Communications: electrical – Override of traffic control indicator by command transmitter
Patent
1991-06-24
1993-02-16
Ng, Jin F.
Communications: electrical
Override of traffic control indicator by command transmitter
340901, 340902, 340904, G08G 107
Patent
active
051874768
ABSTRACT:
An optical traffic preemption detector detects pulses of light emitted by an approaching emergency vehicle and provides an output signal which is processed by a phase selector. The phase selector can request a traffic signal controller to preempt a normal traffic signal sequence to give priority to the emergency vehicle. A detector assembly is mounted in proximity to an intersection and can have multiple detector channels. A detector channel can have multiple photocells. Each photocell is provided with a rise time filter. If a detector channel has more than one photocell, the outputs of the respective rise time filters are coupled together. An output of a rise time filter, or coupled rise time filters, is first applied to a current-to-voltage converter and then a band pass filter. The band pass filter isolates a decaying sinusoid signal from a signal representative of a pulse of light. The decaying sinusoid signal is processed to produce a detector channel output signal that has a number of pulses for each pulse of light.
REFERENCES:
patent: 2620470 (1952-12-01), Rather, Jr. et al.
patent: 4162477 (1979-07-01), Munkberg
patent: 4806931 (1989-02-01), Nelson
Barte William B.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Ng Jin F.
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