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Discussion Groups | Speech Coding | Re: Queries regarding G.723.1
Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)
Queries regarding G.723.1 - Nihal Ahmad - Mar 28 6:12:00 2001
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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 ---------------------------------------------- The standard is specifying some equations in the MP-MLQ block ,but it is not clear what different operations are being performed by the block. 1)I would like to know what are all the inputs to the MP-MLQ/ACELP block other than h(n) and r(n). & what are the transmitted parameters 2) what are the distinct operations that are performed by this block(are we finding the excitation vector v(n) or it is accessec by this block during computation). 3)the estimated gain is Gmax is found by equation (25) we are quantizing it using logarithmic quantizer of 24 steps of 3.2db each.but it says around this Gmax(q) we find more values in the range –3.2db to +6.4db. how many values are we finding and how? 4)the last para of the block says if the value of L0 or L2 is less than 58 we use a train of dirac functions instead of a single dirac function.please explain the reason and theory behind this Please Provide hierarchical flow diagram/chart/steps for the MP-MLQ & ACELP blocks .ANSI C code provides functions that do different tasks but they are so much interconnected that it is very difficult to understand the code without going thru the whole C code.What I want is logical flow in the functions and briefly describing the those functions. __________________________________________________ | |||
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Re: Queries regarding G.723.1 - Author Unknown - Sep 30 18:31:00 2001
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Hi all, I am working in a project on g723.1.I wanted to know the purpose of converting the lpc coefficients to lsp frequencies.Also in the 4 subframes that we are creating why do we convert the 10 lpc coefficients coming out of the last subframe only to 10 lsp frequencies.Again we are converting these lsp frequencies back to the lpc coefficients . while transmitting are we transmitting all the 40 lpc coefficients or just the lsp frequencies.please help me to understand the process clearly. Thanks and regards, Karthikeya raghav --- In speechcoding@y..., Nihal Ahmad <q_nihal@y...> wrote: > 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 > > ---------------------------------------------- > > The standard is specifying some equations in the > MP-MLQ block ,but it is not clear what different > operations are being performed by the block. > > 1)I would like to know what are all the inputs to the > MP-MLQ/ACELP block other than h(n) and r(n). > & what are the transmitted parameters > > 2) what are the distinct operations that are performed > by this block(are we finding the excitation vector > v(n) or it is accessec by this block during > computation). > > 3)the estimated gain is Gmax is found by equation (25) > we are quantizing it using logarithmic quantizer of 24 > steps of 3.2db each.but it says around this Gmax(q) we > find more values in the range –3.2db to +6.4db. how > many values are we finding and how? > > 4)the last para of the block says if the value of L0 > or L2 is less than 58 we use a train of dirac > functions instead of a single dirac function.please > explain the reason and theory behind this > > Please Provide hierarchical flow diagram/chart/steps > for the MP-MLQ & ACELP blocks .ANSI C code provides > functions that do different tasks but they are so much > interconnected that it is very difficult to understand > the code without going thru the whole C code.What I > want is logical flow in the functions and briefly > describing the those functions. > __________________________________________________ |
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