archive: SETI Re: High bandwidth digitizer, FFT's, and analyzer

SETI Re: High bandwidth digitizer, FFT's, and analyzer

David Woolley ( david@djwhome.demon.co.uk )
Wed, 30 Sep 1998 22:40:12 +0100 (BST)

> " 10Gflops of processing power to FFT your 100Mhz samples "

Some further information. The specgrm2 FFT program has 30 instructions
in the basic operation, including 4 multiplies, 2 adds, and 2 subtracts
on the actual data, which gives order 20 Gflops, or 100 Gips; the processor
clock cycle count will obviously be several times this.

This is for the Intel assembler version; a pure C one would probably
be slower.

specgrm2 actually uses fixed point, not floating, arithmetic.