Thread: Real time FFT?
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Old 06-30-2009, 02:40 PM
Fred Marshall
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Default Re: Real time FFT?

Jerry Avins wrote:
> westocl wrote:
>> Hello all.
>>
>> Is it feasable to do an fft in 'real time' on different 'blocks' of
>> data? (i understand the nomenclature real time may be inappropriate).
>>
>>
>> Im thinking, in general usage of an FFT, some x[n] comes in one
>> sample at a time and fills up a buffer and when that buffer (lets
>> call it 128 time domain samples) is filled a FFT is taken and the
>> 'output' is 128 points of frequncy domain data.
>>
>> Now.. instad of somthing like a sliding DFT where a window evaluates
>> the previous 127 samples along with one new one, i have a situation
>> where i want to give the 'fft buffer' 128 NEW data points... so
>> every single 'time instant'...128 new x[n] data are available.
>>
>> If this were done would I get a new FFT output at every time instant?

>
> You confused me. 128 new instances of x[n] for every n? How?
>
> Jerry


Sounds like a frequency domain beamformer. Is that possible here?

Fred


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