually uses 10 *bytes* (i.e. 80 bits) per frame. Speex...

...you put multiple frames in a packet, in which case it matters. Jean-Marc > At 07:11 PM 5/3/2007 +1000, Jean-Marc Valin wrote: >> B. Mitchell Loebel a ?crit : >> > How many bits do you have in a frame please and what is your frame >> rate? >> > For example, G.729 (ACELP) has 12 bits/frame including VAD and the >> frame >> > rate is 100/second ... I'm looking for the comparable figures for >> SPEEX. >> >> I'm sorry but if G.729 used 12 bits/frame at 100 frames/second, it would >> have a bit-rate of 1.2 kbps. G.729 actu...

Hello, I am really curious about something. How does the quality of Opus compare to alternative VoIP codecs like AAC-ELD V2 and EVS? I heard that the use of ACELP in EVS and AAC-ELD offers a slight improvement in low bit rate performance relative to Opus but then I also heard that the improvement is insignificant. Thanks for taking the time to read my question. -- mo -------------- next part -------------- An HTML attachment was scrubbed... URL: <http:...

.... Other than that, if you want to > do things like include all .c in the same file, just #undef the what you need. > Well, that's exactly what I did. What about all these patents that cover amr and g72X codecs. Are there many of them? Since speex doesn't use these algorithms (like acelp) does it mean that it's inferior to amr for example?

...in the * Inmarsat Mini-M and M4 at 3.6kbps and Iridium at 2.4 kbps). * A few years ago * I did an evaluation of 4kbps speech codecs for a * low-earth-orbit satellite * operator (now defunct). AMBE+ at 4kbps was intended to be a * "toll quality" * codec, with MOS scores similar to ACELP 8kbps. It was * clearly better than * the couple of other 4kbps codecs which we tested, and MUCH * better than * LPC10. * * Now, AMBE builds in forward error correction, which gives the most * redundancy to the most important vectors in the encoded * speech. This is * optimized for circui...

Dear Speex developer(s), We are currently in the process of evaluating speech codecs for the transmission of wideband speech (fs=16kHz) at bitrates lower than 32 kb/s. Speex is a contender for this task. Practically we would have to port Speex to a specific 16 bit DSP if we would go for this. We should be able to handle this. But we would like to ask for your opinion regarding patent

Thanks for the reply. We are currently using AMBE (4Kbps) for our Traffic/Weather Channels. If you have ever had a chance to hear the service, you will know that AMBE does not do us well. I understand that 2Kbps is low quality, but any poorer than AMBE? If can get a decent quality for other low bandwidth talk channels, such as about 10-16Kbps and have it sound rather clean, then I would be

...sible, the judges/jurys have > litttle technical insight. I do not know of any patent that Speex would be infringing. More specifically, I have mainly written Speex based on technologies from the 80s for which any patent would have expired. For example, patents are the reason Speex does not use ACELP. > - Are there any products on the market, selling in large quantities, > that incorporate Speex? Yes. Speex is shipped in large companies by companies like Google (Google Talk), RedHat/Novel (and most other Linux companies), and many game companies (e.g. UT2004). I've even hear MS'...

On Wed, Oct 1, 2008 at 6:34 AM, Andrew Joakimsen <joakimsen at gmail.com> wrote: > On Sun, Mar 23, 2008 at 11:34 PM, Tilghman Lesher > <tilghman at mail.jeffandtilghman.com> wrote: >> It is completely illegal in any country that recognizes patents. > > You mean countries that recognize software patents, right? As resident of country where the file is hosted - yes we