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:
Mar. 27, 2001
Filed:
Jan. 08, 1999
Michiru Hori, Tokyo, JP;
Masayuki Koyama, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A code synchronization decision circuit of Viterbi decoder including a trigger signal generator that produces a trigger signal every time a symbol counter counts a predetermined number of symbols defined externally. A second comparator compares, in response to the trigger signal, the number of errors of symbols counted by an error counter with a threshold value that is externally set, and supplies a masking signal generator with a synchronization signal or a slip signal in response of the compared result. The masking signal generator, in response to the signals, generates a masking signal for suspending the operation of the error counter and symbol counter for a time period, during which unsuitable codes will be supplied to the code synchronization decision circuit from a re-encoder of the Viterbi decoder as one of compared values for detecting symbol errors. This makes it possible for a user to set the threshold value and the number of symbols to be counted with ease, and to implement a code synchronization decision circuit of a Viterbi decoder capable of saving power.