General Effect Descriptions; Reverb - E-Mu XL-7 Command Station Owner's Manual

General Effect
Descriptions

Reverb

284 E-MU Systems
Reverberation is a simulation of a natural space such as a room or hall. The
reverb algorithms in XL-7 simulate various halls, rooms and reverberation
plates. In addition, there are several other reverb effects such as Gated
Reverbs, Multi Tap (early reflections), Delay and Panning effects. There are
two adjustable parameters on the reverb effects - Decay Time and High
Frequency Damping.
Decay time defines the time it takes for the reflected sound from the room
to decay or die away. The diagram below shows a generalized reverberation
envelope.
Pre
Delay
After an initial pre-delay period, the echoes from the closest walls or ceiling
are heard. These first echoes, or the early reflection cluster, vary greatly
depending on the type of room. Roughly 20 milliseconds after the early
reflection cluster, the actual reverberation begins and decays according to
the time set by the Decay Time parameter.
High frequency energy tends to fade away first as a sound is dissipated in a
room. The High Frequency Damping parameter allows you adjust the
amount of high frequency damping and thus change the characteristics of
the room. Rooms with smooth, hard surfaces are more reflective and have
less high frequency damping. Rooms filled with sound absorbing materials
such as curtains or people have more high frequency damping.
General Descriptions of the Reverb Types
Room: Programs simulate small rooms with high frequency absorption
caused by drapes and furniture.
Plates: Simulates plate type reverbs with their tight, dense, early
reflections and sharp reverb buildup.
Hall: Presets recreate the open, spacious ambience of large concert halls.
Gated Reverbs: Add ambience only while the original signal is still
sounding. As soon as the signal falls below a threshold, reverb is cut off.
Delay: Programs can be used to create echo and doubling effects.
Multi Tap: Programs consist of the reflection cluster only without the
reverb decay.
Reflex Reverb
Cluster
TIME
Decay Time
Effects

General Effect Descriptions