Patent ID: 7876207

Claim:
A wake-up control device comprising: a detector for receiving a predetermined frequency signal to produce a detection signal; a controller operative in response to the detection signal for producing a control signal performing a wake-up control; a switch circuit operative in response to said controller for using at least the predetermined frequency signal to power on or off a transmitter/receiver transmitting or receiving information; said controller sampling the detection signal to turn on or off said switch circuit based on a number of slots in a header field and a data field forming a frame of the predetermined frequency signal; a sampling circuit operative in response to the header field detected for producing a first count-up signal, and operative in response to a field detected other than the header field for producing a second count-up signal; a first detection counter for counting the first count-up signal; a second detection counter for counting the second count-up signal; and a decision circuit operative in response to a count in said first and second detection counters for determining whether said switch circuit is to be turned on or off; wherein said controller comprises a shift register for shifting the detection signal by one stage and two stages to produce a first and a second detection signal, and for producing a logical AND of the first and second detection signals, said sampling circuit using the logical AND to produce the first and second count-up signals.