Operation Manual

6.70 Reverberator 131

often more absorbent in the very low and in the high frequencies the reverberation time is shorter

for these frequencies. This can be adjusted in the Reverberator module with the low and high

decay knobs. 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 all 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.

One important feature taken into account by the Reverberator module is the difference be-

tween the signal reaching the left and right ear. In the ﬁrst part of the response, the echoes are

panned right and left from the position of the source in the stereo space helping to create the sensa-

tion of space and in the second part of the response (the late reverberation) the signals from the left

and right channel are uncorrelated which is an important property of the “diffused ﬁeld” observed

in real rooms.

Typical Use

In Figure 75, a panpot is used to position a mono signal in the stereo space before adding a room

effect with a Reverberator module.

Figure 75: Adding a room effect to a mono signal.

Note: A Reverberator is included in the output stage effect stage as explained in Section 4.8.