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Discussion Groups | Speech Coding | Re: G.723.1 Optimization
Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)
G729 Annex D Porting - Gram Smi - Mar 13 15:14:00 2003
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Hi All, First of all, I'm new in speech coding. Some days ago, I got the G.729 Annex D source code from ITU's page. Now, I'm involved in porting this code to our system, with a H8/2633 (16 bits) microcontroller, and my first attempt has been awful. ¿Is it possible to do? ¿Am I crazy? ¿Which are the lowest hardware requirements to do it? ¿Is it mandatory to use a DSP? Help please!!!! Thanks in advance
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Re: G729 Annex D Porting - Mark Lakata - Mar 13 18:33:00 2003
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For G.729, you need roughly a 100MHz 32 bit general processor to do encode+decode with optimized C. With a DSP, you can do it in about 20MHz. A 64bit processor with DSP extensions can do it in about 30-40MHz. I have not looked at the Annex D... I don't know how that affects the baseline performance. You also need to be able to do multiplies very fast, about 2 16x16 multiplies per cycle on average. It appears that the H8S/2633 doesn't even have a multiplier. So, it is basically impossible. Mark Lakata, Staff Engineer 1225 Charleston Road voice 650-567-5170 MIPS Technologies Mountain View CA 94043 fax 650-567-5002 On Thu, 13 Mar 2003, Gram Smi wrote: > Hi All, > > First of all, I'm new in speech coding. Some days ago, I got the G.729 Annex D source code from ITU's page. > > Now, I'm involved in porting this code to our system, with a H8/2633 (16 bits) microcontroller, and my first attempt has > been awful. > > ¿Is it possible to do? ¿Am I crazy? > > ¿Which are the lowest hardware requirements to do it? ¿Is it mandatory to use a DSP? > > Help please!!!! > > Thanks in advance > ________________________________________________________________________________\ ___________________________________________________ > > Tu cuenta de correo gratuita Mixmail > Ya.com ADSL: Router U.S. Robotics ¡Gratis! > > Yahoo! Groups Sponsor > > ADVERTISEMENT > width > width > _____________________________________ > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Re: G.723.1 Optimization - Hemant - Mar 14 7:11:00 2003
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Hi List, I have been involved with G.723.1 for quite some time. Right now, my implementation which is compatible with ITU G.723.1 is working fine. I want to further optimize it. Can someone guide me about the steps needed to do that ? rgds, Hemant Kumar |
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Re: G729 Annex D Porting - chetan k - Mar 14 9:09:00 2003
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Hi, U R not crazy, It is possible provided the processor is running at arround 100 Mhz. It is recomended to Implement G.729 on a DSP since the code is MAC intensive, and DSP is meant for this purpose. This can be Implemented on a low cost low power DSP such as a TiC54x, which is a 16bit 100 Mhz processor. Arround 7 channels of G.729 can be run on this processor, ie only about 14% of processor speed is used by a single channel G.729. U can also choose a RISC microprocessor like ARM with or without DSP extension's where about 25-30% of the processor speed is used. Good luck, go ahead and Implement. ===== With Rgds Chetan k. |
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Re: G.723.1 Optimization - Author Unknown - Mar 20 20:58:00 2003
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Hi Hemant: This is Hemant who was at AT&T Wireless, right? I have c code for 723.1 which you could use to create an optimized assembly language version. Or perhaps you were asking for algorithmic optimization? I'm not sure. In any case, if you want the c code let me know and I will try to find it in my pile of things from AT&T Wireless. Still getting all A's?????? Chuck In a message dated 3/14/2003 2:11:58 AM Eastern Standard Time, writes: > > Hi List, > I have been involved with G.723.1 for quite some time. Right now, my implementation which is compatible with ITU G.723.1 is working fine. I want to further optimize it. > Can someone guide me about the steps needed to do that ? > rgds, > Hemant Kumar > _____________________________________ |
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