search for: celp

Hello Jean-Marc and all, I recently had a talk with somebody about CELP. He said, there is this federal standard 1016 (4.8kbps) with a reference implementation of the Department of Defense (only on Sun, unfortunately, if I got this right). This one is noticed in the manual already. He also said, since there is this implementation of the DoD, nobody would voluntarily r...

What??s happening with this following code: require(sem) Celpe.Mod.RAM <- matrix(c( # path parametro Inicio "Produ????o -> T1", "gamma.11", NA, "Produ????o -> T2", "gamma.12", NA,...

...rames since they will know that those will be handled in the final recording. With that bit of background, my question is: Since the resulting recorded quality is the ONLY concern, and since we can stipulate that all parties will always have access to broadband-scale connectivity, does using a CELP-based codec such as Speex make the most sense in this application? I would be running Speex in ultra-wideband with 32 or 48 kHz sampling and its bitrate completely open-ended and upwards of 44 kbps ... but higher bit rates (of several hundred kbps) would also be readily available to this appli...

...----- echo comp 8, bitrate 16000 time ../src/speexenc -w --bitrate 16000 --comp 8 test-gab.pcm test-gab_b16000_c8.arm.spx Here are the results I got: -------------------------------------------------------------------------- comp 0, bitrate 6600 Encoding 16000 Hz audio using wideband (sub-band CELP) mode (mono) real 0m5.286s user 0m4.560s sys 0m0.420s -------------------------------------------------------------------------- comp 0, bitrate 8000 Encoding 16000 Hz audio using wideband (sub-band CELP) mode (mono) real 0m4.836s user 0m4.510s sys 0m0.250s -------------------...

Hello kind developers, I am planning on creating a steganographic extension for speex/CELP. Since speex/CELP is lossy, there should be quite many bits that one can use for hiding data. I'm familiar with the principles of CELP (two filter loops, one for pitch, the other for formants, let the raw speech frame run through those filter loops, take residue signal, map it on a codebook en...

Am Dienstag, 13. Mai 2003 03:22 schrieb Allen Drennan: > Hello, > > HawkVoice doesn't have a 6.3kbps codec for CELP, it has a 4.5kbps CELP > codec and I do not believe it is being used by TeamSpeak. The 6.4kbps CELP > being used in TeamSpeak, to which you are referring I believe comes from > Lernout & Hauspie's LHACM.ACM file which it appears you are redistributing > (I assume TeamSpeak has...

...sion that supports speex codecs. The quality for high bitrates is quite good. BUT, the low-bandwidth speex codecs that are currently used arent very good. What I did to find this out: I comprared a speex AVB with 6.3 KBit/sec (total, overhead for packets and stuff included) and the 6.3 Kbit/sec Celp Codec vom hawkvoice ( http://www.hawksoft.com/hawkvoice) and the result is quite favorable for hawkvoice. I cant believe that this is *normal* speex behavior, please correct me if that hawkvoice thing just performs better on that bandwidth. Now for my question: Could you please tell me what op...

...eptable 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 i have file based on PHILIPS celp mpeg-4 is it possible to open this file using speex?? or your company codec? file is attached in this email Best Regards Pozdrawiamy Zesp?? Net Com -------------- next part -------------- A non-text attachment was scrubbed... Name: vsi.img Type: application/octet-stream Size: 323274 bytes Desc...

Hello, HawkVoice doesn't have a 6.3kbps codec for CELP, it has a 4.5kbps CELP codec and I do not believe it is being used by TeamSpeak. The 6.4kbps CELP being used in TeamSpeak, to which you are referring I believe comes from Lernout & Hauspie's LHACM.ACM file which it appears you are redistributing (I assume TeamSpeak has a license and permis...

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...

...ev@xiph.org] On Behalf Of Peter Kirk Sent: Tuesday, May 13, 2003 11:55 AM To: speex-dev@xiph.org Subject: Re: [speex-dev] reommended settings for low bitrate voicecom codec ? Am Dienstag, 13. Mai 2003 03:22 schrieb Allen Drennan: > Hello, > > HawkVoice doesn't have a 6.3kbps codec for CELP, it has a 4.5kbps CELP > codec and I do not believe it is being used by TeamSpeak. The 6.4kbps CELP > being used in TeamSpeak, to which you are referring I believe comes from > Lernout & Hauspie's LHACM.ACM file which it appears you are redistributing > (I assume TeamSpeak has...

...managed to get the C55x code working on the simulator. I would like to port Speex both on a C5502 EVM and a C5509A EVM. As such, if you can provide me with the details of your port on the C5509A, it would be greatly appreciated. Furthermore, I am looking for some technical documentation on the CELP algorithms. I would like to better understand the math being implemented. Do you know where such documentation can be found? Sincerely, Jean Quirion _____ From: Jim Crichton [mailto:jim.crichton@comcast.net] Sent: Thursday, July 19, 2007 10:54 AM To: Quirion, Jean; speex-dev@xiph.or...

...sible to attain lower (compared to Ogg Vorbis/MP3) bit-rates in the 8-32 kbps/channel range. Possible applications include Voice over IP (VoIP) applications, Internet audio streaming at low bit-rate and archiving of speech data (e.g. voice mail). This first version of Speex supports fixed bit-rate CELP coding at 14.5 kbps for speech sampled at 8 kHz (narrowband) and at 28.5 kbps for 16 kHz (wideband) speech. Future releases will likely provide a wider choice of bit-rates, better quality, as well as variable bit-rate (VBR) and discontinuous transmission (DTX). Disclaimer: Note that this is a pre...

Hello I'm working about audio and video codecs. I'm making a research about the state-of-the-art in coding technologies. My question is about the speex codec 1.0. I would like to know the name of the algorithms that it uses.(LPC,CELP..). It uses more or less the same algorithm for narrowband and wideband? Finally i would like to ask about future codec developement projects. Thanks for all!!!!! --- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this...

> I am planning on creating a steganographic extension for speex/CELP. > Since speex/CELP is lossy, there should be quite many bits that one > can use for hiding data. Quite the opposite. Speex uses very few bits, so every bit you corrupt is likely to be heard. You would need to use "fractions of bits" at a time. Even then, it may be hard to hide dat...

thanks for the support.i am a masters student who is doing thesis to work on the CELP algorithm specifically calculating the time,space complexities of the algorithm.so i jus need your help i.e if u can show me the site or forward the material where i can get the time the calculated time complexity of your Speex CELP algorithm and i can pick it from there.PLEASE Send instant messa...

(This is almost out of topic but anyway...) It is surprising how little research effort have been put into psy-acou models for CELP. The basic problem lies in that it is not easy to alter the LP model without distroying the minimum-phase property (ie. the stability of the predictor). That leaves us with psy-acou modelling of the noise-part only. However, my own research is in constrained LP-models that addresses just this probl...

Hello, Jean-Marc Valin schrieb: >>I am planning on creating a steganographic extension for speex/CELP. >>Since speex/CELP is lossy, there should be quite many bits that one >>can use for hiding data. > > Quite the opposite. Speex uses very few bits, so every bit you corrupt > is likely to be heard. You would need to use "fractions of bits" at a > time. Even then,...

Hi, Does anyone have an idea about the possibility to apply psychoacoustic models as the ones in mp3 or AAC to a CELP coder? Thanks! /Pontus <p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'speex-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject...