2 Scriptable tone detection and audio analysis
7 * Does all the dirty work using [Goertzel algorithm](http://en.wikipedia.org/wiki/Goertzel_algorithm)
8 * Detect specified tones and print their levels
9 * Filter tones using tresholds
10 * Eg.: Print levels only when treshold is crossed (=event detection)
14 * Sample scripts using goertzel.c
15 * **dtmf.sh**: decodes DTMF signals in audio
16 * **histogram.pl**: shows goertzel output in ASCII graphs
17 * **histogram.sh**: example using histogram.pl to draw realtime equalizer
18 * **sleepmon.sh**: Generates frequency on soundcard output and detects it on input
19 * Can be used to detect and log motion using soundcard and PIR sensor or NC switch
20 * **sleepplot.sh**: Generates gnuplot graph from sleeplog