Quantization performance of LSFs in G.723.1

Started by koro in Speech Coding16 years ago 3 replies

Hi everyone: I am working on the quantization of LSFs in G.723.1. I found that sometimes G.723.1 introduces a quite large ...

Hi everyone: I am working on the quantization of LSFs in G.723.1. I found that sometimes G.723.1 introduces a quite large percentage of outliers in the range of 2-4dB, for example, over 10%. So G.723.1 does not satisfy the transparent quantization? Is this correct? Could anyone


Difference among G.723, 729, 726

Started by Ramya Desai in Speech Coding15 years ago 1 reply

Dear Experts, I am new to this group and speech coding (But not to DSP) I want to know the details of G.723. But from ITU web ...

Dear Experts, I am new to this group and speech coding (But not to DSP) I want to know the details of G.723. But from ITU web site its not available and it recomended to use G.726 and G.729. What are the basic differences among G.723, G.726, G.729 ? How can I get G.723 standards ?. Regards, Ramya.


G.723.1 Annex B

Started by Anonymous in Speech Coding18 years ago

Hi,everyone: I'm writing a program about G.723.1,but now I cann't intergret G.723.1 Annex B in my program.Who can tell me how to...

Hi,everyone: I'm writing a program about G.723.1,but now I cann't intergret G.723.1 Annex B in my program.Who can tell me how to add Annex B code into my program?my program use Visual C++ 6.0. Another quertion is that whether Microsoft ACM uses G.723.1 Annex B. Thanks ver


Queries regarding G.723.1

Started by Nihal Ahmad in Speech Coding18 years ago 1 reply

Hi friends I am working on G.723.1 Annex B in simulink/Matlab environment. I have some doubts which I am giving below. If any...

Hi friends I am working on G.723.1 Annex B in simulink/Matlab environment. I have some doubts which I am giving below. If any body of you know the good material regarding to G.723.1 Annex B. Let me know. Regards Nihal -----------------------------------


questions about G.723.1 and G.729

Started by Yidan Zhou in Speech Coding17 years ago 2 replies

Hello all, After I went through the standard document of G.723.1 and G.729, there are several technical terms I don't understand. ...

Hello all, After I went through the standard document of G.723.1 and G.729, there are several technical terms I don't understand. 1. In G.723.1, what is the combinatorial coding for transmitting the pulse location? 2. In G.729, Why a low-pass filter can act as a tilt compensati


need help regarding bit stream file generated by G.723.1

Started by jayeshkumar makwana in Speech Coding11 years ago 1 reply

hi to all, =C2=20 I am currently working on G.723.1. I have ITU-T implementation of G.723.1. here G.723.1 encoder takes .tin as an input and...

hi to all, =C2=20 I am currently working on G.723.1. I have ITU-T implementation of G.723.1. here G.723.1 encoder takes .tin as an input and gives .rco as an output. it= means that .rco is a bit stream file. but I cant read that file properly b= ecause bit stream file should contain only two values representing 0 and 1.= .but here, this file contains varying values. =C2=20 anyone knows h...


.wav input to g.723

Started by learningdsp in Speech Coding15 years ago

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...

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 si


G.723.1 VOIP

Started by M.R.Saraj in Speech Coding18 years ago

Hello, While I was integrating the G.723.1 in a voip application, recent draft of IETF indicates that the payload format for...

Hello, While I was integrating the G.723.1 in a voip application, recent draft of IETF indicates that the payload format for G.723.1 is 20/24 bytes and nowhere specifies how to indicate the CRC to the other side decoder.Also, the payload format for SID is defined in RFC1890


Bandwidth expansion in G.723 and G.729

Started by Cool Dsp in Speech Coding16 years ago 1 reply

Hello, I am new to Speech Coding. I was reading through the ITU-T specs for G.723 and G.729. Can anyone enlighten me on the...

Hello, I am new to Speech Coding. I was reading through the ITU-T specs for G.723 and G.729. Can anyone enlighten me on the following aspects: The importance of bandwidth expansion after LPC estimation? Why this expansion is different for G.723(7.5 Hz) and


Is there any fast fcb search algorithm for G.723.1

Started by lily_yangzhou in Speech Coding17 years ago

Dear All, I'm now doing a transcoder between the G.723.1 and Gsm AMR. as we all now the fixed codebook search algorithm in the...

Dear All, I'm now doing a transcoder between the G.723.1 and Gsm AMR. as we all now the fixed codebook search algorithm in the reference G.723.1 cost much MIPS. I wonder if there are any much efficient search algorithm exist! Your reply would be highly appreciated


G.723.1 and loss concealment

Started by setumi71 in Speech Coding16 years ago

Hi, I am trying to build a new mechanism of loss concealment for the codec G.723.1. I've reconstructed the lost frames. These...

Hi, I am trying to build a new mechanism of loss concealment for the codec G.723.1. I've reconstructed the lost frames. These lost frames are calculated with Matlab and they are in a text file. Departing from this, is there a method in the code of G.723.1 to insert


G.723.1 Test Vectors

Started by jameel2510 in Speech Coding17 years ago

hi everybody we are working on the implementation of G.723.1 we require testVectors for G.723.1 to test the code if someone have...

hi everybody we are working on the implementation of G.723.1 we require testVectors for G.723.1 to test the code if someone have these vectors pls send those to my personal email or post it on the group pls do not send the vectors for Annex A,B,C regards


Harmonic noise shaping of G.723.1

Started by lyf219 in Speech Coding17 years ago

I do not understand the Harmonic noise shaping in G.723.1.Can someone send me some documents on it? Besides can someone send me...

I do not understand the Harmonic noise shaping in G.723.1.Can someone send me some documents on it? Besides can someone send me the code that is fixed point implementation of G.723.1? Thanks a lot!!


General queries in G.723.1

Started by Sameer Kibey in Speech Coding17 years ago

Hello everyone! Here are a few queries wrt G.723.1: 1.The G.723.1 recommendation specifies a total algoritmic delay of...

Hello everyone! Here are a few queries wrt G.723.1: 1.The G.723.1 recommendation specifies a total algoritmic delay of 37.5 ms.Out of this 30 ms is due to the frame size.The remaining 7.5 ms is due to "look ahead delay".What is meant by look ahead


qurey about G.723.1 bit stream file...help me please

Started by jays_21_13 in Speech Coding11 years ago

hi to all, I was working on G.729 till now. but now i have started my work on g.723.1. I have some query about bit stream file generated by...

hi to all, I was working on G.729 till now. but now i have started my work on g.723.1. I have some query about bit stream file generated by g.723.1 encoder. this bit stream file should contain only two values representing 0 and 1 as it is a bit stream file. but here it contains lots of varying values.i don't know why. can anyone explain it to me please? I think my source has problems......


Transcoder between G.729 & AMR & G.723.1

Started by gray_1024 in Speech Coding17 years ago

I'm now doing a transcoder between G.729 & G.723.1. Considering the conversion of pitch delay, since G.723.1 encodes speech...

I'm now doing a transcoder between G.729 & G.723.1. Considering the conversion of pitch delay, since G.723.1 encodes speech with 30ms frames, while G.729 with 20ms frames, how can i do? I attempt to convert the pitch delay using linear interpolation, but the perform


g.723 decode

Started by ahwh66 in Speech Coding15 years ago

hi all, when decoding g.723 frame, what does the parameter "crc" mean? thanks,

hi all, when decoding g.723 frame, what does the parameter "crc" mean? thanks,


LSP in g.723.1 floating point

Started by milamine in Speech Coding16 years ago

hi all i'm working on PLC with th g.723.1 vocoder when checking out the LSP frequencies i came up with some strange ...

hi all i'm working on PLC with th g.723.1 vocoder when checking out the LSP frequencies i came up with some strange frquencies knowing that 0 <= LSP <= pi !!! (i.e 4,.. 10,.. 80,... . . . . 210,.. 233.,


LSF in g.723.1

Started by milamine in Speech Coding16 years ago 1 reply

hi all i'm working on quantizing the LSF can i use the LSF generated by the VOCODER g.723.1? and if so how can i get them....

hi all i'm working on quantizing the LSF can i use the LSF generated by the VOCODER g.723.1? and if so how can i get them. Thx a lot.


MP-MLQ

Started by prajesh_etc in Speech Coding16 years ago 3 replies

Hi everyone, I am working on ITU Standard G.723.1, ie. speech coder(Hybrid coder)i have started the project one month back. I have...

Hi everyone, I am working on ITU Standard G.723.1, ie. speech coder(Hybrid coder)i have started the project one month back. I have almost designed the h/w for it. And in s/w part i have gone through th b/d of G.723.1, I am clear with most of the thing but i am unable to underst