Ashly Power Amplifiers FET-200 Manuale di istruzioni per l'uso - Pagina 12
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IMPEDANCE
Essentially
the
AC equivalent of resistance.
It
describes
the
drive
capability of an output,
or the amount of drive required for an input at
any given signal level.
KHz
Kilohertz. 1,000 Hertz.
LEVEL
The magnitude of a signal, expressed in decxoels or volts.
LIMITER
An
amplifier
which reduces its gain as its input is increased beyond
a
predetermined
threshold.
Usually used to protect audio systems
against
sudden, high level signals, and possible overload.
LIJJE LEVEL
i'leaning
somewhere around OdBV* as opposed to MIC level of around -40dBV.
MILLISECOND
1/lOOOtn of a second
MICROSECOND
1/1,000,000th of a second
OCTAVE
A
logarithmic
unit
to compare
frequencies.
+1
Octave
means
double
frequency, -1 Octave means half frequency.
OHM
The unit of electrical resistance or impedance.
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.
"Q"
A measurement describing the sharpness or broadness of a filter.
PvESONAt^CE
The
tendency
of
an
electrical or mechanical
system
to
vibrate
(or
oscillate) at a certain frequency.
SATURATION
The
point
at
which
the
magnetic storage capability
of
a
piece
of
recording tape is exceeded.
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