Function
Function
Rear seat entertainment module (RSE)
The rear seat entertainment system is supplied power and regulated by the rear seat entertainment module (RSE) (16/124).
When the rear seat entertainment module (RSE) receives a switch-on command from the infrared remote control via the IR receivers in one of the head restraints, it performs a simple system check and then sends commands to other system components for activation. Once a screen (16/81A, B) has been selected with the infrared remote control, the rear seat entertainment module (RSE) identifies the selected screen and displays a menu from which the user can select the functions described below:
- Independent shifting of three audio/video inputs (DVD, TV (if installed) and AUX)
- Image adjustment (image colour, brightness, contrast and aspect ratio)
- Audio settings (bass, treble and volume)
- Language selection for on-screen instructions
- Switch individual screens ON/OFF
The rear seat entertainment module (RSE) also determines which media source has been linked to the selected screen and forwards the commands in an appropriate protocol. For example, if screen 1 is set for DVD playback and an infrared playback command is detected at screen 1, it will be received, stored and forwarded to the DVD player (16/82) in the DVD player's infrared protocol. A fixed memory stores the instruction language used and current audio and video settings for the respective output channel. These settings are loaded upon start. Volume is automatically set to low level.
Rear audio separation module (RAS)
The rear audio separation module (RAS) (16/122) is a unit with dual functions. The first is the production of continual infrared signals for the wireless headphones (audio is in headphone mode as standard) via the IR transmitter (16/125). The second is integration with the vehicle's rear speakers (16/17, 16/18 (S80) 16/5, 16/6, 16/57, 16/58 (XC90)) for media selection.
When the unit is in standard mode, audio signals are sent from the front audio system to the rear speakers. When selected using the remote control, the rear audio separation module (RAS) is activated and audio signals from the front audio system are replaced with audio signals from the rear seat entertainment system. In rear seat entertainment system mode, media signals for the right or left screen can be selected via the remote control.
Note! Lowering the volume of the screen will increase the signal/noise ratio of the headphones. Optimal headphone output is obtained by setting screen volume to 75%. Headphone volume can then be set on the headphones themselves.
Infrared (IR) control
Each screen houses an IR receiver. The IR receivers are connected to the rear seat entertainment module (RSE) (16/124) and are activated when the rear seat entertainment module (RSE) is supplied power. When a button is pressed on the remote control, it emits a signal with infrared light. The coding of this signal varies depending on which button was pressed. The IR signal is received by the IR receiver below the respective head restraint screen (16/81A, B) and is forwarded to the rear seat entertainment module (RSE) for processing.
The remote control can be used to switch between different audio and/or video inputs in the system:
- DVD player, audio/video
- AUX input, audio or audio/video
- Audio from the front audio system to one of the headphones, both headphones or separately to one of the headphones and the rear speakers
- Audio/video from a TV receiver (if installed) to one or both screens.
The remote control is used for selection by aiming it at the screen that is to respond to the command. The command from the remote control is received by one (or both) of the IR receivers located below the screens (16/81A, B). The integrated infrared receiver is activated when the rear seat entertainment module (RSE) (16/124) is supplied power. The receiver forwards the command to the rear seat entertainment module (RSE). The rear seat entertainment module (RSE) will select AV or audio source for the screen in question. The remote control can then be aimed at the other screen to select a source for that screen.
DVD player
Note! There may be a slight delay between selecting a DVD function with the remote control and activation of the DVD player function. A message will appear on the screen to confirm that the DVD function was selected. Display of "Not permitted" indicates that the DVD player is still processing a previously selected function.
The DVD player is not operational until the rear seat entertainment module (RSE) (16/124) has been activated via an infrared switch-on command from the remote control and the screens are lit.
Note! This means, for example, that a disc in the DVD player (16/82) cannot be ejected until the rear seat entertainment system has been switched on.
A microprocessor is used to control the power supply to the DVD player based on the position of the ignition key. This is handled via a connection from the ignition switch to the rear seat entertainment system (RSE). The system is functional when the ignition key is in position II. If the voltage in the lead is high, the DVD player can be supplied power. If voltage in the lead is low, the system cannot be supplied power. The lead for controlling power supply is also used to activate the fan on the rear of the player.
The microprocessor is also used to send commands to and receive information from the DVD mechanism. IR commands from the remote control are received by the rear seat entertainment module (RSE) and come to the DVD player via the IR pin on the rear connection block (ISO connection). IR commands are interpreted by the microprocessor. The DVD player is used to read the source media, which consists of DVDs and CDs that fulfil relevant standards. The DVD player does not read CD-R discs. The use of DVD-R, CD-RW and DVD-RW discs in the DVD player is also discouraged.
Note! Introduction of a new version of the DVD player is expected week 5 2005. The new DVD player can play DVD-R/+R, DVD-RW/+RW, CD-R and CD-RW discs. It can also read Kodak photo CDs and play MP3 files in the disc's root directory and subfolders. The DVD player will also be able to read play lists for MP3 files in M3U format.
When a DVD is inserted in the opening, DVD playback starts automatically if the disc does not have a play menu. DVD playback can be resumed from a pause, for example if the ignition is switched off while a movie is being played. Playback then resumes where it left off once the ignition is switched back on. Audio and video signals are fed out from the DVD player from the connection block (ISO connection) on the rear of the unit.
Headphones
Two sets of IR headphones are included. Any number of headphones can be used provided they are within the area of the IR transmitter. The wireless headphones use an infrared signal. There must be a free path between the transmitter and the receivers on the side of the headphones. If the path is blocked, audio will be interrupted. The headphones are activated by pressing the power button on one side of the headphones. They switch off automatically 3-4 minutes after the IR transmitter has stopped sending a signal.
Note! Lowering the volume of the screen will increase the signal/noise ratio of the headphones. Optimal headphone output is obtained by setting screen volume to 75%. Headphone volume can then be regulated using the wheel on the headphones themselves.