TV function
The TV tuner (MOST) (A2/10) is controlled by the COMAND operating, display and control unit (A40/3) via the Media Oriented System Transport (MOST).
In the same way the TV tuner (MOST) (A2/10) receives and processes television programs which have been broadcast in all standards.
The audio quality is limited to mono. The TV system operates with a total of 3 reception modules for picture/sound processing. The tuners used cover a reception range of 30 to 866 MHz. The reception range is divided up internally into three bands (VHF low, VHF high and UHF). Each band has its own controllable pre-stage.
The TV tuner box has 4 antenna inputs which signals from the car antennae are fed into. The antennae are not allocated to a particular tuner but can be used in the same way by any tuner. The audio antenna diversity operates such that is not influenced by the picture evaluation and vice versa.
-----------------------------------------------------------------------------------------
Antenna diversity, function
Antenna diversity function The TV tuner (A2/10) analyzes the reception field strength of the incoming TV antenna signals. The high-frequency signal of the antenna with the largest reception field strength is demodulated (antenna diversity).
Demodulation function
The high-frequency signal received is converted into an intermediate frequency (ZF) and separated into audio and video signal parts. The TV picture thus modulated (red-green-blue signal) and the TV sound are passed on to the COMAND operating, display and control unit (A40/3) and to the operating and display unit rear screen (A40/2).
SEEK function
The TV tuner (MOST) (A2/10) searches on the reception frequency band for the nearest receivable TV station and demodulates it.
-----------------------------------------------------------------------------------------
BEST function,
The TV tuner (MOST) (A2/10) searches the entire TV reception band. In this case, each receivable channel is noted together with its reception field strength. The stations best received (sorted by reception field strength) are stored in the memories of the TV tuner (MOST) (A2/10).
Videotext function
In addition to their television program some stations offer a video text. For this the TV tuner (MOST) (A2/10) is equipped with its own video text decoder.
AUX function
The TV tuner (MOST) (A2/10) has 2 connections for external devices (e.g. video player and DVD player).
SCAN function
A receivable station is demodulated by the TV-Tuner (MOST) (A2/10) for approx. 8 seconds and displayed.The next receivable channel in the frequency bandwidth is then sought and demodulated, and so on.
As of 1.9.02 there are 2 additional video inputs for a video recorder or a video game on the TV tuner (A2/10). It can only be operated at the playback unit.