Digital cordless telephone systems

Details Digital cordless telephone systems Digital cordless telephone systems

1990-05-07

1991-08-20

Tarcza, Thomas H.

Pulse or digital communications

Repeaters

Testing

H04B 1500

Patent

active

050420500

ABSTRACT:
A digital cordless telephone system which comprises a primary station (PS) controlled by a system controller (14 or 15) and a plurality of secondary stations (SS) capable of communicating with the primary station by way of a time division duplex radio link, the primary and/or secondary station having means to generate a beacon signal which is receivable by a secondary station outside the range of normal speech communication and the beacon signal comprising a low bit rate signal which is transmitted at a power comparable to the digitized speech signal. In one embodiment the beacon signal is recovered using a narrowband filter and a demodulator. In another embodiment direct sequence spread spectrum techniques are used to send the beacon signal and a correlator/matching circuit is used to recover the low bit rate data representative of the beacon signal.

REFERENCES:
patent: 4866732 (1989-09-01), Carey et al.

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