Method of saving power in communication devices
First Claim
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1. A power saving circuit for activating an electronic device with a sleep mode and a wake-up mode, comprising:
- a radio frequency receiver with low power consumption including;
a down-converter for reducing the frequency of a received signal;
a decoder for decoding a received radio frequency signal; and
an analyzer for detecting a predetermined identification code in said received radio frequency signal and activating said electronic device in response to detection of said predetermined identification code.
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Abstract
An electronic device with a power saving circuit incorporates a radio frequency receiver with low power consumption and including a frequency down converter. A functional device, which may be a high power radio receiver, is normally turned off during a period of inactivity. An analyzer detects a predetermined identification code in a received radio frequency signal and outputs a signal to turn on the functional device.
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Citations
23 Claims
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1. A power saving circuit for activating an electronic device with a sleep mode and a wake-up mode, comprising:
a radio frequency receiver with low power consumption including;
a down-converter for reducing the frequency of a received signal;
a decoder for decoding a received radio frequency signal; and
an analyzer for detecting a predetermined identification code in said received radio frequency signal and activating said electronic device in response to detection of said predetermined identification code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of saving power in a remote electronic device having a sleep mode and a wake-up mode, comprising:
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transmitting a radio frequency signal with an identification code;
receiving said radio frequency signal at said remote device in the sleep mode;
down-converting said received radio frequency signal;
decoding said down-converted received radio frequency signal; and
in response to detection of a predetermined identification code in said received radio frequency signal, switching said remote electronic device to the wake-up mode. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification