G.721vsG.729 | Speech Coding

Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)

Hi guys, I am doing a project, comparing ADPCM & CELP. For this i have chosen G.721 for ADPCM & G.729 standard for CELP. In these, 1)What are the parameters that can be compared in these 2? 2)How can the Mean squared error be found out? 3)Are the MOS scores standard for the results,irrespective of the platform or input file? 4)Is it necessary to implemnt these on UNIX or SUN Ultra Sparc station or can it be implemented in MATLAB,if Yes, how? 6)In the G.729 code files,there is a .spd file,what is the way to play & listen to it? I tried it with Sound command in MATLAB,but the quality was very poor...only for Fs=4600-4800 with 16bits is the audibilty OK. That is a long list of queries:-), i'll be grateful for the response, Sincerely, Prateek.Shrivastava

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Hi Prateek: (1) You could compare delay, MIPS, memory needs, code size, transparency to non-voice signals (signalling, FAX, TDD, alarm systems, music), tolerance to channel errors, tandeming with other codecs, input level sensitivity, background noise sensitivity, comfort noise generation and MOS. (2) I'm not sure what MSE you mean. Perhaps MSE of the MOS scores? (3) MOS scores are platform independent but do vary a little with input file as a function of male versus female, language, etc. (4) I do not know of Matlab G.729 code. Chuck Hutton In a message dated 3/23/2003 5:01:13 PM Eastern Standard Time, writes: > > Hi guys, > I am doing a project, comparing ADPCM & CELP. > For this i have chosen G.721 for ADPCM & G.729 standard for CELP. > In these, > 1)What are the parameters that can be compared in these 2? > 2)How can the Mean squared error be found out? > 3)Are the MOS scores standard for the results,irrespective of the > platform or input file? > 4)Is it necessary to implemnt these on UNIX or SUN Ultra Sparc > station or can it be implemented in MATLAB,if Yes, how? > 6)In the G.729 code files,there is a .spd file,what is the way to > play & listen to it? > I tried it with Sound command in MATLAB,but the quality was very > poor...only for Fs=4600-4800 with 16bits is the audibilty OK. > > That is a long list of queries:-), i'll be grateful for the response, > > Sincerely, > Prateek.Shrivastava

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Discussion Groups | Speech Coding | G.721vsG.729

G.721vsG.729 - Prateek Shrivastava - Mar 23 22:01:00 2003

Re: G.721vsG.729 - Author Unknown - Mar 24 18:59:00 2003