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Battery saver for a paging receiver or the like _

  • US 4,506,386 A
  • Filed: 05/24/1983
  • Issued: 03/19/1985
  • Est. Priority Date: 05/28/1982
  • Status: Expired due to Term
First Claim
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1. In a portable radio communication apparatus responsive to a digital preamble code and a digital identification code and having at least a receiving section, a power source and a battery saving circuit which produces a control signal to control the supply of power from the power source to the receiving section, said battery saving circuit including a decoder means comprising a digital data processor for detecting a first coincidence between the digital preamble code and a first predetermined digital code, and a second coincidence between the digital identification code and a second predetermined digital code, and for selectively providing said first control signal, a method for detecting said first coincidence between said digital preamble code and said first predetermined digital code and selectively providing said control signal comprising the steps of:

  • comparing said digital preamble code on a bit-by-bit basis with said first predetermined digital code;

    producing an error signal each time corresponding bits of said digital preamble code and said first predetermined digital code do not coincide;

    adding a produced error signal to previously produced error signals as soon as the error signal is produced to provide a continuously updated count of the error signals produced during the bit-by-bit comparison between digital preamble code and the first predetermined digital code; and

    suspending provision of said control signal as soon as counted error signals reach a preset number;

    maintaining said control signal for predetermined time when each bit of said digital preamble code coincides with each bit of said first predetermined digital code; and

    comparing said digital identification code with said second predetermined digital code, after coincidence between said digital preamble code and said first predetermined digital code has been determined.

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