Switch noise reduction device and method using counter

Details Switch noise reduction device and method using counter Switch noise reduction device and method using counter

2007-05-30

2010-12-07

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Signal transmission integrity or spurious noise override

C327S385000, C327S386000, C341S024000

Reexamination Certificate

active

07847614

ABSTRACT:
A switch de-bouncing device includes a majority counter that counts samples generated by a sampler sampling a switch output where a counter value is incremented for each sample indicating a first switch state and decremented for each sample indicating a second switch state of the switch. A controller determines that the switch is in the first switch state when the counter value is above a first state threshold and is in the second switch state when the counter value is below a second state threshold.

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Internet Document: Ganssle, Jack, “A Guide to Debouncing”, The Ganssle Group (Aug. 2004) available at: http://www.ganssle.com/debouncing.pdf (accessed Nov. 7, 2006) Note the “counting algorithm” proposed in this document (starting on p. 18).

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