Introduction - Aphex COMPELLOR 300 Operating Manual

1.0 INTRODUCTION
Multipurpose processor...
Three Models available...
The Aphex COMPELLOR e' is a multipurpose audio processor designed to
give nearly inaudible control of short- and long-term average program
dynamic range. In contrast to the Aphex DOMINATOR Tm, which is a true
"Peak Limiter", the COMPELLOR maintains a well-controlled "average"
audio level. One way to describe this is that the program floor is "lifted", so
quiet signals become more audible, while excessively loud signals are
reduced in level. The COMPELLOR provides simple adjustments to set the
extent of control.
The COMPELLOR is perfectly compatible with the DOMINATOR, and the
two are often used together when both the average and the precise peak
audio levels need to be tightly controlled, such as in broadcasting.
In the COMPELLOR, the functions of compression, leveling, and limiting are
interwoven with an intelligent control system to maintain all functions
simultaneously. The various dynamic attributes of an audio signal are
managed using program-dependent processing to minimize the audibility of
the COMPELLOR doing its job. This means the "squeezing" or "pumping"
effects commonly attributed to signal compressors are absent with the
COMPELLOR, even when a large amount of control is used. The main
attribute of the COMPELLOR, then, is that it is "invisible" in the audio
system - you will not detect its presence.
The COMPELLOR is available in several different models to suit a wide
range of audio systems. The Model 300 version is a stereo unit designed
especially for stereo applications like broadcasting or recording. This model
can also be used for a single-channel system, but is not designed to be used
as two independent processors. The Model 301 is a single-channel unit
which is more economical in monaural signal applications. Two Model 301's
can easily be linked for stereo operation using a simple patch cord, making
this model especially useful in studios. The Model 303 COMPELLOR is a
single channel unit similar to the Model 301, containing a built-in, fully-
adjustable Aphex AURAL EXCITER•circuit. This model is especially useful
for P. A. work and speech processing.
Typical applications for the COMPELLOR are:
• Radio, Cable, and TV Broadcasting
• Paging Systems
• P. A. Systems
• Tape Duplication
• Announcer Control
• SCA Programming
• Back- and Foreground Music Systems
• Satellite Up-Link
• Stage Monitors
• Live Recording
• Studio Vocal and Instrument Tracking
• Analog and Digital Disk Mastering
Introduction 1-1