Data recording and reproducing apparatus

Assignee: Sharp Corp

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Filing: 1993-01-22

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Granted: —

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Expires: 2013-01-22

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Abstract

Abstract A data recording and reproducing apparatus uses a rewriteable optical disk (1) with pre-recorded absolute address information, and comprises a data compression circuit (23, 20) for dividing and compressing continuous digital data into compressed plural data blocks, an expansion circuit (21, 28) to restore the compressed data to the original expanded form, and a buffer memory (19). Data is compressed in discrete data blocks and is recorded sequentially block by block to the optical disk. The compressed data is likewise read block by block from the disk during data reproduction. Using the data expansion circuit to expand the compressed data one block at a time, the data recording and reproducing apparatus can reproduce the original continuous digital data stream. Plural continuous digital data selections can thus be reproduced by alternately fetching data for the plural selections from the disk in compressed data block units and temporarily storing the data to a buffer memory for expansion.

Inventors

👤 Kunio Kojima
👤 Shigemi Maeda
👤 Jun Akiyama

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-06 09:37

CPC Classifications

G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/24; G11B7/00; G11B7/08; G11B20/00; G11B20/00007; G11B20/10; G11B27/102; G11B27/105; G11B27/11; G11B27/28; G11B27/32; G11B27/327; G11B27/329; G11B20/10527; G11B2020/10537; G11B2020/10592; G11B2020/10935; G11B2020/10953; G11B2220/00; G11B2220/20; G11B2220/21; G11B2220/215; G11B2220/216; G11B2220/25; G11B2220/2525; G11B2220/2529; G11B2220/2537; G11B2220/2545; G11B2220/60; G11B2220/65

Claims Analysis

Total Claims: 5

Claim 1

Independent Claim 77 words

A data recording apparatus for recording input data on a recording medium in compressed data blocks comprising: data dividing means (23) for dividing input data into a plurality of blocks; data compression means (20) for compressing input data in each block to produce a compressed data block; buffer memory means (19) for temporarily storing a predetermined number of compressed data blocks; and recording control means (11, 5, 6) for recording compressed data blocks on said recording medium.

Claim 2

Dependent Claim 93 words

A data reproducing apparatus for reproducing compressed data blocks stored in a recording medium comprising: reading means (3, 7, 12) for reading compressed data blocks from at least first and second areas on said recording medium, alternatively; buffer memory means (19) for temporarily storing the read compressed data blocks to define a first train of compressed data blocks (110, 111, 112) and a second train of compressed data blocks (210, 211, 212); and data expansion means (21, 28) for expanding at least one of said first and second trains of compressed data blocks.

Claim 3

Dependent Claim 35 words

A data reproducing apparatus as claimed in Claim 2, wherein said data expansion means comprises first and second data expansion circuits (21, 28) for simultaneously expanding said first and second trains of compressed data blocks.

Claim 4

Dependent Claim 47 words

A data reproducing apparatus as claimed in Claim 2, wherein said data expansion means comprises selection switch means (SW) for selecting one of said first and second trains of compressed data blocks and one data expansion circuit (21) for expanding the selected train of compressed data blocks.

Claim 5

Dependent Claim 165 words

A data recording/reproducing apparatus for recording input data on a recording medium in compressed data blocks and for reproducing compressed data blocks from the recording medium comprising: data dividing means (23) for dividing input data into a plurality of blocks; data compression means (20) for compressing input data in each block to produce a compressed data block; buffer memory means (19) for temporarily storing a predetermined number of compressed data blocks; recording control means (11, 5, 6) for recording compressed data blocks on said recording medium. reading means (3, 7, 12) for reading compressed data blocks from at least first and second areas on said recording medium, alternatively; said buffer memory means (19) for temporarily storing the read compressed data blocks to define a first train of compressed data blocks (110, 111, 112) and a second train of compressed data blocks (210, 211, 212); and data expansion means (21, 28) for expanding at least one of said first and second trains of compressed data blocks.

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