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A Home Made Electronics Question; How Do I Make a Gadget That Allows for Tonal Recognition?

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Question by O.G.: a home made electronics question; How do I make a gadget that allows for tonal recognition?
In the pursuit of intellectual curiosity I have been exploring how to make a number of gadgets. I want my next gadget to do this: Recognize one or multiple specific tones and connect different circuits depending upon the tone heard.
Does anybody know a good site to find easy guides? Or perhaps some suggestions of a common object that I can take and modify to make it do what I want?
Thanks

Best answer:

Answer by billrussell42
look up audio filters.

you need a mike and an amplifier to convert the sound to a voltage. Then several audio bandpass filters to separate the different tones to different parts of the circuit. The output of the filters can each go to a diode detector and an opamp, and to a relay to do whatever you want to do with it.

You will need a audio signal generator and oscilloscope to get the filters working correctly.

I'd do it a little bit at a time. Perhaps one filter first, then the mike and amplifier.

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