ESI ESI2000, Руководство по эксплуатации

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Appendix
227
Reverb
Reverberation is a simulation of a natural space such as a room or hall.
The reverb effects 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 is the time it takes for the reflected sound from the room to
decay or die away. The diagram below shows a generalized reverberation
envelope.
TIME
AMPLITUDE
Pre
Delay Reverb Reflex
Cluster
Decay Time
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 character-
istics of the room. Rooms with smooth, hard surfaces are more reflective
and have less high frequency damping. Rooms filled with sound absorb-
ing materials such as curtains or people have more high frequency
damping.
General Descriptions
Room programs simulate small rooms with high frequency
absorption caused by drapes and furniture.
Plates simulate plate type reverbs with their tight, dense early
reflections and sharp reverb buildup.
Hall programs 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, the reverb is
automatically 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.