# US 5,353,276 A · Process for recording and/or reproducing digital data on a record carrier

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- Number: US 5,353,276 A
- Document ID: US5353276A
- Status: Granted
- Kind: A
- Application number: 07/948,082
- Filed: 1992-09-21
- Granted: 1994-10-04
- Earliest claimed: 1990-03-12
- Assignees: Deutsche Thomson-Brandt GmbH
- Inventors: Ernst F. Schroder
- Web page: https://patentgrep.com/patent/US5353276A

## CPC

- G11B 27/24: by sensing features on the record carrier other than the transducing track {; sensing signals or marks recorded by another method than the main recording}
- G11B 20/10: Digital recording or reproducing
- G11B 20/1251: {for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data}
- G11B 20/1879: {Direct read-after-write methods}
- G11B 27/036: Insert-editing
- G11B 27/105: {of operating discs}
- G11B 27/329: {on a disc [VTOC]}
- 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)}
- G11B 20/1217: {on discs}
- G11B 27/034: on discs (G11B27/036, G11B27/038 take precedence)
- G11B 27/107: {of operating tapes}
- G11B 27/3027: {used signal is digitally coded}
- G11B 2020/10592: {specifically adapted for recording or reproducing multichannel signals}
- G11B 2020/183: {wherein at least one additional attempt is made to read or write the data when a first attempt is unsuccessful}
- G11B 2220/218: Write-once discs
- G11B 2220/2525: Magneto-optical [MO] discs
- G11B 2220/2529: Mini-discs
- G11B 2220/2545: CDs
- G11B 2220/90: Tape-like record carriers
- G11B 2220/913: Digital audio tape [DAT] format
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

A method of recording bursts of digital data onto a rotating recording medium having a helical data track moving at a fixed linear rate with respect to a read/write unit includes the steps of temporarily storing the data bursts and reducing the data rate of the bursts during storage. The bursts are stored as clusters at spaced locations around the track while leaving pauses between the clusters. The pauses are used to relocate the read/write head to the position where the next burst will be recorded before recording the next burst.

## Claims

### Claim 1

A method of recording bursts of digital data onto a rotating recording medium having a helical data track moving at a fixed linear rate with respect to a read/write unit comprising the steps of:
temporarily storing said data bursts and reducing the data rate of said bursts during said storage;
recording said bursts as clusters at spaced locations around said track while leaving pauses between said clusters;
utilizing said pauses to relocate said read/write head before recording the next burst.

### Claim 2 (depends on 1)

The method of claim 1 wherein each of said clusters has a predetermined number of frames.

### Claim 3 (depends on 2)

The method of claim 2 wherein at least one frame of each cluster is used to code the location of the cluster.

### Claim 4 (depends on 3)

The method of claim 3 wherein at least one of the frames in each cluster is used to code the location of the next cluster.

### Claim 5 (depends on 3)

The method of claim 3 wherein each of said clusters includes an error reduction code.

### Claim 6 (depends on 5)

The method of claim 5 further including the steps of reading the last recorded cluster prior to recording the subsequent cluster onto said recording medium, and rerecording any cluster found to be defective.

### Claim 7

A record for storing and playing digital data representative of an analog signal digitized at a first data rate comprising:
a helical data track, said data track including a plurality of data clusters, each of said data clusters being composed of a plurality of frames and each of said cluster representing a burst of data having a data rate lower than said first data rate, at least one frame of each cluster having a code for identifying the cluster; and
a plurality of pauses between said clusters, said pauses providing operation time for a recording/play-back unit useful with said record.

### Claim 8 (depends on 6)

The record of claim 6 wherein at least one frame of each of said clusters includes a code for locating another cluster frame of said record.

### Claim 9

A system for recording a digital representation of an analog signal onto a recording medium comprising:
means for receiving said analog signal and converting said analog signal into a first digital signal having a first data rate;
means for compressing said first digital signal into a second digital signal having second data rate lower than said first data rate;
storage means for temporarily storing said second digital signal;
means for controlling said storage means and for dividing said second digital signal into a plurality of bursts separated by a plurality of pauses; and
means for providing said bursts and pauses to said recording medium.

### Claim 10 (depends on 8)

The system of claim 8 wherein said means for dividing includes means for dividing said second digital signal into a plurality of frames, and means for combining a preselected number of said frames into each of said bursts.