Visitor conversation system

Details Visitor conversation system Visitor conversation system

1983-05-09

1985-12-10

Brigance, Gerald L.

Communications: electrical

External condition vehicle-mounted indicator or alarm

Transmitter in one vehicle only

179 37, 367 93, G08B 700

Patent

active

045583218

ABSTRACT:
A novel visitor conversation system comprising a single transmitter-receiver. The distance to an incoming person is measured by receiving an ultrasonic wave signal propagated from the transmitter-receiver and reflected on the person. When the distance is shorter than a predetermined detection distance, it is decided that the person is a visitor. The transmitter-receiver further propagates an ultrasonic wave amplitude-modulated on an audio signal, and the signal received is demodulated for the purpose of a speech. The visitor detection and the conversation with a vehicle carrying a speaking device are performed by a single medium.

REFERENCES:
patent: 3231852 (1966-01-01), Kritz
patent: 3622957 (1971-11-01), Libengood et al.
patent: 3922672 (1975-11-01), Birt et al.
patent: 4039760 (1977-08-01), Gregory et al.
patent: 4203160 (1980-05-01), Doherty

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