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1. (WO2017036304) DISTRIBUTED OPTICAL FIBER PERIMETER SECURITY SYSTEM, AND SOUND RESTORATION SYSTEM AND METHOD

Pub. No.:    WO/2017/036304    International Application No.:    PCT/CN2016/095649
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Aug 18 01:59:59 CEST 2016
IPC: G08B 13/00
G08B 13/186
Applicants: NUCTECH COMPANY LIMITED
同方威视技术股份有限公司
Inventors: WEI, Yufeng
魏宇峰
YAO, Kai
姚锴
XU, Jun
徐骏
YANG, Jie
杨捷
GAO, Baisong
高柏松
XU, Huikang
徐惠康
XIAO, Hang
肖航
XU, Ming
许明
LIU, Yunfei
刘云飞
DONG, Kun
董坤
MAO, Xianhui
毛献辉
Title: DISTRIBUTED OPTICAL FIBER PERIMETER SECURITY SYSTEM, AND SOUND RESTORATION SYSTEM AND METHOD
Abstract:
A distributed optical fiber perimeter security system, and sound restoration system and method. The sound restoration system is applied to the distributed optical fiber perimeter security system monitoring several protection areas. The sound restoration system comprises: a laser generation mechanism (11) for providing a laser signal; a beam splitting mechanism (12) for splitting the laser signal into multiple input optical signals; a plurality of optical fiber Michelson interferometer mechanisms (13) corresponding to each of the protection areas, wherein each of the optical fiber Michelson interferometer mechanisms (13) receives an input optical signal and outputs, in response to a surrounding sound pressure, an interference signal; and an audio output mechanism (14) for receiving the interference signal and when an alarm signal of any of the protection areas is received, outputting an audio signal restored according to the interference signal of the protection area. The system can help a user make a further confirmation and determination on an occurrence of abnormal events such as intrusions.