3-2
Algorithms and Parameters
Lexicon
The PCM 91 uses 15 algorithms to create different types of
reverberation effects. Each of these algorithms and its associated
parameters are described in detail in this section.
When you select any effect, the bank and row label will appear on
the upper display line. The matrix location and the effect name will
appear on the lower line. Press and hold Program Banks or Register
Banks to display the algorithm from which the currently loaded
effect is derived. Press Edit to display the last edited parameter in
that algorithm's parameter matrix.
Input levels and hardwired pans determine the signal flow to left
and right pairs of delay voices, and also to the reverb effect. Some
delay voices have individually adjustable level, delay, and feedback
controls, as well as master voice controls. A High Cut parameter
provides high end rolloff. InWidth and OutWidth controls allow the
creation of spatial effects.
In this chapter, diagrams and descriptions of each algorithm are
presented first, along with pictures of each edit matrix. The
diagrams are followed by a glossary of parameter descriptions,
organized alphabetically by matrix row name. Within each matrix
row, parameters are organized as far as possible in the sequence in
which they appear in the row.
RANDOM HALL
The Random Hall algorithm gives recorded music a sense of being
performed in a real acoustic location. The Size, Spread and Shape
controls allow adjustment of the buildup and decay of the initial
part of the reverberation envelope. Shape controls the shape of the
envelope, while Spread and Size set the time over which this shape
is active.
ABOUT THE ALGORITHMS
All of the PCM 91 algorithms share the same general structure,
shown at the top of the next column. The shaded area of the
diagram is detailed in the individual effect descriptions that follow.
The algorithms also share a common set of controls and
parameters built around one or more of the five stereo reverb
effects.
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