Title:
RADIO COMMUNICATION DEVICE
Document Type and Number:
Japanese Patent JP3570368
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To enable a radio communication device to avoid the effect of interference electromagnetic waves on it by accurately detecting the periodicity of interferential electromagnetic waves emitted from a microwave oven or the like, where the radio communication device makes radio communications by use of a built-in power supply without using a commercial power supply.
SOLUTION: A receiving circuit 3 and a transmission circuit 4 are connected to a transmitting/receiving antenna 1 through a transmitting/receiving switching circuit 2, a frequency synthesizer 15 is provided, RSSI signals detected by the receiving circuit 3 and frequency division signals outputted from the variable frequency dividing circuit 28 which divides master clocks, gradually increasing a division ratio are compared with each other with a comparator 29, and when it is found that the RSSI signals and the frequency division signals are matched with each other, radiation periodic signals synchronizing with interference electromagnetic waves are fed from a period decision circuit 30 to a receiving data processing part 21, a frequency hopping controlling part 22, a transmission data processing part 23, and a power supply control unit 25 so as to move control signals ensuring communication connection to a frequency band where the control signals are kept free from the effect of the interferential electromagnetic waves, and data are transmitted or received in an interval in which no interference waves are radiated.
Inventors:
Norio Hama
Application Number:
JP2000300467A
Publication Date:
September 29, 2004
Filing Date:
September 29, 2000
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
H04J13/00; H04B1/10; H04B1/715; H04B7/26; H04B15/00; H04B17/309; H04B17/382; H04W72/02; H04W84/12; H04W88/02; (IPC1-7): H04B15/00; H04B7/26; H04J13/00; H04L12/28
Domestic Patent References:
| JP2000013334A | ||||
| JP11112441A | ||||
| JP6120847A |
Other References:
トランジスタ技術増刊 トラ技ORIGINAL,CQ出版社,1992年 1月 1日,No.8,139
奥村善久 進士昌明,移動通信の基礎,電子情報通信学会,1997年 6月 1日,初版第9刷,285
奥村善久 進士昌明,移動通信の基礎,電子情報通信学会,1997年 6月 1日,初版第9刷,285
Attorney, Agent or Firm:
Masahiko Ueyanagi
Osamu Suzawa
Osamu Suzawa