Title:
RADIO TYPE ABNORMALITY MONITOR EQUIPMENT
Document Type and Number:
Japanese Patent JP3133522
Kind Code:
B2
Abstract:
PURPOSE: To improve the stability and the reliability by exchanging information between a monitor device like a receiver or a repeater and a detector like a fire sensor installed in the field by radio transmission using the spectrum spread communication.
CONSTITUTION: A repeater 3 is provided with a reception antenna 11, an SS reception part (spectrum spread reception part) 12, a PN sequence generator 13, and a control part 14 using a CPU. The SS reception part 12 uses the pseudo-random sequence signal generated by the PN sequence generator 13 to demodulate the reception signal received by the reception antenna 11. When a fire detection signal subjected to spectrum spread modulation is received from one of fire sensors 4a to 4n, data bits are outputted as a self-correlation peak value at the time of coincidence between the pseudo-random sequence included in the reception signal, and a reference pseudo-random sequence generated by the PN sequence generator 13, and the control part 14 restores original fire detection information based on data bits outputted from the reception part 12.
Inventors:
Terumasa Aratani
Application Number:
JP31177192A
Publication Date:
February 13, 2001
Filing Date:
November 20, 1992
Export Citation:
Assignee:
Hochiki Co., Ltd.
International Classes:
G08B25/10; H04J13/00; (IPC1-7): G08B25/10; H04J13/00
Domestic Patent References:
| JP5266369A | ||||
| JP6077135U |
Attorney, Agent or Firm:
Susumu Takeuchi (1 person outside)