Signal search method for selective call receiver
AssigneeMotorola, Inc.
InventorsCourtney S. Henry, Gregory O. Snowden, Thomas E. Holmes
Life of this patent
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Abstract
A method of rejecting undesired signals in a selective call receiver operating in a POCSAG system comprises normalizing and counting data transitions that occur at a baud rate less than a predetermined baud rate, comparing the counted number to the total number of transitions, and using this information as criteria for extending the selective call receiver "on" time in a signal search mode.
Claims18
A method in an electronic device capable of receiving signals having transitions between first and second states and including data as determined by said first and second states, said method comprising the steps of:
- measuring the time between adjacent ones of each of said transitions for a predetermined number of transitions;
- counting the number of measured times having a magnitude greater than a predetermined time;
- and
- making a decision based on the number of counted measured times.
An apparatus capable of receiving signals having transitions between first and second states and including data as determined by said first and second states, comprising:
- first means for receiving said data;
- second means for measuring the time between adjacent ones of each of said transitions for a predetermined number of transitions;
- third means for counting the number of measured times having a magnitude greater than a predetermined time;
- and
- fourth means for making a decision based on the number of counted measured times.
A method for reducing power consumption in a selective call receiver capable of receiving signals having transitions between first and second states and including data as determined by said first and second states, wherein only a first portion of said selective call receiver is initially powered, said method comprising the steps of:
- measuring the time between adjacent ones of each of said transitions for a predetermined number of transitions;
- normalizing the measured times having a predetermined relationship with a predetermined time;
- counting the number of normalizations;
- and
- determining whether to extend power to additional portions of said selective call receiver based on the number of counted normalizations.
A selective call receiver having reduced power consumption, capable of receiving signals having transitions between first and second states and including data as determined by said first and second states, comprising:
- first means for receiving said data;
- second means for measuring the time between adjacent ones of each of said transitions for a predetermined number of transitions;
- third means for normalizing the measured times having a predetermined relationship with a predetermined time;
- fourth means for counting the number of normalizations;
- and
- fifth means for determining whether to decode the received signal based on the number of counted normalizations.
Dependencies are inferred from the claim text.