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Author Topic: I need some help, can someone tell me how to make a sound recognizer  (Read 1741 times)

Offline conker

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I need some help, can someone tell me how to make a sound recognizer
« on: April 07, 2009, 06:51:38 AM »
i need some thing that will recognize a sound being played either through a mic or directly pugged in to an audio port
it needs to recognize about three different frequencys
when it recognizes one i need it to complete a different circuit for each
it needs to be portable with nothing LESS THAN 3.6v powering it
thanks for any info if you want to know why i need it check out my psp bluetooth mod
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Offline HYOSC1NE

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Re: I need some help, can someone tell me how to make a sound recognizer
« Reply #1 on: April 14, 2009, 01:57:44 PM »
Sorry but wtf are you talking about. I dont see what are you trying to mean by a sound recognizer. Seems to me that you mean a equilizer by talking about frequencys. But a sound recognizer like a voice recognizer is somthing totally diferent, u see voice is not FM rather AM so it doesnt makes any sence to me what you want. I advice you to explain more about the aplication itself rather than just talking about things that you might not know. Maybe what you want is a filter, but then again wtf...
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Offline 802Chives

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Re: I need some help, can someone tell me how to make a sound recognizer
« Reply #2 on: April 21, 2009, 10:57:39 AM »
hahaha, I know what ur talking about :laughing: I did a project in college where I had to recognize a smoke detector sound (4khz) in order to start an autonomous robot electrically.

http://www.national.com/mpf/LM/LM2917.html This is a frequency to voltage conversion IC.  essentially you can get it to output a voltage that is in reference to the frequency it is "seeing".  you can put a couple bandpass filters on the input, that only pass certain frequencies to avoid false readings. Then by using a couple of comparators on the output, they would be able to run a transistor/mosfet in order to complete the respective circuit once the correct threshold voltage is outputed by the LM2917.

Do you have any formal education with electronix?  If you are a hobby level electrician, and the description above doesnt scare you, probably we could get you up and running, but it will require some work, espeacially on ur end.
« Last Edit: April 21, 2009, 10:59:30 AM by 802Chives »
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Offline geekonaut

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Re: I need some help, can someone tell me how to make a sound recognizer
« Reply #3 on: July 09, 2009, 07:34:06 PM »
If you have some flexibility in the frequencies you need to detect, you can use DTMF. There's a million DTMF projects out there.
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