Horn honker interface

Details Horn honker interface Horn honker interface

1990-09-04

1993-05-18

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

3403111, 340384R, 455345, G08B 300

Patent

active

052128164

ABSTRACT:
An audible interface device for each of a plurality of mobile units equipped with a radio dispatch system operated by a computer is provided. The device consists of a mechanism for detecting a voltage drop in the data PTT line of the computer when a transmission is sent exclusively from a base station to the mobile unit. This actuates an audible signaling member for a predetermined time interval to indicate to a person at the mobile unit that the transmission has been sent exclusively thereto.

REFERENCES:
patent: 4162479 (1979-07-01), Nickell et al.
patent: 4383249 (1983-05-01), Frigo
patent: 4866415 (1989-09-01), Obayashi et al.
patent: 4962528 (1990-10-01), Herrera

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