APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Bedienungsanleitung PDF herunterladen (Seite 49)

4.3 The FX View 49

Direct Sound Room Response

Early reflexions Late Reverberation

Reverberation Time (TR)

Amp

Time

Figure 31: Impulse response of a room.

Adjusting the room effect

The size of a room strongly affects the reverberation effect. The Size selector is used to choose be-

tween the Studio, Club, Hall and Large Hall settings each reproducing spaces of different volumes

from smaller to larger.

The duration of the reverberation time depends on both the size of the room and the absorption

of the walls, which is controlled with the Decay knob. In a real room the reverberation time is not

constant over the whole frequency range. As the walls are often more absorbent in the very low and

in the high frequencies the reverberation time is shorter for these frequencies. These parameters

are adjusted with the Low and High knobs respectively.

Another parameter which affects the response of a room is its geometry; the more complex

the geometry of a room, the more reﬂexion are observed per unit of time. This quantity is known

as the time density and can be set trough the Diffusion knob. In a concert hall, the time density

is supposed to be quite high in order not to hear separate echoes which are characteristic of poor

sounding rooms.

The last parameter which affects our listening experience in a room, is the distance between

the sound source and the listener. While the room response is quite constant regardless of the

position of the source and the listener, the direct sound (the sound which comes directly from the

source) depends strongly on the position of the listener. The farther we are from the sound source

the quieter is the direct sound relatively to the room response. The ratio between the direct sound

and the room response is adjusted with the Mix knob which in other words is used to adjust the

perceived distance between the source and the listener. In its leftmost position, only the direct

sound is heard while when fully turned to the right, one only hears the room response. Note that

the Mix parameter is also adjustable from the Play view.

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APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Bedienungsanleitung Seite 49