GF82.60-P-2030GQU Hd Radio (High Definition Radio) Function

GF82.60-P-2030GQU HD Radio (High Definition Radio) Function
- with CODE (517) HD radio

Function requirements, general
^ Status circuit 30 On or circuit 15R On
^ System is authorized and operating properly
^ Roof antenna module (A2/93) and rear window antenna FM amplifier (A2/19) operating properly

HD radio (High Definition radio), general
The HD radio function is implemented in the high definition tuner control unit (N87/8).The high definition tuner control unit is a combined AM/FM/Weather Band (WB) receiver with HD radio function and satellite radio for audio and traffic data reception. The AM/FM receiver function allows reception of analog AM and FM signals. FM signal reception is optimized by use of a double tuner.

The WB feature allows reception of WB signals in the USA. The HD radio function allows additional reception of digital carrier waves for analog AM/FM programs, which are also broadcast by the stations.
The HD radio function improves the audio quality using digital technology:
- FM (96 kbit/s):
- CD sound quality (no multipath interference)
- AM (36 kbit/s):
- FM sound quality (stereo)

The stations also broadcast other audio channels and data with the digital carriers. This supplements the program with up to 2 additional audio channels per frequency (e.g. foreign language program from "National Public Radio") and supplemental information (e.g. title and artist) can be received.
Additional transmission of digital carriers is designated as "On Channel", the digital station is tuned to the same frequency as the analog station.
The digital transmission process in the FM and AM band is known as "in-band".
In contrast to satellite digital audio radio (satellite radio) (SDAR), with HD radio regional stations and programs can be receive without incurring fees
The SDAR function allows reception of over 100 digital audio channels from the "Sirius Satellite Radio" provider. Moreover, additional data such as title and artist and the entire station list are transmitted.

As of 1.7.09 Real Time Traffic Data (RTTD) can also be received. RTTD is real time traffic data that is broadcast by the "Sirius Satellite Radio" provider. This data is available in the USA and is transmitted in loops of approx. t = 5 min. The data contain accident and traffic jam messages as well as traffic flow information. The data are made available to the navigation.
To achieve multi-channel reception, the Sirius satellite radio signal is transmitted 3 times (from two satellites and a network of terrestrial stations).
The HD radio feature allows the following signals to be received:
- Analog and digital AM/FM signals as well as Weather Band signals

The SDAR function allows the following signals to be received:
- Signals for S-band satellite and S-band terrestrial from stations of the "Sirius Satellite Radio" provider, with the traffic information signals contained therein

Operating instructions
The HD radio can be controlled with the following components:
- Keys on the COMAND operating, display and controller unit (A40/3)
- Left multifunction steering wheel button group (S110) and right multifunction steering wheel button group (S111)
- Voice control of the voice control system (VCS [SBS])

Function sequence
The high definition tuner control unit receives the FM2 and Weather Band signals via the following route:
- Antenna structure in the rear window
- Direct line
- FM rear window antenna amplifier
- Direct line
- Roof antenna module
- Direct line

The high definition tuner control unit receives the "S-band satellite and S-band terrestrial signals" with the traffic information signals contained therein via the following route:
- SDAR antenna (A2/93a5)
- Direct line

The high definition tuner control unit receives the AM and FM2 signals via the following route:
- FM/AM/RRCL (FZV) antenna (A2/93a1)
- Direct line

The high definition tuner control unit demodulates the analog AM and FM signals using the two integrated double tuners and decodes the digital AM and FM signals using the integrated HD radio decoder chip.
The signals for "S-band satellite and S-band terrestrial" are also demodulated and decoded by the high definition tuner control unit.

Demodulated and decoded analog and digital signals are transferred as digital audio and data signals from the high definition tuner control unit via the Media Oriented System Transport (MOST) to the COMAND operating, display and controller unit and the navigation unit integrated into the COMAND operating, display and controller unit. The COMAND operating, display and controller unit shows the information contained in the signals via the display of the COMAND operating, display and controller unit. This procedure runs internally in the COMAND operating, display and controller unit. The traffic data is processed and displayed on the navigation unit integrated into the COMAND operating, display and controller unit.
The operator can now use the "Audio" menu item and "Sat Radio" submenu item with the aid of the following controls in each band to select the desired station:
- The buttons on the COMAND operating, display and controller unit
- Multifunction steering wheel button groups
- Voice control via the VCS [SBS]

The control signals from the buttons on the COMAND operating, display and controller unit are processed internally.
The control signals from the multifunction steering wheel button groups are forwarded to the COMAND operating, display and controller unit via the following route:
- Steering LIN
- Steering column tube module (N80)
- Engine compartment CAN (CAN C)
- Instrument cluster (A1)
- Interior CAN (CAN B)

When voice control is activated on the VCS [SBS], the voice commands are received by the handsfree system microphone group (A67b1) and forwarded via a direct line to the COMAND operating, display and controller unit.

Detailed information about activation and control of the VCS voice control can be found in the "Voice control function" document.

After the desired station has been selected, the audio signals in vehicles with code (810) Sound system are transferred by the COMAND operating, display and controller unit via the MOST to the amplifier for sound system (N40/3) and from there via direct lines to the following speakers:
- Speaker Left front door (H4/5)
- Right front door speaker (H4/6)
- Left rear door speaker (H4/3)
- Right rear door speaker (H4/4)
- Left front door tweeter (H4/33)
- Right front door tweeter (H4/34)
- Left rear door tweeter (H4/35)
- Right rear door tweeter (H4/36)
- Center cockpit speaker (centerfill) (H4/27)
- Left rear surround speaker (H4/54)
- Right rear surround speaker (H4/57)

The audio signal for the subwoofer speaker (H4/29) travels from the COMAND operating, display and controller unit to the sound system amplifier via MOST and from there, over direct lines, to the subwoofer amplifier (N40/9) and then to the subwoofer speaker.

On vehicles without code (810) Sound system, the audio signals and data are output by the COMAND operating, display and controller unit via direct lines to the following speakers:
- Left front door speaker
- Right front door speaker
- Left rear door speaker
- Right rear door speaker
- Left front door tweeter
- Right front door tweeter
- Left rear door tweeter
- Right rear door tweeter