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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 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).
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