Glossary
VIII ENSONIQ DP/4+ Reference Manual
Q Another term for resonance. In the DP/4+, this is a bandwidth control that determines
the width of the resonant peak at the center of the frequency band. This is equal to the
cutoff frequency divided by the bandwidth. By raising the Q, you can produce a
narrower bandwidth.
Regeneration A signal routing in which some of the output is mixed back into the input. The feedback
of a delay line is also called regeneration.
Reverb Multiple echoes and reflections that combine to create an ambient effect. Different
devices have been used to simulate these ambiences: springs, plates, tubes, and
chambers. The DP/4+ uses digital algorithms to create new environments and simulate
these classic ambiences.
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 A device that captures a signal and stores it for brief periods of time. In the DP/4+,
Hold Sample and Hold is often available on the output of the LFO in modulation-type effects,
allowing smoothly-swept effects to sweep in a random, chaotic manner, creating
interesting sonic effects.
Source Config In Edit mode, this is the Config parameter which controls how many input signals are to
be processed by the DP/4+ (equivalent to Input Config).
Transient A signal that is very short, like the attack of a pick on a guitar string, or the sound of a
drumstick hitting a rim. These “transients” are difficult to reproduce, and the ability of a
device to respond to these sounds is called the “transient response.”
Unbalanced An input jack that has two wires. One carries the positive (+) signal, the other the
Jack negative (-) signal and is attached to the ground.
Unit 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 An algorithm that adds synthetic high harmonics to the input signal, usually brightening
Filter 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.
VCF-Distortion Voltage Controlled Filter and distortion. Useful for creating Distortion, Wah Wah, and
Envelope (Auto) Wah effects.
Vocoder 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: robot voice, talking orchestra, vocal
electronic percussion.
XLR A type of connector that has three pins. Pin 1 is the ground reference, pin 2 carries the
Connector “hot” signal, and pin 3 carries the anti-phase “cold” signal. It is designed to mate with
balanced inputs and outputs.
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