Method and apparatus for modulating and demodulating data

Patent 6697311 Issued on February 24, 2004. Estimated Expiration Date:

November 18, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

PCM signal recording method and apparatus for recording four-channel data to be compatible with two-channel data
Patent #: 5247396
Issued on: 09/21/1993
Inventor: Nagai, et al.

Data decoder
Patent #: 6111833
Issued on: 08/29/2000
Inventor: Nakagawa, et al.

Data demodulating method and optical disk device using the method Patent #: 6215751
Issued on: 04/10/2001
Inventor: Tsuchinaga

Inventor

Kim, Dae Young

Assignee

LG Electronics Inc.

Application

No. 09/443209 filed on 11/18/1999

US Classes:

369/59.1, BINARY PULSE TRAIN INFORMATION SIGNAL369/47.19, For modulating or demodulating369/59.23Having specific code or form generation or regeneration processing

Examiners

Primary: Korzuch, William
Assistant: Chu, Kim-Kwok

Attorney, Agent or Firm

Birch, Stewart, Kolasch & Birch, LLP

International Classes

G11B 20/10 (20060101)
G11B 20/14 (20060101)

Foreign Application Priority Data

1998-11-20 KR

Abstract

A modulation/demodulation method of a run length limited method and a modulation/demodulation apparatus relate to converting a bit stream of a recording data into a bit stream proper to a recording phase when recording a data onto an optical recording medium. In the present data modulation and demodulation method, modulation data consist of partly consecutive 0s or 1s which are quantized in length, satisfying the given minimum and maximum run lengths of RLL at the same time. Therefore, a reproducing error is checked and corrected based on whether the quantizing condition is violated or not during the demodulation. This error recovery capability makes it possible to enhance a recording density of a recording medium and to reduce a judgement error possibility due to a jitter component of a reproducing signal, so that provides a high reliability for high density recording medium compared to a conventional modulation method.