VDO MD 4000, Руководство пользователя

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USER INSTRUCTIONS
English
General information
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Installation
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Basic function
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The MD4000 menu function
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Guarantee
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C O N T E N T S
GENERAL INFORMATION
This DAB receiver MD4000 is designed to be used with the MR4000 head unit.
This user manual refers directly to the use and function of the MD4000 when connected to the
approved head unit.
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D A B ( D i g i t a l A u d i o B r o a d c a s t )
DAB refers to Digital Audio Broadcasting, a system whereby several programs can be transmitted
simultaneously on one frequency through the compression of digital audio signals. Unlike
existing analog AM and FM broadcasts, DAB does not suffer from the same interference that can,
on occasion spoil the listening pleasure of such AM and FM broadcasts. You may have noticed
that when listening to an FM broadcast, especially whilst driving a car that the signal may hiss
and fizz as well as fade in and out. This hissing and fade occur as a result of the FM signal
bouncing of large objects such as trees, buildings, bridges and hills. This is known as multipath
interference, during multipath interference the signal arrives at your radio in a confused and out
of phase state.
DAB broadcast and reception offers many benefits and cures many of the problems associated
with Analog broadcasts. As your DAB receiver is Digital it contains a computer that is able to sort
through any distortion in multipath radio signals, and thereby enhance the main signal and offer
a clear reception even in challenging environments and built up city areas. This gives the result
of a quality of music comparable to that found on the latest musical compact discs. In utilising a
DAB receiver you will also benefit from up to the minute, interference free data services as well
as additional radio broadcasts.
DAB broadcasts are transmitted in a multiplex on a single frequency, this enables an entire
collection of radio channels or services to be broadcast on the same single frequency. These
groups or collections of channels and services are known as an “ENSEMBLE”.
Some of the larger DAB broadcast stations may transmit several ensembles covering a broad
spectrum of programs to cater for many tastes. The amount of programs within an ensemble is
flexible and dependant upon the provider and even in some cases the time of day or day of week.