Tatung Telecom

Douglas D Lau

Abraham Y Chen

Carl Engelbrecht

Doug Jones

D Darryl Denton

Theresa A Foster

Temujin Kuechie

Andrew Hooper

Dean Amir Depay

Pay telephone

A method and apparatus provide for operating and locating a digital cordless telephone (DCT) handset among an integrated network of base stations. The present system utilizes a standard communication protocol to establish radio communication links between terminals and a network of base stations, where each base station is directly interfaced to a local exchange and is capable of providing access to the public and/or private telephone network. Each base station is a network node that contains a copy of a common database that may be updated, as needed, to provide current information on the location of individual terminals. The common database contains various information on each base station, each terminal, and the latest location of each terminal at a particular base station. Further, with the temporary attachment and use of a computer to a master base station in the network, the DCT system is capable of using the common database to register terminals, locate terminals, and allocate communication channels between terminals and base stations.

Method and apparatus for tracking location of wireless terminals in a

A cordless, battery-operated telephone of relatively low power consumption suitable to operate in license-exempt spectrum and which may employ an established communication protocol, such as the CT-2 communication protocol, is realized by providing a direct sequence spread spectrum (DSSS) modulator/spreader and demodulator/despreader in a battery-operated handset in connection with an intelligent CT-2 controller to which is added additional circuitry and functionality in the handset for acquiring, pulling-in and tracking, in both operational and low-power-consumption standby modes, a received DSSS signal from a base station unit. The additional functionality in the handset includes a PN phase discriminator with intelligent oversampling to deal with the time division duplex signals during synchronization, a second order delay lock loop for in-service mode tracking at a moderate loop iteration rate, and an extended-range discriminator and very narrow-band third-order delay lock loop for stand-by mode tracking at a very low loop iteration rate.

Wireless frequency-division-multiple-access direct sequence spread

A coin escrow device includes a housing for receiving coins, and first and second gates for selectively discharging coins to a coin return chute or to a coin collection chute. Actuating mechanisms are provided to selectively unlatch the gates and to bias the gates to their latched positions.

Escrow device for coin-operated systems

Growing community of inventors

Hillsborough, CA, United States of America

Douglas D Lau