Great question.

You're asking something that every radio listener is able to detect but never thinks through to the point of looking into it.

First of all..there IS a difference.

It is called PROCESSING.

FM stations utilize compression. This allows the audio level to standardize when it's heard on the radio. Essentially...an announcer can with a properly tuned output...overmodulate into the mic but the 'limiters' will prevent what would otherwise be distortion.

FM stations also use something called an Optimod.

This little gizmo is used in the audio chain to tweak highs and lows as well.

Notice I said audio chain.

When a jock is on the board (at the controls) of any FM radio station...he can listen to what he's putting out over the air in two formats.

Program and Air.

Program is the basic flat audio produced through the board BEFORE the audio chain gets it and processes it.

Air is the processed product that the listener hears AFTER it comes through the audio chain.

Stations have done unique things over the year in an attempt to rol-off a distinctive sound.

When I worked at KPLZ in Seattle back in the early 80's...each jock was given a processing box for his voice when he went on shift. The black box fit in the palm of your hand and went directly into the board...which served to alter your voice to the overall audio chain's output.

Thanks John. Hope the answer makes sense.

Bob

• RE: FM Sound Quality - John 05/12/2008 14:11:56 EDT (0)
• RE: FM Sound Quality ++ - John 05/13/2008 13:10:47 EDT (1)