GSM EFR Vs GSM AMR

Started by Anonymous in Speech Coding19 years ago

Nice to have found an interesting site to discuss speech coding stuff. On the first look it looks like GSM AMR and GSM EFR...

Nice to have found an interesting site to discuss speech coding stuff. On the first look it looks like GSM AMR and GSM EFR have lot of commonolity. Standard says GSM AMR at rate 12.2k behaves exactly like GSM EFR. So it looks like GSM EFR is subset of GSM AMR. Can


Similarity of GSM-FR /HR with GSM-AMR

Started by biswasbiswajit in Speech Coding16 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


MS GSM 6.10 - Specification

Started by paulzazzarino in Speech Coding14 years ago 1 reply

I am trying t0 measure the amplitude from an MS-GSM 6.10 data stream. While 3GPP has specs on various GSM codecs, I am trying to wade thru ...

I am trying t0 measure the amplitude from an MS-GSM 6.10 data stream. While 3GPP has specs on various GSM codecs, I am trying to wade thru and determine what or where I can find a description of the bits. For example is MS GSM 6.10 FR? etc any help is appreciated!


GSM Full Rate DTX test vectors

Started by achaupit in Speech Coding15 years ago

Dear all, I am currently working on the GSM FR speech encoder for my student final year and I am experiencing some problem with...

Dear all, I am currently working on the GSM FR speech encoder for my student final year and I am experiencing some problem with the ETSI GSM FR DTX test vectors: Even when I use the implementation described by GSM 06.32 (section A.2.1) for LAR and xmax averaging, the FR DTX


implementation FR GSM vocoder with MATLAB

Started by redundancy2000 in Speech Coding17 years ago

Hi friends, I'm implementing the FR GSM vocoder with MATLAB software. However, i'm not able to correctly decode what has been...

Hi friends, I'm implementing the FR GSM vocoder with MATLAB software. However, i'm not able to correctly decode what has been coded via encoder. Please let me know if anybody has implemented GSM 06.10 with MATLAB. Regards Javad


difference between the CDMA and GSM and ITU-T Vocoders

Started by Lingadevaru in Speech Coding16 years ago

Hi all, If any one knows the difference b/n CDMA, GSM and ITU-T vocoders, please give your valuable inputs. Why can't we use GSM...

Hi all, If any one knows the difference b/n CDMA, GSM and ITU-T vocoders, please give your valuable inputs. Why can't we use GSM vocoders itself in CDMA and vise versa? Is there anything specific reason for to use the particular vocoders in praticular network? All speech


Filtering for input signals to the GSM EFR coder

Started by Sara Grassi in Speech Coding19 years ago

Hello, I am doing some work in Speaker Recognition on GSM coded speech. Currently, I am doing experiments with the GSM EFR coder. ...

Hello, I am doing some work in Speaker Recognition on GSM coded speech. Currently, I am doing experiments with the GSM EFR coder. My speech database is sampled at 16 kHz. So, to obtain signal sampled at 8 kHz to be fed into the coder, I have so far down-sampled using a 158th-or


GSM-FR CODEC

Started by amit...@vnl.in in Speech Coding11 years ago 1 reply

Hello I need GSM-FR codec (encoder and decoder) exe or source code for windows host machine, can anyone suggest where can i find it.

Hello I need GSM-FR codec (encoder and decoder) exe or source code for windows host machine, can anyone suggest where can i find it.


why different standards for GSM FR

Started by skakkeri2002 in Speech Coding16 years ago

Hi All Can any body give reasons (apart from homing sequence)for having different ETSI standards such as Phase2, phase 2plus, 3GPP...

Hi All Can any body give reasons (apart from homing sequence)for having different ETSI standards such as Phase2, phase 2plus, 3GPP for same GSM FR. The implementation standards and test vectors all seem to be same. Thanks in advance K.S.


GSM algorithm

Started by ben_psxtreme in Speech Coding15 years ago 9 replies

Hi everybody ! I am a student achieving an internship in a mobile network company. They have asked me to realize a GSM...

Hi everybody ! I am a student achieving an internship in a mobile network company. They have asked me to realize a GSM compression software. The best solution, looking at the hard piece of knowledge required to do everything from scratch, was to find a free code source on the


GSM HR Codec specifications

Started by Harsha in Speech Coding18 years ago

Hi All, Please let me know the latest version of GSM HR codec specifications. Also, the link to download them. Thanks, ...

Hi All, Please let me know the latest version of GSM HR codec specifications. Also, the link to download them. Thanks, Harsha


Source Code GSM--FR Codec

Started by Artham Sridhar in Speech Coding9 years ago 4 replies

Hi All I am not able to find GSM-FR speech codec ansi c code. If any body knows where can I get, please reply to me. I have already...

Hi All I am not able to find GSM-FR speech codec ansi c code. If any body knows where can I get, please reply to me. I have already searched in 3gpp standard search. But not able to find. Thanks in Advance. Regards Sridhar Artham


GSM 06.71

Started by Sarat Chandra, Kalyanam in Speech Coding16 years ago 1 reply

hi guys, If anyone has the following ETSI document plz send it to me,,, (that will be great help!!) GSM 06.71: "Digital...

hi guys, If anyone has the following ETSI document plz send it to me,,, (that will be great help!!) GSM 06.71: "Digital cellular telecommunications system (Phase 2+); Adaptive Multi-Rate speech processing functions; General description". tha


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


GSM FR test sequence

Started by skakkeri2002 in Speech Coding17 years ago

Hi, We are working on GSM-FR codec. When we feed any one of the following test inputs to the decoder, the output is not...

Hi, We are working on GSM-FR codec. When we feed any one of the following test inputs to the decoder, the output is not matching with the reference output provided by the ETSI. The input sequences, which are resulting in the wrong outputs, are: Seq01_u.cod, Seq02_


mean of the innovation energy in GSM-EFR

Started by Anonymous in Speech Coding19 years ago 1 reply

Dear all, In GSM-EFR, the mean of the innovation energy is needed for the quantization of the fixed codebook gain. The...

Dear all, In GSM-EFR, the mean of the innovation energy is needed for the quantization of the fixed codebook gain. The standard mentions that this energy is 36 dB. Could somebody tell me how this value was computed ? Thanks in advance, Giusy


a doubt on half rate gsm implementation aspects.

Started by Zij Nam in Speech Coding18 years ago

Hi yahoos, I am now using ansi c source for 1/2 rate gsm for a software driven voice applicaton . is it neccesary to use DTX,...

Hi yahoos, I am now using ansi c source for 1/2 rate gsm for a software driven voice applicaton . is it neccesary to use DTX, VAD in the minimum implementation .I ask this because the speech output I get is disturbed by clicking sounds and breaksand noise esp


GSM half rate coder

Started by b_v_harsha in Speech Coding17 years ago 5 replies

Hello all, I am on the lookout for a low bitrate speech coder which works at 2 - 8 kbps and has a good quality. also i am on...

Hello all, I am on the lookout for a low bitrate speech coder which works at 2 - 8 kbps and has a good quality. also i am on the look out for the code for the GSM half rate speech coder. Can any one of u plz help me out in my search. Thanks in advance,


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


GSM or CDMA//QCelp code in Matlab

Started by Chipo Masawi in Speech Coding16 years ago

Hey anyone! Is there any GSM or CDMA//QCelp code in Matlab? Chifa98 ===== You may be disappointed if you fail BUT you...

Hey anyone! Is there any GSM or CDMA//QCelp code in Matlab? Chifa98 ===== You may be disappointed if you fail BUT you are doomed if you dont try!!!!! Till next time Chipo