Anti-Tamper Digital Clocks No Further a Mystery
Anti-Tamper Digital Clocks No Further a Mystery
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Therefore, the current invention will not be meant to be limited to the embodiments shown herein but should be to be accorded the widest scope in step with the ideas and novel options disclosed herein.
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A different delay line section could have N hold off features that create the maximum delayed monotone sign 230-N. AND gates in the delay traces may well Each individual Have got a reset enter RST to reset the line in between the delay factors to set the delay line to an First known point out.
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The rear All round human body of your clock enclosure has 4 mounting holes to drill in to the wall for mounting the rear get additional details for your wall, the digital clock is then mounted to the rear human system as well as the entrance portion is then put into your rear area and secured in placement with anti-tamper fasteners.
Exactly what is claimed is: one. A method for detecting clock tampering, comprising: providing a plurality of resettable delay line segments, wherein resettable delay line segments among a resettable delay line phase linked to a minimum amount delay time plus a resettable hold off line section associated with a greatest delay time are Each and every connected to discretely escalating delay times;
A monotone sign is delivered throughout a clock Examine period of time linked to a clock. The monotone sign is delayed utilizing Every single from the plurality of resettable hold off line segments to create a respective plurality of delayed monotone indicators. The clock is accustomed to set off an evaluate circuit that makes use of the plurality of delayed monotone indicators to detect a clock fault.
With the twin circuit strategy, just one circuit will probably be sure to be in the Consider stage all through this while interval.
In additional in-depth facets of the invention, the tactic may additional contain resetting the resettable hold off line segments through a reset time period.
a first plurality get more info of resettable delay line segments that every delay the very first monotone sign to deliver a respective 1st plurality of delayed monotone signals, wherein resettable delay line segments in between a resettable hold off line section connected with a minimum delay time plus a resettable delay line segment linked to a utmost delay time are each connected to discretely expanding delay periods;
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Modern anti-ligature structure concluded in white powder coat other colours out there upon ask for