file: alphaspec/outline1.wpd first notes, March 24, 2003 jbh

prepare Bibliography of DFT's in radio astronomy.

DFT techniques - how many bits for certain RFI suppression, Afterwards truncation and scaling. Conversion to power

FFT

FFT improvements - number theoretic transforms, etc.

Polyphase - FIR filter ahead of FFT to give squarer spectral window

Overlap problem? (loss of sensitivity if time series don't overlap?)

Multirate? ('decimation')

Simulations

Simultaneously in same chip:

Pulsar fft 4 x 1k over 100 MHz (300 Mhz total w/overlap)

Galactic fft 1 x 16k over 300 MHz