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Receiver with constant battery saving duty cycle

  • US 5,355,518 A
  • Filed: 05/26/1992
  • Issued: 10/11/1994
  • Est. Priority Date: 05/26/1992
  • Status: Expired due to Fees
First Claim
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1. A method for saving battery energy in a radio, having a receiver for receiving a carrier signal to produce a recovered signal, the method comprising the steps offplacing said radio in a first battery saver mode having a duty cycle determined by a first ON time period and a first OFF time period;

  • detecting the absence of the carrier signal during said first ON time period;

    maintaining said radio in said first battery saver mode in response to the detecting of the absence of the carrier signal, said first battery saver mode having said first OFF time period for allowing said radio to sleep;

    detecting the presence of the carrier signal during said first ON time period;

    placing said radio, in a second battery saver mode, in response to the detected presence of the carrier signal, the second battery saver mode having the same duty cycle as the first battery saver mode, but the second battery saver mode having a second ON time period and a second OFF time period, both second periods being longer than said first time periods;

    detecting the presence of a non-valid coded squelch signal in said recovered signal during said second ON time period; and

    maintaining said radio, in said second battery saver mode, in response to the detected presence of the carrier signal and the detected presence of the non-valid coded squelch signal, the second battery saver mode having said second OFF time period, said second OFF time period extended longer from said first OFF time period for allowing said radio to sleep longer to maintain the same battery savings from said first battery saver mode, even with said longer second ON time period.

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