H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/27, 325/28
H04N 7/16 (2006.01) H03M 13/45 (2006.01) H04L 1/24 (2006.01) H04L 25/06 (2006.01) H04L 25/497 (2006.01)
Patent
CA 1233233
ERROR CORRECTION SCHEME ABSTRACT OF THE DISCLOSURE An error correcting scheme for processing data which is transmitted on a broadcast and/or CATV network and utilizes the IEEE 802.4 three-level duobinary AM/PSK (phase shift keying) coding format. The error correcting scheme utilizes two thresholders. One of the thresholders makes data (1 or 0) decisions while the other thresholder makes non-data or no non-data (non-data) decisions. Pattern matching and windowing are used to detect non-data symbols which are corrected if the non-data symbols deviate from a predeter- mined pattern. The template used in the pattern matching is determined from the state of a demodulator. Background of the Invention (1) Field of the Invention The invention relates to the detection and correction of errors in information processing and, more particularly, to detection and correction of errors in signals transmitted on a broadband network utilizing a three-level duobinary AM/PSK coding format. (2) Prior Art Error detecting and correcting techniques for process- ing information are well known in the prior art. Most error detecting and correcting techniques are directly related to the type of coding technique used to handle the data. U.S. Patent 4,118,686 describes an isolated (single) error
510245
Barrett B.p.
International Business Machines Corporation
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