Detector apparatus
DCFirst Claim
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1. A method of operating a radar detector having a swept VCO to detect the presence of a receiver circuit, the method including the steps of:
- stopping the sweep of the VCO at a predetermined time;
tuning the VCO to emit a signal at a single fixed frequency for a predetermined time period;
detecting a signal having a changing frequency;
determining if said detected signal has a predetermined signal characteristic; and
in response to said determining step, if the detected signal has the predetermined signal characteristic then operating the VCO such that the VCO does not emit a signal which is detectable by the receiver circuit.
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Abstract
Apparatus for detecting the presence of a speed detection system includes a microcontroller, a laser detector circuit coupled to the microcontroller, a radar detector circuit coupled to the microcontroller and a display coupled to the microcontroller, wherein the microcontroller receives signals from the laser detector and radar detector circuits and in response to the signals fed thereto, the microcontroller provides an output signal indicating which of the laser and radar detector circuits fed a signal thereto.
83 Citations
18 Claims
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1. A method of operating a radar detector having a swept VCO to detect the presence of a receiver circuit, the method including the steps of:
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stopping the sweep of the VCO at a predetermined time; tuning the VCO to emit a signal at a single fixed frequency for a predetermined time period; detecting a signal having a changing frequency; determining if said detected signal has a predetermined signal characteristic; and in response to said determining step, if the detected signal has the predetermined signal characteristic then operating the VCO such that the VCO does not emit a signal which is detectable by the receiver circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radar detector having a circuit for detecting a signal having a changing frequency emitted by a receiver circuit, the circuit comprising:
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first means, coupled to a local oscillator signal source, said first means for periodically changing the frequency of a local oscillator signal emitted by the local oscillator signal source between a first frequency and a second different frequency; second means, coupled to said first means, said second means for stopping the sweep of the local oscillator signal source at a predetermined time during a predetermined one of the periodic sweeps such that the local oscillator signal source emits a signal at a single frequency for a predetermined time period; third means, coupled to said second means, said third means for detecting the signal having a changing frequency emitted by the receiver circuit; and fourth means, coupled to said third means, said fourth means for controlling the local oscillator signal source such that in response to said third means detecting the signal from the receiver circuit, said fourth means controls the local oscillator signal source such that the radar detector does not emit a signal detectable by the receiver circuit. - View Dependent Claims (10, 11, 12, 13)
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14. A radar detector comprising:
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a VCO; a tuning circuit, coupled to the VCO, said tuning circuit for providing a sweep signal to said VCO such that said VCO provides a signal which periodically sweeps between a first frequency and a second different frequency; a processor, coupled to said tuning circuit, wherein in response to a signal from said processor, said tuning circuit stops the sweep of said VCO at a predetermined time such that said VCO emits a signal at a single frequency for a predetermined time period; and a detector circuit, coupled to said processor, said detector circuit for detecting a signal having a predetermined signal characteristic, and wherein in response to said detector circuit detecting a signal having the predetermined signal characteristic, said tuning circuit stops the sweep signal and tunes said VCO to emit a signal having a frequency outside the frequency range between the first frequency and the second frequency. - View Dependent Claims (15, 16, 17, 18)
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Specification