[Discuss-gnuradio] data from adc

2010-01-18 Thread Kyungtae Kim
Hi,

 

Is there a way to get the data from ADC directly? I can find some
examples to get it with using FFT, however without FFT, I wonder how it
can be gotten.

 

Thanks,

Kyungtae

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Re: [Discuss-gnuradio] data from adc

2010-01-18 Thread Sebastiaan Heunis
Kyungtae

Do you mean directly after it is sampled, before any of the DDC
functions?  Then the answer is no.  You will have to decimate by a
factor of at least 4 when using real sampling and 8 when using complex
sampling to be able to get the data over the USB link (for the USRP1).

Sebastiaan

-- 
Sebastiaan Heunis
Radar Remote Sensing Group, University of Cape Town, South Africa
Tel:  +27 72 950 9370


On Mon, Jan 18, 2010 at 7:46 PM, Kyungtae Kim kyung...@nec-labs.com wrote:
 Hi,



 Is there a way to get the data from ADC directly? I can find some examples
 to get it with using FFT, however without FFT, I wonder how it can be
 gotten.



 Thanks,

 Kyungtae

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 Discuss-gnuradio@gnu.org
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RE: [Discuss-gnuradio] data from adc

2010-01-18 Thread Kyungtae Kim
Thanks Sebastiaan. Now I know what the decimation means. Then, if I
decimate by 4 or 8, how I can get the sampled values before reaching fft
bins. What I want to do is to measure the noise power.

Thanks,
Kyungtae

-Original Message-
From: Sebastiaan Heunis [mailto:sheu...@gmail.com] 
Sent: Monday, January 18, 2010 1:11 PM
To: Kyungtae Kim
Cc: Gnuradio
Subject: Re: [Discuss-gnuradio] data from adc

Kyungtae

Do you mean directly after it is sampled, before any of the DDC
functions?  Then the answer is no.  You will have to decimate by a
factor of at least 4 when using real sampling and 8 when using complex
sampling to be able to get the data over the USB link (for the USRP1).

Sebastiaan

-- 
Sebastiaan Heunis
Radar Remote Sensing Group, University of Cape Town, South Africa
Tel:  +27 72 950 9370


On Mon, Jan 18, 2010 at 7:46 PM, Kyungtae Kim kyung...@nec-labs.com
wrote:
 Hi,



 Is there a way to get the data from ADC directly? I can find some
examples
 to get it with using FFT, however without FFT, I wonder how it can be
 gotten.



 Thanks,

 Kyungtae

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 http://lists.gnu.org/mailman/listinfo/discuss-gnuradio




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