Operation Manual

6.91 Tube4 150
6.91 Tube4
The Tube4 module simulates sound propagation in a resonator made from 4 tubes
of variable lengths and radii connected in series as shown in Figure 92. The input
signal, or source, is assumed to be localized at the extremity of the first tube while
the output, or listening point, is placed at the extremity of the fourth tube.
The discontinuities in the resonator scatter acoustic energy at these points and
thereby create different standing wave patterns in the different sections of the res-
onator. This results in a complex filtering effect that varies according to the relative
lengths and radii of the different tubes. The decay knob controls the decay time of
sound wave traveling inside the resonator.
l1
l2
l3
2r3
2r4 2r2 2r1
l4
source position
mic position
Figure 92: Tube4 module geometry.
Typical Use
Tube4 modules can be used to obtain reverb effects. When the total length of the tube is long, the
module will introduce delay in the patch. The discontinuities in the resonator filter the input signal
depending on their relative lengths and radii. In the example of Figure 93, under reverb, a Tube4
module is used in combination with two Reverb modules in order to make a stereo reverb. The
Reverb modules produce early reflections in a room while the Tube4 module produces the late
reflections.
The default values of the following parameters are set at construction
• length: length, in meters, of the 4 tubes (between 0.01 and 1000m).
• radius: radius, in meters, of the 4 tubes (between 0.001 and 1 m).