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Specifications for modules
6.70
Reverberator
The Reverberator module is used to recreate the effect of the
reflexion of sound on the walls of a room or a hall. These reflex-
ions add spaciousness to the sound and make it warmer, deeper,
and more “real”. This makes sense as we always listen to instru-
ments in a room and thus with a room effect. This module has
two inputs, the left and right source signals and its two outputs
are these signals as they would be heard in a given room.
Impulse Response of a Room
The best way to evaluate the response of a room is to clap hands
and to listen to the resulting sound. Figure 67 shows the amplitude
of the impulse response of a room versus time. The first part of the response is the clap itself, the
direct sound, while the remaining of the response is the effect of the room which can itself be
divided in two parts. Following the direct sound, one can observe a certain amount of echoes
which gradually become closer and closer until they can not be distinguished anymore and can be
assimilated to an exponentially decaying signal. The first part of the room response is called the
early reflexion while the second is called the late reverberation. The total duration of the room
response is called the reverberation time (TR).
Direct Sound
Room Response
Early reflexions
Late Reverberation
dB
Reverberation Time (TR)
Amp
Time
Figure 67: Impulse response of a room.
Adjusting the room effect
The size of a room strongly affects the reverberation effect. The size button is used to choose this
size from small (1) to large hall (4). The duration of the reverberation time (TR) depends on both
the size of the room and the absorption of the walls, which can be adjusted with the decay knob. In
Summary of Contents for TASSMAN
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