JRC Alphatron SSRS, Installation And Operation Manual

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III Introduction
III.1 Product Description
The Alphatron SSRS sound reception system has been designed to:
• Receive and detect fog horn sounds from other vessels and pinpoint the direction of the signal source.
• Detect signals with a fundamental frequency ranging from 70 Hz to 820 Hz.
Detected horns are amplified and played through the speaker on the display unit and the direction of the signal source
appears on the display, with an accuracy of +/- 10 degrees. The Alphatron SSRS has adaptive background noise
canceling to filter out unwanted sounds through advanced digital signal processing. Multiple display units can share the
same microphone unit through an Ethernet connection.
Part Numbers
For part numbers refer to Spare Parts on page 37
• Caution: Electrostatic Devices
• This equipment contains CMOS integrated circuits. Observe precautions for handling electrostatic sensitive
devices. Electrostatic discharge (ESD) may damage this equipment.
Figure 1: Product Image Display
Figure 2: Product Image Microphone
III.2 System Description
A sound reception system is an acoustical electronic navigational aid that enables an individual to hear sound signals
from other ships like fog horns when standing inside a totally enclosed bridge space. This is to perform the look-out
function as required according to the International Regulations for Preventing Collisions at Sea, 1972.
The system works by listening and detecting the direction of a fog horn. The Alphatron SSRS system is always listening
for sounds on the outside of the ship and will only playback and display sounds once a horn has been detected. The
ship's own horn can be suppressed by closing a closing contact on the Alphatron SSRS system, which will disable
detection for the duration it is held closed.
8 | Introduction