APPLIED ACOUSTICS SYSTEMS ULTRA ANALOG Manual de usuario descargar pdf (Pagina 39)

4.5 The Noise Generator Module 39

position notes depending on their pitch, low notes to the left and high notes to the right where the

middle C is the reference note positioned at the location determined by the Pan knob.

4.5 The Noise Generator Module

The Noise module generates white noise and is followed by a -6dB/Oct low-pass

ﬁlter used to adjust the frequency content of the noise. The Color knob is used to

vary the cutoff frequency of the built-in low-pass ﬁlter. Turning this knob to the right

increases this frequency and therefore increases the high frequency content of the noise

until, in its rightmost position, the ﬁlter is fully opened. The F1/F2 knob controls

the amount of noise sent to the Filter 1 and Filter 2 modules. In its center position,

the same signal will be sent to both ﬁlters. Moving the knob counter-clockwise or

clockwise will send a greater amount of noise to either the Filter 1 or Filter 2 modules

respectively until when in its leftmost or rightmost position, signal is only sent to one

of the ﬁlters. Finally, the Level knob is used to adjust the overall level of the noise signal.

4.6 The LFO Module

The LFO module is used as a modulation source for the Oscil-

lator, Filter and Ampliﬁer modules. On the LFO module, one can

adjust the waveform, the phase of the signal and fade-in behavior.

4.6.1 Wave Shape

The waveform of the LFO is selected with the Shape drop-down

menu. The possible values are Sine for sinus, Tri for triangular, Rect

for rectangular and Rdm1 and Rdm2 for the two random modes. In

the case of the triangular and rectangular waves, the PW (Pulse Width) knob is used to control the

symmetry of the wave. This allows you to go from a pulse to a square wave when a rectangular

waveform is selected, and from a saw-tooth to a perfectly triangular wave when the triangular

waveform is selected. Note that the PW knob has no effect on the Sine, Rdm1 and Rdm2 waveforms.

When the Shape control is set to Rdm1, the LFO outputs random values at the rate determined by

the Sync control or the Rate knob. In this case, the output value from the LFO remains constant until

a new random value is introduced. The Rdm2 mode reacts almost like the preceding mode except

that the LFO module ramps up or down between successive random values instead of switching

instantly to the new value.

4.6.2 Rate

There are two ways to adjust the rate, or frequency, of the output of the LFO module. If the Sync

control is in its off position, the rate is set with the Rate knob. When the Sync control is on, the

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APPLIED ACOUSTICS SYSTEMS ULTRA ANALOG Manual de usuario Pagina 39