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2.0 OPERATIONAL CHARACTERISTICS
The COMPELLOR is a unique combination of Compressor, Leveler, and
Peak Limiter. All COMPELLOR models (300, 301, 303) have three detector
circuits that feed a single gain control device per channel in a very simple,
high-quality audio path of extraordinary transparency, as shown in the block
diagrams in Fig. 2-1, Fig. 2-2 ( next page), and Fig. 2-3 ( page 2-7).
The compression and leveling sidechains are " intelligent," being program-
controlled and interactive. The result is a very simple, easy- to-use device
that is free of the sonic pumping, breathing, noise build-up, popping and
hole punching.
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Fig. 2-1. Block Diagram of COMPELLOR Model 300 circuits.
Only one
channel is shown.
These functions are designed to work together, using feedback techniques
(reading the output of the VCA) for extremely low distortion and accurate
operation. The leveler provides a "platform" based on long-term average
levels. In the Model 300, the two Leveling Sidechains are linked together so
that the channel with the highest amount of leveling determines the amount
of leveling in the other channel. This maintains a stable stereo platform for
long-term imbalances.
The compressor, working from this "platform," has to do less gain reduction,
and can more easily handle short-term level changes. A PROCESS BAL-
ANCE control varies the ratio of compression to leveling. The high-speed
(1 tis) limiter catches any dynamic overshoots and ensures peak protection.
The limiter also allows the compressor action to remain slow enough to
maintain natural transient qualities in the audio.
Operational Characteristics 2-1
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