Stereo Infrared Headset System (SIHS 2000NG) Communications, Passenger Address and Entertainment
The SIHS 2000 NG is a cordless infrared headset for communication. Designed for fixed and rotary wing aircraft with the purpose of overcoming reported information with current public address systems in general, and to add a safety feature in particular as it removes the potential hazards that may be encountered by passengers while evacuating in an emergency.
The system consists of a control unit, charging station, transmitters and headsets.
The control unit receives audio signals from the aircraft PA, intercommunication and entertainment systems and transmits them to passenger headsets via a number of transmitters suitably mounted within the cabin. The control unit receives and processes audio inputs which can be selected externally as required.
The transmitters are lightweight devices similar in shape and dimension to passenger reading lights and consist of diodes, which emit infrared signals.
Equipment specification:
Power requirements: 28 VDC nominal
Voltage supply variation: 24 to 35 VDC
Power consumption: 200 mA standby,
4.5 Amp max. with 10 transmitters in each section
Audio frequency range: 20 Hz to 20 kHz
Input:
- Up to 3 independent entertainment inputs
- 2 PA inputs (pilot, copilot)
- 1 intercom input (flight attendant station or aircraft intercom system)
Input audio level: 300 mV to 10 VRMS
Input audio impedance: 600 Ω
Modulation: FM
Carrier frequency channel 1: 2.3 MHz
Carrier frequency channel 2: 2.8 MHz
Distortion: at 1 kHz, less than 1%
Weight: 750 g
Power requirements: 28 VDC (supplied by control-unit)
Supply voltage variation: 24 to 33 VDC
Power consumption: 120 mA
Infrared wavelength: 950 nm
Radiation angle: 120°
Weight: 150 g
Frequency response: 20 Hz to 18 kHz
Power requirements: 3.6 VDC (rechargeable battery pack)
Distortion: at 1 kHz, less than 1%
Modulation: FM
Max volume: 110 dB
Battery type: NiMh
Battery capacity: 900 mAh
Battery voltage: 3.6 VDC
Operating time: more than 15 h
Weight: ≈ 400 g
Power requirements: 230 VAC / 50 Hz, 450 W
Standard charge current: 200 mA (each headset)
Trickle charge current: 25 mA (each headset)
Output: for 20 headsets
