Title:
FIRE ALARMING DEVICE
Document Type and Number:
Japanese Patent JP3165252
Kind Code:
B2
Abstract:
PURPOSE: To enable polling transmission between a receiver and a terminal without requiring any address by utilizing a spectrum spread communication.
CONSTITUTION: Each of repeaters 14-1 to 14-n is provided with a pseudo-random series generation part 20 which generate a different and characteristic pseudo- random series previously assigned to the corresponding repeater, a reception part 22 which receives and demodulates a signal from the receiver 10 by using the pseudo-random series generated by the pseudo-random generation part 20, and a transmission part 24 which sends the signal from the repeater to the receiver 10 by using the pseudo-random series generated by the pseudo-random series. Further, the receiver 10 is provided with a pseudo-random series switching generation part 30 which generates one of the same plural pseudo-random series as the characteristic pseudo-random series set in the repeater by switching, a transmission part 34 which sends the signal from the receiver to the repeater side by using the pseudo-random series generated by the switching, and a reception part 36 which receives and demodulates the signal from the repeater by using the pseudo-random series generated by the switching.
Inventors:
Terumasa Aratani
Application Number:
JP20171892A
Publication Date:
May 14, 2001
Filing Date:
July 29, 1992
Export Citation:
Assignee:
Hochiki Co., Ltd.
International Classes:
G08B17/00; G08B25/00; G08B26/00; H04J13/00; H04J13/16; (IPC1-7): G08B17/00
Domestic Patent References:
| JP3276393A | ||||
| JP6116632A | ||||
| JP5334589A |
Attorney, Agent or Firm:
Susumu Takeuchi (1 person outside)