The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 2006
Filed:
Jul. 29, 2002
Hideki Sawaguchi, Kokubunji, JP;
Yasutaka Nishida, Kodaira, JP;
Masafumi Mochizuki, Kokubunji, JP;
Hiroyuki Tsuchinaga, Kodaira, JP;
Hideki Sawaguchi, Kokubunji, JP;
Yasutaka Nishida, Kodaira, JP;
Masafumi Mochizuki, Kokubunji, JP;
Hiroyuki Tsuchinaga, Kodaira, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a partial-response maximum-likelihood (PRML) signal detection and processing technique, reduction of data detection error events caused due to medium noise is achieved. For a PRML detection data result obtained after PRML data demodulation, a code error event that depends on a signal distance, and which has a high frequency of occurrences, is noticed and its occurrence probability is estimated. A locally-existing medium noise quantity is estimated from preceding and subsequent code patterns of the PRML detection data result. Based on this, the occurrence probability of the error event is compensated to improve the detection precision. As a result, data modulation with reliability higher than conventional maximum likelihood detection can be realized with a simple circuit structure.