US 2004/0205443 A1Published application

Data reproducing method and data reproducing apparatus

AssigneeHitachi, Ltd.

InventorsTaku Hoshizawa, Yukari Katayama

Life of this patent

Estimating the term…

Loading patent…

Abstract

In encoding digital data, scrambling is executed after error correction encoding is completed. In decoding digital data, error correction processing is executed after descrambling is completed. In the error correction processing, after syndrome calculation is performed, syndrome s0 is used to determine the location and value of an error; the error value is subtracted from each syndrome value; and the result is divided by a fixed value. This process realizes a digital data encoding and decoding system providing substantially the same correcting ability as a conventional process except that error propagation occurs through descrambling.

Claims10

Dependent claims

A data reproducing method for reproducing recorded data from a recording medium wherein said recorded data is generated by generating an error correction block by adding error correcting parity to data comprising main data, identification data and error correcting parity for the main data and the identification data;

and converting the data in the error correction block by superimposing data, generated from data conversion information, on the data in the error correction block, said data reproducing method comprising the steps of:
reading out the data conversion information from the recording medium;
generating the superimposed data from the data conversion information;
de-converting the converted data by using the data conversion information read out and the superimposed data generated;
calculating syndromes of the de-converted data and, if one of the plural calculated syndromes, Sn (n is an integer), is not zero, making a judgment that the last data of the de-converted data includes an error, correcting the last data and returning the corrected last data into the error correction block;
and
reproducing the data in the error correction block by removing the error correcting parity from the error correction block.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/746,007Filed 26 Dec 2003
Priority: JP 2002-37584726 Dec 2002
Published: 14 Oct 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G11B 20/18
Digital recording or reproducing: error detection or correction; Testing , e.g. of drop-outs
G11B 2020/1836
By adding special lists or symbols to the coded information: using a Reed Solomon [RS] code
G11B
Information storage based on relative movement between record carrier and transducer

Family

US 7,216,286 B2Related patent
US 2004/0205443 A1This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

Building an agent or pulling many patents? Use the API or MCP server instead of scraping pages. Get an API key