Title:
CORDLESS TELEPHONE SET
Document Type and Number:
Japanese Patent JP3026529
Kind Code:
B2
Abstract:
PURPOSE: To always use a cordless telephone set even when any equipment to always transmit the same noise frequency as a control channel signal is existent by performing control by means of intermittently transmitting/receiving plural frequencies as the control channel signals.
CONSTITUTION: When a mobile equipment 3 receives the control signal with a control channel circuit 9 and responds to it, a calling signal is sent from a control channel circuit 5, after the mobile equipment 3 receives this signal and confirms the ID, a speech channel is confirmed, a bell 12 is rung, and the speaking operation is performed by offhook. When the both frequencies or either of the frequencies are/is detected, an intermi detection circuit 15 investigates whether the interval of incoming output signals is any value decided in advance or not and when they are coincident, the detecting operation is continue until the time-out. When they are discordant within the detecting operation period of time, the control channel signals are sent from oscillation circuits 5a and 5a' inside the control channel circuit 5 through an antenna 7, and the connection with the mobile equipment 3 is operated.
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Inventors:
Hideo Tanaka
Akihito Nakamura
Akihito Nakamura
Application Number:
JP32179092A
Publication Date:
March 27, 2000
Filing Date:
December 01, 1992
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H04W76/02; H04B7/26; H04W76/00; H04W84/02; H04W84/10; H04W88/02; (IPC1-7): H04Q7/38; H04B7/26
Domestic Patent References:
| JP4267600A | ||||
| JP373628A | ||||
| JP226133A |
Attorney, Agent or Firm:
Takashi Homma