Part 2

Audio System

Integrated Head Unit (IHU)







The Integrated Head Unit (IHU) is located behind the TSD. The IHU contains the radio functionality for the audio system. The IHU communicates on the MOST ring with the components in the audio system. The IHU is also the timing master for the MOST ring. The IHU is the controls and manages the MOST ring and provides the allocations of channels, system power management and the functionality and co-ordination of the other system components.

The IHU also controls the operation of the infotainment relay. The infotainment relay is located in the rear fusebox and the relay coil is controlled by the IHU which provides a ground for the coil. The relay supplies power to a number of the audio system components.

Radio signals are received by antennae located in the left hand rear quarter window and the rear screen. An FM (frequency modulation) antenna amplifier is located in the upper taildoor and passes AM (amplitude modulation) /FM (frequency modulation) signals from the rear screen antennae to the IHU. A diversity antenna is located in the left hand rear quarter window. A FM (frequency modulation) diversity antenna amplifier is located behind the left hand luggage compartment trim panel, below the window and passes FM (frequency modulation) radio signals from the rear quarter window diversity antenna to the IHU. The FM (frequency modulation) diversity system uses a multi-antenna system which selects the strongest signals from the antennae. In weak signal areas the amplifier uses an integral ultrasonic noise detector to find the least distorted antenna signal to ensure maximum reception quality is maintained.

Diagnostic messages retrieved via Land Rover recommended diagnostic equipment are routed from the IHU through the instrument pack, prior to being transferred to the diagnostic socket.

6 Disc CD (compact disc) Autochanger







The six disc CD (compact disc) autochanger is located at the rear of the glove compartment. The CD (compact disc) autochanger is a standard fitment on all 2005 MY Range Rovers. The CD (compact disc) autochanger is capable of playing audio CD (compact disc) s and MP3 CD (compact disc) s. The autochanger uses a six disc magazine which is loaded into an aperture on the front of the unit.

The CD (compact disc) autochanger is connected on the MOST ring and receives a permanent fused power supply from the passenger compartment fusebox.

SATELLITE DIGITAL AUDIO RADIO SERVICE (SDARS) (NAS VEHICLES ONLY)
SDARS is a satellite based radio service which is currently only available in the USA. Digitally encoded audio transmissions are broadcast to receivers from two satellites or from ground based repeater stations. It is possible for the SDARS transmissions to be received in Canada and northern Mexico but reception is not guaranteed outside of the USA.

The service is provided by a company called Sirius. The service comprises over 100 channels of digital entertainment which is provided by subscription requiring a monthly payment.

Operation of the SDARS system is the same as the radio operation with selections made using the TSD icons or the TSD buttons and rotary controller.

The SDARS system requires additional components to be added to the audio system. An SDARS antenna and a receiver are fitted to allow reception of the service.

The customer must subscribe to receive the SDARS service. If the user selects a channel to which subscription is not authorized, the TSD will display the telephone number of the SDARS providers subscription service. The telephone number is stored in the IHU and can be changed or amended using Land Rover recommended diagnostic equipment.

SDARS Antenna







The SDARS antenna is located in the roof pod and is shared with the telephone system and navigation system where fitted. The roof pod is located externally in a central position towards the rear of the roof.

The roof pod contains two antennas for the SDARS system. One receives the digital transmissions from the SDARS satellites and the second receives transmissions from the ground based repeater stations.

The SDARS antennas are connected to the SDARS receiver using co-axial cables.

SDARS Receiver







The SDARS receiver is a dedicated SDARS head unit and tuner which is controlled by the IHU on the MOST ring. The receiver is located in the left hand rear of the luggage compartment.

The receiver processes the signals from the SDARS antennas. The signals are filtered and the receiver determines which of the two signals is the strongest with the least distortion to use for the audio output. For example, if the vehicle drives into a tunnel, the receiver will change from a satellite signal to a repeater station signal to maintain the strongest signal.

AUDIO SYSTEM DIAGNOSTICS
The TSD can store diagnostic fault codes to enable diagnosis of system malfunctions. The fault codes can be accessed using Land Rover recommended diagnostic equipment or by using the on-board diagnostic routine available on the TSD.

STEERING WHEEL SWITCHES







Additional control of the audio system is available in the form of steering wheel mounted switches which are located on the right hand side of the steering wheel. The switches provide for volume adjustment, change pre-set radio station, fast forward tape or CD (compact disc) tracks.

The steering wheel audio control switches are hardwired to the rotary coupler. An I bus connection from the rotary coupler is then connected to the instrument cluster which processes the analogue signals from the switches into digital signals. These digital signals are then passed from the instrument cluster to the IHU to control the requested audio functions.

INITIAL SCREEN DISPLAY
Once powered the TSD will initially display the 'Land Rover' image for a short time followed by the last displayed screen or menu. On a new vehicle, when the system is operated for the first time, the system will display the 'Home' menu to allow the user to adjust the factory default settings. The system settings are set to suit the market to which the vehicle is to be delivered. These can be changed by the customer to suit their preferences.

The infotainment system can be operated at times when the ignition key is removed from the ignition switch and is known as one hour mode. Pressing the audio on/off button will power the system for a period of one hour. After the one hour period, the system will power down to avoid excessive drain on the vehicle battery.

RADIO OPERATION
The radio is operated from the TSD. Access to the radio mode can be achieved in two ways; by touching the Audio Video icon on the home menu or by pressing the Mode button, turning the RH rotary control until Radio is highlighted and then pressing the Mode button for a second time.

Selecting the radio option will allow the user to:
- Select the band (AM (amplitude modulation), FM (frequency modulation), MW, SDARS)
- Auto store stations
- Select preset stations
- Use the 'Seek' function to locate stations
- Manual tuning to locate stations
- Program search by station type (PTY)
- Enable RDS station reception
- Enable traffic and news broadcasts

CD AUTOCHANGER OPERATION
The CD (compact disc) autochanger is selected from the TSD. Access to the CD (compact disc) autochanger can be achieved in two ways; by touching the CD (compact disc) icon if the TSD is currently displaying an audio source (radio, TV etc.) or by pressing the Mode button, turning the RH rotary control until CD (compact disc) is highlighted and pressing the Mode button for a second time.

Selecting the CD (compact disc) option will allow the user to:
- Play CD (compact disc) 's
- Select tracks
- Track search (fast forward/reverse)
- Disc selection (icons 1 to 6)
- Pause to suspend play
- Additional playback features (random play, repeat track, CD (compact disc) scan).

The CD (compact disc) autochanger is capable of playing MP3 discs. The system will recognize an MP3 disc and display additional information on the TSD.

VOICE RECOGNITION
The voice recognition system controls the following systems (where fitted):
- Audio (radio and CD (compact disc))
- Telephone
- Note pad
- Touch screen display
- Rear seat entertainment
- Navigation.

On vehicles without the navigation system, the voice recognition software is contained in the telephone Transceiver Module (TM). The audio system is not supported for voice control by the TM, therefore voice operation of the audio functions is not possible.

On vehicles with the navigation system, the voice recognition software is contained in the navigation computer. The microphone is hardwired to both the navigation computer and the IHU. The navigation computer will allow voice control of the audio system, the telephone system, the rear seat entertainment and the navigation system. The navigation computer supports German, French, Italian, Spanish, USA, UK, Japanese, Dutch and USA languages with male and female voices.

The voice recognition system enables the driver to activate functions of the audio system without operating controls manually. This allows the driver to concentrate on driving the vehicle, improving safety. When the driver speaks one of the defined voice commands, with the voice recognition system active, the voice recognition software converts the command into a control signal for the audio system.

Audio Voice Recognition Functions
The radio can be accessed and controlled by the voice recognition system as follows:
- Radio On This allows the user to operate the radio function. 'Radio on' switches the audio system to radio which comes on with the last selected station.
- Radio Tune This allows the user to tune the radio to the required frequency and waveband.
- Radio Presets This function allows the user to allocate a frequency against a given band preset. The radio must be tuned to the required frequency and wavelength before the preset is allocated. If a preset position already has a frequency and wavelength allocated, the new frequency and wavelength will over-write the existing preset. The auto-store function commands the radio to store the six strongest signals and allocate them against the auto-store presets. Voice commands allow the user to tune the radio to a given preset within the waveband which is currently selected.
- Radio Directory This function allows the user to add a 'nametag' to the current selected frequency and waveband including satellite stations when SDARS is fitted. The nametags are user repeatable association names given to identify a particular frequency and waveband. The voice recognition system allows 20 nametags to be stored. When the nametag function is operating the requested frequency and waveband is displayed in the instrument pack message center.

The CD (compact disc) autochanger can be accessed and controlled by the voice recognition system as follows:
- The voice controls are standard control features with the exception of CD (compact disc) controls which can be accessed using the steering wheel switches. Commands are available for up to 256 tracks on a CD (compact disc). A text numeric format is used for track identification using three numbers, i.e. track 6 will be displayed as 006. MP3 format discs have commands for folder up/down.

The Touch Screen Display (TSD) responds to voice commands to allow the user to change the display mode.

Voice Recognition Settings
A number of settings allow the user to customize the voice recognition system as follows:
- Voice Feedback On/Off This feature allows the user to switch audible feedback on or off for most functions, with the exception of some necessary function which must have feedback to operate correctly.
- Replay The replay command requests the voice recognition system to repeat the last dialogue response within a list in both audible and associated text feedback.
- Notepad The notepad function allows the user to record a series of 10 notes for up to 5 minutes. The user can replay or delete the notes in the order in which they were recorded. It also allows the user to delete the entire contents of the notepad.
- Traffic Message Channel (TMC) The TMC system is part of the navigation system (when fitted). The TMC system provides real time traffic information to the navigation system. The TMC voice commands can be used to switch the TMC On or Off.

AUDIO SYSTEM CONTROL DIAGRAM

NOTE: A = Hardwired, D = HS CAN bus, K = I Bus, P = MOST