Does anyone have any link or results of speech quality comparison between IMBE vocoder (or AMBE) and MELPe / MELP vocoder at rates 2400, 1200, 600 bps? I heard MELPe vocoder sounds much better, is that true? What about other aspects such as robustness to background noise & channel errors? Claudia R.
MELP / MELPe vocoder and IMBE vocoder
Started by ●February 3, 2006
Reply by ●February 3, 20062006-02-03
CR wrote:> Does anyone have any link or results of speech quality comparison > between IMBE vocoder (or AMBE) and MELPe / MELP vocoder at rates 2400, > 1200, 600 bps?You can see it for yourself. MELP samples are here: http://www.signalogic.com/ MBE samples are here: http://www.spiritdsp.com http://www.dvsinc.com> I heard MELPe vocoder sounds much better, is that true?Yes. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
Reply by ●February 3, 20062006-02-03
What's the difference between MELP and MELPe ? As far as I know, MELP algorithm is described in some original articles, books on speech coding, US patents and there is even some reference C code available from some web site. Where is MELPe algorithm described ? (other than in Compandent's marketing brochures)
Reply by ●February 3, 20062006-02-03
fizteh89 wrote: BTW, did you graduate MiPh&T?> What's the difference between MELP and MELPe ?MELPe is brand name for MELP below 2400 bps. The main difference from the original MELP is in the advanced VQ of the parameters.> As far as I know, MELP algorithm is described in some original > articles, books on speech coding, US patents and there is even some > reference C code available from some web site. > > Where is MELPe algorithm described ? (other than in Compandent's > marketing brochures)MELPe 1200/2400 is adopted as a federal standard MIL-STD-3005. The documentation should be available. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
Reply by ●February 3, 20062006-02-03
>BTW, did you graduate MiPh&T?Yep, FOPF back in 1989. Did you ?>MELPe 1200/2400 is adopted as a federal standard MIL-STD-3005. The >documentation should be available.Where ? IPR-wise, what additional US patents are included in MELPe standard (if you happen to know) ?
Reply by ●February 3, 20062006-02-03
fizteh89 wrote:>>BTW, did you graduate MiPh&T? > > > Yep, FOPF back in 1989. > > Did you ?Sure. FRTK, then postgrad. 1998. What is your name?> >>MELPe 1200/2400 is adopted as a federal standard MIL-STD-3005. The >>documentation should be available. > > > Where ?http://store.mil-standards.com> IPR-wise, what additional US patents are included in MELPe standard (if > you happen to know) ?Can't help you with that. VLV
Reply by ●February 3, 20062006-02-03
MELPe demo samples in all kind of conditions (clean, noisy, various frame-erasure-rate FER) and at all rates are available at Compandent, (which seems to be a very professional and comprehensive MELPe suite): http://www.melpe.com http://www.compandent.com/products_melpe.htm MELP? I guess it is obsolete now that MELPe is around. See also the MELP and MELPe FAQ: http://www.compandent.com/melpe_faq.htm and their customer review is very impressive: http://www.compandent.com/products_melpe.htm#CustRev> CR wrote: > >> Does anyone have any link or results of speech quality comparison >> between IMBE vocoder (or AMBE) and MELPe / MELP vocoder at rates 2400, >> 1200, 600 bps? >
Reply by ●February 3, 20062006-02-03
Look at Compandent's FAQ: http://www.compandent.com/melpe_faq.htm fizteh89 wrote:> What's the difference between MELP and MELPe ? > > As far as I know, MELP algorithm is described in some original > articles, books on speech coding, US patents and there is even some > reference C code available from some web site. > > Where is MELPe algorithm described ? (other than in Compandent's > marketing brochures) >
Reply by ●February 3, 20062006-02-03
fizteh89 wrote:> IPR-wise, what additional US patents are included in MELPe standard (if > you happen to know) ?MELPe IPR is held by: TI, Microsoft, Compandent, AT&T/Lucent (Noise PreProcessor), Thales (600bps)
Reply by ●February 4, 20062006-02-04
>> What's the difference between MELP and MELPe ? > > MELPe is brand name for MELP below 2400 bps. The main difference from > the original MELP is in the advanced VQ of the parameters.That's totally incorrect! "brand-name" for DoD & NATO standard? Where did you get that from? I just can't believe what people can possibly make up when they can't just admit they simply don't know???? MELPe stands for ENHANCED-MELP, in which the following enhancements were added: 1. The analysis & parameter extraction was improved 2. The encoding was improved (including VQ and other stuff) 3. The synthesis was improved 4. Noise-Preprocessor was added 5. It operates in 3 different rates (i.e. 600, 1200 & 2400 bps) 6. It also includes transcoding between the rates, The 2400 bps MELPe's bit format matches that of the old & obsolete MELP, hence it can be added to an existing MELP based network and improve the quality on both ends!>> As far as I know, MELP algorithm is described in some original >> articles, books on speech coding, US patents and there is even some >> reference C code available from some web site. >> >> Where is MELPe algorithm described ? (other than in Compandent's >> marketing brochures) > > MELPe 1200/2400 is adopted as a federal standard MIL-STD-3005. The > documentation should be available.It was also adopted an NATO standard. And again, not only 1200/2400 bps but also 600 bps rate MELPe exists. All this you could read too at Compandent's web site: http://www.MELPe.com and the FAQ: http://www.compandent.com/melpe_faq.htm
