Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1994-04-08
1995-10-31
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
455223, H04B 110
Patent
active
054636620
ABSTRACT:
An apparatus for snubbing or blanking digital signals representing a band of signals that includes an encoded carrier signal transmitted over a power line. An average signal level is compared with the instantaneous signal level to develop a blanking circuit control signal. Additionally, snubbing occurs in the circuit which determines the average signal level to prevent noise from building-up the average signal level. A hold-off signal is used in this circuit to prevent the average signal level from being latched permanently low. A unique infinite impulse filter subtracts out the D.C. offset thereby improving the dynamic range of the blanking. Additionally, the average signal level is used by AGC logic to control the gain at the front end of the apparatus. The state and switching of the AGC is controlled to minimize errors.
REFERENCES:
patent: 4070631 (1978-01-01), Nash et al.
patent: 4124819 (1978-11-01), Hansen
patent: 4236254 (1980-11-01), Augustin et al.
patent: 4755792 (1988-07-01), Pezzolo et al.
patent: 4918690 (1990-04-01), Markkula, Jr. et al.
patent: 5195098 (1993-03-01), Johnson et al.
patent: 5210518 (1993-05-01), Graham et al.
patent: 5260974 (1993-11-01), Johnson et al.
patent: 5271038 (1993-12-01), Cai
IEEE Transactions on Communications, Jan. 1976, pp. 106-112. "A Class of Soft Decision Error Detectors for the Gaussian Channel".
"Errors-and-Erasures Coding to Combat Impulse Noise on Digital Subscriber Loops", IEEE Transactions on Communication, vol. 38, No. 8, Aug. 1990.
Chui Benjamin W.
Downey Walter J.
Hurlbut Amy O.
Stewart J. Marcus
Sutterlin Philip H.
Chin Stephen
Echelon Corporation
Gluck Jeffrey W.
LandOfFree
Apparatus and method for reducing errors in data caused by noise does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for reducing errors in data caused by noise, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for reducing errors in data caused by noise will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1779658