AMR LSP quantization

Started by subrata chatterjee in Speech Coding17 years ago 1 reply

hi all, Anybody experienced in AMR speech coding can please tell something about LSP quantization. Actually i have tried to...

hi all, Anybody experienced in AMR speech coding can please tell something about LSP quantization. Actually i have tried to understand it from the standard but i think it's not sufficient. So, please tell me address of any site from where i can collect some informations and


AMR IF1 Streams

Started by simha j in Speech Coding16 years ago

Hi all, Can anyone in the group share the AMR IF1 test vectors? we badly need this for testing our modules. Thanks &...

Hi all, Can anyone in the group share the AMR IF1 test vectors? we badly need this for testing our modules. Thanks & regards Simha __________________________________


AMR codec

Started by Syed Moinuddin in Speech Coding16 years ago 1 reply

Hi, Where can I download FREE AMR codec. Is there any Wavelet Based Speech codec FREELY available Regards Syed Moinuddin...

Hi, Where can I download FREE AMR codec. Is there any Wavelet Based Speech codec FREELY available Regards Syed Moinuddin


AMR coding mode determinating

Started by in Speech Coding17 years ago 2 replies

hi all, I am wondering to know the procedure and which module that determinat the AMR coding mode (different bit rate)....

hi all, I am wondering to know the procedure and which module that determinat the AMR coding mode (different bit rate). Besides, please introduce some reference articles for me about this to read. Regards, lee


AMR SID frames

Started by urx in Speech Coding17 years ago

Hello, does anybody can tell me about AMR-NB SID frames why they are not fixed size composed by nokia cellphone? regards. ...

Hello, does anybody can tell me about AMR-NB SID frames why they are not fixed size composed by nokia cellphone? regards.


Re: AMR-NB codec

Started by Ashwin Chandrasekaran in Speech Coding11 years ago

Thanks Dejun. By the way, so if I pack the actual encoded bits on a per fra= me basis and save it as a .amr file, then would any player that...

Thanks Dejun. By the way, so if I pack the actual encoded bits on a per fra= me basis and save it as a .amr file, then would any player that plays 3GPP = format audio files be able to play them? I plan to try this out anyway, but= just wanted to know if the file would be recognized as a 3GPP content or i= s there some other processing that is done on this before it can be recogni= zed and pl...


look-ahead in AMR why?

Started by manoj garg in Speech Coding18 years ago 1 reply

Dear friends, > i am learning AMR-NB. In the specifications i found > that the look-ahead is used in all modes except 12.2k >...

Dear friends, > i am learning AMR-NB. In the specifications i found > that the look-ahead is used in all modes except 12.2k > mode. my doubts are: > 1- What is the adavantage of using 5 ms look-ahead > while there is no look-ahead in 12.2k mode. what is


AMR - UMTS coding

Started by Ben in Speech Coding15 years ago

Hello, I wanted to answer one of you who have written me in private, but the mail address was wrong, so I decided to write...

Hello, I wanted to answer one of you who have written me in private, but the mail address was wrong, so I decided to write to all of you. I was explained that the ETSI compression code for AMR was writing a 16 bits word to code one bit, but that a flag could be e


Few general queries on AMR

Started by subrata_etc in Speech Coding17 years ago 2 replies

hi friends, I have just started working with AMR speech codec. I would like post few general queries which are written below.......

hi friends, I have just started working with AMR speech codec. I would like post few general queries which are written below.... 1)What is the application of different bit rates(12.2,10.2,7.95,7.40,6.70,5.90,5.15,4.75 kbits/sec in practical field? 2)After usi


Thanks and AMR

Started by Ben in Speech Coding15 years ago

Thanks to all of you, I have been on www.etsi.org and www.3gpp.org, and found many interesting things. I have been told moreover...

Thanks to all of you, I have been on www.etsi.org and www.3gpp.org, and found many interesting things. I have been told moreover than the last evolution in speech coding for mobile networks was the UMTS AMR, and am now trying to implemant this piece of code. (It is working quite well,


Re: AMR-NB codec

Started by Ashwin Chandrasekaran in Speech Coding11 years ago 2 replies

Hi Rama, Sorry about the confusion. I actually meant the file at the output of the AMR-NB encoder alone (not the decoded output) . Anyway,...

Hi Rama, Sorry about the confusion. I actually meant the file at the output of the AMR-NB encoder alone (not the decoded output) . Anyway, thanks for taking time to answer my questions. Cheers, Ashwin ----- Original Message ---- From: Rama Krishna K To: ashwin_c29 Cc: s...@yahoogroups.com Sent: Monday, August 4, 2008 11:24:44 PM Subject: Re: [spee


DTMF detection on a GSM AMR bitstream

Started by e_voice61 in Speech Coding16 years ago 2 replies

Hi all, Do anyone know of a way to detect DTMF on a GSM AMR bitstream without fully decoding it? I will be happy to know if...

Hi all, Do anyone know of a way to detect DTMF on a GSM AMR bitstream without fully decoding it? I will be happy to know if you can do it on ITU-T voice codecs as well (G.723.1, G.728, G.729). Thanks


AMR-WB optimization

Started by Anonymous in Speech Coding15 years ago 4 replies

Hello everybody, I am working on the optimization of the AMR-WB speech codec code obtained from ITU-T on the c6211 dsk. I...

Hello everybody, I am working on the optimization of the AMR-WB speech codec code obtained from ITU-T on the c6211 dsk. I have done the optimization techniques suggested for TI's optimizing compiler like using intrinsics, loop trip counts, scratch-pad memory etc..BUt still haven't


Similarity of GSM-FR /HR with GSM-AMR

Started by biswasbiswajit in Speech Coding17 years ago

Hi All, I want to know if compatibility can be provided for GSM-AMR codec along with GSM-FR and GSM-HR codec. DO I have to...

Hi All, I want to know if compatibility can be provided for GSM-AMR codec along with GSM-FR and GSM-HR codec. DO I have to develop the HR and FR seperately? Where do I get the source code for GSM-FR? This is not available in 3GPP site. Regards Biswaji


EFR compatibale AMR.

Started by Anonymous in Speech Coding17 years ago

Hi All, How to convert exhisting AMR Speech codec, EFR compatible ? At least theoritical details will be of great help. ...

Hi All, How to convert exhisting AMR Speech codec, EFR compatible ? At least theoritical details will be of great help. Greetings Gopalkrishna Puranik. Infineon Technologies India Private Limited. Discoverer 10th Floor, ITPL. Whitefield Road, Ban


few fundamental questions on AMR speech coding

Started by subrata chatterjee in Speech Coding17 years ago

Hi friends, I have some fundamental queries regarding AMR speech codec. 1) Why we are using two windows in case of ...

Hi friends, I have some fundamental queries regarding AMR speech codec. 1) Why we are using two windows in case of 12.2kbit/sec mode? 2)What is the utility of using auto correlation after windowing? 3)What is the utility of using lag wind


AMR-NB Optimization

Started by venkat ramanan in Speech Coding15 years ago 2 replies

Hai everybody, Can anybody suggest me a method to optimize the ACELP search in AMR-NB codec?(DFTS method) so that there is no...

Hai everybody, Can anybody suggest me a method to optimize the ACELP search in AMR-NB codec?(DFTS method) so that there is no reduction in speech quality when compared to original? I have already gone through some IEEE papers. But speech quality is not maintained. They reduced the


Re: abt VAD algorithm 1 of AMR codec

Started by rock...@yahoo.com in Speech Coding13 years ago

hi sameer, do you still have the c-code for the vad you mentioned below. i'm working on it now and it would be quite helpful if you could help me...

hi sameer, do you still have the c-code for the vad you mentioned below. i'm working on it now and it would be quite helpful if you could help me out with it. looking forward to it. if anyother member has it.... plz forward it to me .. thank you, rakesh > > > > Hi all! > > i have a query regarding the VAD algorithm 1 used in GSM AMR speech codec.one of > the steps in thi


GSM AMR - EFR Test Vectors

Started by vipinpathak in Speech Coding18 years ago

Hi All; I want to know if there are additional Test Vectors for the GSM AMR and EFR codecs, apart from the ones provided by the...

Hi All; I want to know if there are additional Test Vectors for the GSM AMR and EFR codecs, apart from the ones provided by the ETSI and 3GPP. Thanks Vipin


regarding adaptive c/b in AMR encoder

Started by Sameer Kibey in Speech Coding16 years ago 1 reply

hi all in the AMR standard, a signal called y[n] is used. it is the "filtered adaptive codebook vector" and is defined as: ...

hi all in the AMR standard, a signal called y[n] is used. it is the "filtered adaptive codebook vector" and is defined as: y[n] = v[n]*h[n] (read convolution of v[n] and h[n]), where v[n] => adaptive codebook vector and h[n] => impulse response of teh wei