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Data reproduction apparatus for disk medium and judgement method for correctly reading subcode data

A technology for media data and reproduction equipment, applied in the directions of digital recording/reproduction, optical recording/reproduction, data recording, etc., which can solve problems such as finding operational obstacles and pickups running out.

Inactive Publication Date: 2005-02-02
FUNAI TECHNO SYST KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This defect is not only a fatal obstacle to the search operation, but also causes an accident in which the pickup runs out of the outermost circle of the data recording position of the disc.

Method used

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  • Data reproduction apparatus for disk medium and judgement method for correctly reading subcode data
  • Data reproduction apparatus for disk medium and judgement method for correctly reading subcode data
  • Data reproduction apparatus for disk medium and judgement method for correctly reading subcode data

Examples

Experimental program
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Embodiment Construction

[0014] An embodiment of the present invention will be described in detail below.

[0015] figure 1 It is a block diagram of the electrical structure of the disc media data reproducing device of the present invention. On the optical disc 1, data groups and subcode data indicating the positions or attributes of the data groups are recorded along spiral tracks. The pickup 2 is composed of a photodetection element for tracking, a photodetection element for focusing and reading data, and the like. The pickup 2 reads data recorded on the optical disc with light while the optical disc 1 is rotated by the spindle motor. And the read data is supplied to the signal processing circuit 4 . The signal processing circuit 4 is a part that performs predetermined processing on data supplied from the pickup 2 . The servo circuit control section 5 separates the subcode Q channel from the read data, thereby supplying the subcode Q channel to the microcomputer circuit 6 and supplying the data ...

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PUM

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Abstract

The apparatus comprises a data reading section reading subcode data recorded on the disk medium and corresponding main data recorded therewith, a sub Q code acquisition section separating sub Q codes from the subcode data read by the data reading section so as to acquire a plurality of sub Q codes corresponding to a plurality of serial subcode synchronizing signal, the sub Q code indicating an absolute time of the subcode data in the disk medium, a first condition judgement section generating a signal when each of the absolute time indicated by the sub Q code is identical with the others, a second condition judgement section generating a signal when the absolute time indicated by succeeding sub Q code is later within a predetermined time than that indicated by preceding sub Q code, and a final judgement section judging whether correct reading of the subcode data is performed when the signal from at least one section is detected.

Description

technical field [0001] This invention relates to a data reproducing apparatus for optical disc media for reproducing digital data from a digital optical disc, such as a compact disc, CDROM, etc., on which digital data is recorded along a spiral track, and more particularly to representing data Read operation of the subcode data of the position or attribute of the group (data body). Background technique [0002] Conventionally, data signals are recorded using a CLV (Constant Linear Velocity) system on an optical disc or CDROM used as a mass data recording medium. Furthermore, in this type of optical disc, data groups and subcode data representing the positions or attributes of the data groups are recorded along spiral tracks. [0003] In CD ROM, one data block (data area) is usually composed of 98 data frames. Each data frame has 24 bytes of data, of which 8 bytes are allocated to each subcode (channel P to W). The absolute time value of the data block is recorded in chann...

Claims

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Application Information

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IPC IPC(8): G11B7/005G11B19/04G11B20/12G11B27/30G11B27/36
CPCG11B19/04G11B20/1217G11B27/3063G11B7/005G11B27/36
Inventor 山上俊彦
Owner FUNAI TECHNO SYST KK