Monitoring apparatus using telephone link

Details Monitoring apparatus using telephone link Monitoring apparatus using telephone link

1987-04-09

1988-08-09

George, Keith E.

Telephonic communications

Emergency or alarm communications

Personal monitoring

379106, 379389, H04M 1104, H04M 160

Patent

active

047633492

ABSTRACT:
Two-way telephone communication is established between a subscriber-dwelling and a remote station using the automatic dialer of existing security apparatus. A speaker and a microphone are placed in the dwelling. A diplexer electrically coupled to the automatic dialer and responsive to a tone of a given frequency, operates a switch which selectively applies either the microphone or the speaker to the audio circuitry of the dialer. When the dialer is triggered, the switch couples the microphone to the audio circuitry of the dialer whereby sounds in the dwelling are communicated to the remote station. When an employee at the remote station applies the tone to the link, the diplexer causes the switch electrically to isolate the microphone and couple the speaker to the dialer whereby the employee of the station can communicate with the dwelling. Alternate operation of either the speaker or microphone prevents accoustical feedback between the two.

REFERENCES:
patent: 3725585 (1973-04-01), Moniak et al.
patent: 3800089 (1974-03-01), Reddick
patent: 3985976 (1976-10-01), Cowpland et al.
patent: 4172967 (1979-10-01), Porter et al.
patent: 4338493 (1982-07-01), Stenhuis et al.
patent: 4467142 (1984-08-01), Rupp et al.
Lennstrom et al., "Ericare", Ericsson Review, vol. 58, No. 2, 1981, pp. 96-100, received by PTO 12/15/81.

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