AVR-Chat

White noise has all frequencies and a freq resp that rises at 3db per octave. So I'd try a one octave filter at 80Hz and a one octave filter at 10KHz which is 7 octaves higher and check and see if the hi freq is 21db above the lo freq. Music usually rolls off at the higher frequencies.







-----Original Message-----
From: enkitec <enkitec@gmail.com>
To: AVR-Chat <AVR-Chat@yahoogroups.com>
Sent: Sun, Jun 24, 2012 1:19 pm
Subject: [AVR-Chat] White noise detection?


     Hi,
     I want to build a FM radio squelch using an ATMEGA8.
    The ADC will be sampling the FM radio audio output and turn on a 
ED when there is only noise present. The LED will be off when someone 
s using the channel (no noise, just voice).
     What is the best way of doing this in software?
     Thanks for any idea.
    Mark Jordan


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