Data communication apparatus and method with low power standby mode
First Claim
1. A process of data communication, the process including the steps of:
- a) transmitting a first signal having a first frequency for a first period of time and then transmitting a second signal having a second frequency for a second period of time, said second signal being modulated to represent data;
switching a receiver into a low power mode when no signal is received;
switching the receiver into a data communication mode when said first signal is received to enable the receiver to receive the second signal and extract data therefrom; and
switching the receiver back into the low power mode when said second signal is no longer received.
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Accused Products
Abstract
An apparatus and method for communication of data, the apparatus including a transmitter operable to transmit a first signal at a first frequency and a second signal at a second frequency. The second signal is modulated to represent data and the transmitter ends transmission of the second signal when the transmission of data is completed. The apparatus further includes a receiver switchable between a first frequency receive mode and a second frequency receive mode, the first frequency receive mode rendering the receiver operable to receive signals at the first frequency and the second frequency receive mode rendering the receiver operable to receive signals at the second frequency. The first frequency receive mode is a low power mode and the second frequency receive mode is a data communication mode. The apparatus also includes a device for switching the receiver into the low power mode, for switching the receiver into the data communication mode when said first signal is received, and for switching the receiver into the low power mode when transmission of said second signal is ended.
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Citations
14 Claims
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1. A process of data communication, the process including the steps of:
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a) transmitting a first signal having a first frequency for a first period of time and then transmitting a second signal having a second frequency for a second period of time, said second signal being modulated to represent data; switching a receiver into a low power mode when no signal is received; switching the receiver into a data communication mode when said first signal is received to enable the receiver to receive the second signal and extract data therefrom; and switching the receiver back into the low power mode when said second signal is no longer received.
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2. An apparatus for communication of data, the apparatus including;
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a) a transmitter operable to transmit a first signal at a first frequency and a second signal at a second frequency, the second signal being modulated to represent data; b) a receiver switchable between a first frequency receive mode and a second frequency receive mode, the first frequency receive mode rendering the receiver operable to receive signals at the first frequency and the second frequency receive mode rendering the receiver operable to receive signals at the second frequency, the first frequency receive mode being a low power mode and the second frequency receive mode being a data communication mode; c) switching means for switching the receiver into the low power mode, for switching the receiver into the data communication mode when said first signal is received, and for switching the receiver into the low power mode when said second signal is no longer received. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for receiving data from a transmitter, the apparatus including;
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a) a receiver switchable between a low power mode and a data communications mode, low power mode rendering the receiver operable to receive signals at a first frequency and the data communications mode rendering the receiver operable to receive signals at a second frequency; b) switching means for switching the receiver into the low power mode when no signal is received, for switching the receiver into the data communication mode when a first signal having said first frequency is received thereby enabling communication to ensue with signals having said second frequency, and for switching the receiver back into the low power mode when transmission of signals having said second frequency is no longer received.
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13. An apparatus for transmitting and receiving data to and from a remote device, the apparatus including;
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a) a receiver switchable between a low power mode and a data communications mode, low power mode rendering the receiver operable to receive signals at a first frequency and the data communications mode rendering the receiver operable to receive signals at a second frequency; b) transmitting means for transmitting communication signals at said second frequency to said remote device when said receiver is in said data communication mode; c) switching means for switching the receiver into the low power mode when no signal is received, for switching the receiver into the data communication mode when a first signal having said first frequency is received thereby enabling communication to ensue with signals having said second frequency, and for switching the receiver back into the low power mode when transmission of signals having said second frequency is no longer received. - View Dependent Claims (14)
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Specification