Data Compression; Audio Stream; Dab (Digital Radio) Reception - TechniSat DIGITRADIO 216 Instruction Manual

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 go to www.dabplus.de or www.dabplus.ch.

7.1.1 Data compression

With this, digital radio takes advantage of the properties of human hearing. The human ear does not
perceive sounds which are found under a specific minimum volume. Data which are found under the so-
called audibility threshold can, therefore, be filtered out. This is possible because, in a digital data stream,
the relevant relative volume for other units is also saved for every unit of information. Moreover, in an audio
signal, the quieter parts are superimposed by louder ones at a specific limit value. All audio information in
a piece of music that is below the so-called listening threshold can be filtered out of the transmitted signal.
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

In the case of digital radio, audio streams are continuous data streams that contain the MPEG 1 audio layer
2 frames and thereby represent acoustic information. This enables standard radio channels to be broadcast
and listened to on the receiver side.
Digital radio provides you not only with excellent sound quality radio but also additional information. This
could relate to the channel currently being broadcast (DLS e.g. track, artist) or could be independent of this
(e.g. news, weather, traffic, tips).

7.2 DAB (digital radio) reception

> Press the MODE button and select DAB Mode. Digital Radio appears on the display.
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