Telephone communications system with portable handsets

Details Telephone communications system with portable handsets Telephone communications system with portable handsets

1987-01-28

1988-10-04

Lev, Robert

Telephonic communications

Audio message storage, retrieval, or synthesis

379 91, 379144, 379 56, H04Q 704

Patent

active

047760001

ABSTRACT:
This is a telephone communications system having at least one fixed terminal connected by at least one subscriber's line to a telephone exchange and a plurality of portable handsets, the fixed terminal and the portable handsets having infrared transmitters and receivers for exchanging unit charging information and sound data information, the fixed terminal transmitting to a given handset unit charging signals received from the telephone exchange during a call, each portable handset accommodating a support for a programmable read-only memory and logic circuit for deducting from the programmable read-only memory unit charges corresponding to the unit charging signals transmitted by the terminal, each portable handset further transmitting a pay signal to the fixed terminal after having deducted the unit charge fee from the programmable read-only memory, and the fixed terminal further arranged for cutting off the call in case of failure to receive a pay signal after having transmitted a unit charging signal, interference between portable units being avoided by the use of time multiplexed bursts of pulses.

REFERENCES:
patent: 4275385 (1981-06-01), White
patent: 4439636 (1984-03-01), Neukirk et al.
patent: 4456793 (1984-06-01), Baker et al.
patent: 4523087 (1985-06-01), Benton
patent: 4587379 (1986-05-01), Masuda
patent: 4640986 (1987-02-01), Yotsutani et al.
patent: 4650981 (1987-03-01), Foletta

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