Title:
ERROR PROPAGATION LIMITING METHOD OF VITERBI DECODER AND DEVICE THEREFOR
Document Type and Number:
Japanese Patent JP3304790
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To quickly obtain a correct decoded result after defect end by providing a defect detector and preliminarily checking the existence of a defect regarding a reproduction signal itself that is inputted to a Viterbi decoder.
SOLUTION: When a reproduction RF signal, that is a digital modulation signal is added to a signal input terminal IN from an optical disk, etc., a defect- detecting part A of a defect detector DRD performs a level decision of an RF signal and generates a signal, when the level of the RF signal is a prescribed value or less. A defect length deciding part B generates a defect detecting signal DD, when a low-level period when a signal of the part A continues for more than a deciding signal td that has been arbitrarily set is measured. The signal DD is added to a reset circuit D of a Viterbi decoder BTD, a reset signal is generated, these signals are added to a branch metric arithmetic unit E, and an addition and comparison arithmetic unit F and their states are reset.
More Like This:
Inventors:
Mariko Okumura
Tatsuya Narahara
Tatsuya Narahara
Application Number:
JP30261796A
Publication Date:
July 22, 2002
Filing Date:
November 14, 1996
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G11B20/18; H03M13/23; H03M13/41; (IPC1-7): H03M13/41; G11B20/18
Domestic Patent References:
| JP5206872A | ||||
| JP5225638A | ||||
| JP721615A |
Attorney, Agent or Firm:
Mitsuo Takahashi
Previous Patent: PART COLLECTION INSTRUCTION METHOD
Next Patent: STRUCTURE OF REAR BODY OF AUTOMOBILE
Next Patent: STRUCTURE OF REAR BODY OF AUTOMOBILE