Title: Device for measuring noise of railway
Application Number: 200520123904 Application Date: 2005.12.09
Publication Number: 000000000 Publication Date:
Approval Pub. Date: 2007.01.03 Granted Pub. Date: 2007.01.03
International Classifi-cation: G01H17/00
Applicant(s) Name: Tianjin Xianwei Railway Electronic Equipment Co., Address:
Inventor(s) Name: Ma qian;Teng Zhiqiang;Xu Jianfeng;Mao Baochen;Li W
Attorney & Agent: wang laijia
Abstract:
    This utility model belongs to a railway noisy detection device, wherein, the control circuit is comprised of a distinguishing circuit, a switch power circuit, a coupling transformer, an audio frequency amplifying circuit, a dual audio frequency decoding circuit, a singlechip and a dual audio frequency coding circuit. The distinguishing circuit connects with the switch power circuit by a relay switch, and the singlechip connects the A/D conversion circuit. The distinguishing circuit connects with a pair of transmitting cables that are elicited from the casing. This utility model applies the computer-singlechip mode and dual audio frequency communication mode so as to supply the power and transmit the signals on one pair of wires. As it shares the wires with the loudspeaker, two pairs of wires can be saved in order to reduce the project workload and the materials, which also can be refitted on the existing foundation.
Time: 5