Noise reduction filter for trigger circuit

Data processing: measuring – calibrating – or testing – Measurement system – Measured signal processing

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C324S076110

Reexamination Certificate

active

07610178

ABSTRACT:
A noise rejection filter for a trigger circuit uses an algorithm that updates the filter output monotonically so long as the signal slope remains unchanged, maintains the filter output at a constant level when the signal slope changes but the difference between the sample value and the filter output is less than or equal to a hysteresis value, and changes the signal slope while updating the filter output when the difference is greater than the hysteresis value. This maintains the peaks of the input signal at the filter output. The noise rejection filter may be used in a trigger circuit prior to a comparator so that the trigger signal from the comparator accurately reflects the signal pulse width at a desired trigger level and trigger events are detected when the desired trigger level is near the peaks of the input signal.

REFERENCES:
patent: 4823076 (1989-04-01), Haines et al.
patent: 4888588 (1989-12-01), Castagnozzi
patent: 5184062 (1993-02-01), Ladwig
patent: 5375067 (1994-12-01), Berchin
patent: 5414635 (1995-05-01), Ohta
patent: 5438531 (1995-08-01), Shank
patent: 5930745 (1999-07-01), Swift
patent: 5978742 (1999-11-01), Pickerd
patent: 6279130 (2001-08-01), Moser
patent: 6615148 (2003-09-01), Pickerd
patent: 6621913 (2003-09-01), de Vries
patent: 6753677 (2004-06-01), Weller et al.
patent: 6760673 (2004-07-01), Genther et al.
patent: 6892150 (2005-05-01), Pickerd
patent: 6915218 (2005-07-01), Pickerd
patent: 6970118 (2005-11-01), Regier
patent: 7034517 (2006-04-01), Newcombe
patent: 7072785 (2006-07-01), De Lacy et al.
patent: 7072804 (2006-07-01), Weller
patent: 7110898 (2006-09-01), Montijo et al.
patent: 7191079 (2007-03-01), Smith et al.
patent: 7219037 (2007-05-01), Pupalaikis et al.
patent: 2002/0171408 (2002-11-01), Hansen
patent: 2004/0119620 (2004-06-01), Tran et al.
patent: 2004/0236527 (2004-11-01), Felps
patent: 2005/0246113 (2005-11-01), Montijo
patent: 2006/0015862 (2006-01-01), Odom et al.
patent: 2224869 (1990-05-01), None
“Digital Trigger Ciruit with Excellent Noise Suppression”, by W. Van Driessche and Gullentops, Rev. Sci. Instrum., vol. 46, No. 12, Dec. 1975, Copyright 1975, by the American Institute of Physics; pp. 1659-1662.
Precision Digital Oscilloscopes and Waveform Recorders, by James L. Sorden, Hewlett-Packard Journal, Feb. 1988, pp. 6-11, and 14.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Noise reduction filter for trigger circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Noise reduction filter for trigger circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise reduction filter for trigger circuit will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-4117464

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.