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Ashly Power Amplifiers FET-200 にも： 取扱説明書 (15 ページ)
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DEFINITION OF TERMS AS USED IN THIS MANUAL
ACTIVE
ectronic circuits which use devices such as transistors and
c rcuits,
and
which
are capable of voltage and power gain as
OSS.
xrcuits using only resistors, capacitors, transformers,
referred to as passive.
integrated
well
as
etc., are
AMPLITUDE
voltage
level of a signal.
May be measured in volts
or
decibels,
era
y corresponds to the volume or intensity of an audio signal.
BALAfJCED
^
circuit arrangement in which two conductors are designated
as
signa
~)» and the third is a shield and chassis ground. The
sigua
ines are of opposite polarity at any given moment,
and
are
of
equal
potential
with respect to ground,
balanced input amplifiers
are
use
on a
Ashly SC series products^to improve hum and noise
rejection,
umpering signal minus (—) to ground provides an unbalanced input.
BREATHING
A
usually
undesirable
fluctuation of background noise
compressor action. (Also called "Pumping.")
resulting
from
BUTTERWORTH
f
particular filter
response
shape.
The
response
is
ssentially
flat
within
the pass-band,
is 3dB down
at
the
cutoff
frequency, and continues to attenuate at a constant slope.
Also called a
maxima
y t at
or
critically damped" filter shape,
it is very popular
for crossovers and shelving filters.
CENTER FREQUENCY
The
frequency
(or
parametric
equalizer
boost/cut control has
pitch) at which a filter is
most
effective.
In
a
»
it
refers
to the frequency where
a
particular
maximum effect.
COMPRESSOR
An
amplifier wliich reduces
predetermined "threshold."
its gain as its input is increased
beyond
a
DAMPING
A force which opposes the tendency of a system to oscillate,
dB
A
unit
by
wnich
audio
levels
can
be
COMPARED.
Often
thoroughly
misun erstood
are
the concepts that decibels represent the level
of
a
signal
compared to some reference level (15 dB cut means a certain level
ess
an a previous level
the absolute level of the signal need
not
decibels are a logarithmic unit.
Some handy numbers
to remember when dealing with decibels;
+3 dB - Double Power
+10 dB = lOX Power
+6 dB - Double Amplitude,
+20 dB = lOX Amplitude, lOOX Power
Quadruple Power
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