|
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 compensation filter? 3. In G.729, a bandwidth expansion is applied before the levinson durbin. It is said that expansion is used for white noise correction. Then what's the meaning of white-noise correction? Anyone knows the answers to these question, please do me a favor. Thanks in advance! Best regards, Yidan Zhou |
|
|
questions about G.723.1 and G.729
Started by ●December 9, 2002
Reply by ●January 17, 20032003-01-17
|
Hi all As we know in the channel vocoder each segment of input speech is analyzed using a bank of band pass filters called the analysis filters The energy at the output of the each filter is estimate at fixed intervals and transmitted to the receiver. what is that energy and how to quantify that ?? please if anybody know about basic fundametal of this please reply soon with regards "Yidan Zhou <>" <> wrote: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 compensation filter? 3. In G.729, a bandwidth expansion is applied before the levinson durbin. It is said that expansion is used for white noise correction. Then what's the meaning of white-noise correction? Anyone knows the answers to these question, please do me a favor. Thanks in advance! Best regards, Yidan Zhou _____________________________________ Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. _____________________________________ About this discussion group: To Join: To Post: To Leave: Archives: http://www.yahoogroups.com/group/speechcoding Other DSP-Related Groups: http://www.dsprelated.com |
|
|
Reply by ●January 18, 20032003-01-18
|
hi over there, What I know about it is that the energy is the fft of the filtered signal power 2 and you might divide this by the number of samples. But if you have the coder I guess you have a decoder ???? or you can find one maybe on sourceforge.org hope it helps 17/01/03 08:43:52, <> a rit: > > > "Yidan Zhou <>" > <>, > > De: <> > Date: Thu, 16 Jan 2003 23:43:52 -0800 (PST) > Sujet:Re: [speechcoding] questions about G.723.1 and G.729 > > Hi all > > As we know in the channel vocoder each segment of input speech is analyzed > using a bank of band pass filters called the analysis filters > The energy at the output of the each filter is estimate at fixed intervals > and transmitted to the receiver. > > what is that energy and how to quantify that ?? > > please if anybody know about basic fundametal of this please reply soon > > with regards > > "Yidan Zhou <>" <> > wrote: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 compensation > filter? > 3. In G.729, a bandwidth expansion is applied before the levinson > durbin. It is said that expansion is used for white noise > correction. Then what's the meaning of white-noise correction? > Anyone knows the answers to these question, please do me a favor. > Thanks in advance! > > Best regards, > > Yidan Zhou > _____________________________________ > Note: If you do a simple "reply" with your email client, only the author of > this message will receive your answer. You need to do a "reply all" if you > want your answer to be distributed to the entire group. > > _____________________________________ > About this discussion group: > > To Join: > > To Post: > > To Leave: > > Archives: http://www.yahoogroups.com/group/speechcoding > > Other DSP-Related Groups: http://www.dsprelated.com > HGTV Dream Home Giveaway > _____________________________________ > Note: If you do a simple "reply" with your email client, only the author of > this message will receive your answer. You need to do a "reply all" if you > want your answer to be distributed to the entire group. > > _____________________________________ > About this discussion group: > > To Join: > > To Post: > > To Leave: > > Archives: http://www.yahoogroups.com/group/speechcoding > > Other DSP-Related Groups: http://www.dsprelated.com > |
