Method and apparatus for recording and reproducing digital data
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTetsuya Mizushima, Akira Iketani, Tatsuro Juri
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Abstract
A digital data recording apparatus records digital data in tracks on a tape. Each track has a first signal area for storing track format information and a second signal area for storing a plurality of sync blocks. The apparatus includes a circuit for inserting, in the first signal area, regular TDS information indicating the track data structure of digital data, and a circuit for inserting, in the final sync block, backup TDS information having the same structure as the regular TDS information.
Claims27
A method for recording digital data on a recording medium in a form of tracks aligned parallelly on said recording medium, each of said tracks having a track data format selected from at least a first and second track data formats, and each track having a first signal area for storing track format information and a second signal area for storing a plurality of sync blocks, each of said plurality of sync blocks including a sync pattern, an ID code and information data, said method comprising:
- inserting, in said first signal area, regular TDS information indicating a track data format of a track in which said first signal area is positioned;
- and
- inserting, into said ID code of a predetermined one of said plurality of sync blocks, backup TDS information, wherein said regular TDS information and said backup TDS information are the same information, wherein said ID code of said first track data format and said ID code of said second track data format have the same data structure, and wherein said first track data format includes a first predetermined number of sync blocks when said first track data format is recorded, and said second track data format includes a second predetermined number of sync blocks when said second track data format is recorded.
A reproducing method for reproducing digital data from a recording medium by reading tracks from said recording medium, each of said tracks having a track data format selected from at least a first and second track data formats, each track having a first signal area containing regular TDS information indicating a track data format of the track in which said first signal area is positioned, and a second signal area containing a plurality of sync blocks, wherein each of said plurality of sync blocks includes a sync pattern, an ID code and information data, and wherein a predetermined one of said plurality of sync blocks includes backup TDS information having the same information as said regular TDS information, and wherein said ID code of said first track data format and said ID code of said second track data format have the same data structure, and wherein said first track data format includes a first predetermined number of sync blocks when said first track data is reproduced, and said second track data format includes a second predetermined number of sync blocks when said second track data is reproduced, said method comprising:
- detecting said regular TDS information from said first signal area;
- detecting said backup TDS information from said ID code in said predetermined sync block of said second signal area;
- and
- selecting one of said regular TDS information and said backup TDS information.
An apparatus for recording digital data on a recording medium in a form of tracks aligned parallelly on said recording medium, each of said tracks having a track data format selected from at least a first and second track data formats, and each track having a first signal area for storing track format information and a second signal area for storing a plurality of sync blocks, each of said plurality of sync blocks comprising a sync pattern, an ID code and information data, said apparatus comprising:
- first inserting means for inserting, in said first signal area, regular TDS information indicating a track data format of a track in which said first signal area is positioned;
- and
- second inserting means for inserting, into said ID code of a predetermined one of said plurality of sync blocks, backup TDS information, wherein said regular TDS information and said backup TDS information are identical, and wherein said ID code of said first track data format and that of said second track data format have the same data structure, and wherein said first track data format includes of a first predetermined number of sync blocks when said first track data format is recorded, and said second track data format includes a second predetermined number of sync blocks when said second track data format is recorded.
An apparatus for reproducing digital data from a recording medium by reading tracks from said recording medium, each of said tracks having a track data format selected from at least a first and second track data formats, and each track having a first signal area comprising regular TDS information indicating a track data format of a track in which said first signal area is positioned, and a second signal area comprising a plurality of sync blocks, wherein each of said plurality of sync blocks includes a sync pattern, an ID code and information data, and wherein a predetermined one of said plurality of sync blocks includes backup TDS information having the same information as said regular TDS information, and wherein said ID code of said first track data format and said ID code of said second track data format have the same data structure, and wherein said first track data format includes a first predetermined number of sync blocks when said first track data is reproduced, and said second track data format includes a second predetermined number of sync blocks when said second track data is reproduced, said apparatus comprising:
- first detecting means for detecting said regular TDS information from said first signal area;
- second determining means for detecting said backup TDS information from said ID code in said predetermined sync block of said second signal area;
- and
- selecting means for selecting one of said regular TDS information and said backup TDS information.
Dependencies are inferred from the claim text.