Noise cancellation circuits and methods

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C327S552000

Reexamination Certificate

active

07075362

ABSTRACT:
Circuits and methods for coherent noise cancellation are provided. More specifically, circuits and methods are provided for coherent cancellation of noise that is present in a data signal due to noise being present in the source signal (e.g., an optical signal) that is used to produce the data signal. The circuits, which use a subtraction process rather than division, are easy to implement in a chip, and provide for wide bandwidth performance.

REFERENCES:
patent: 4291343 (1981-09-01), Riddle, Jr.
patent: 4344150 (1982-08-01), McLaughlin
patent: 4536089 (1985-08-01), Siebert
patent: 4843488 (1989-06-01), Watatani et al.
patent: 4964110 (1990-10-01), Horimai et al.
patent: 5498993 (1996-03-01), Ohtsuka et al.
patent: 6026071 (2000-02-01), Kimura
patent: 6795386 (2004-09-01), Kobayashi
patent: 6891875 (2005-05-01), Nagara et al.
patent: 2005/0135222 (2005-06-01), Fukutomi et al.
Chiang, C., “Adaptive Noise Cancellation Using a Hybrid Algorithm,” School of Information and Electrical Engineering, The University of Queensland (May 2003).
Haller, K. and Hobbs, P, “Double Beam Laser Absorption Spectroscopy: Shot Noise-Limited Performance at Baseband with a Novel Electronic Noise Canceller,” in Optical Methods for Ultrasensitive Detection and Analysis: Technique and Application, B.L. Feurey, ed., Proc. SPIE 1435, 298-309 (1991).
Hobbs, P., “Reaching the Shot Noise Limit for $10”, Apr. 1991, Optics & Photonics News, pp. 17-23.
Milster, T., et al., “Optical Data Storage Readout with Quadrant Pupil Detection,” Applied Optics vol. 35, No. 14, pp. 2471-2476 (May 10, 1996).
Wenger, M., “Noise Rejection—The Essence of Good Speech Recognition,” Emkay Innovative Products, www.emkayproducts.com/images/pdf/white/NoiseRejection.pdf, pp. 1-13 (believed to be at least as early as 2003).
“A Survey of Methods Using Balanced Photodetection,” New Focus, Application Note 14, pp. 1-8.

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 cancellation circuits and methods 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 cancellation circuits and methods, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise cancellation circuits and methods will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3588014

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