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Mark Borgerding 2004-04-04 22:12:40 +00:00
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@ -35,13 +35,13 @@ Code definitions for 1d complex FFTs are in kiss_fft.c.
You can do other cool stuff with the extras you'll find in tools/ You can do other cool stuff with the extras you'll find in tools/
* arbitrary dimension FFTs (complex only currently, apologies to Steve DeKorte -- mebbe next time ) * arbitrary dimension complex FFTs
* real FFTs * 1-d real FFTs
* fast convolution filtering * fast convolution FIR filtering
* spectrum image creation * spectrum image creation
The core fft and most tools/ code can be compiled to use float, double The core fft and most tools/ code can be compiled to use float, double
or 16bit short samples. The default is float. or Q15 short samples. The default is float.
BACKGROUND: BACKGROUND:
@ -86,12 +86,11 @@ UNDER THE HOOD:
No scaling is done. Optimized butterflies are used for factors 2,3,4, and 5. No scaling is done. Optimized butterflies are used for factors 2,3,4, and 5.
The real optimization code only works for even length ffts. It does two half-length The real optimization code only works for even length ffts. It does two half-length
FFTs in parallel (packed into real&imag) then twiddles. FFTs in parallel (packed into real&imag), and then combines them via twiddling.
The fast convolution filtering uses the overlap-scrap method, slightly The fast convolution filtering uses the overlap-scrap method, slightly
modified to put the scrap at the tail. modified to put the scrap at the tail.
LICENSE: LICENSE:
BSD, see COPYING for details. Basically, "free to use&change, give credit where due, no guarantees" BSD, see COPYING for details. Basically, "free to use&change, give credit where due, no guarantees"
@ -105,7 +104,6 @@ TODO:
*) Make doc describing the overlap (tail) scrap fast convolution filtering in kiss_fastfir.c *) Make doc describing the overlap (tail) scrap fast convolution filtering in kiss_fastfir.c
*) Test all the ./tools/ code with fixed point (kiss_fastfir.c doesn't work, maybe others) *) Test all the ./tools/ code with fixed point (kiss_fastfir.c doesn't work, maybe others)
AUTHOR: AUTHOR:
Mark Borgerding Mark Borgerding
Mark@Borgerding.net Mark@Borgerding.net