# US 5,703,842 A · Information recording/reproducing apparatus for executing system control and servo control by single CPU

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- Number: US 5,703,842 A
- Document ID: US5703842A
- Status: Granted
- Kind: A
- Application number: 08/524,412
- Filed: 1995-09-06
- Granted: 1997-12-30
- Earliest claimed: 1994-09-08
- Assignees: Canon Kabushiki Kaisha
- Inventors: Nobuyuki Tonegawa
- Web page: https://patentgrep.com/patent/US5703842A

## CPC

- G11B 7/08505: {Methods for track change, selection or preliminary positioning by moving the head}
- G11B 21/083: {on discs}
- G11B 7/0037: with discs
- 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

An information recording/reproducing apparatus includes a single arithmetic device for executing, in parallel, system processing for processing a command from a host computer and servo control processing for positioning a recording/reproducing head on a target track. The arithmetic device executes preparation processing for a recording and/or reproducing operation to be executed after a seek operation, during the seek operation of the head to the target track. The preparation processing includes a setting operation of a frequency of a synchronous signal used for recording and/or reproducing information, modulation processing of recording data, or the like.

## Claims

### Claim 1

An information recording/reproducing apparatus comprising:
single arithmetic means for executing, in parallel, system processing for processing a command from a host computer and servo control processing for positioning a recording/reproducing head on a target track by interrupting the servo control processing into the system processing,
wherein said arithmetic means causes an interrupt frequency of the servo control processing to be made higher as the head nears the target track and sets a frequency of a synchronizing signal for recording and/or reproducing information when the interrupt frequency is low.

### Claim 2

An information recording/reproducing apparatus comprising:
single arithmetic means for executing, in parallel, system processing for processing a command from a host computer and servo control processing for positioning a recording/reproducing head on a target track by interrupting the servo control processing into the system processing; and
a memory for storing recording and/or reproducing data,
wherein said arithmetic means causes an interrupt frequency of the servo control processing to be made higher as the head nears the target track and effects data transfer processing between the host computer and the memory when the interrupt frequency is low.

### Claim 3

An information recording/reproducing apparatus comprising:
single arithmetic means for executing, in parallel, system processing for processing a command from a host computer and servo control processing for positioning a recording/reproducing head on a target track by interrupting the servo control processing into the system processing,
wherein said arithmetic means causes an interrupt frequency of the servo control processing to be made higher as the head nears the target track and effects address calculation for the target track when the interrupt frequency is low.