Control circuit for mobile telephone with full duplex operation

Details Control circuit for mobile telephone with full duplex operation Control circuit for mobile telephone with full duplex operation

1987-07-16

1989-03-07

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379 56, H04M 908

Patent

active

048113905

ABSTRACT:
A circuit which is used with a portable or mobile telephone system. The circuit is arranged to be installed between the telephone control unit and the radio transceiver used in mobile telephone systems. The circuit permits "normal" telephone usage with the telephone handset, as well as "hands-free" or speaker-phone operation. Also, duplex (i.e. bidirectional) operation is achieved by reducing, but not eliminating, two-way signal transmission through the circuit.

REFERENCES:
patent: 4715063 (1987-12-01), Haddad et al.

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