APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Manual de usuario descargar pdf (Pagina 27)

4.2 The Edit View 27

Force

Velocity

String

Bow

Figure 11: Excitation of a string by a bow

4.2.3 The Body Module

The role of the body or soundboard of a string instrument is to radiate the vibration energy from

the strings. The body also adds a ﬁltering effect to the vibration from the string which depends on

its size and shape. In some instruments such as guitars, the body also includes an air cavity which

boosts low frequencies.

The Type selectors located at the top of the module allow one to choose be-

tween different body geometries, each of them reproducing the spectral charac-

teristics of the body of a speciﬁc type of instrument. For each type of body one

can also determine its size with the help of the Size selector from tiny T to huge

H (with small S, medium M and large L values in between). Basically, reducing

the size of the Body, shifts its frequency response toward higher frequencies

while increasing it, results in a shift toward lower frequencies. In addition to

its shape and size, the material of the body also inﬂuences its radiation and

ﬁltering effects. This behavior is adjusted with the Decay, Low Cut and High

Cut knobs. The decay time of the vibrations is controlled with the help of the

Decay knob; it is increased by turning the knob clockwise. The Low Cut and

High Cut knobs are used to set the amount of high and low frequencies respectively in the body

vibration, this amount being increased as the knob is turned clockwise.

The Mix knob is used to adjust the ratio of direct signal from the String module and the signal

ﬁltered by the Body in the output signal of the Body module. In its leftmost position the output

signal from the Body module will be that from the String module only while in its rightmost

position, there is no direct signal from the String module. When this knob is in its center position,

there is equal amounts of direct and ﬁltered signal in the output signal of the Body module.

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APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Manual de usuario Pagina 27