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


VAD on AMR frames

Started by nir....@gmail.com in Speech Coding10 years ago

hi all, I am implementing Voip App on nokia devices. I have API to AMR Decoding. I want to implement my own VAD. the reason is that it seems...

hi all, I am implementing Voip App on nokia devices. I have API to AMR Decoding. I want to implement my own VAD. the reason is that it seems that the AMR VAD doesn't give good performence. In my app, I need to close down delays from the channel and I want to know which frame to throw away. also, Its always nice to save some BW by sending less frames. so, what I have at the TX side is ...


VAD Decision from G.729B and AMR code

Started by tparis23 in Speech Coding8 years ago

Hello, I am implementing several standard VADs as a reference for my work in my internship on VAD. We've decided on G.729B and AMR. I have...

Hello, I am implementing several standard VADs as a reference for my work in my internship on VAD. We've decided on G.729B and AMR. I have the C code and have read the documentation for the algorithms and for the code, but I seem to be missing something. Where is the VAD speech/non-speech decision output for these programs? Is it in the bitstream, or do I need to modify the code myself ...


G. 729 annex B

Started by ludovic44fr in Speech Coding18 years ago

hi everybody, I'm still working on the G. 729B, and to be honest i really struggle. I just realized (last page of the G 729B...

hi everybody, I'm still working on the G. 729B, and to be honest i really struggle. I just realized (last page of the G 729B datasheet) that a VAD simulation software exists somewhere in C (i.e. vad.c). Does any one where this software is available ? It will be very helpful for me.


g711 VAD

Started by merln101 in Speech Coding13 years ago 1 reply

Anyone can help finding code for g711 VAD calculation/energy calculation ? Many thanks Marly

Anyone can help finding code for g711 VAD calculation/energy calculation ? Many thanks Marly


VAD/CNG module for GIPS ILBC

Started by navithak in Speech Coding12 years ago 1 reply

Hi, I have implemented Gips ILBC codec on adsp 2185..However I am unable to find any information on the vad/dtx module..Is that royalty...

Hi, I have implemented Gips ILBC codec on adsp 2185..However I am unable to find any information on the vad/dtx module..Is that royalty free as well?? Where can I obtain it?Any information will be greatly appreciated Another question..Does ilbc pass dtmf tone?? regards Navitha


AMR/G729 VADs as benchmark

Started by smal...@yahoo.com in Speech Coding14 years ago

Dear all, I've downloaded the sourcecode for AMR speech codec (3GPP AMR reference ode). This codec optionally uses one of the 2 VADs...

Dear all, I've downloaded the sourcecode for AMR speech codec (3GPP AMR reference ode). This codec optionally uses one of the 2 VADs defined in the standard. I wanted some HELP , how to use the implemented VADs as a benchmark for my own vad. Specifically 1)how should I compile the sourcecodes in windows.(Is it possible to only compile the VAD codes, since I am just in


GSM FR VAD function

Started by yuehengs in Speech Coding16 years ago

I built a code for GSM FR VAD, which can pass all test vector without any problem. But when I test on board I notice if voice is...

I built a code for GSM FR VAD, which can pass all test vector without any problem. But when I test on board I notice if voice is not high enough, (voice input's amplitude is 8 bit with 13-bit full scale )for some certain voice like "goo..gle", the "oo" is cut and


abt VAD algorithm 1 of AMR codec

Started by Sameer Kibey in Speech Coding17 years ago

Hi all! i have a query regarding the VAD algorithm 1 used in GSM AMR speech codec.one of the steps in this algo is the use of a...

Hi all! i have a query regarding the VAD algorithm 1 used in GSM AMR speech codec.one of the steps in this algo is the use of a filter bank. this bank consists of 5th and 3rd order filter blocks. for the 3rd order filter block the equations are as follows :


about G729 framing details

Started by renzhengshu3 in Speech Coding8 years ago 4 replies

HI, all I have a question on G729 framing details I used a G729 codec to encode a .wav file before encoding, it is about 300 KB ...

HI, all I have a question on G729 framing details I used a G729 codec to encode a .wav file before encoding, it is about 300 KB after encoding using G729 without VAD , the encoded G729 file is still about 300 KB, why isn't there any compression on bytes? after encoding using G729 with VAD, the encoded file is about 250KB, only 50 KB smaller? Besides, according to a pos...


AMR Codec VAD

Started by Harsha in Speech Coding18 years ago 2 replies

Hi All,      Please let me know the actual difference between VAD option 1

Hi All,      Please let me know the actual difference between VAD option 1


rega G.711

Started by Mohan Reddy in Speech Coding12 years ago

Hi I am loking for a G.711 codec were do I get fixed point implememtation of it I want to use this to stream audio onto a network may be the...

Hi I am loking for a G.711 codec were do I get fixed point implememtation of it I want to use this to stream audio onto a network may be the internet, do i need Packet loss concealment for this codec, If so were do I get it. and also do I need discontinous transmission i.e VAD and CNG . thanks Mohan


VAD

Started by lmaigrot in Speech Coding18 years ago

I'm a student and i'm working on voice activity detection. I use ITU-T recommendation G-729 annexe B. Some equations are missing...

I'm a student and i'm working on voice activity detection. I use ITU-T recommendation G-729 annexe B. Some equations are missing on my G-729.I'm looking for some informations about the window used by linear prediction, about the linear predictions and the line spectral frequencies


reg. G.729 VAD

Started by tallapragada bramara in Speech Coding17 years ago

hello everybody, i am a new member to this group. in the G.729 Annex B, there is a comparision of full band energy with 15...

hello everybody, i am a new member to this group. in the G.729 Annex B, there is a comparision of full band energy with 15 db to decide whether the frame is voice or noise.but for low speech signals the full band energy values may be below 15db which results in a faulty


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


g.729 annex B

Started by lmaigrot in Speech Coding18 years ago

Hi all I have a problem with table of constant for multi-boundary initial voice activity decision. Basically i compare itu...

Hi all I have a problem with table of constant for multi-boundary initial voice activity decision. Basically i compare itu recommendation and c code. If you read comments in local function MakeDec in function vad.c, Q15 format are multiply by Q23 or other format while function


problems with SID bitstream

Started by Armen Baloyan in Speech Coding17 years ago 1 reply

hi all, i'm implementing VAD/CNG/DTX algorithm and have problems with SID bitstream, in Comfort Noise payload...

hi all, i'm implementing VAD/CNG/DTX algorithm and have problems with SID bitstream, in Comfort Noise payload draft-ietf-avt-rtp-cn-05.txt and in ITU-T Recomendationg.729 annex B is said , that noise level should be packed in 5 bits, but in Comfort Noise payload draft-ietf-avt-rtp-cn-05.tx