Communications: electrical – Tactual indication
Patent
1993-11-29
1995-11-21
Swarthout, Brent
Communications: electrical
Tactual indication
3403111, 34082144, 34082546, 455 382, G08B 522, H04B 336
Patent
active
054691338
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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Bergman Scott I.
Costello Mike P.
Hensler Scott E.
Moy Jeffery D.
Swarthout Brent
Tong Hina
Weiss Harry M.
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