Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-07-07
1977-05-24
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
340 44, 340407, 340408, G01S 956, G08G 107, G08G 1095
Patent
active
040259226
ABSTRACT:
A traffic control system particularly suitable for aiding the blind includes an interrogating FM radio transmitter-receiving unit, which can be incorporated into a cane or the like, and a responding FM radio receiver-transmitter unit operatively associated with the traffic signal light control circuits at a street intersection. The interrogating unit transmits an FM signal modulated by a coded signal indicative of which direction its blind operator wishes to cross the intersection. The responding unit, in response to the FM signal received from the interrogating unit, transmits an FM signal modulated by a coded signal corresponding to that received from the interrogating unit whenever the traffic signal light conditions are such that a safe crossing in the desired direction is possible. The interrogating unit produces an audio or mechanical output signal when the coded signal received from the responding unit corresponds to the coded signal it transmitted under the control of its blind operator, this output signal indicating that it is safe to cross the intersection in the desired direction.
REFERENCES:
patent: 2461448 (1949-02-01), Smith
patent: 2496639 (1950-02-01), Richardt, Jr. et al.
patent: 2690547 (1954-09-01), Marks et al.
patent: 3158851 (1964-11-01), Ruthven
Frank William F.
Grote Stanley G.
Hubler Malcolm F.
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