Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-07-18
2006-07-18
Trieu, Van T. (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S573700, C340S517000, C340S392300, C600S484000, C600S485000, C600S514000
Reexamination Certificate
active
07079036
ABSTRACT:
There is provided herein a first preferred arrangement of the instant invention, wherein an electronic patient monitor utilizes a computer CPU as an alarm signal generator, which CPU is preferably directly connected to a power amplifier and/or a speaker without an intervening (or subsequent) conventional volume control. The alarm signal is preferably expressed as a series of square waves. The volume of the alarm signal as heard through the speaker is controlled by varying the width of the square waves that represent the alarm signal with the duty cycle of the square waves being shortened to reduce the output alarm volume and lengthened to increase it.
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Joshua Israelsohn, “Class D Gen E,”,EDN, Apr. 15, 2004, pp. 49-58.
Cooper Craig L.
Smith Toby E.
Bed-Check Corporation
Fellers Snider Blankenship Bailey & Tippens, P.C.
Trieu Van T.
Watt Terry L.
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