Roland VS-880EX Application Manual page 128

Equalizer
An electronic device that will amplify (boost) and/or
attenuate (cut) certain portions of the audio
frequency spectrum. There are many different types
of equalizers.
Fixed Frequency
An equalizer which operates at one or more
specific frequencies which can be boosted or
attenuated.
Graphic
An equalizer which operates simultaneously at a
number of preset frequencies, any of which may
be boosted or cut independently of the others.
Often done at standard 1, 1/2, 1/3, or 1/6 octave
center frequencies. Graphic equalizers are
usually peaking-type equalizers.
Paragraphic
A graphic equalizer where the center frequency
of each band is adjustable. May also have
adjustable "Q." A combination of "parametric"
and "graphic."
Parametric
An equalizer where the center frequency is
continuously variable over a given frequency
range, and where the "Q" (slope rate) is
adjustable. If "Q" is nonadjustable, the EQ is
"Quasi-parametric," "Tunable" or "Sweepable."
Peaking
A boost or cut characteristic which has a bell-
shaped response (the shape of the "bell"
determines the "Q" of the equalizer). Maximum
boost or cut occurs at the center frequency, and
there is less effect at frequencies farther away,
above or below the center frequency.
S h e l v i n g
A boost or cut characteristic which has a
response curve resembling a shelf. Maximum
boost or cut occurs at the indicated frequency
and remains constant at all points beyond that
frequency.
Sweepable
An equalizer where the center frequency is
continuously variable over a given frequency
range, but the "Q" is not variable.
Three Band
An equalizer where three separate frequency
ranges can be boosted or cut simultaneously;
usually divided into high, mid, and low
frequency ranges. Also called "3-knob EQ."
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VS-880EX Application Guide
Two Band
An equalizer where two separate frequency
ranges can be boosted or cut simultaneously;
usually divided into high and low frequency
ranges. Also called "2-knob EQ."
Fade In
An inverse fade where the signal is increased from
zero to the desired level.
Fade Out
A fade that starts with full signal level and goes to
inaudibility.
Fader
A potentiometer that controls the signal level for a
console input position or output channel. May be a
rotary or linear (straight line) control.
F i l t e r
A device which attenuates certain portions of the
audio frequency spectrum.
A n t i - A l i a s i n g
A low pass (high-cut) filter used in digital audio
equipment to prevent aliasing. Usually has a
very steep cut-off rate such as 36 dB or 48 dB per
octave.
Band Pass
A filter which has high frequency and low
frequency cut-off points, and which only passes
signals between these two points.
High Pass
A filter which will only pass frequencies above a
certain cut-off frequency point (also known as
low-cut filter).
Low Pass
A filter which will only pass frequencies below a
certain cut-off frequency point (also known as
high-cut filter).
Notch
A filter which attenuates a very narrow portion
of the frequency spectrum, but will pass signals
on either side.
F l a n g e r
A special effects device used to create "flanging."
Flanging is an effect originally created by careful
manipulation of two tape machines that recorded
and played the same signal, relying on phase errors
to create a comb filter ( a series of harmonically
related notches in the response). Hence the term "reel
flanging." Today flanging is commonly done with
electronic signal processing devices that do not
require tape and can operate in real time.