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AM
Amplifier
Analogue
A/V input
Balance
Bandwidth
Bass
Black level
Copy protection
CVBS
DAB
dB
DCDi™
Digital
DLS
®
Dolby
Surround Sound
DTS Digital Surround
12. Glossary
Amplitude Modulation. A method of radio transmission, by which the information part of the
signal causes the amplitude to vary without affecting the frequency.
An electronic device that takes in an original signal, gives it more power and provides it as an
output.
A continuously varying action, or movement that takes time to change from one position to
another. Standard audio and video signals are analogue. An analogue signal has an infinite number
of levels between its highest and lowest value. (Not like digital, where changes are by steps.)
Allows input of Audio/Video signals.
Adjusts the relative volume levels of left and right channels for optimal stereo effect.
Compensates for channel imbalance and non-symmetrical loudspeaker positioning
A frequency range, or 'band' of frequencies between the limits defined by the 'half power
points', where the signal loss is -3dB. In audio and video, it is this band of frequencies that can
pass through a device without significant loss or distortion.The wider the bandwidth, the better
the quality that results, such as a sharper picture, better sound, etc.The higher the bandwidth
number the better the performance (300 MHz is better than 250 MHz.). When a signal passes
through a path with more than one device (including cables) the limiting factor (bottleneck) in
that path is the device with the narrowest bandwidth.
The lower range of audio frequencies, up to approximately 500 Hz.
More commonly referred to as 'brightness', the black level is the level of light produced on a
video screen.
Copy protection is a technical protection measure designed to prevent duplication of
copyrighted works.
CVBS stands for 'Composite video, blanking, and sync'. A standard video signal as output by
VCRs and satellite receivers. CVBS combines the colour, luminance and synchronization
information in one signal.The audio signal is transferred separately.
Digital Audio Broadcast. DAB is a terrestrial digital broadcasting standard which is recognized
by the IUT (International Union for Telecommunications).The use of proper DAB frequencies
(Band III and L-Band) allows a good quality transmission. DAB programs are broadcast inside a
multiplex which is composed of six to ten radio stations on a single frequency. DAB can carry
not only audio but also PAD (Program Associated Data) or NPAD (Non Program Associated
Data) such as text, pictures, data and even videos: it is then called DMB (Digital Multimedia
Broadcasting).
Decibel.The minimum change in sound intensity that a human ear can distinguish. A doubling of
volume is a 10 dB increase.To double volume in a stereo system, a 10-fold increase in power
output (WATTS) is required.
DCDi™ by Faroudja. stands for Directional Correlation Deinterlacing and is a package of
picture innovations that digitally adjusts and optimizes picture quality to optimal contrast, colour
and sharpness level.
A system of data or image values in the form of discrete, non-continuous codes, such as binary.
When data is in a digital format, it can be processed, stored (recorded) and reproduced easily
while maintaining its original integrity.
Dynamic Label Service. Radio text information, provided by DAB radio stations.
Dolby Stereo is the name given to the four-channel surround sound developed by Dolby
Laboratories and introduced into movie theaters in the 70s. It employed a matrix encoding
scheme called Dolby Surround which recorded four channels of information on two channels.
The two channels are decoded into L, R, Center and Surround upon playback.The centre
channel is recorded identically on the left and right channels. Also see '9. Surround modes'.
DTS: abbreviation for Digital Theater System. Like Dolby Digital, DTS is another 5.1-channel
surround sound format that is available in movie theaters, and as an optional soundtrack on
some DVD-Video movies for home theatre viewing. DTS is not a standard soundtrack format
for DVD-Video, and is not used by HDTV or digital satellite broadcasting.
Also see '9. Surround modes'.
ENGLISH
43
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