Television door intercom apparatus

Details Television door intercom apparatus Television door intercom apparatus

2006-03-21

2006-03-21

Rao, Andy (Department: 2613)

Television

Special applications

Observation of or from a specific location

C348S143000

Reexamination Certificate

active

07015946

ABSTRACT:
A television door intercom apparatus improves recognition performance for a resident inside a house to recognize a visitor conducting a call operation at the entrance and security in responding to the call. A call detection circuit31of a residential master station2detects a call when a visitor pushes a call button11of a door intercom substation1, activates a signal generator circuit32and causes a master station speaker39to output a call sound so that a communication can be exchanged between a substation microphone16and a substation speaker17of the door intercom substation and a master station microphone38and the master station speaker of the residential master station. When a picture monitor36of the residential master station displays a picture taken by a camera13of the door intercom substation, the residential master station further includes a message transmission circuit34activated when the call detection circuit detects the call, for causing the substation speaker to output a message content of a message storage circuit33storing in advance a predetermined message.

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patent: 6624750 (2003-09-01), Marman et al.
patent: 04-130852 (1992-01-01), None

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