Apparatus for recording compressed digital information to an optical disc

• US 5,224,087 A
• Filed: 08/19/1991
• Issued: 06/29/1993
• Est. Priority Date: 08/24/1990
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Nagashima, Hideki, Ando, Ryo, Maeda, Yasuaki
• Primary Examiner(s): Sniezek, Andrew L.
• Assistant Examiner(s): EDUN, MUHAMMAD N
• Application Number:
  US07/747,182
• Time in Patent Office: 680 Days
• Field of Search: 369/54, 369/53, 369/58, 369/59, 369/47, 369/48, 369/49, 369/32, 369/44.32, 369/33, 369/116, 369/124, 395/425
• US Class Current: 369/53.12
• CPC Class Codes: G11B 11/10504 Recording for shaping of magnetic domains G11B11/10528, for compensation of shift G11B11/1053
• CPC Class Codes: G11B 11/10595 Control of operating function
• CPC Class Codes: G11B 20/00007 Time or data compression or expansion audio compression based on psychoacoustics G10L19/00; data processing for reproducing audio data at different playback speeds G10L21/04; video compression H04N19/00; data compression per se H03M7/30
• CPC Class Codes: G11B 20/10 Digital recording or reproducing
• CPC Class Codes: G11B 20/1254 for mixed data, i.e. continuous and discontinuous data
• CPC Class Codes: G11B 2020/1277 for managing gaps between two recordings, e.g. control data in linking areas, run-in or run-out fields, guard or buffer zones
• CPC Class Codes: G11B 2220/2525 Magneto-optical [MO] discs
• CPC Class Codes: G11B 27/034 on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/36 Monitoring, i.e. supervising the progress of recording or reproducing for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, see H04N17/06
• 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

Abstract

An apparatus for recording compressed digitized information to an optical disc by reading the digital data into a memory for transient storage. The digital input data thus written into the memory are sequentially read out of the memory and into an encoder at a transfer rate faster than the input transfer rate where the digital data are arranged in discrete clusters of record units including cluster-linking groups such that each record unit can be interleaved independently and without affecting other record units. The interleaved record units are then recorded onto an optical disc. Reproduction of the record units from the optical disk is carried out by reversing the process.

Claims

1. An optical disc recording apparatus for recording digital data on a disc-shaped recording medium by optical means comprising:

memory means for transiently storing input digital data compressed from a digitized analog signal,

signal processing means for reading digital data out from the memory means and arranging it into a plurality of clusters at an interval of a predetermined number of sectors, separating each of the clusters by a cluster-linking group, each cluster-linking group including a plurality of sectors such that the cluster-linking group extends beyond data within a cluster to be interleaved in an interleaving operation, and encoding the digital data of the clusters by the interleaving operation,

memory control means for performing a readout control of the memory means for reading a predetermined amount of the recording data on a cluster-by-cluster basis when an amount of the input digital data stored in the memory means exceeds a present first predetermined amount of data to maintain a writable space larger than a second predetermined amount of data in the memory means,

recording means for continuously recording digital data encoded by the signal processing means on a recording track of the disc-shaped recording medium,

abnormality detection means for detecting abnormalities in the recording operation by the recording means, and

resetting control means connected to the recording means and the abnormality detecting means for inhibiting the recording operation and for resetting the recording means from an abnormal state to a normal state upon detection of an abnormality by the abnormality detection means.

2. An optical recording apparatus as claimed in claim 1 wherein the memory control means is connected to the abnormality detection means and performs a control operation for again reading out from the memory means, after resetting of the recording means by a resetting control by the resetting control means, record data which could not be recorded because of an abnormality occurring during the recording operation.

3. An optical recording apparatus as claimed in claim 1 wherein the second predetermined amount of data is in excess of an amount of input data inputted to the memory means during the time of resetting the recording means from an abnormal state to a normal state.

4. An optical disc recording apparatus as claimed in claim 3 wherein the first predetermined amount of digital data corresponds to an amount of data for one cluster of data.

5. An optical disc recording apparatus as claimed in claim 1 wherein the cluster-linking group is constituted by dummy data not affecting the digital data in the cluster.

6. An optical disc recording apparatus as claimed in claim 1 wherein each sector corresponds to one block (98 EFM frames) of a compact disc.

7. An optical disc recording apparatus as claimed in claim 1 wherein the abnormality detection means detect detracking and defocusing to check for an abnormality in the recording operation.

8. An optical disc recording apparatus for recording digital data on a disc-shaped recording medium by optical means comprising:

memory means in which input data digitized from analog signals are sequentially written and from which the input data thus written are read out as record data having a transfer rate higher than the transfer rate of the input data,

signal processing means for arranging digital data read out from the memory means into a plurality of clusters at intervals of a predetermined number of sectors, inserting between each of the clusters a cluster-linking group of sectors such that the cluster-linking group extends beyond data in a cluster to be interleaved in an interleaving operation, and encoding the digital data of the clusters by the interleaving operation,

memory control means for performing a readout control of said memory means for reading a predetermined amount of said recording data on a cluster-by-cluster basis when an amount of data of said input digital data stored in said memory exceeds a present first determined amount of data to maintain a writable space larger than a second predetermined amount of data in the memory means,

recording means for continuously recording digital data encoded by the signal processing means on a recording track of the disc-shaped recording medium,

abnormality detection means for detecting abnormalities in the recording operation by the recording means, and

resetting control means connected to the recording means and the abnormality detecting means for inhibiting the recording operation and for resetting the recording means from an abnormal state to a normal state upon detection of an abnormality by the abnormality detection means.

9. An optical recording apparatus as claimed in claim 8 wherein the memory control means is connected to the abnormality detection means and performs a control operation for again reading out from the memory means, after resetting of the recording means by a resetting control by the resetting control means, record data which could not be recorded because of an abnormality occurring during the recording operation, and wherein the recording means records on the disc-shaped recording medium record data thus again read out of the memory means at recording positions contiguous to record data recorded before the detection of an abnormality.

10. An optical recording apparatus as claimed in claim 8 wherein the second predetermined amount of data is in excess of an amount of input data inputted to the memory means during the time of resetting the recording means from an abnormal state to a normal state.

11. An optical disc recording apparatus as claimed in claim 10 wherein the first predetermined amount of digital data corresponds to an amount of data for one cluster of data.

12. An optical disc recording apparatus as claimed in claim 8 wherein the cluster-linking group is constituted by dummy data not affecting the digital data in the cluster.

13. An optical disc recording apparatus as claimed in claim 8 wherein the abnormality detection means detect detracting and defocusing to check for an abnormality in the recording operation.

14. An optical disc reproducing apparatus as claimed in claim 8 wherein the abnormality means includes means for inhibiting the recording operation on detection of the abnormality in the recording operation by lowering the laser power of the recording means.