Few people in the record industry really know how a radio station processes its material before it hits the FM airwaves. This article`s purpose is to remove the many myths and misconceptions surrounding this arcane art. Every radio station uses a transmission audio processor in front of its transmitter. The processor`s most important function is to control the peak modulation of the transmitter to the legal requirements of the regulatory body in each station`s nation. However, very few stations use a simple peak limiter for this function. Instead, they use more complex audio chains. These can accurately constrain peak modulation while significantly decreasing the peak-to-average ratio of the audio. This makes the station sound louder within the allowable peak modulation.
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