> On 03/16/2010 06:51 AM, halidziya yerebakan wrote:
>> Hi all;
>>
>> Thanks to Mr. Balister I run USRP on BeagleBoard (
>>
http://www.opensdr.com/node/17) . But it doesn't give any sound when I try
>> to listen FM radio. I think there is some mismatch in sampling rates or data
>> format. I read other mail list archives but they didn't solve my problem.
>> Here is my console :
>>
>> address@hidden:/usr/share/gnuradio/examples/usrp# ./usrp_wfm_rcv_nogui.py
>> Using RX d'board A: Basic Rx
>>>>> gr_fir_fff: using cortex_a8
>> Freq: 100.1M Volume:0.100000 Setting:FREQ
>> OK
>> aUaUaUaUaUaUaUaUuOaUaUaUaUaUuOaUaUaUaUaUuOaUaUaUaUaUuOaUaUaUaUaUuOaUaUaUaUaUuOaUaUaUaUuOaUaUaUaUaUuOaUaUaU
>>
>> (No Sound Here goes like this )
>
> Run oprofile, find the code that takes all the time, optimize using
> NEON, repeat :)
>
> The sample rate conversions will be the CPU hogs for this waveform. It
> looks like you are using an optimized fir filter already, but work
> through the sample rates at each step. It is possible the audio out is
> doing another rate conversion. Also, the gnuradio block may create a
> very long fir filter, you can adjust the filter design settings to
> reduce the number of taps.
>
> It will work, but you do not have many GHz of cpu to cover up
> in-efficient design decisions :)