Sound Reception System - VSS 1

Description.

(Note that what described here is the first generation of this system as there is an imminent release of its second generation.)

The VSS system is a purely marine oriented product (Vingtor) enabeling the navigator on a one man operated bridge to listen to the environmental sound signals from other ships or fog horns that are audible outside the ship when standing inside the enclosed bridge space.

The system is monitoring, according to rules; Resolution MSC.86(70), frequencies between 70 and 820 Hz.

Four (4) VSS-222 weatherproof microphones are mounted outside the wheelhouse and connected to the VSS-111 audio amplifier and loudspeaker within the bridge.The VSS system has «remote muting» of the amplifier circuit when the vessel’s own tyfon is activated. The VSS system has squelch function. Adjustable muting of undesirable sound sources. Microphone Direction Detector (MDD)By use of four microphones the MDD will detect the direction of the incoming signal and activate the corresponding LEDs at the VSS-111 front panel The four microphones operate in pair depending of the direction of the received sound signal.The microphone first detecting the sound will be registrated in MDD and it will lock against influence from the other microphone.This will repeat each time a signal is strong enough to trig the detector. The «bridgewing» pair of microphone will indicate if the sound is coming from the Sb or Ps direction,while the other pair tell if the sound signal is coming from «Fore» or «Aft». The combination of above will indicate the actual sector.

The VSS «Sound Signal Reception System» has been EMC tested according to relevant CENELEC and IEC standards and type tested in order to qualify for Type Approval by Det Norske Veritas / Bureau Veritas / RINA  Det Norske Veritas (DNV), Certification Notes no. 2.4.; «Environment test specification for Instrumentation and Automation Equipment» Optional EMC requirements:  Det Norske Veritas (DNV) Supplementary EMC and Environmental Testing. Technical Report No.2003-3124 Revision No.01  IEC 60945, Fourth edition, 2002-08  EN50081-1 / EN50082-2 (CENELEC, Harmonized standards)