Periodic electrical signal frequency monitoring systems and...

Details Periodic electrical signal frequency monitoring systems and... Periodic electrical signal frequency monitoring systems and...

2006-12-26

2006-12-26

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

C327S048000, C326S096000

Reexamination Certificate

active

07154305

ABSTRACT:
Systems and methods for monitoring frequencies of periodic electrical signals are disclosed. According to one technique, a first and second counters are respectively clocked by a first periodic electrical signal to be monitored and a second periodic electrical, and a threshold detector resets one of the counters when a count of the other counter crosses a reset threshold and determines whether a frequency error has occurred based on whether a count of the one of the counters crosses an alarm threshold. Another technique according to an embodiment of the invention also involves clocking counters with respective periodic electrical signals, although error detection is based on whether the counts of the counters cross respective associated thresholds in other than a particular sequence with respect to each other.

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IBM Technical Disclosure Bulletin, “Extendable Digital Frequency Comparator Using Standard Logic,” Bulletin, vol. 37, No. 6A, Jun. 1, 1994, pp. 347-348, XP000455800, ISSN: 0018-8689 *the whole document*.
European Patent Office, European Search Report, May 24, 2006.
European Patent Office, Foreign Application Search Report, Mar. 1, 2006.

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