[hpsdr] question on using FFTs in SDR

[Greg Overkamp]

I have a couple questions on how the FFT is used in
software defined radios to do filtering.

1) Is the time-domain data input to the FFT, and the
time domain output of IFFT, overlapped in time? If so,
what is the extent of the overlap?

2) Is a window function applied to the time domain
data before the FFT?

Any help is much appreciated.
Greg
WD9DEX