Posted on May 17, 2011 at 13:10HI
i am trying to port Speex on STM32 Controller using gnutools. I am able to port AN2812 Provided by ST on my platform successfully. I am using narrowband with Quality bit=4 and audio is good. Now when i try with Quality bit 6 or 8 audio quality is garbage.
To debug this issue i have downloaded speex latest version from its site. I found that in narrowband, when we have Quality bit=4, Encoded Frame size is 20B. For Quality bit=6, Encoded Frame size 28B and for Quality bit=8 Encoded Frame size is 38B. While in AN2812 speex Library, Encode Frame size for Quality bit=6 is 20B and for Quality bit=8, Encode Frame size is 24B
Is there any hard coded settings in AN2812, other then opensource speex for Encode Frame Size or Quality bit?
I am not sure whether this AN2812 is testing for higher bitrate or not.
Thanks
Yuvraj
