Re: Speech Coding Algorithm applied in 8-bit controller | Speech Coding

Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)

If you're targetting an 8 bit micro, I should stick to uLaw, A-Law and simple forms of ADPCM. They all code up well - but just about everything else uses large quantities of 16 bit multiplications, making them impractical for 8 bit systems. I had a go at implementing lattice filters on 8 bit micros, and believe me it is UGLY! I don't know if the Intel DVI ADPCM codec has any licensing issues, but its probably a good place to start developing your own algorithm anyway. Source for that is not hard to find, and although it is copyrighted, once you've seen the code you will want to rewrite it anyway. (One hint for the DVI ADPCM decoder - if you have a few spare K, you can code the entire differential calculation as a state machine. That makes the decoder incredibly efficient - I coded it in 6 ARM instructions!)

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Re: Speech Coding Algorithm applied in 8-bit controller - Author Unknown - Nov 8 9:00:00 2001