Hi every one ;
I listen music in my beagle board now
I use file sink
self.gr_wavfile_sink_0 = gr.wavfile_sink("dosya.wav", 1,32000 , 8)
than I play with alsa tools
aplay -t wav -c 2 -r 32000 -f S16_LE -v dosya.wav
On Thu, Mar 18, 2010 at 1:27 PM, Philip Balister <[email protected]>wrote:
> On 03/18/2010 07:21 AM, halidziya yerebakan wrote:
>
>> Any way , my cpu is not very busy when it is working problem is some where
>> else acording to me ,
>> I don't know how to use blocks in python but maybe we can create a block
>> between audio device and output device that converts 32 khz to 48 khz
>>
>
> When it underflows, I suspect there is idle time while the system recovers.
> That drops the apparent CPU usage. Most likely the flowgraph is waiting on
> the IO to notify you the underflow occurred.
>
>
> audio_decimation = 10
>> audio_rate = demod_rate / audio_decimation # 32 kHz
>>
>
> The fm demod already has a sample rate conversion in it, but it only
> supports decimation, not resampling to an arbitrary rate. If you use an
> external resampler to get the 32 kHz back to 48 kHz, you have two different
> FIR filters running, when you really only need one.
>
> Philip
>
>
>
>
>>
>> On Thu, Mar 18, 2010 at 1:08 PM, Philip Balister<[email protected]
>> >wrote:
>>
>> On 03/17/2010 03:15 PM, Jeff Brower wrote:
>>>
>>> Halidziya-
>>>>
>>>>
>>>> My beagle board is clone and it is working in 200MHZ , but when I run
>>>> the
>>>>
>>>>> program
>>>>> it doesn't consumes to much CPU time
>>>>>
>>>>>
>>>> A Beagle board clone? The Beagle board already costs less than its
>>>> component BOM.
>>>> Did you alter the design in some way?
>>>>
>>>>
>>> There is the EBV clone in Europe and possibly ones from India and China.
>>> It
>>> is easy to clone :) I don't think the Beagle sells under material cost,
>>> but
>>> I suspect the margin is not a sustainable business model.
>>>
>>>
>>>
>>> Also, why only 200 MHz? That's way slow... what is the reason?
>>>>
>>>>
>>> That sounds wrong. Stock Beagles run at 500 MHz and can be turned up to
>>> 600
>>> MHz. Newer Beagles run up to 720Mhz
>>>
>>> Yes, using the DSP is very interesting. Approaches range in complexity
>>> from
>>> wrapping a call to do the processing in the DSP from the existing
>>> gnuradio
>>> block structure to integrating the DSP into the gnuradio block scheduler.
>>>
>>> Philip
>>>
>>>
>>> -Jeff
>>>>
>>>>
>>>> On Tue, Mar 16, 2010 at 9:59 PM, Jeff Brower<[email protected]>
>>>>
>>>>> wrote:
>>>>>
>>>>> Philip-
>>>>>
>>>>> > 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 :
>>>>> >>
>>>>> >> r...@beagleboard:/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 :)
>>>>>
>>>>> At what rates are the OMAP 3530 cores running on the Beagle board?
>>>>> ?
>>>>> The
>>>>> web page says "up to" 600 MHz for the ARM A8
>>>>> and up to 430 MHz for the C64x+ core. ? Sometimes TI eval/dsk
>>>>> boards
>>>>> don't always run at max rate...
>>>>>
>>>>> Also, do you know if anyone has done work to port GNU radio
>>>>> functions
>>>>> over to the C64x+ core? ? For example you mention
>>>>> sample rate conversion, that would be very suitable to offload
>>>>> onto
>>>>> the
>>>>> DSP.
>>>>>
>>>>> -Jeff
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Discuss-gnuradio mailing list
>>>>> [email protected]
>>>>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Sayg?±lar;
>>>>> Halid Ziya Yerebakan
>>>>>
>>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>>
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>>>>
>>>
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>>>
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>>
>>
>>
--
Saygılar;
Halid Ziya Yerebakan
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