I just finish speech compression project on lpc2148 with adpcm encoding,but
compression ratio is only 1:4the time for one sample encoding at processor
Fosc MHz and PCLK=3Mhz is 8 uS(that support 44.1Khz sampling rate stereo.
But you need better compression factor :).
On Tue, Jun 23, 2009 at 1:43 PM, Michal Krestan wrote:
> Hello,
>
> does anyone have an idea how to make software speech compression with ratio
> at least 1:10 or better on ARM microcontroller? I have 16kHz/16bit audio
> stream, which I need to compress and send over narrow band link, so MCU
will
> not be doing almost anything else, than running speech codec. I'd
appreciate
> porting of speex or something similar with 1:16 ratio, but I'm not
sure,
> that LPC devices will be powerful enough for this codec. I've seen
STM32
> cortex with ported speex, but they have only 8kHz version and I need 16kHz
> sample rate.
>
> Michal
>
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>
>
>