Method of communicating between control devices of a load control system
First Claim
1. A method of communicating a message signal from a first control device to a second control device, the method comprising the steps of:
- transmitting the message signal from the first control device;
receiving the message signal at the second control device;
sampling the received message signal;
producing a set of N sequential samples;
determining the median of the N sequential samples; and
providing the median as an output sample.
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Accused Products
Abstract
A load control system for controlling the amount of power delivered to an electrical load from an AC power source includes a load control device and a remote control device. The load control device is operable to control the amount of power delivered to the electrical load in response to control signals transmitted by the remote control device. The remote control device may transmit the control signals to the load control device via current carrier control signals, radio-frequency control signals, or infrared control signals, which may be corrupted by noise during transmission. The received control signals are sampled and filtered by a multi-pass median filter, which substantially eliminates the noise corruption. Specifically, the multi-pass median filter repeatedly examines a set of N sequential samples of the received message signal, determines the median of the N sequential samples, and provides the median as an output sample.
90 Citations
28 Claims
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1. A method of communicating a message signal from a first control device to a second control device, the method comprising the steps of:
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transmitting the message signal from the first control device;
receiving the message signal at the second control device;
sampling the received message signal;
producing a set of N sequential samples;
determining the median of the N sequential samples; and
providing the median as an output sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of filtering a received message signal comprising a sequence of samples, the method comprising the steps of:
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examining a set of N sequential samples of the received message signal;
determining the median of the N sequential samples;
providing the median as an output sample; and
repeating the steps of examining a set of N sequential samples, determining the median, and providing the median. - View Dependent Claims (14)
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15. A control device for use in a load control system for controlling the amount of power delivered to an electrical load from an AC power source, the control device comprising:
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a receiver operable to receive a message signal;
a controller coupled to the receiver, the controller operable to;
sample the received message signal to produce a sampled signal;
execute a median filter on the sampled signal to produce a median-filtered output signal; and
process the median-filtered output signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A load control system for controlling the amount of power delivered to an electrical load from an AC power source, the control device comprising:
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a first control device including a transmitter operable to transmit a message signal; and
a second control device including a receiver operable to receive a message signal and a controller coupled to the receiver, the controller operable to sample the received message signal to produce a sampled signal, execute a median filter on the sampled signal to produce a median-filtered output signal, and process the median-filtered output signal. - View Dependent Claims (26, 27, 28)
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Specification