What is u r requirement?
I am not sure but I think u must be looking for bit exact implementation.
If it is so then you may loose bit exact implementation if u modify the
algorithm.
You need to consider this before modifying the algorithm.
Regards,
Nitin
----- Original Message -----
From: <>
To: <>
Sent: Wednesday, March 02, 2005 10:21 AM
Subject: [speechcoding] AMR-WB optimization
> Hello everybody,
>
> I am working on the optimization of the AMR-WB speech codec code
obtained from ITU-T on the c6211 dsk. I have done the optimization techniques
suggested for TI's optimizing compiler like using intrinsics, loop trip
counts, scratch-pad memory etc..BUt still haven't acheived the desired
performance. The program takes 150 MCPS for full-duplex operation. I have to
make it work under 25 MCPS for full-duplex. I guess I have to do algorithmic
level optimization now. > I have some knowledge of the speech coding
algorithms. But I am not sure about where to start from. > Please guide me as to what are the steps that has
to be taken in this direction. What all things should be done. I would like to know whether
its
worth changing the algorithms. Or is there some other techniques like
decreasing the bits used for the fixed-point representation in some parts,
or change the tables that are used in the code-book search etc..Kindly list
all of the techniques like these that are normally used. If assembly coding
has to be done then how to choose the functions that needs to be optimized? >
> Thanks in advance for all your help..
>
> Regards
> Saleem
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Since you are going for algorithmic level optimization, you have to find which
part of the codec is more complex. I think the codebook search algorithm will
lead.
There also some function in the program which has small complexity but it will
be called many times so that the final complexity due to the function will be
large. So please find out which of the functions are called very frequently.
Because small saving in that function will result in large difference.
There also many algorithm available in the net for efficient code book search,
fast implementation of auto-correlation functions and convolution.
For example, convolution implemented using FFT requires less complexity.
Blakenship method of implementing autocorrelation have less complexity.
Regards
Venkat
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Reply by venkat ramanan●March 2, 20052005-03-02
Hai saleem,
Since you are going for algorithmic level optimization, you have to find which
part of the codec is more complex. I think the codebook search algorithm will
lead.
There also some function in the program which has small complexity but it will
be called many times so that the final complexity due to the function will be
large. So please find out which of the functions are called very frequently.
Because small saving in that function will result in large difference.
There also many algorithm available in the net for efficient code book search,
fast implementation of auto-correlation functions and convolution.
For example, convolution implemented using FFT requires less complexity.
Blakenship method of implementing autocorrelation have less complexity.
Regards
Venkat
Mistakes are not end of the world but repeating them is
Reply by ismail uzun●March 2, 20052005-03-02
Saleem,
I suggest you to implement some functions in ASM whcih take much processing
time. Some of those signal processing functions may be optimized by using
ASM features like circular buffers, filters etc.
Good Luck.
Ismail
----- Original Message -----
From: <>
To: <>
Sent: Wednesday, March 02, 2005 6:51 AM
Subject: [speechcoding] AMR-WB optimization
> Hello everybody,
>
> I am working on the optimization of the AMR-WB speech codec code obtained
> from ITU-T on the c6211 dsk. I have done the optimization techniques
> suggested for TI's optimizing compiler like using intrinsics, loop
trip
> counts, scratch-pad memory etc..BUt still haven't acheived the desired
> performance. The program takes 150 MCPS for full-duplex operation. I have
> to make it work under 25 MCPS for full-duplex. I guess I have to do
> algorithmic level optimization now.
> I have some knowledge of the speech coding algorithms. But I am not sure
> about where to start from.
> Please guide me as to what are the steps that has to be taken in this
> direction. What all things should be done. I would like to know whether
> its worth changing the algorithms. Or is there some other techniques like
> decreasing the bits used for the fixed-point representation in some parts,
> or change the tables that are used in the code-book search etc..Kindly
> list all of the techniques like these that are normally used. If assembly
> coding has to be done then how to choose the functions that needs to be
> optimized?
>
> Thanks in advance for all your help..
>
> Regards
> Saleem
>
>
Reply by ●March 2, 20052005-03-02
Hello everybody,
I am working on the optimization of the AMR-WB speech codec code obtained from
ITU-T on the c6211 dsk. I have done the optimization techniques suggested for
TI's optimizing compiler like using intrinsics, loop trip counts,
scratch-pad memory etc..BUt still haven't acheived the desired performance.
The program takes 150 MCPS for full-duplex operation. I have to make it work
under 25 MCPS for full-duplex. I guess I have to do algorithmic level
optimization now.
I have some knowledge of the speech coding algorithms. But I am not sure about
where to start from.
Please guide me as to what are the steps that has to be taken in this direction.
What all things should be done. I would like to know whether its worth changing
the algorithms. Or is there some other techniques like decreasing the bits used
for the fixed-point representation in some parts, or change the tables that are
used in the code-book search etc..Kindly list all of the techniques like these
that are normally used. If assembly coding has to be done then how to choose the
functions that needs to be optimized?