From: Jim Thompson
Subject: Re: How to detect the beat of a song using electronics?
X-Newsreader: Forte Agent 1.91/32.564
Date: Wed, 09 Oct 2002 01:59:18 GMT
NNTP-Posting-Date: Tue, 08 Oct 2002 21:59:18 EDT
Organization: Cox Communications
On 8 Oct 2002 18:14:30 -0700,
email@example.com (Alex Bryant),
In Newsgroup: sci.electronics.design,
Entitled: "How to detect the beat of a song using electronics?",
Wrote the following:
|I am using an OOPic microcontroller to drive 5 servos and would like
|their behavior to be coordinated by the detection of low frequency
|sounds....specifically, the bass beat of a song. Anyone have any
|suggestions on how to get a relay to close whenever a low bass beat is
|'heard' by a microphone?
Low pass filter,followed by full-wave rectification, followed by a
peak detector will give you the "envelope" or "beat". I don't know
about driving a relay... I've generally used a Triac.
Somewhere in my archives I have a color organ design which set colors
by octave filters and flashed them to the beat... from my disco phase
;-) I'll look for it.
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
For proper E-mail replies SWAP "-" and "_"
I love to cook with wine. Sometimes I even put it in the food.