The Basic Principles Of Anti-Tamper Digital Clocks
Hence, the present invention is just not intended to be limited to the embodiments proven herein but is to be accorded the widest scope according to the concepts and novel attributes disclosed herein.
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32. The apparatus for detecting voltage tampering as described in claim thirty, whereby the usually means for triggering the signifies for evaluating makes use of a clock edge at an conclude from the Appraise time frame to result in the implies for analyzing.
five. The method for detecting clock tampering as defined in claim 4, wherein the drinking water stage number is determined based on delayed monotone signals from a number of past clock Assess time.
In other more comprehensive aspects of the invention, Every single on the plurality of delayed monotone indicators 230 may possibly comprise either a a person or maybe a zero. The Examine circuit 240 may possibly figure out whether or not the number of types from the plurality of delayed monotone signals differs from the drinking water degree number by more than a predetermined threshold.
The actions of a method or algorithm explained in connection with the embodiments disclosed herein could be embodied right in components, or in a mix of components and a computer software module executed by a processor. A software package module might reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, challenging disk, a removable disk, a CD-ROM, or another sort of storage medium identified in the artwork.
With further reference to FIG. seven, A further element of the invention may perhaps reside within an apparatus for detecting clock tampering, comprising: a first circuit 750A, a primary plurality of resettable delay line segments 710, a next circuit 750B, a 2nd plurality of resettable delay line segments 720, and an Consider circuit 240. The main circuit presents a primary monotone sign for the duration of a primary clock Examine time period linked to a clock. The 1st plurality of resettable hold off line segments Each individual delay the very first monotone signal to crank out a respective to start with plurality of delayed monotone indicators. Resettable delay line segments involving a resettable delay line phase affiliated with a minimum amount delay time along with a resettable delay line segment linked to a maximum hold off time are Just about every connected to discretely rising hold off periods. The second circuit gives a next monotone signal for the duration of a 2nd clock evaluate period of time associated with the clock.
The sloped major clock enclosure is utilized Typically use inside of a Health treatment or correction atmosphere that the shoppers tend to be not sizeable menace, However maximum stability in your components is vital
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11. The equipment for detecting clock tampering as described in declare 8, wherein-the means for assessing determines regardless of whether the amount of kinds inside the plurality of delayed monotone indicators differs from the drinking water degree number by greater than a predetermined threshold.
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This certain circuit acts being a water stage: circuits related to shorter delay strains will evaluate a ‘0’ though circuits associated with lengthier hold off lines will measure a ‘one’. A substantial water PROENC amount mark and also a lower level mark may possibly function a induce.