.wav-> G.723

Started by learningdsp in comp.dsp13 years ago 3 replies

Hello, I am a beginner and trying to understand the working of G.723 ADPCM. I have been able to get all the C files from ITU for the G.723...

Hello, I am a beginner and trying to understand the working of G.723 ADPCM. I have been able to get all the C files from ITU for the G.723 ADPCM. I have a basic question. According to the documentation and block diagram the first block converts the input signal from linear or A-law or U-law to uniform PCM signal. Then come the next steps of finding the difference signal, etc.. I ha...


VAD implementation in G.723.1?

Started by Anonymous in comp.dsp12 years ago 2 replies

Hi, I wanted to know how Voice Activity Detection (VAD) is handled in G.723.1 speech codec. How silence is detected and what parameters...

Hi, I wanted to know how Voice Activity Detection (VAD) is handled in G.723.1 speech codec. How silence is detected and what parameters are passed to the decoder? Also what the decoder does in this case? I appreciate any help on this. hitesh_dj


Audio codec for G.729/G.723.1/G.726/G.728

Started by Josh in comp.dsp11 years ago 2 replies

I found a website(http://www.imtelephone.com) that provide audio codec(G.729, G.723.1,G.726,G.728). It has a very simple interface and you can...

I found a website(http://www.imtelephone.com) that provide audio codec(G.729, G.723.1,G.726,G.728). It has a very simple interface and you can easily intergrate into your software. .


The ITU G.723.1 test vectors

Started by steveu in comp.dsp6 years ago 9 replies

I have been playing with the ITU reference code for the G.723.1 speech codec. If I build and run the floating and fixed point versions of...

I have been playing with the ITU reference code for the G.723.1 speech codec. If I build and run the floating and fixed point versions of the codec they seem to work OK, but the floating one doesn't pass the test vectors that come with the code. It looks like the expected results of tests are wrong. When VAD/CNG is enabled they seem to expect an unrealistically high SNR to pass the tests. Can anyo...


Need some information on Voice codecs

Started by Parthasarathy in comp.dsp13 years ago 2 replies

Hello people Can any one tell me where I can buy G.723 and G.729 voice codecs? What would be the approx cost of those? Please give...

Hello people Can any one tell me where I can buy G.723 and G.729 voice codecs? What would be the approx cost of those? Please give the links. Requirement is urgent. One more query Asumming that, one has a complete understanding of the CODEC, what could be the likely time its going to take to prepare DSP based solution of our own. Thanks in advanve ...


audio transcoding

Started by DragosD in comp.dsp12 years ago 1 reply

Hi all, I was wondering if anyone can give me some information (links, forums, possible books) on audio transcoding topic. I've been assigned...

Hi all, I was wondering if anyone can give me some information (links, forums, possible books) on audio transcoding topic. I've been assigned this task and I need a starting point. I'm generally interested in audio transcoding but more specific in G.729.A or G.729.AB to G.723.1A transcoding. Now the trick is the transcoding path should be direct without going through G.711 Many thank...


AMR- WB & AMR- NB

Started by rajanikanth in comp.dsp12 years ago 1 reply

Hi to all, I am doing projects of AMR- WB(ITU G.722.2) & AMR- NB implementation on ARM9E. I have the following doubts, please...

Hi to all, I am doing projects of AMR- WB(ITU G.722.2) & AMR- NB implementation on ARM9E. I have the following doubts, please clarify. 1) What are the standards for AMR- NB? Is 3gpp AMR-NB same as ITU G.723.1 ? 2) AMR- WB and GSM-AMR are same or not ? 2) What is the difference between ARM and TI- processors in the MIPS point of view ? 3) How many MIPS the AMR- WB will...


Companies with VAD/VOX solutions?

Started by Matt Roos in comp.dsp12 years ago 3 replies

Hi, All. I need to find out all I can about voice activity detection (VAD) and companies that supply hardware or software implementations. This...

Hi, All. I need to find out all I can about voice activity detection (VAD) and companies that supply hardware or software implementations. This could include C code for PCs or DSPs as will as hardware black boxes with a mic/audio input and some sort of output switch or interrupt. I'm especially interested in non-standard solutions (e.g., not G.729, G.723.1, AMR) since there seem to be ple...


Need info on speech CODECS

Started by Anonymous in comp.dsp12 years ago 2 replies

Hi, I work for a Multimedia startup company. we are luking for speech codecs implemented on ARM9 platform for our end system.Can any one...

Hi, I work for a Multimedia startup company. we are luking for speech codecs implemented on ARM9 platform for our end system.Can any one give some info abt good companies who does Porting of speech codecs. we need ITU G.723.1 or 3gpp AMR-NB and G.726, G.711. Also cud any tell me how much each codec will cost(in USD$)so that we can choose the one which fits our budget. TIA.