Telephone on-hook and off-hook sensing systems

Details Telephone on-hook and off-hook sensing systems Telephone on-hook and off-hook sensing systems

1996-05-31

1998-11-10

Chiang, Jack

Telephonic communications

Terminal

Switch or switch actuator structure

379447, H04M 100

Patent

active

058355855

ABSTRACT:
Hook conditions of a handset of a telephone apparatus which includes a telephone apparatus base having an inside and an outside are sensed by providing a beam of radiation outside of that telephone apparatus base. The handset is placed in that beam of radiation outside the telephone apparatus base in an on-hook condition of that handset on the telephone apparatus base. An off-hook condition of the handset is signaled by removing that handset from that beam of radiation while removing such handset from the telephone apparatus base. A method of preventing eavesdropping through microphone and earphone of a handset of a telephone apparatus opens a circuit of either the microphone or the earphone and short-circuits either the earphone or the microphone, respectively while the handset is on-hook on a base of that telephone.

REFERENCES:
patent: 2686844 (1954-08-01), Brewer
patent: 3413423 (1968-11-01), Stevko
patent: 4847900 (1989-07-01), Wakim
Optoelectronic Data Book 1991/1992 by Sharp Electronics Corporation pp. 119 to 121, pp. 964 to 965, Aug. 1988.
Relay Catalog of Omron Electronics, Inc. (1992) pp. 85 to 88
Photograph, Apr. 1996, of AT&T telephone apparatus base 3 sheets.

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