search for: 32mhz

hi, I am porting opus encoder to a low end device with 32K ram, 256K flash and 32MHz arm M3 mcu. But opus seems consume too much. To make it work , what I can think of 1, Only fixed point supported 2, Only mono voice application supported 3, Set complexity to zero 4, Support only one sample rate, like 16KHz 5, Silk mode only or Celt mode only My question is ,...

...m a PDM microphone (64 sample frame) and pass it directly to an I2S device i.e. from ISR to ISR. With uncompressed audio this works just fine. Now I try to insert OPUS1.3 in the path but cannot make it work. The audio passes through but ends up “down pitched” and heavily distorted. Due to the 32MHz base clock (+ prescalers) available it is not possible to get the desired 16kHz sample rate. I am therefore forced to work with 15625Hz. As I understand it the opus encoder does not mind a strange sample rate as it will re-sample it to 48kHz (Correct?). The decoder, however, will always output 4...

...i.e. from ISR to ISR. With uncompressed audio this works just fine. >> >> >> >> Now I try to insert OPUS1.3 in the path but cannot make it work. The >> audio passes through but ends up “down pitched” and heavily distorted. >> >> >> >> Due to the 32MHz base clock (+ prescalers) available it is not possible >> to get the desired 16kHz sample rate. I am therefore forced to work with >> 15625Hz. >> >> >> >> As I understand it the opus encoder does not mind a strange sample rate >> as it will re-sample it to...

(Note to self: learn to scan the full digest for later messages in a thread before replying to an earlier message.) Ed, Your reply to John answered some of my questions, but not all, and raised a new one: > Maybe I should have been a bit clearer; we're really interested in full > memory and type safety. We want to harden the system against memory > corruption vulnerabilities.