Communication apparatus

Details Communication apparatus Communication apparatus

1995-02-24

1998-02-24

Pham, Chi H.

Telecommunications

Transmitter and receiver at same station

Transceiver controlling a separate transceiver or receiver

455 68, 455 70, H04B 140

Patent

active

057220549

ABSTRACT:
A communication apparatus comprising a detector for detecting a standard DTMF signal when a clock of a predetermined frequency is supplied, an operating unit for executing an operation such as display or communication according to a detection output of the detector to which a clock other than the predetermined frequency was supplied, and a supply unit for supplying the clock other than the predetermined frequency to the detector.

REFERENCES:
patent: 4885763 (1989-12-01), O'Brien et al.
patent: 4996708 (1991-02-01), Kakizawa
patent: 5093857 (1992-03-01), Yoshida et al.
patent: 5165096 (1992-11-01), Matsumoto
patent: 5222126 (1993-06-01), Nishino
patent: 5317629 (1994-05-01), Watanabe
patent: 5375163 (1994-12-01), Kamimoto et al.

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