Not known Details About Anti-Tamper Digital Clocks
Not known Details About Anti-Tamper Digital Clocks
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A modern digital clock, which happens to be fixed into our British isles registered design 6081840 anti-ligature clock housing
A small distinction as a consequence of ordinary environmental adjustments like temperature are going to be within a predetermined detection threshold. A substantial variance in violations on account of tampering (frequency and/or voltage) will probably be outside of the predetermined detection threshold.
five. The strategy for detecting clock tampering as described in claim 4, wherein the drinking water stage quantity is decided based upon delayed monotone indicators from a number of previous clock evaluate time.
an Consider circuit, triggered from the clock, that utilizes the primary plurality of delayed monotone alerts or the next plurality of delayed monotone indicators to detect a clock fault.
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What on earth is claimed is: 1. A method for detecting clock tampering, comprising: supplying a plurality of resettable hold off line segments, whereby resettable hold off line segments among a resettable hold off line segment associated with a least hold off time as well as a resettable hold off line section connected to a optimum delay time are Every single linked to discretely increasing hold off occasions;
The h2o amount quantity may very well be identified determined by delayed monotone signals from a number of prior Appraise time 310. The plurality of resettable delay line segments could comprise taps together a hold off line. Alternatively, the plurality of resettable delay line segments comprises parallel hold off strains.
The next clock Assess time frame handles a unique time than the very first clock Examine time frame, as might be enforced by an inverter 730. The 2nd plurality of resettable hold off line segments Every delay the 2nd monotone signal to generate a respective 2nd plurality of delayed monotone indicators. Resettable delay line segments concerning a resettable hold off line phase connected to a bare minimum hold off time along with a resettable delay line phase affiliated with a optimum hold off time are Every single related to discretely growing delay periods. The Examine circuit is induced by the clock (e.g., EVAL) and employs the very first plurality of delayed monotone alerts or the second plurality of delayed monotone indicators to detect a clock fault. A multiplexer 760 may possibly find which of the initial or second plurality of delayed monotone signals are active being provided towards the Assess circuit.
Narrow, black rectangular Liquid crystal display alarm clock that has a multi-perform monitor in a stylish colourway on a contemporary, futuristic stand. The bizarre alarm clock layout incorporates a twelve or 24 hour time display, a digital alarm, snooze functionality and temperature display.
24. The tactic for detecting voltage tampering as described in assert 23, further more comprising: resetting the resettable hold off line segments during a reset period of time, wherein the reset period of time is prior to the Examine time frame.
11. The apparatus for detecting clock tampering as defined in claim eight, whereby-the usually means for analyzing determines whether the quantity of ones in the plurality of delayed monotone indicators differs from the drinking water degree selection by in excess of a predetermined threshold.
A monotone sign is provided in the course of an Assess time frame. The monotone signal is delayed working with Just about every of your plurality of resettable delay line segments to create a respective plurality of delayed monotone alerts. A clock is accustomed to result in an Assess circuit that employs the plurality of delayed monotone alerts to detect a voltage fault.
In other additional thorough facets of the invention, Anti-Tamper Digital Clocks Each and every with the plurality of delayed monotone indicators may be both a a person or simply a zero. The Appraise circuit could ascertain irrespective of whether the amount of types during the plurality of delayed monotone signals differs from the water degree quantity by greater than a predetermined threshold.