Emergency vehicle detector
First Claim
1. In a radar detector having means for detecting the presence of a radio frequency signal within a preselected frequency band and means for generating an alert thereto, wherein in the improvement, the detecting means includes means for distinguishing at least two discrete radio frequency signals each of which is fixed at a different frequency within the preselected frequency band and means for generating a modified alert upon detecting and distinguishing the discrete signals, wherein the discrete signals are fixed so as to differ in frequency by at least 40 MHz.
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Accused Products
Abstract
An emergency vehicle contains a transmitter for generating and transmitting a pair of fixed continuous wave signals which are distinguishable from each other in a preselected frequency band. A passenger vehicle contains a receiver which detects and distinguishes the pair of signals and generates an alert if the signals are determined to be at predetermined frequencies.
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Citations
6 Claims
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1. In a radar detector having means for detecting the presence of a radio frequency signal within a preselected frequency band and means for generating an alert thereto, wherein in the improvement, the detecting means includes means for distinguishing at least two discrete radio frequency signals each of which is fixed at a different frequency within the preselected frequency band and means for generating a modified alert upon detecting and distinguishing the discrete signals, wherein the discrete signals are fixed so as to differ in frequency by at least 40 MHz.
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2. A system for emergency vehicle detection, comprising:
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transmitter means mounted in an emergency vehicle for generating and transmitting a pair of radio frequency signals each fixed in a preselected frequency band and separated by a distinguishable amount, wherein the transmitter means includes means for selecting from a plurality of pairs of radio frequency signals, each pair being uniquely separated by a distinguishable amount; receiver means carried in a second vehicle for detecting the pair of signals and for distinguishing the one signal from the other signal; and means for generating an alert upon detecting and distinguishing the pair of signals. - View Dependent Claims (3, 4, 5, 6)
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Specification