Xref: utzoo sci.electronics:4686 rec.ham-radio:7746
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From: haldane@warwick.UUCP (Steve Sykes)
Newsgroups: sci.electronics,rec.ham-radio
Subject: Re: Optimod: how does it work ?
Keywords: radio modulation
Message-ID: <890@ubu.warwick.UUCP>
Date: 9 Jan 89 00:17:17 GMT
References: <1561@kulcs.kulcs.uucp>
Sender: news@warwick.UUCP
Reply-To: haldane@uk.ac.warwick.cs (Steve Sykes)
Organization: Computer Science, Warwick University, UK
Lines: 22

In article <1561@kulcs.kulcs.uucp> marc@kulcs.uucp (Marc Van Barel) writes:
>Here in Europe, more and more radio and TV-stations are using a device
>called "Optimod" for improving sound modulation.  It's produced by an
>American company called "Orban".  Using this device, the audio signal
>seems to have more loudness.  Does anybody on the net know how this
>works ?  Is it just some smart compression/limiting of the dynamic
>range of the audio signal or is there more to it ?

Optimods are just pretty smart compressor limiters.  They have 6 band
compression and wideband limiting + filtering too.  The idea is to
get the carrier as modulated as possible for as much of the time as
possible, if you see what I mean.  Orban make a version for use on
AM (good), one for FM (bad), and for TV (don't know, but probably
ugly).  If you want an FM processor, Inovonics is a good bet.

+++++
     ljc@uk.ac.ucl.mssl.a - BBC
     haldane@uk.ac.warwick.cs - Mercia Sound
UUCP:   ...!mcvax!ukc!warwick!haldane       |    Have you hugged your
JANET:  haldane@uk.ac.warwick.cs            |        radio today?
ARPA:   haldane@cs.warwick.ac.uk            |_____________________________
Steve Sykes, Computing Dept, Warwick University, Coventry CV4 7AL, England