I am interested in identifying the instantaneous, dominant frequency in a complex audio (i.e. music) waveform (30Hz - 7000Hz) for use in a color organ project. Not wishing to pursue more accurate techniques such as FFT, I believe that simply measuring the time between successive positive-going, zero-crossings will provide the desired dominant frequency, which can then be used to generate the expected visual effect.
I would appreciate any comments on this approach, and if sound, some circuit suggestions as I have not found any suitable, single-supply designs that handle the stated audio frequency range.
I would appreciate any comments on this approach, and if sound, some circuit suggestions as I have not found any suitable, single-supply designs that handle the stated audio frequency range.