Cordless telephone
First Claim
1. A cordless telephone comprising:
- a single master station connected to a telephone line and a plurality of hand sets, each preset to different transmitting and receiving frequencies, and each able to communicate with said master station by radio;
master station receiving means having a variable receiving frequency and including a call receiving circuit tunable to a transmitting frequency of any of said hand sets, and a call transmitting circuit tunable to a receiving frequency of said any hand set,frequency selecting means for changing said receiving frequency of said master station receiving means so that said receiving frequency may be selectively tuned to the transmitting frequency of each of said hand sets,said hand sets each comprising hand set transmitting means for transmitting an information signal representing the operation state and service demands of each hand set, andsaid master station further comprising monitor receiving circuit means having a variable receiving frequency, said monitor receiving circuit being successively tuned to said preset frequencies of each of said plurality of hand sets, said monitor receiving circuit means performing monitoring and communication with each of said hand sets for determining operation states and service demands thereof.
2 Assignments
0 Petitions
Accused Products
Abstract
A master station 1 is connected with a telephone line 2. For this master station 1, a plurality of hand sets are provided. Each hand set is set to different transmitting and receiving frequencies to communicate with the master station 1. Each hand set generates from an information signal generating circuit 35, an information signal representing the operation state of the hand set and transmits the information signal by a transmitting circuit 37. The master station 1 receives the information signal through a monitor receiving circuit 4. The monitor receiving circuit 4 has a receiving frequency which changes cyclically to be tuned successively to all the transmitting frequencies of the respective hand sets. Accordingly, the monitor receiving circuit 4 receives successively the information signals from the respective hand sets. The received information signals are detected by a second detecting circuit 10 and a third detecting circuit 11 to be supplied to a control circuit 3. The control circuit 3 stores the information signals in a status table of a RAM 18. Consequently, by referring to this status table, the operation states of the respective hand sets can be determined.
45 Citations
10 Claims
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1. A cordless telephone comprising:
- a single master station connected to a telephone line and a plurality of hand sets, each preset to different transmitting and receiving frequencies, and each able to communicate with said master station by radio;
master station receiving means having a variable receiving frequency and including a call receiving circuit tunable to a transmitting frequency of any of said hand sets, and a call transmitting circuit tunable to a receiving frequency of said any hand set, frequency selecting means for changing said receiving frequency of said master station receiving means so that said receiving frequency may be selectively tuned to the transmitting frequency of each of said hand sets, said hand sets each comprising hand set transmitting means for transmitting an information signal representing the operation state and service demands of each hand set, and said master station further comprising monitor receiving circuit means having a variable receiving frequency, said monitor receiving circuit being successively tuned to said preset frequencies of each of said plurality of hand sets, said monitor receiving circuit means performing monitoring and communication with each of said hand sets for determining operation states and service demands thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a single master station connected to a telephone line and a plurality of hand sets, each preset to different transmitting and receiving frequencies, and each able to communicate with said master station by radio;
Specification