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US 4,755,816 AGranted
Battery saving method for a selective call radio paging receiver
AssigneeMotorola, Inc.
InventorMichael J. DeLuca
Life of this patent
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AssigneeMotorola, Inc.
InventorMichael J. DeLuca
Estimating the term…
In a battery powered radio paging receiver, a battery saving method extends battery life and prevents the loss of messages stored in volatile random access memory. Upon receipt of a message, a plurality of alerting devices (vibrators, LCD back-lights, LED's and audio alert tone generators) are sequentially activated. Before each device is activated, however, the battery voltage is checked to determine if sufficient charge remains to power the alerting device without dropping the battery voltage below the minimum requirement for retaining information in the memory. If an alerting device is activated, the battery voltage is repeatedly checked and if it drops below a threshold level, the device is deactivated. If the alerting device is an escalating volume audio alert tone generator and the battery voltage is below a threshold voltage, the volume of the generator is restricted to its lower volume range. The received message is also checked to determine if it has a priority status. If the message is a priority message, all alerting devices are activated, regardless of the battery voltage.
A battery saving method, for use in a battery powered selective call radio receiver including an escalating alert device having low and high volume modes, comprising the steps of:
A battery saving method, for use in a battery powered selective call radio receiver having an alerting device, comprising the steps of:
A battery saving method, for use in a battery powered selective call radio receiver including a single power alert device and an escalating alert device having low and high volume modes, comprising the steps of:
Dependencies are inferred from the claim text.