I'm just starting to get involved in speech processing/coding, and I'm trying to find low-bitrate patent-free codecs, around...

I'm just starting to get involved in speech processing/coding, and I'm trying to find low-bitrate patent-free codecs, around 4.8kbit and below. I haven't been able to find any solid info on patent issues with some of the obvious codecs (eg. CELP). For example, CELP is standar

Dear All, I have some difficulties in understanding CELP coding process, one of them is about Mean-removed LSF vector and...

Dear All, I have some difficulties in understanding CELP coding process, one of them is about Mean-removed LSF vector and quantization of LSF coefficient (ETSI 06.09). For 7.95 kbps mode, the residual LSF is quantified using split vector quantization (SVQ). The re

im new to speech coding. Currently im trying to calculate speech recognition accuracy for TIMIT corpus which is coded using GSM and CELP...

im new to speech coding. Currently im trying to calculate speech recognition accuracy for TIMIT corpus which is coded using GSM and CELP 4.8kbps coder. im using HTK toolkit. i find out the my speech recognition accuracy drop drastically when i tested coded speech using the acoustic model trained using NIST (wav) file from TIMIT corpus.below i list down my method and can someone of you ...

Dear All, First of all, I want to introduce myself. My name is Adang Sudrajat. I have a final project about implementation of...

Dear All, First of all, I want to introduce myself. My name is Adang Sudrajat. I have a final project about implementation of QCELP. Would anyone help me to answer some questions such as: 1. What makes QCELP is different from other CELP methods? 2. How to implemen

Hey I'm working on a CELP AMR codec. The coder uses previous samples of the input speech, for windowing or creating the past...

Hey I'm working on a CELP AMR codec. The coder uses previous samples of the input speech, for windowing or creating the past excitation. So, my question is: what happened for the first frame ? Thank you, Phil.

Free is better. But I only found float piont free source. Thank you.

Free is better. But I only found float piont free source. Thank you.

hi , Presently i am doing a project "Development of Generic Architecture for CELP algorithms" My questions??? ...

hi , Presently i am doing a project "Development of Generic Architecture for CELP algorithms" My questions??? ------------- why most of the speech coding algorithms are implemented in programmble DSP ??? i came to know that ADPCM harware impl

HI I am doing CELP coding in Matlab.I have done the implementation till evaluation of LPC coefficients.Now I need to convert them...

HI I am doing CELP coding in Matlab.I have done the implementation till evaluation of LPC coefficients.Now I need to convert them to LSP. If somebody could help me with the coding or give me some tips of how to go about it,I would be really thankful. eagerly waiting for your ma

Hi all, I am intend to learn much about variable rate speech coding, and I take QCELP (Qualcomm CELP) to study.I am looking...

Hi all, I am intend to learn much about variable rate speech coding, and I take QCELP (Qualcomm CELP) to study.I am looking for any good reference that have complete describe about the concept and algorithm of this vocoder. Especially I need the source code

Hello all, I tried for long time to implement the CELP "FS1016" on TMS320C6711, I tried for mmore than 3 weeks but I failed!!!,...

Hello all, I tried for long time to implement the CELP "FS1016" on TMS320C6711, I tried for mmore than 3 weeks but I failed!!!, then I tried to use MELP which use less computations, but till now no way "more than 2 weeks", can u tell me an algorithm that has bit r

Hi , I just finished implemeting G726. I found that the quality is very low. Can some one give me sugesstion about improving...

Hi , I just finished implemeting G726. I found that the quality is very low. Can some one give me sugesstion about improving the quality of G.726. I was told that using some of the modules from CELP will improve the quality. But others disagree saying it will not improve

In a CELP coder given a set of LPC coeff, without any other initial conditions How can we generate (s[n]-r[n]), using zero...

In a CELP coder given a set of LPC coeff, without any other initial conditions How can we generate (s[n]-r[n]), using zero excitation. (or how to extract information only from LPC coeff ) where, s[n]- original speech signal & r[n]- residual signal. Eagerly waiting for

Abhishek- > hi sir, > in my engineering curriculum i m working on project "implementation of > ld-celp(g.728) on the dsp processor...

Abhishek- > hi sir, > in my engineering curriculum i m working on project "implementation of > ld-celp(g.728) on the dsp processor tms320c6713".sir i m unable to do programming > and i m running out of time...........sir please help me and provide me it's whole > code.please Please post your question to the group, not to me. I've copied the speechcoding group for you on this rep

Hi all, I need help in estimating the positions and pulses of algebraic codebook it is said in the standards (etsi 05.90) : ...

Hi all, I need help in estimating the positions and pulses of algebraic codebook it is said in the standards (etsi 05.90) : "First, for each of the five tracks the pulse positions with maximum absolute values b(n) are searched.From global maximum value for all the pulse p

Hi, G723 & G729 are CELP based codecs, but G726 is ADPCM based codec. The basic difference is the method for coding used, Data rate...

Hi, G723 & G729 are CELP based codecs, but G726 is ADPCM based codec. The basic difference is the method for coding used, Data rate supported and application for which it has to be used depending on the quality of the output. Let me know if u need the technical differences. Hope this is useful With Rgds Che

dear All, I have some difficulties in understanding windowed sinc interpolation using FIR filter in adaptive codebook search...

dear All, I have some difficulties in understanding windowed sinc interpolation using FIR filter in adaptive codebook search process of CELP...(g729) anyone have some reference? thx a lot regards, arida

Hi, All the reasonings given for 10th order LPC is plausible. But i encountered 50th order filter in G.728(LD-CELP). what...

Hi, All the reasonings given for 10th order LPC is plausible. But i encountered 50th order filter in G.728(LD-CELP). what could be the probable reason for having such a high order (computationally intensive) LPC in this codec. Note: The codec is a backward a

Hi, I am looking for speech coding algorithm, like ADPCM, ASPCM, CELP which can be applied most popular 8-bit controller...

Hi, I am looking for speech coding algorithm, like ADPCM, ASPCM, CELP which can be applied most popular 8-bit controller without any patents and which are open. Can anyone suggest? Regards Ken

hi, I read that the "analysed" filter is a FIR (stability is ensure) but the synthesized filter is a IIR filter...

hi, I read that the "analysed" filter is a FIR (stability is ensure) but the synthesized filter is a IIR filter (inverse filter). is that right? I don't see how it is so? and if it is so, how is stability ensured? rgds, tk

Hi Great to have a good follow-up on an interesting topic. It would be great if more who have good exposure to this topic, join...

Hi Great to have a good follow-up on an interesting topic. It would be great if more who have good exposure to this topic, join in. >All the reasonings given for 10th order LPC is plausible. But i >encountered >50th order filter >in G.728(LD-CELP