Universal lowpass filter released:
formatting link
This is a filter based on the code examples from CuteSDR101.pdf by Moe Wheatley.
It reads from stdin and writes to stdout. That makes it pretty universal, command line arguments set the frequency, gain, sample rate, etc..
To compile: gcc -o ilpfilter ilpfilter.c -lm
Type: ilpfilter -h for help
Use for example like this: cat infile.wav | ./ilpfilter -y 100 -n 500 > filtered_file.wave Gives you the boom boom only :-)