[hpsdr] new architecture - FFT front-end

[Alberto I2PHD]

On 9/9/2014 11:20 PM, Erik Anderson wrote:

> /To take an extreme example, someone talking for 5sec is not going to show up well after an FFT (the voice frequencies 
> are too transient to show up in the average) and the resulting frequency information does not carry enough data to be 
> able to reproduce the contents of the speech in an iFFT operation./

This can easily be checked with Matlab... digitize your 5-second speech with one of the many programs that allow to do 
that, producing a WAV file, then import that WAV file into Matlab, compute an FFT of it, do an inverse FFT, then 
playback the resulting data. If your digitization respected the Nyquist criterion, what you will hear is 
indistinguishable from the playback of the original WAV file.

-- 
/*73 Alberto I2PHD*
Credo Ut Intelligam



/
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