c/goertzel/guitar-tuner.sh

   1 #!/bin/sh
   2 #Example of guitar tuner using goertzel:
   3 #165Hz = Low E
   4 #How to tune:
   5 #There are 3 frequencies, you have to make the middle one (target frequency) most loud
   6 #and the other two surrounding it shoud show approximately same intensity
   7
   8 arecord -r 44100 | ./goertzel -r 44100 -f 150 -f 165 -f 180 | ./histogram.pl