Manual AAS Tassman 4 (page 77 of 177) (English)

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6.12 Bowed Multimode 77

• Width: the width, in meters, of the membrane.

• Frequency: fundamental frequency, in Hertz, of the membrane when there is no pitch mod-

ulation signal or when its value is equal to 0. Note that the fundamental frequency is in-

dependent of the size of the membrane. The software automatically calculates the physical

parameters necessary to obtain the required fundamental frequency. The default value of

this parameter is 261.62 Hz which corresponds to the middle C (C3) of a piano keyboard.

This setting is convenient when controlling a Bowed Membrane module with a Keyboard

module.

• Decay: proportional to the decay time of the sound produced by the membrane.

• Number of Modes: number of modes used to simulate the object. As the number of modes

is increased, the number of partials in the sound increases but also inevitably the calculation

load.

• Excitation point-x: x-coordinate, in meters, of bow from the lower left corner of the mem-

brane.

• Excitation point-y: y-coordinate, in meters, of bow from the lower left corner of the mem-

brane.

• Listening point-x: x-coordinate, in meters, of listening point from the lower left corner of the

membrane. To obtain proper functioning, the excitation and listening points should be the

same.

• Listening point-y: y-coordinate, in meters, of listening point from the lower left corner of the

membrane. To obtain proper functioning, the excitation and listening points should be the

same.

Note: For more details on this module and especially the front panel controls, see the Bowed

Multimode module.

6.12 Bowed Multimode

The Bowed Multimode module is used by the Tassman to simulate mechanical objects such as

strings, plates, beams and membranes that are excited as a result of the interaction with a bow. The

output of this module is the acoustic signal that would be produced when these objects are bowed

and given a certain geometry, material, listening point and damping. The functioning of this module

is based on modal analysis. This technique is well-known in areas of physics and mechanics and is

used to describe complex vibrational motion using modes. Modes are just elementary oscillation

patterns that can be used to decompose a complex motion. By adding together modes having

different frequencies, amplitudes and damping, one can reproduce the behavior of different type

of structures. The accuracy of the resulting signal depends on the number of modes used in the

simulation.

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AAS Tassman 4 Manual

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