Re: [Freetel-codec2] CODEC problem

Sun, 12 Jun 2016 15:43:21 -0700

Anomadarshi ,

1) Are you using the optimized ARM supplied CMSIS DSP libraries ?

If not, you are probably missing out by a factor of >  2x  on performance.....

2) Are you using a compiler directive double >> float?

3) What compiler ?

regards


On 12/06/2016 11:19 PM, Anomadarshi Barua Shuvro wrote:
Hi Glen,

My hardware bottleneck is for low speed . I am using nRF52 which is a CortexM4 microcontroller with 64MHz clock speed and 64 KB of RAM . The problem is if I use 8KHz sampling rate the frame size is 20 ms for 160 samples ( 3200 kbps) . But conversion time to compress 20 ms frame is around 60 ms if I want to use 3200kbps CODEC . So I am missing 3 frames for each compression . So I am using 4 KHz sampling rate because 4KHz sampling rate would give me 40ms frame for 160 samples .


kind regards
Anomadarshi

On Sun, Jun 12, 2016 at 2:54 PM, glen english <[email protected]> wrote:
Nice one Jereon.

Anomadarshi,

where is your hardware bottleneck- why the sample rate limit- help us understand .

I thought that if you had a hardware bit rate limit, then going for 8 kHz sampling and 8 bit samples  would be the same information rate as 4 Khz sampling and 16 bit samples.

As Jereon says, you will need to format to suit the buffers and structs.



regards

On 12/06/2016 10:43 PM, Anomadarshi Barua Shuvro wrote:
Hi,

Thank you very much...You guys are doing really fantastic jobs..

kind regards
Anomadarshi

On Sun, Jun 12, 2016 at 2:23 PM, Jeroen Vreeken <[email protected]> wrote:
Hi Anomadarshi,

On 06/12/2016 02:11 PM, Anomadarshi Barua Shuvro wrote:
> Hi Glen,
> Thank you very much for your reply . I have few confusions. If I would
> use 8bit resolution per sample , then I would need to change line 3 in
> the following piece of code , right ? If I would change line 3 to  buf
> = (char*)malloc(nsam*sizeof(char)) , will it work ? I mean do I need
> to change anything inside of the codec ?
>
No, that won't work.
The codec expects a buffer of shorts. So even if you sample only bytes
you would still have to convert them to shorts.

This is the prototype of the encode function:
void codec2_encode(struct CODEC2 *codec2_state, unsigned char * bits,
short speech_in[]);

It has not changed by your change.

Regards,
Jeroen


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