Ashly Electronic Amplifier none - Manual (Page 34)

dBV
Decibel Volts, an update of the dBm definition where 0 dBV = the same
voltage level as 0 dBm, but with no regard to power or impedance. 0
c"'V =
0.778 Volts. This unit is much more appropriate for modern i.^dio
equipment with high impedance inputs and low impedance outputs.
DISTORTION
Generally refers to ANY modification of an aulio signal whicn prodjces
new frequencies which were not in the original. Examples are harmnic
distortion, where a circuit adds overtones to a fundamental signal, and
intermodulation or IM distortion, where two frequencies beat together to
produc“ sum and difference frequencies.
FEEDBACK
Gene- ally '-e'-ers to any orocess where an output is in some form routed
back CO an input to establish a loop. Negative feedback tends to be be
self stabilizing, while positive feedback causes instability.
FILTER
A cii.uit «lesigned to pass some frequencies, but not others. There are
three general categories of filters; High-pass, band-pass, and low-pass.
The -'igh-pass filter passes frequencies above a certain limit, the low-
pass )asses frequencies below a limit, and the band-pass passes one group
of t. *^queru: les without passing those above or below. Our equalizer uses
band tass filters, crossovers use high and low-pass filters.
FREQUENCE
The
eye ’ t
seal e
epetition rate of a waveform. Frequency is measured in Hertz. One
p e r s e c o n d ( c p s ) i s o n e H e
t h e h i g h e r i t s f r e q u e n c y .
/
U
T \
\ I I / .
higher a note on a niusii
FREQUENCV -(ESPONSE
Refers to relative gain ano loss at various frequencies across the audio
band. May be illustrated oy a graph called a frequency response plot,
usual' / graphing decibels vs. Hertz or octaves.
HERTZ (hz.
The iitiit of frequency measurement,
this ^.xplains it perfectlyl
(Formerly called Cycles-per-Second:
HEADROOM
Refers to the increase in level above normal operating level that can be
obtai'ied without clipping. Usually expressed in dB.
IMPEDANCi
Essen'lally 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
Kilonertz. 1,000 Hertz.
LEVEL
The magnitude of a signal, expressed in decibels or volts.
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