Configuring Sampling Rates 8 kHz and 16 kHz dynamically in CQ93VC in DM368

Hi Sreedhar,

Yes, you should be able to switch between those sampling rates dynamically as linux codec driver supports both them.

sound/soc/codecs/cq93vc.c: #define CQ93VC_RATES    (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000)

Thanks,

Prakash

Hi Prakash,

Thank you for the reply. I am selecting the sampling frequency 8 or 16 kHz in menuconfig. I dont see a place where i can switch between them dynamically.

Internal codec supports 8 and 16 kHz but how to swicth between them dynamically. do you have any syntax code to check this.

-Sreedhar.

Hi Prakash,

Thank you it worked.

I have one question. with the command you have provided will it capture and playback the same data at the same time?

arecord -f S16_LE -r 8000 | aplay -f S16_LE -r 8000 

-Sreedhar.

Yes It is loopback test, where you should be able to playback audio samples on speaker/line_out captured via mic/line_in.

Thanks,

Prakash

Hi,

I have a problem related to this.

Using DM365 voice codec on a custom board.

When capturing audio at 16KHz using arecord or gstreamer, the recording is high pitched. If I use audacity to drop the pitch 50% then it sounds fine, so it looks like sampling is actually happening at 8KHz but is being tagged as 16KHz.

This is a major issue because aac encoder doesn't work with 8KHz input source.

Any clue what I may have missed in settings? (For me menuconfig does not have a frequency selection setting).

-Akshay