Telephone pager alarm enhancement and method therefor
First Claim
1. An enhanced alarm circuit for signaling an individual when said individual is being paged, comprising, in combination:
- a telephone,pager of the type that vibrates in response to receiving a signal representing said individual'"'"'s telephone pager number;
means for sensing the vibration of the telephone pager and for providing a plurality of trigger signals in response thereto;
means for providing a recognition pulse of a desired duration in response to at least two successive said trigger signals having a time interval therebetween less than a known time; and
means for issuing an alarm in response to said recognition pulse.
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Accused Products
Abstract
Vibration of a pager is sensed by a piezoelectric crystal. A buffered output of the crystal is connected through a low pass filter to an input of a retriggerable monostable multivibrator having a period of approximately twenty milliseconds. In response to the twenty millisecond multivibrator being retriggered to provide a recognition pulse having a duration of approximately three seconds, a latch is set. An output of the latch drives an LED circuit that provides a visual indication of a page. In response to the latch being set, an astable multivibrator provides alarm pulses having a duration of approximately eight seconds with a thirty second interval therebetween. The output of the latch and the output of the astable multivibrator drive an audio alarm circuit through a selector switch. When the switch is thrown in one direction, the setting of the latch causes the alarm circuit to provide a continuous audible sound. When the switch is thrown in the other direction, the setting of the latch causes the alarm circuit to provide eight second bursts of sound at thirty second intervals.
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Citations
13 Claims
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1. An enhanced alarm circuit for signaling an individual when said individual is being paged, comprising, in combination:
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a telephone,pager of the type that vibrates in response to receiving a signal representing said individual'"'"'s telephone pager number; means for sensing the vibration of the telephone pager and for providing a plurality of trigger signals in response thereto; means for providing a recognition pulse of a desired duration in response to at least two successive said trigger signals having a time interval therebetween less than a known time; and means for issuing an alarm in response to said recognition pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In the method of issuing an alarm signaling an individual when said individual is being paged, the steps of:
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providing a telephone pager of the type that vibrates in response to receiving a signal representation of said individual'"'"'s telephone pager number; sensing the vibration of the telephone pager and providing a plurality of trigger signals in response thereto; providing a recognition pulse in response to at least two successive trigger signals having a time interval therebetween less than a known time; and issuing an alarm in response to said recognition pulse. - View Dependent Claims (11, 12, 13)
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Specification