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of hearing in a piece of music can be filtered out of the signal to be broadcast. This
leads to a reduction of data in the data stream to be transmitted, with no perceptible
difference in sound for the listener (HE AAC v2 process as a supplementary codification
process for DAB+).
7.1.2 Audio stream
With digital radio, audio streams are continuous data streams which contain the MPEG
1 audio layer 2 frames and thereby represent acoustic information. They are used to
broadcast normal radio programmes, which you can listen to on the receiver. Digital
radio provides you with not only radio in excellent sound quality but also additional
information. This may refer to the programme being broadcast or be independent
information (e.g. news, weather, traffic, tips).
7.2 DAB+ (digital radio) reception
>
Press the
DAB/FM
button until
[DAB]
is shown on the display.
If DAB+ is being started for the first time, a full station scan is performed. After
the scan is complete, the first station is played back in alphanumeric order.
Some text (e.g. menu items, station information) may be too long to show on
the display. These will be then shown as running text or abbreviated shortly
thereafter.
7 DAB+ (digital radio) function
7.1 What is DAB+?
DAB+ is a new digital format through which crystal clear sound with no noise can
be heard. In contrast to conventional analogue radio stations, DAB+ can be used to
broadcast multiple stations on one and the same frequency. This is referred to as an
ensemble or multiplex. An ensemble is comprised of the radio station, as well as several
service components or data services which are broadcast individually by the radio
stations. For further information, please visit
www.dabplus.de
or
www.dabplus.ch
.
7.1.1 Data compression
By doing so, digital radio takes advantage of the properties of human hearing. The
human ear does not detect sounds that are below a certain minimum volume. Data
below the absolute threshold of hearing can therefore be filtered out. This is possible
because, in a digital data stream, the relevant relative volume for other units is saved
for every unit of information. At a specific threshold, the quieter parts of a sound signal
are blocked out by the louder parts. All the sound information below the threshold
