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Title:
MESSAGE COMMUNICATION SYSTEM
Document Type and Number:
Japanese Patent JPH07303271
Kind Code:
A
Abstract:

PURPOSE: To improve the reliability of a system communicating the packet of data through an FM system.

CONSTITUTION: The radio communication system transmitting the packet of data to a moving receiver through an FM radio signal is provided. The strength of the radio signal is spatially changed, and a maximum value part and a minimum value part are generated in RF field strength. Namely, the continuation time of the data packet is made shorter than the half of the continuation time of the maximum value part. The respective packets are transmitted for plural times, and plural transmitters are provided. When the receiver detects low signal strength, the receiver is switched to the other channels.


Inventors:
GIYASUKIRU GARORUDO BII
PAAKU DANIERU JIEE
RUURUMAN ROBAATO JII
ROOZU DONARUDO TEII
SUTAIRII JIYOSEFU EFU ZA SAADO
BAANAMU RUISU DABURIYUU
HOFU DON JII
Application Number:
JP1995000112930
Publication Date:
November 14, 1995
Filing Date:
May 11, 1995
Export Citation:
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Assignee:
SEIKO CORP
SEIKO EPSON CORP
International Classes:
H01Q1/22; G04G5/00; G04G21/04; G04G99/00; G08B3/00; G08B3/10; G08B5/22; H01Q1/00; H01Q1/27; H01Q1/44; H04B7/24; H04H20/88; H04L12/56; H04L29/06; H04M3/42; H04M11/02; H04W52/02; H04W68/00; H04W84/02; H04W88/02; H04W88/18; H04L1/18; H04W8/18; H04W8/26; H04W28/06; H04W40/02; H04W72/04; H04W74/04; H04B; (IPC1-7): H04Q7/06; H04Q7/08; H04Q7/12; H04Q7/14
Domestic Patent References:
JPS494412A1974-01-16
Attorney, Agent or Firm:
Akihide Sugimura (1 outside)