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Topic: old style jutboxes that flashed lights to the beat of the music (Read 529 times) previous topic - next topic

Remember the old style jutboxes that flashed lights to the beat of the music. What type of device is this? I would like a series of multi colored LED's to strobe and flash based on the beat and tempo of the music. I would like to build a device that has a microphone that is the input of the audio, verses a direct feed for an audio port.

Magician

They call device light organ or color organ:
http://en.wikipedia.org/wiki/Light_organ


They way a light organ usually works is by using analog low, ban and high pass filters to isolate signal frequencies to trigger specific lights.  Unless you used such filters on your audio signal prior to entering the ADC on the uC you will need to do this audio separation in software.  The software technique to do this is call a discrete fourier transform (DFT) or its faster cousin the fast fourier transform (FFT). 

It looks like someone has already done something like what you thinking about here:

http://www.youtube.com/watch?v=dahj51CMixA

Jacob

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