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From: rbl@nitrex.UUCP
Newsgroups: sci.electronics
Subject: Re: Volume based on ambient noise
Message-ID: <468@nitrex.UUCP>
Date: Mon, 1-Jun-87 09:02:47 EDT
Article-I.D.: nitrex.468
Posted: Mon Jun  1 09:02:47 1987
Date-Received: Thu, 4-Jun-87 07:19:28 EDT
References: <6412@reed.UUCP> <90@dalcsug.UUCP>
Reply-To: rbl@nitrex.UUCP ( Dr. Robin Lake )
Distribution: na
Organization: The Standard Oil Co., Cleveland
Lines: 16
Summary: Perhaps Ford did it first?

In article <90@dalcsug.UUCP> cslug2@dalcsug.UUCP (me) writes:
>In article <6412@reed.UUCP>, omsi@reed.UUCP (OMSI) writes:
>> 
>> I have an application where it would be useful to boost the volume through
>> a speaker based on the level of background noise in the area.  
>
>> ...
>ELECTOR magazine (UK publication) had a motorcycle intercom a while back
>using that idea. 
> ...

MANY years ago, Ford had a radio option (I believe for the Thunderbird) that
adjusted the volume per the vehicle speed.  As I recall, there was a pulse
from the distributor or tachometer.  This was probably in the late '60's.

Rob Lake