transmitting phase spectrum in MELP?

Started by Ilya Druker in Speech Coding14 years ago 2 replies

Ladies & Gentlemen I encountered the problem of transmission of music by MELP codec. MELP is intended for coding human speech, so it is...

Ladies & Gentlemen I encountered the problem of transmission of music by MELP codec. MELP is intended for coding human speech, so it is not surprising that the quality of the music synthesized by MELP is very low. One of the problems is failure of the pitch detector to recognize pitch-doubling/tripling in music. I think that transmission of phase


1.2Kbps version of MELP Speech Coder..?

Started by Khubaib in Speech Coding15 years ago 2 replies

Hi! I want to know about the 1.2Kbps MELP Speech Coder. Actually, 2.4Kbps MELP is available. But, i want to know about the 1.2KBps...

Hi! I want to know about the 1.2Kbps MELP Speech Coder. Actually, 2.4Kbps MELP is available. But, i want to know about the 1.2KBps version. There is a paper available online which explains a little about ongoing research about 1.2Kbps MELP. Is there a speech coding standard at


melp synthesis silence output

Started by steh...@hotmail.com in Speech Coding12 years ago 3 replies

Hi, I am using a codec with sampling frequency of 32KHz, I am decimating the input to get 8KHz frequency. These samples are then fed into the...

Hi, I am using a codec with sampling frequency of 32KHz, I am decimating the input to get 8KHz frequency. These samples are then fed into the MELP Analysis. The ouput of melp analysis is transmitted through a modem to the remote side. Here MELP Synthesis is called, and the speech is played by codec. I have 2 questions here, 1. As the data is being transmitted to remote side, there can be some ...


Re: MELP Algorithm IP

Started by 1010...@163.com in Speech Coding12 years ago

> > > > Phil- > > > I tracked this down a few years ago.... > > > > The MELP patents were sold to ASPI, which was...

> > > > Phil- > > > I tracked this down a few years ago.... > > > > The MELP patents were sold to ASPI, which was purchased by Polycom. You must > > contact them to get licensing information. http://www.aspi.com > > This is incorrect; Polycom has nothing to do with MELP. Read this carefully: > > http://www.aspi.com/tech/ > > The correct info is as fol


Test Vectors for MELP Vocoder...

Started by Khubaib in Speech Coding14 years ago 1 reply

Dear members! I need different test vectors (preferably standard test vectors) for testing MELP 2400bps voice coding...

Dear members! I need different test vectors (preferably standard test vectors) for testing MELP 2400bps voice coding standard. I am in the process of implementing MELP 2400 vocoder on different platforms and i need test vectors to test for thier validity. Are


Download source code of MELP coders

Started by m_dj...@yahoo.com in Speech Coding13 years ago 1 reply

Hi I want download a standard MELP coder (2400 bps). Can you show me where I can do that. thanks

Hi I want download a standard MELP coder (2400 bps). Can you show me where I can do that. thanks


Information About MELP

Started by gw8912 in Speech Coding17 years ago

Hi...all Does anyone research this kind of codec? I can't understand the part of multi-quantization Can any one have standard or...

Hi...all Does anyone research this kind of codec? I can't understand the part of multi-quantization Can any one have standard or reports of the MELP? Thank you very much...


CELP/MELP

Started by anona_ahmed in Speech Coding14 years ago 1 reply

hi all: i have a speech file 8KHZ and 16bit/ sample, 128kbps. what's the convenient CELP algorithm for this bit rate for the best ...

hi all: i have a speech file 8KHZ and 16bit/ sample, 128kbps. what's the convenient CELP algorithm for this bit rate for the best quality. where can i find the souce code or the application and also for the MELP algorithm. Thanks, Ann


MELP Algorithm IP

Started by plsymonds in Speech Coding14 years ago 3 replies

Hi All, I am busy looking into the MELP algorithm and as Texas Instruments has intellectual property rights on the...

Hi All, I am busy looking into the MELP algorithm and as Texas Instruments has intellectual property rights on the algorithm I am interested in finding out more about the legal issues (such as copyright, royalties etc. etc.) pertaining to the use of the


Re: [Fwd: ask help]

Started by Jeff Brower in Speech Coding15 years ago 2 replies

Sara Lyme- > i like to know what is the characteristic of the input signal that > i will used in melp program (format...

Sara Lyme- > i like to know what is the characteristic of the input signal that > i will used in melp program (format ,frequency ,bit,mono )and i > know that melp work well for male speakers than female speakers please could you > explaint why. > ple


test sequences for MELP

Started by Eli Britstein in Speech Coding16 years ago

Hi all, Is there a standard of test sequences for the MELP vocoder ? If so, where could I find them ? Thanks, Eli. ...

Hi all, Is there a standard of test sequences for the MELP vocoder ? If so, where could I find them ? Thanks, Eli.


1200 Bit/Sec MELP

Started by shahram heidari in Speech Coding13 years ago

Dear All, I am looking for MELP 1200 Bit/Sec Fixed Point C and/or TI, Motorola, ADI source code to purchase in order to applay in Fleet...

Dear All, I am looking for MELP 1200 Bit/Sec Fixed Point C and/or TI, Motorola, ADI source code to purchase in order to applay in Fleet Managment project. Any help in this regard is appricated. BR, Shahram


MELP coder TMS320C6711 DSP

Started by Anonymous in Speech Coding18 years ago

Hello I'm interested in details for the MELP coder algorithm. I'd like to know if anyone has implemented this coder in real...

Hello I'm interested in details for the MELP coder algorithm. I'd like to know if anyone has implemented this coder in real time, especially on the TI DSP?. Regards


;( help me. (MELP) ( multi stage vector quantization)

Started by mojtaba mahdavi in Speech Coding16 years ago 5 replies

Hi dear all. I am doing a project on MELP. Now I want to undrestand Multi Stage Vector quantization. But I cant find a...

Hi dear all. I am doing a project on MELP. Now I want to undrestand Multi Stage Vector quantization. But I cant find a good text on it. Does any body know any resource for it. Any response is appriciated. yours sincerely.


MELP: peakiness thresholds

Started by Ilya Druker in Speech Coding14 years ago

Ladies & Gentlemen The additional criterion for voicing measure in MELP is peakiness. For r=1.4 the voicing in the first band is set 1...

Ladies & Gentlemen The additional criterion for voicing measure in MELP is peakiness. For r=1.4 the voicing in the first band is set 1 (strong voicing), for r=1.6 the voicing at second and third bands also set to 1. According to the classical paper "Selective Modeling of the LPC residual during unvoiced frames: White noise or pulse e


MELP 2400 bps to 1200 bps

Started by Anonymous in Speech Coding17 years ago

Pls could anyone let me know how i could convertthe standard MELP 2400 bps to 1200 bps? Thanks! saman kamal

Pls could anyone let me know how i could convertthe standard MELP 2400 bps to 1200 bps? Thanks! saman kamal


Need info about the MELP bitstream format..?

Started by Khubaib in Speech Coding15 years ago 2 replies

Dear membes I need to know the bitstream format of the MELP's 54 bit frame.?. I know what are the different bits (the number of...

Dear membes I need to know the bitstream format of the MELP's 54 bit frame.?. I know what are the different bits (the number of bits for different parameters) in the bitstream, e.g. this is the 54 bit format Pitch index 7 Jitter flag 1 Bandpass voicing decision 4x1


Test vectors for MELP and G.723 vocoders

Started by Khubaib in Speech Coding14 years ago

Dear all ! I want to have any standard or GOOD test vectors for voice coders like MELP and G.723.1. Where can i find them.?....

Dear all ! I want to have any standard or GOOD test vectors for voice coders like MELP and G.723.1. Where can i find them.?. Is there a way for noise analysis of these voice coders.?> E.g . what would be the vocoder response to noise corrupting encoded bits.? R


reading the MELP bitstream

Started by eric...@yahoo.com in Speech Coding11 years ago 3 replies

Good day! I'm supposed to do some experiments on this particular wideband speech coder that we're developing at our laboratory. I'm supposed...

Good day! I'm supposed to do some experiments on this particular wideband speech coder that we're developing at our laboratory. I'm supposed to verify this certain paper dealing with the exploitation of residual redundancies of a particular source coder's bitstream. I'd like to verify the paper first by using it on standard MELP and comparing my results with the results on the paper. However...


about fractional pitch search of melp

Started by tms3...@yahoo.com.cn in Speech Coding10 years ago

hi all I'm learning MELP source code.I am not able to understand the fractional pitch search algorithm in function Shortword...

hi all I'm learning MELP source code.I am not able to understand the fractional pitch search algorithm in function Shortword frac_pch(Shortword sig_in[],Shortword *pcorr,Shortword fpitch, Shortword range,Shortword pmin,Shortword pmax, Shortword pmin_q7,Shortword pmax_q7,Shortword lmin); somebody can give me some hints about determining fractional pitch in Bandpass voicing analy...