Low power rf control system
First Claim
1. A radio-frequency (rf) control system for operating a component at least in part in response to an rf signal from a remote control device manipulable by a user, comprising:
- at least one rf receiver associated with the component and configured for processing an rf signal; and
at least one controller associated with the component and controlling the receiver, wherein the controller adaptively adjusts a noise threshold above which a carrier must be detected to indicate the presence of a control signal,wherein a slow receiver signal strength indicator (RSSI) filter and a fast RSSI filter are connected between a RSSI output of the rf receiver and inputs of the controller, a time constant of the fast RSSI filter being less than a time constant of the slow RSSI filter,wherein the output of the fast RSSI filter is used by the controller to determine whether a carrier signal has been detected,wherein the output of the slow RSSI filter is connected to a comparator to provide a digital signal to the controller, andwherein the controller raises the noise threshold when the controller determines that a false carrier has been detected.
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Accused Products
Abstract
A low power rf control system includes a controller that operates at a low clock speed when an associated rf receiver is deenergized and a high clock speed when the controller energizes the receiver. The receiver can be on for a short period, off for a short period when no preamble pulses from a remote control device are received, on for a short period, and then off for a longer period until the next cycle. The receiver remains on to process a command signal when a preamble signal is detected. A DC-DC down converter can be used as a power supply for the receiver, and a SAW resonant circuit can be used as an IF oscillator for the receiver. An LC filter can be associated with the receiver for filtering the IF signal.
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Citations
20 Claims
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1. A radio-frequency (rf) control system for operating a component at least in part in response to an rf signal from a remote control device manipulable by a user, comprising:
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at least one rf receiver associated with the component and configured for processing an rf signal; and at least one controller associated with the component and controlling the receiver, wherein the controller adaptively adjusts a noise threshold above which a carrier must be detected to indicate the presence of a control signal, wherein a slow receiver signal strength indicator (RSSI) filter and a fast RSSI filter are connected between a RSSI output of the rf receiver and inputs of the controller, a time constant of the fast RSSI filter being less than a time constant of the slow RSSI filter, wherein the output of the fast RSSI filter is used by the controller to determine whether a carrier signal has been detected, wherein the output of the slow RSSI filter is connected to a comparator to provide a digital signal to the controller, and wherein the controller raises the noise threshold when the controller determines that a false carrier has been detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification