Description
Video System
NOTE:
A = Hardwired; N = Medium Speed CAN (controller area network) bus; O = LIN bus; P = MOST ring; T = CoAxial; I = Composite video signal
The Television system has various levels of user control through the Touch-screen, ICP (integrated control panel) and steering wheel control panel. The system includes nine analogue and nine digital channel pre-sets. As with the audio system, the user can search up or down and store by a long press of the selected channel button. The system offers a choice of screen aspect ratios similar to a typical domestic receiver, giving options between the standard 4:3 format, wide screen 16:9 format and zoom to fill the screen.
To provide the strongest possible signal the Television tuner receives signals from 4 antenna sources located in the heated rear window. Unlike domestic systems this system gives a more progressive picture loss if the signal is lost. The signal loss is indicated to the user by a 'loss of reception' screen message.
The Television system is primarily controlled from the Touch-screen and the ICP (integrated control panel) which are located in the center of the instrument panel. Control signals from the Touch-screen display are sent on the MOST (media oriented systems transport) ring to the Television tuner. The Television tuner uses a dedicated CVBS (composite video signal) bus to transmit video signals to the Touch-screen.
Control signals from the ICP (Integrated control panel) are relayed on the medium speed CAN (controller area network) bus to the ICM (information control module). The ICM (information control module) relays the control signals to the Television tuner on the MOST (media oriented systems transport) ring. The ICM (information control module) is the timing master for the MOST (media oriented systems transport) ring and also hosts a gateway function between the medium speed CAN bus and the MOST (media oriented systems transport) ring.
Depending upon the audio system version fitted the Television tuner audio output signals are sent on the MOST (media oriented systems transport) ring to the IAM (integrated audio module) or the power amplifier for speaker output.
TELEVISION TUNER
The television tuner is a DVB-T (digital video broadcasting - terrestrial) receiver and consists of a 'front end' which is made up of a tuner and a demodulator. Following pre-filtering, the tuner converts the signal from the antenna to an intermediate frequency. In the demodulator, the signal is first converted to a basic frequency, so that a signal from a transponder can be forwarded to the MPEG decoder as a transport stream. The transport stream usually contains several television channels along with relevant auxiliary services such as teletext, subtitles and electronic program guides.
NOTE:
Not all digital features such as text and programme listings are currently available.
Control signals from the Touch-screen display are sent on the MOST (media oriented systems transport) ring to the television tuner. The television tuner uses the dedicated CVBS (composite video signal) bus to transmit its video signals to the Touch-screen. The CVBS (composite video signal) system utilizes a single wire transmission system and is limited in bandwidth to less than 6MHz.
No configuration procedure is required if the television tuner is replaced. Calibration of the television tuner using the Jaguar approved diagnostic equipment enables updates to be downloaded as new technology becomes available or any fault concerns require software updates.
Television Antennas
The television tuner receives digital and analogue television signals through 4 antennas located in the heated rear window. 3 of the antennas are connected to the triple antenna amplifier/module located on the RH (right-hand) side of the heated rear window. A fourth antenna is connected to the single antenna amplifier/module located on the LH (left-hand) side of the heated rear window.
The combination of signals from several antennas is known as 'diversity' reception. For example using two or more antennas can reduce the signal error rate by 50%, which is of critical importance for mobile receivers.
Vehicle or other component generated electromagnetic interference may cause unwanted disturbance in the television reception signals. The disturbance may interrupt, obstruct, or otherwise degrade or limit the effective performance of the circuit.
Double coil RF (radio frequency) filters, which act as RF (radio frequency) isolators, are located on both sides of the heated rear window and are used to reduce any electromagnetic interference. The LH (left-hand) side RF (radio frequency) filter is connected across the heated rear window power supply and used to separate the DC (direct current) interference from the RF (radio frequency) signals. The positive filter is present on all vehicle types and markets.
The right hand side double coil RF (radio frequency) filter is only used in conjunction with the television antenna modules and is connected across the heated rear window ground circuit. If a television system is not fitted a filter is used which is linked directly to ground.
Touch-Screen
The Touch-screen is the primary user interface for the television system. From the 'Home' screen menu television is a sub-menu of 'Audio'. The Touch-screen communicates with the television tuner. Video signals to the Touch-screen are transmitted from the television tuner.
Integrated Control Panel
The ICP (integrated control panel) duplicates many of the Touch-screen television user control features. The ICP (integrated control panel) communicates with the television system through the medium speed CAN (controller area network) and MOST (media orientated systems transport) bus systems.
Steering Wheel Controls
Additional control of the television system is available in the form of steering wheel mounted switches which are located on the left hand side of the steering wheel. The 4 switches provide for volume adjustment, change pre-set television stations, select media source and finally audio mute control. The mute control is also used for JaguarVoice control.