search for: vocoders

Hi everyone, I?m a graduate student in a Brazilian Intitute of Technology, and I?m doing some academic research regarding secure voice transmission over phone lines. One of our reserach goals is to implement a hardware vocoder, with low bit rates, and a preferably free algorithm, to be used in this secure voice system. Actually, there is a functional system using a proprietary AMBE

Hello, I'm interested in a low rate vocoder to run on SA-1110 or XScale processor (for PDAs voice application). Is there a suitable speex vocoder for that? Thanks in advance, Eyal. ________________________________________________ Get your own "800" number Voicemail, fax, email, and a lot more http://www.ureach.com/reg/tag --- >8 ---- List archives:

Hi, My name is Jean Quirion and I am a DSP engineer. Currently I am working on a project where it is desired to implement a VoIP solution over a GSM GPRS link. I would like to use Speex as the vocoder for this application. This application would require the Speex encoder/decoder and possibly the pre-processor to run on a low power fixed-point DSP such as a TI C55x. Thus, I am interested in

You're asking the wrong question. The question is not "why does it would bad with Speex?", but "why does it sound good with LPC10 and MELP?". And the answer is that both are vocoders. Try dropping frames/subframes with anything else (Vorbis, MP3, G.729, u-law, ...) and it'll sound terrible as well. The only reason it sounds good with vocoders is because the codec parameters are in fact synthesizer parameters that don't have a direct connection with the signal....

...ts of float stuff there. Jean-Marc Le mercredi 20 juillet 2005 ? 09:18 -0700, gue baja a ?crit : > Is there any place where I can see a summary of what > is being done and what is still pending with the fixed > point version of the libraries? > > I have some experience with vocoders and fairly good > experience with de-jitters and suchs. I may be able to > help. > > Thanks > > Baja > _______________________________________________ > Speex-dev mailing list > Speex-dev@xiph.org > http://lists.xiph.org/mailman/listinfo/speex-dev > -- Jean-Marc Val...

Hi students (non-students may skip this)! As some of you may be aware, the deadline for the Google Summer of Code (http://code.google.com/soc/) program is approaching quickly (March 24th). For those interested, there are two Speex-related projects (below) and lots more in Xiph.Org in general (see http://wiki.xiph.org/index.php/Summer_of_Code). You can apply at

-This is my 'sip.conf' file: ;************************************************************* ; ; SIP Configuration for Asterisk ; [general] port = 5060 ; Port to bind to bindaddr = 0.0.0.0 ; Address to bind to context = default ; Default for incoming calls tos=184 maxexpirey=3600 ; Max length of incoming registration we allow

for the bits init I am using speex_bits_set_bit_buffer and I don't use the write to or read from because the data is already in the buffer I am reading from and I am writing to the final buffer so I don't need to move arrays around. what part is the vocoder part of the decode? Thanks for your help! -Mike >>> Jean-Marc Valin <jean-marc.valin@usherbrooke.ca> 08/06/07

Jim, Thank you very much for your suggestions. I 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

I was wondering if the developers were using anything to "objectively" test the quality of the speex vocoder. For instance PSQM or one of the many derivatives. Mean Opinion Scoring seems an expensive route. Is there some open source software to use for this? <p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To

Is there any place where I can see a summary of what is being done and what is still pending with the fixed point version of the libraries? I have some experience with vocoders and fairly good experience with de-jitters and suchs. I may be able to help. Thanks Baja

There is a port for the TI C55X, in the TI directory of the source tree. This builds and runs directly on the TI C55x simulator (Code Composer). I have run this on the Spectrum Digital C5509A EVMPLUS board, by modifying some of the sample audio drivers (I could provide some details if you chose that board). You can certainly get started in the simulator. The Speex port does not include any

I was also wondering if there is a standard set of input sequences people are using to test Speex. I haven't stumbled upon it/them yet. > -----Original Message----- > From: owner-speex-dev@xiph.org [mailto:owner-speex-dev@xiph.org]On > Behalf Of Jean-Marc Valin > Sent: Tuesday, February 25, 2003 7:24 PM > To: speex > Subject: Re: [speex-dev] Quality > > > > I

-----Original Message----- From: Jean-Marc Valin [mailto:jean-marc.valin@usherbrooke.ca] Sent: Thursday, June 14, 2007 11:17 PM To: Michael Shatz Cc: speex-dev@xiph.org Subject: Re: [Speex-dev] Blackfin inline assembler and VisualDSP++ toolchain Michael Shatz a ?crit : >>> Actually, you're the first I know using the VisualDSP++ toolchain >>> :-) >> >> I guess

I've noticed that the nb decoder uses floating point in several places even when using FIXED_POINT. I don't have to deal with lost packets, so I'm mainly interested in innov_gain and pgain in no transmission mode (nb_celp.c around line 1272) and g and exci in vocoder mode (around line 1557). Is there a reason that these places must use floating point, or would it be possible to

...an-Marc > > Le mercredi 20 juillet 2005 ? 09:18 -0700, gue baja a ?crit : > > Is there any place where I can see a summary of what > > is being done and what is still pending with the fixed > > point version of the libraries? > > > > I have some experience with vocoders and fairly good > > experience with de-jitters and suchs. I may be able to > > help. > > > > Thanks > > > > Baja > > _______________________________________________ > > Speex-dev mailing list > > Speex-dev@xiph.org > > http://lists.xiph.o...

I just got a grandstream SIP phone Here is my sip.conf for the phone [mlh] type=friend insecure=yes username=mlh secret=mlh host=dynamic canreinvite=no The phone as the default config on it. If I use the phone to call a Zap interface (a tdm card) the voice sounds all choppy. If I use the phone to call a x100p card, it does not dial what I dial (no DTMF) I don't know

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

...playback. Bill 2010/10/19 Jean-Marc Valin <Jean-Marc.Valin at usherbrooke.ca>: > You're asking the wrong question. The question is not "why does it would bad > with Speex?", but "why does it sound good with LPC10 and MELP?". And the > answer is that both are vocoders. Try dropping frames/subframes with > anything else (Vorbis, MP3, G.729, u-law, ...) and it'll sound terrible as > well. The only reason it sounds good with vocoders is because the codec > parameters are in fact synthesizer parameters that don't have a direct > connection with t...

I'm trying to get ChansSpy to work. It works, in the pass/fail sense, but it is difficult to understand the various speakers. I can hear users on our end just fine, but the other end sounds like their going through a vocoder, if I can understand them at all. Otherwise it is just garbled. We are using the following setup: all of our phones are SIP phones; for our outgoing calls we make use of a