In article <kn2748$7r8$
1...@dont-email.me>, Paul <
Quill...@gmail.com> wrote:
>
> Yes, that's true. The closer you are to 100% FM modulation, the
>farther your reception will go, so it pays off to reduce the peak to
>average ratio of your audio signal.
Not really. There is a paper in the JAES from about three years ago to that
effect.
Basically, it does not affect the range of full FM quieting at all. What
it DOES do is make the signal more listenable in fringe areas where you
have dropped out of full FM quieting. So it increases your listening radius
by a little bit, but not a tremendous amount in most terrains.
What it mostly does is stand out on the dial... people have a tendency to
stop on the loudest station they pass by and when the average listener is
only hanging around for one song or so this is very important.
Let me point out that the Optimod-FM is not an offender; you really cannot
be very abusive with it before it falls apart. Orban innovated a lot of
tools that make for loudness without artifacts, like doing the processing
after the pre-emphasis to prevent filter overshoot, and he included a lot
of other older tools designed for loudness without artifacts like phase
rotation.
Major market stations and stations that want to be abusively loud avoid
the Optimods, and go with far more aggressive processing today. The Optimod
is more likely the tool for stations that are interested in quality audio
at the expense of extreme loudness.
> So don't worry, the radio stations will do their own "mastering"
>anyways!
Sort of. One of the big parts of the processing chain is to add a station's
characteristic sound to all the records and make them all sound more similar.
This got to extremes back in the seventies; I used to work at a top-40 AM
station that used a Fisher Spacexpander spring reverb in the air chain. These
days this isn't quite as important to the typical PD; a lot of larger stations
don't really care about uniformity or having a "sound" so much as sheer
loudness because their only goal is to capture a listener for a few minutes
as they pass by.