30
NOISE
(Continued)
The Noise generator produces three different colors of noise – White, Red, and Purple. Any two
noise colors can be selected at once using the
COLOR
button; the
COLOR MIX
knob creates a blend
between those two noise colors.
COLOR MIX
The
COLOR MIX
knob sets the balance between the two colors of noise
selected by the
COLOR
button. Rotating the knob fully to the left will
emphasize the color listed in the left column. Rotating the knob fully to
the right will emphasize the color listed in the right column. Placing the
knob in the center position will provide an even mix between the two.
COLOR
The
COLOR
button specifies which two colors of noise are being
blended using the
COLOR MIX
knob - the corresponding LED will light
for each selected pair.
RED
+
WHITE
Red Noise and White Noise are selected.
RED
+
PURPLE
Red Noise and Purple Noise are selected.
WHITE
+
PURPLE
White Noise and Purple Noise are selected.
WHITE NOISE
White Noise is analogous to white light; it contains the same amount of energy across every octave band
in the audio spectrum. It’s the sound you hear when an old television is set to a non-existing channel.
RED NOISE
Also referred to as Brownian Noise, Red Noise provides a 6 dB decrease in energy per octave across
the audio spectrum as the frequency increases. This greatly curtails the high-frequency Noise
components. Red Noise can be thought of as a “rumble” type of Noise.
PURPLE NOISE
Sometimes called Violet Noise, Purple Noise is the counterpart to Red Noise. Purple Noise provides a
6 dB increase in energy per octave across the audio spectrum as the frequency increases. This greatly
reduces the low-frequency Noise components. Purple Noise can be thought of as a “hiss” type of Noise.
NOTE:
Pink Noise – a popular element in modular and percussion synthesis – can be approximated by
using the
COLOR
button to select
RED
+
WHITE
, and by then adjusting the
COLOR MIX
knob to taste.
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