ENSONIQ DP/4 Musician's Manual page 206

Glossary
Rumble Filter An algorithm that attenuates very low frequencies. In the DP / 4, the Rumble Filter is
created by cascading four first order high pass filters. Originally conceived to eliminate
noise in turntables.
Sample and Hold A device that captures a signal and stores it for brief periods of time. The new signal
can be modulated and processed to create interesting sonic effects.
Unbalanced Jack An input jack that has two wires. One carries the positive
(+)
signal, the other the
Unit
negative (-) signal and is attached to the ground. These two signals are electrically
unbalanced.
The four independent effects processors in the DP / 4 are called Units, and are referred to
as A, B, C, and D. Normally, each of the four Units is loaded with a different algorithm,
but in some cases multiple units are combined to create one complex multi-unit effect,
such as the vocoder.
Van Der Pol Filter An algorithm that adds synthetic high harmonics to the input signal, usually
brightening the sound. Van Der Pol originally developed the theory for this
mathematical model in his study of oscillations caused by the non-linearities in vacuum
tube circuits. To our knowledge, this is the first implementation of this science in a
digital effects processor.
VCF-Distortion Voltage Controlled Filter and distortion. Useful for creating Distortion, Wah Wah,
Vocoder
xx
and Auto Wah effects.
A device or algorithm that analyzes the frequency spectrum from an incoming source
(e.g. speech) and applies that analysis to the sounds of another source,like a
sampler/keyboard. Typical examples include: talking orchestra, vocal electronic
percussion. The DP / 4 uses 12 bandpass filters to perform the analysis (3 per unit).
ENSONIQ
DP/4
Musician's Manual
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