dl-n-lb/fftify

Fun with the fft and pipes

FFT-IFY

A pipe based system for messing with the fast fourier transform. Example use below, produces the sine wave after FFTing and unFFTing it.

$ ./sine -t 2 -s 1024 | ./fft | ./fft -cgb | graph --output-format png -x 0 2000 -y -5 5 > out.png && feh out.png

fft (main.c)

takes an input from a file (--input, -i, default stdin) with the format of floats separated by new lines (or with the -c or --complex flag float float separated by new lines). Produces the fourier transform of the input and outputs it to a file (--output, -o, default stdout).

To output in a graphable format, pass --graph or -g, and use with graph from plotutils.

To get help just run the command with no arguments.

$ ./fft

!! CURRENTLY UNIMPLEMENTED: 2D transforms

sine (sine.c)

Outputs a sine wave with properties specified by the parameters passed. (--output, -o: default stdout) (--input, -i: default stdin) (--time, -t time, "time" in "seconds" for the wave to be generated over) (--frequency, -f: frequency of the wave in Hz) (--samples, -s: number of samples to generate) (--cos, -c: produce a cosine wave instead of a sine wave)

comp (comp.c)

like sine but adds to existing signal coming from a file specified with input