Xoro HXS 532 - Инструкция (Страница 21)

20
ADDENDUM
SOUND GLOSSARY
home-theater system, refers to achieving correct
balance between all the channels of the system.
Audible distortion occurring when the peaks of an
amplifier's output are flattened ('clipped'). When the
input is too high, an amplifier has insufficient power
to accurately reproduce the output waveform.
Usually the "clipped" waveform contains an excess
of high-frequency energy. The sound becomes
hard and edgy. Hard clipping is the most frequent
cause of "burned out" tweeters. Even a low-
powered amplifier or receiver driven into clipping
can damage tweeters which would otherwise last
virtually forever.
An electronic circuit which splits an audio signal
into different frequency bands. Crossovers are
used in speakers to route the various frequency
ranges to the appropriate drivers. Additionally,
many crossovers contain various filters to stabilize
the impedance load of the speaker and or shape
the frequency response. Some crossovers contain
levels controls to attenuate various parts of the
signal.
Unwanted breakthrough of one channel into
another. Also refers to the distortion that occurs
when some signal from a music source that you
are not listening to leaks into the circuit of the
source that you are listening to.
Refers to the ability of an audio component to
"stop" after the signal ends. For example, if a drum
is struck with a mallet, the sound will reach a peak
level and then decay in a certain amount of time to
no sound. An audio component that allows the
decay to drag on too long has poor damping, and
less definition than it should. An audio component
that is over damped does not allow the initial
energy to reach the full peak and cuts the decay
short. "Boomy" or "muddy" sound is often the result
of under damped systems. "Dry" or "lifeless" sound
may be the result of an over damped system.
We perceive differences in volume level in a
logarithmic manner. Our ears become less
sensitive to sound as its intensity increases. 1 dB
is the minimum perceptible change in volume, 3 dB
is a moderate change in volume, and about 10 dB
is an apparent doubling of volume
hreshold of hearing 0 dB
CLIPPING
CROSSOVER
CROSS-TALK
DAMPING
DECIBEL (dB)
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front
front, and
hreshold of pain 130 dB
Whisper: 15-25 dB
Quiet background: about 35 dB
Normal home or office background: 40-60 dB
Normal speaking voice: 65-70 dB
Orchestral climax: 105 dB
Live Rock music: 120 dB+
Jet aircraft: 140-180 dB
Any difference, apart from level, between an original
signal and one that has been processed. Anything
that alters the musical signal. One cause may be the
overloading of the input stage of an amplifier, but
many other forms of distortion, such as harmonic
distortion are common.
Is a five-channel system consisting of left ,
center, right left rear, right rear channels. All
processing is done in the digital domain. Unlike Dolby
Prologic in which the rear effects channels are
frequency limited to approx. 100-7000Hz, Dolby
Digital rear channels are specified to contain the full
20-20Khz frequency content. The AC3 standard also
has a separate subwoofer channel for the lowest
frequencies.
Also referred to as Dolby Digital 6.1, adds a rear
center channel to the existing left, center, right and
rear speakers. This format requires a 6.1 processor or
receiver and DVDs that are 6.1 encoded.
Is a four-channel system consisting of left, center,
right and rear channel (the single rear channel is
usually played through two speakers).
A high frequency speaker with a dome-shaped
diaphragm.
Digital Theater System. A multi-channel
encoding/decoding system. Used in some movie
theaters. Also now included in some home-theater
processors. A competitor to Dolby Digital.
The range between the loudest and the softest
sounds that are in a piece of music, or that can be
reproduced by a piece of audio equipment without
distortion (a ratio expressed in decibels). In speech,
the range rarely exceeds 40 dB; in music, it is
greatest in orchestral works, where the range may be
DISTORTION
OLBY IGITAL
OLBY IGITAL URROUND
OLBY ROLOGIC
OME WEETER
YNAMIC RANGE
D D
D D EX S
D P
D T
DTS
D