Information recording disc with composite index codes and its playback method

• US 4,843,484 A
• Filed: 06/18/1987
• Issued: 06/27/1989
• Est. Priority Date: 09/12/1986
• Status: Expired due to Term

• Current Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Original Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Inventors: Watanabe, Tsuyoshi, Katagiri, Shoichi, Kanamaru, Hitoshi, Shiba, Takahumi
• Primary Examiner(s): Hix, L. T.
• Assistant Examiner(s): Rutledge, D.
• Application Number:
  US07/063,439
• Time in Patent Office: 740 Days
• Field of Search: 358/342, 358/343, 360/72.1, 360/72.2, 369/54, 369/57
• US Class Current: 386/241
• CPC Class Codes: G11B 2220/2545 CDs
• CPC Class Codes: G11B 27/105 of operating discs
• CPC Class Codes: G11B 27/329 on a disc [VTOC]
• CPC Class Codes: G11B 7/005 Reproducing G11B7/0065 takes precedence
• CPC Class Codes: G11B 7/00745 Sectoring or header formats within a track formats in general G11B20/12
• CPC Class Codes: G11B 7/013 for discrete information, i.e. where each information unit is stored in a distinct discrete location , e.g. digital information formats within a data block or sector
• CPC Class Codes: G11B 7/08505 Methods for track change, selection or preliminary positioning by moving the head
• CPC Class Codes: H04N 5/7605 on discs or drums H04N5/781, H04N5/805, H04N5/83, H04N5/85 take precedence

Abstract

An information recording disc having a first recording area carrying a digital signal, a second recording area carrying a frequency modulated video signal and a superimposed digital signal, the first and second recording areas respectively having a lead-in area in which index codes relating to the contents of each recording area and including identification information indicating the recording area to which each index code belongs are recorded mixedly. In playing such a recording disc, index codes read from the lead-in area are classified according to the recording area to which each index code belongs, and stored in corresponding memory areas of a memory device, so that the index codes stored in the memory area corresponding to a designated recording area can be retreived in a short time for playing information, and the playing operation is controlled by using the retrieved index codes.

Claims

1. An information recording disc, comprising first and second recording areas in one surface thereof, only a digital signal being recorded in said first recording area and a frequency modulated video signal and a digital signal superimposed on said frequency modulated video signal being recorded in said second recording area, said first and second recording areas respectively having a lead-in area in which first and second index code groups respectively made up of index codes relating to information recorded in corresponding one of said first and second recording areas are recorded, wherein each of said index codes of said first and second index code groups includes identification information indicating the recording area to which the index code itself belongs, and wherein said index codes of said first and second index code groups are mixed with each other in each lead-in area of said first and second recording areas.

2. An information recording disc as set forth in claim 1, wherein said index codes of said first index code group and said index codes of said second index code group are arranged in alternate way in each of said lead-in areas.

3. A method for playing an information recording disc which includes first and second recording areas in one surface thereof, only a digital signal being recorded in said first recording area and a frequency modulated video signal and a digital signal superimposed on said frequency modulated video signal being recorded in said second recording area, said first and second recording areas respectively having a lead-in area in which first and second index code groups respectively made up of index codes relating to information recorded in corresponding one of said first and second recording areas, wherein each of said index codes of said first and second index code groups includes identification information indicating the recording area to which the index code itself belongs, and wherein said index codes of said first and second index code groups are mixed with each other in each lead-in area of said first and second recording areas, said playing method comprising:

a step for reading from said lead-in area said index codes of said first and second index code groups;

a step for storing said index codes of said first index code group in a first memory area of a memory device;

a step for storing said index codes of said second index code group in a second memory area of said memory device;

a step for selecting one of said first and second memory areas and retrieving said index codes stored in the selected memory area, for playing back information recorded on said recording disc, in accordance with a designation of the recording area to be played; and

a step for controlling a playback operation for playing back information recorded in said designated recorded area by using index codes retrieved from said selected memory areas.

4. An information recording disc, comprising first and second recording areas in one surface thereof for recording a plurality of selections of information, only a digital signal being recorded in said first recording area and a frequency modulated video signal and digital signal superimposed on said frequency modulated video signal being recorded in said second recording area, said first and second recording areas respectively having a lead-in area in which first and second index code groups respectively made up of index codes relating to information recorded in corresponding one of said first and second recording areas are recorded, wherein each of said index codes of said first and second index code groups includes identification information indicating the recording area to which the index code itself belongs, and wherein said index codes of said first and second index code groups are mixed with each other in each lead-in area of said first and second recording areas, and wherein said first and second index code groups contain information related to length of time parameters of said plurality of selection of information recorded in said recording areas.