Re: [Discuss-gnuradio] FM Receiver

[Anoth]

Yes, you must be right, I must have made a mistake when I set up the flow
graph. How do you know the sample rate delivered by the UHD and how is the
Polyphase Resampler implemented into the flow graph ?

Francois


Tom Rondeau wrote:
> 
> On Thu, Feb 24, 2011 at 7:17 PM, Anoth <address@hidden> wrote:
>>
>> Hi Josh,
>>
>> Yes, I have already though about that and I tried to match the sample and
>> sound card rates without success (but I might made a mistake). I have
>> also
>> read on the Internet that it might come from the sound card which cannot
>> support all rates but I did not find anything more about that subject.
>> Here
>> the python code generated by GRC :
>> http://old.nabble.com/file/p31009164/wfm_rx.py wfm_rx.py
>>
>> Francois
> 
> I think Josh is right and it's a sampling rate error. When you set the
> sampling rate of the USRP, ask the UHD driver what the current
> sampling rate is. Use what it returns to you to adjust the sampling
> rate properly. I ran into this same issue and solved it by using the
> pfb_arb_resampler block (Polyphase Resampler in GRC) to adjust the
> rates correctly.
> 
> Tom
> 
> 
>> Josh Blum-2 wrote:
>>>
>>>
>>>>>>> gr_fir_ccc: using SSE
>>>> aUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaU
>>>>
>>>
>>> These characters being printed means that you have mismatched sample
>>> rates between your USRP device and sound card. Could this be the case?
>>>
>>> -josh
>>>
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>>>
>>
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