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Why OMAP4460 Blaze tablet MIC tinycap 4 mic capture only @ 48 KHz and 32 bits/sample settings.

Hi all,

I am using tinycap to capture signals from 4 digital mics present in OMAP4460 Blaze tablet .

My tinycap settings are as follows.

tinycap /sdcard/test.pcm -D 0 -d 0 -c 4 -r 48000 -b 32 -p 768 -n 10

My question is 

1) Why am i not able to capture signals at sampling rate other than 48 KHz.

2) why cant i capture signals @ 16 bits /sample configuaration i.e. -b 16.

By the way  when i use device 1 i.e. -d 1 to capture 1 or 2 channel data i am able to capture signals @ samp_Rate other than 48 KHz and bits/sample as 16.

Regards,

Sreenivasa U