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Receiving control apparatus and method thereof

  • US 6,542,727 B1
  • Filed: 08/25/1999
  • Issued: 04/01/2003
  • Est. Priority Date: 02/19/1999
  • Status: Expired due to Fees
First Claim
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1. A receiving control apparatus comprising:

  • reference frequency oscillator generating a high-accuracy first clock signal;

    time clock oscillator generating a second clock signal which has a lower accuracy than the clock signal generated by the reference frequency oscillator, with smaller power consumption than the reference frequency oscillator;

    receiver receiving transmitted signals;

    controller controlling the apparatus, during normal communications so as to drive the receiver and to receive signals based on the first clock signal generated by the reference frequency oscillator, during receiving standby so as to stop the reference frequency oscillator and to manage/control intermittent receiving timing based on the second clock signal generated by the time clock oscillator, when the apparatus shifts from a receiving standby state to a communications state, so as to start the reference frequency oscillator based on the second clock signal generated by the time clock oscillator and after an operation of the reference frequency oscillator is stabilized so as to start reception of signals using the receiver;

    frequency deviation detector, after the operation of said reference frequency oscillator is stabilized, detecting frequency deviation against the first clock signal of the second clock signal generated by the time clock oscillator by counting a number of pulses of the first clock signal generated by said reference frequency oscillator in one cycle of a divided clock signal of the second clock signal generated by said time clock oscillator; and

    storage storing a frequency deviation value detected by the frequency deviation detector as data, wherein said controller corrects timing for starting said reference frequency oscillator based on the data stored in the storage.

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