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US 5,473,668 AGranted
Digital cordless telephone system readily capable of setting up
AssigneeNEC Corporation
InventorToru Nakahara
Life of this patent
Estimating the term…
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AssigneeNEC Corporation
InventorToru Nakahara
Estimating the term…
In a digital cordless telephone system including master and slave radio stations that are operable in response to first and second frame synchronization signals synchronized with each other to produce first and second TDMA signals in the form of radio signals, respectively, a timing signal whch is produced on the basis of the first frame synchronization signal by the master radio station is transmitted to the slave radio station through a signal line to synchronize the slave radio station with the master radio station and is received by the slave radio station after lapse of a time delay determined by a length of the signal line. The timing signal is delayed in the master radio station by a single period of the first frame synchronization signal to produce the first TDMA signal synchronized with the delayed timing signal while the timing signal received with the time delay by the slave radio station is timed by the second frame synchronization signal to produce an output synchronization signal synchronized with the second frame synchronization signal and to obtain the second TDMA signal timed by the output synchronization signal. As a result, the first and the second TDMA signals are produced at an instant coincident with each other. The timing signal may be a TDMA frame synchronization signal.
A digital cordless telephone system comparising a master radio station connected through an exchange to a public telephone network and a slave radio station which is connected to said master radio station through a transmission line and which is also connected to said exchange station, said master radio station being for converting a first reception signal received from said exchange station into a first TDMA signal which is transmitted in the form of a first radio signal from said master radio station while said slave radio station is for converting a second reception signal received from said exchange station into a second TDMA signal which is transmitted in the form of a second radio signal from said slave radio station, the first and the second reception signals including first and second frame synchronization signals, respectively, while the first and the second TDMA signals include first and second TDMA frame sychronization signals produced from the first and the secondd frame synchronization signals, respectively;
A master radio station responding to a reception signal sent from an exchange station to produce a TDMA signal in the form of a radio signal and a synchronization timing control signal through a transmission line, said reception signal including a frame sychronization signal having a frame period and a data signal while said TDMA signal includes a TDMA frame synchronization signal based on said frame synchronization signal, said master radio station comprising:
A slave radio station supplied with a reception signal and a synchronization timing control signal to produce a TDMA signal in the form of a radio signal, said reception signal including a frame synchronization signal having a frame period and a data signal while said TDMA signal includes a TDMA frame synchronization signal based on said frame synchronization signal, said slave radio station comprising:
Dependencies are inferred from the claim text.