Recording medium, signal recording apparatus thereof, and signal reproducing apparatus thereof

• US 5,587,991 A
• Filed: 01/18/1995
• Issued: 12/24/1996
• Est. Priority Date: 03/16/1994
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Ozaki, Naoki, Nabeshima, Daiki
• Primary Examiner(s): Nelms, David C.
• Assistant Examiner(s): LE, VU ANH
• Application Number:
  US08/375,428
• Time in Patent Office: 706 Days
• Field of Search: 369/275.3, 369/47, 369/48, 369/49, 369/54, 369/58, 369/275.4
• US Class Current: 369/59.25
• CPC Class Codes: G11B 20/1426 conversion to or from block codes or representations thereof
• CPC Class Codes: G11B 2220/20 Disc-shaped record carriers
• CPC Class Codes: G11B 27/3027 used signal is digitally coded
• CPC Class Codes: H03M 5/145 Conversion to or from block codes or representations thereof

Abstract

A recording medium having a SYNC (synchronous code) for synchronizing with data and a DCC (DC cancel code) for suppressing a DC component of a wave form of a signal recorded on the recording medium, the SYNC and the CDD being adjacently recorded on the recording medium. Both the SYNC and DCC are patterns that are not present in a data portion. A signal recording apparatus, comprising a DSV calculating means for calculating a DSV of a signal wave form recorded on the recording medium, a cancel code generating means for generating a cancel code for suppressing a DC component of the signal wave form corresponding to the DSV calculated by the DSV calculating means, and a recording means for connecting a synchronous code and record data to the cancel code generated by the cancel code generating means and recording the cancel code, the synchronous code, and the record data on the recording medium so that the cancel code and the synchronous code are adjacently disposed, the synchronous code being adapted for synchronizing with data. A signal reproducing apparatus, comprising a reading means for reading the signal from the recording medium, and a synchronous code detecting means for detecting a predetermined pattern contained in a continuous pattern of the synchronous code and the cancel code as a significant synchronous code for synchronizing with data from the signal read by the reading means.

Claims

1. A recording medium having a synchronous code and a cancel code, the synchronous code being adapted for synchronizing data, the cancel code being adapted for suppressing a DC component of a signal wave form recorded on said recording medium, the synchronous code and the cancel code being adjacently recorded on said recording medium.

3. The recording medium as set forth in claim 1 or 2,

wherein a code sequence composed of the synchronous code and the cancel code contains a signal pattern that is not present in record data.

2. A recording medium having a cancel code and a synchronous code, the cancel code being adapted for suppressing a DC component of a signal wave form recorded on said recording medium, the synchronous code being adapted for synchronizing data, the cancel code containing part of the synchronous code being recorded on said recording medium.

4. A signal recording apparatus of a recording medium, comprising:

DSV calculating means for calculating a DSV of a signal wave form recorded on the recording medium;

cancel code generating means for generating a cancel code for suppressing a DC component of the signal wave form corresponding to the DSV calculated by said DSV calculating means; and

recording means for connecting a synchronous code and record data to the cancel code generated by said cancel code generating means and recording the cancel code, the synchronous code, and the record data on the recording medium so that the cancel code and the synchronous code are adjacently disposed, the synchronous code being adapted for synchronizing with data.

5. A signal recording apparatus of a recording medium, comprising:

DSV calculating means for calculating a DSV of a signal wave form recorded on the recording medium;

cancel code generating means for generating a cancel code for suppressing a DC component of the signal wave form corresponding to the DSV calculated by said DSV calculating means; and

recording means for connecting a predetermined signal pattern and record data to the cancel code generated by said cancel code generating means and recording the cancel code, the predetermined signal pattern, and the record data on the recording medium so that the cancel code and the predetermined signal pattern are adjacently disposed, the predetermined signal pattern being part of a synchronous code, the synchronous code being adapted for synchronizing with data.

6. A signal reproducing apparatus for reproducing data from a recording medium on which a synchronous code for synchronizing with data and a cancel code for suppressing a DC component of a wave form of a signal are recorded, the synchronous code and the cancel code being adjacently recorded on the recording medium, comprising:

reading means for reading the signal from the recording medium; and

synchronous code detecting means for detecting a predetermined pattern contained in a continuous pattern of the synchronous code and the cancel code as a significant synchronous code for synchronizing with data from the signal read by said reading means.

7. A signal reproducing apparatus for reproducing data from a recording medium on which a cancel code for suppressing a DC component of a wave form of a signal is recorded, the cancel code containing part of a synchronous code for synchronizing with data, comprising:

reading means for reading the signal from the recording medium; and

synchronous code detecting means for detecting a predetermined pattern contained in a continuous pattern of the synchronous code and the cancel code as a significant synchronous code for synchronizing with data from the signal read by said reading means.