Wake up device for communications system
First Claim
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1. A radio communications system comprising:
- a master receiver circuit having a sleep mode and an active mode, the master receiver circuit being configured to consume less power in the sleep mode than in the active mode;
a switch circuit configured to control when the master receiver circuit switches between the sleep mode and the active mode;
a receiver input configured to receive radio signals; and
a wake-up detector circuit, coupled to the receiver input, including;
circuitry configured to reject any of said radio signals not having a data rate equal to a predetermined first data rate, and to generate a wake-up mode signal when the receiver input receives a radio signal having a data rate equal to said first data rate;
wherein the switch circuit switches the master receiver from the sleep mode to the active mode in response to the data rate detector circuit generating said wake-up mode signal; and
wherein the switch circuit does not switch the master receiver from the sleep mode to the active mode in response to the receiver input receiving a radio signal having a data rate not equal to said first data rate.
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Abstract
The present invention teaches a communications system comprising a first communications device for receiving data and a wake up signal. The first communications device comprises an active mode of operation and a sleep mode of operation for reducing power consumption. Further, the system comprises means for switching the first communications device to and from sleep mode in response to receiving the wake up signal. Further, the system comprises a second communications device for transmitting data to the first device during its active mode, while transmitting the wake up signal to the first device during its sleep mode.
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Citations
15 Claims
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1. A radio communications system comprising:
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a master receiver circuit having a sleep mode and an active mode, the master receiver circuit being configured to consume less power in the sleep mode than in the active mode;
a switch circuit configured to control when the master receiver circuit switches between the sleep mode and the active mode;
a receiver input configured to receive radio signals; and
a wake-up detector circuit, coupled to the receiver input, including;
circuitry configured to reject any of said radio signals not having a data rate equal to a predetermined first data rate, and to generate a wake-up mode signal when the receiver input receives a radio signal having a data rate equal to said first data rate;
wherein the switch circuit switches the master receiver from the sleep mode to the active mode in response to the data rate detector circuit generating said wake-up mode signal; and
wherein the switch circuit does not switch the master receiver from the sleep mode to the active mode in response to the receiver input receiving a radio signal having a data rate not equal to said first data rate. - View Dependent Claims (2, 3, 4)
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5. A method of changing a radio communications receiver from a sleep mode to an active mode, comprising:
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providing a radio communications receiver having a sleep mode and an active mode, wherein the receiver continuously and uninterruptibly consumes less electrical power in the sleep mode than in the active mode;
receiving radio signals at an input of the receiver;
filtering said radio signals received in the receiving step so as to reject any of said radio signals not having a data rate equal to a predetermined first data rate;
while the receiver is in the sleep mode, detecting when the receiver receives a radio signal that has a data rate equal to said first data rate and that is not rejected by the filtering step; and
switching the receiver from the sleep mode to the active mode in response to detecting said first data rate. - View Dependent Claims (6, 7, 8)
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9. A radio communications system comprising:
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a receiver having a sleep mode and an active mode such that, in operation, the receiver consumes less power in the sleep mode than in the active mode;
a receiver input for receiving radio signals; and
a wake-up detector circuit coupled to the receiver input including;
circuitry that rejects any of said radio signals not having data rate equal to a predetermined, first data rate, and that generates a wake-up mode signal only when the receiver input receives a radio signal having a data rate equal to said first data rate;
wherein the receiver is configured to switch from the sleep mode to the active mode in response to the data rate detector circuit generating said wake-up mode signal. - View Dependent Claims (10, 11, 12)
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13. A method of changing a radio communications receiver from a sleep mode to an active mode, comprising:
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providing a receiver having a sleep mode and an active mode, wherein, in operation, the receiver continuously consumes less electrical power in the sleep mode than in the active mode;
receiving radio signals at an input of the receiver;
rejecting any of said radio signals not having a data rate equal to a predetermined first data rate;
while the receiver is in the sleep mode, continuously maintaining the receiver in the sleep mode until the receiver receives a radio signal that has a data rate equal to said first data rate and that is not rejected;
while the receiver is in the sleep mode, detecting when the receiver receives a radio signal that has a data rate equal to said first data rate and that is not rejected; and
switching the receiver from the sleep mode to the active mode in response to detecting said first data rate. - View Dependent Claims (14, 15)
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Specification