Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1992-01-06
1994-05-24
Chin, Stephen
Telephonic communications
Audio message storage, retrieval, or synthesis
379 64, 379167, 379420, 455 33, H04M 1100, H04M 900, H04M 160, H04H 100
Patent
active
053156390
ABSTRACT:
A "wireless" door answering intercom system (meaning no special wiring between the inside and outside stations) that allows a visitor to carry on a two-way conversation with a person inside the building without requiring the visitor to manipulate a "push-to-talk" button. The transmitter and receiver at the outside door are on all the time, powered by connections to the existing A.C. power system in the building. The outside transmitter and receiver operate on separate carrier frequencies or frequency bands, the receiver on Channel 1 and the transmitter on Channel 2. The inside answering station includes a transmitter on Channel 1 and a receiver on Channel 2. The inside station has a spring loaded "push-to-talk" switch. This switch is normally biased to connect the inside answering station speaker/microphone to the output of the Channel 2 receiver, so that anything said at the outside door station can be heard at the inside answering station. When the "push-to-talk" switch is pushed, it connects the inside loudspeaker to the Channel 1 transmitter, and the speaker functions as a microphone, so that whatever is said at the inside answering station is heard at the outside door station.
REFERENCES:
patent: 4715060 (1987-12-01), Lipscher et al.
patent: 5008954 (1991-04-01), Oppendahl
patent: 5125026 (1992-06-01), Holcombe
patent: 5148468 (1992-09-01), Marrick et al.
Chin Stephen
Clement James W.
Shankar Vijay
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