Ashly Electronic Amplifier none User Manual
Page 35
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LINE LEVEL
Meaning "somewhere around OdBV" as opposed to MIC level of around -40dBV.
OCTAVE
A
logarithmic
unit
to
compare
frequencies,
frequency, -1 Octave means half frequency.
+1 Octave means double
OHM
The unit of electrical resistance or impedance.
ORDER
A term describing the slope of a filter. A first order filter will have
a slope of 6dB/octave, second-order will be 12dB/octve, third-order will
be
18dB/octave,
fourth-order
will
be
24dB/octave,
and
so
on.
Higher
order
filters
are
typically
made
by
cascading
lower-order
filter
sections.
PHASE
Describes how well two signals are in step. In-phase means that positive
and
negative
peaks
in
two
signals
occur
together,
while
out-of-phase
means they do not occur together. Variations in signal timing as well as
polarity can make two signals in or out of phase, or anywhere in between.
Phase is usually measured in degrees where 0 degrees is in-phase, 180
degrees is out-of-phase, and 90 degrees is in between (sometimes called
quadrature).
PREAMPLIFIER
The
first
stage
of
amplification,
designed
to
boost
very
low
level
signals to line level.
A measurement describing the sharpness or broadness of a filter.
RESONANCE
The
tendency
of
an
electrical
or
mechanical
system
to
vibrate
(or
oscillate) at a certain frequency.
SHELVING
SLOPE
Describes an equalization action where all frequencies above or below a
particular frequency are boost or cut.
In
a
filter
or
equalizer,
a
description
of
the
rate
of
boost
or
attenuation. Normally specified in dB/octave (6, 12, 18, or 24dB/octave
slopes are most common). The steeper the slope, the higher the "Q" in a
filter.
TRANSIENT
A sudden burst of energy in an audio signal, such as a breath blast in a
microphone, the sound of a snare drum, or a deep scratch in a record.
Transients frequently reach peak levels of 10 to 30 dB above standard
operating level, and may cause distortion or even damage to equipment.
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