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Cd-text reproduction device and cd-text processing circuit

A reproduction device and decoder technology, applied to instruments, digital recording/reproduction, optical recording/reproduction, etc., can solve the problems of increasing the processing load of microcomputers

Inactive Publication Date: 2006-03-15
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This becomes the main cause of increasing the processing load of the microcomputer, and also becomes the main cause of the delay of the disc reproduction process such as the display or audio output of the TEXT information decoded in the CD-TEXT decoder.

Method used

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  • Cd-text reproduction device and cd-text processing circuit
  • Cd-text reproduction device and cd-text processing circuit
  • Cd-text reproduction device and cd-text processing circuit

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0054] ===Composition of CD-TEXT playback device===

[0055] FIG. 1 is a diagram showing the configuration of a CD-TEXT playback device according to a first embodiment of the present invention. In addition, the CD-TEXT reproducing device of the present invention corresponds to the CD-DA standard related to the reproduction of audio information, especially the CD-TEXT standard included in the CD-DA standard, and the CD-ROM related to the reproduction of digital information such as application programs for computers. Specification. Furthermore, it may be an optical disc recording and reproducing system corresponding to the CD-R standard or CD-RW standard related to optical disc recording.

[0056] The optical pickup 101 is composed of a laser element, an objective lens, a photodetector, or a servo mechanism etc. (both are omitted from the illustrations). Information.

[0057] The preamplifier 102 generates an RF signal by amplifying a signal detected by the optical pickup 101...

no. 2 approach

[0098] ===Composition of CD-TEXT playback device===

[0099] Fig. 5 is a diagram showing the configuration of a CD-TEXT playback device according to a second embodiment of the present invention. Components that are the same as those shown in FIG. 1 are denoted by the same symbols, and description thereof will be omitted.

[0100] The CD-TEXT decoder 116 is an embodiment of the "decoder" of the second embodiment of the present invention. The CD-TEXT decoder 116 decodes TEXT information conforming to the CD-TEXT standard based on the sub-R to W data sent from the sub-code decoder 113 . And, every time the TEXT information is decoded, CRC is performed according to the CRC code included in the TEXT information, and it is checked whether the CRC result of the TEXT information is normal. The CRC result of the TEXT information is used to determine whether or not the TEXT information is recorded on the optical disc 100 .

[0101] In addition, when the CRC result is normal, the CD-T...

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PUM

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Abstract

The invention provides a high-speed CD regeneration device for the CD regeneration process. The invention is provided with a decoder which decodes the TOC information according to the sub Q data read out from a leading-in area of the CD; in the meantime, according to the read-out sub R to W data, the decoder decodes the TEXT information as judges whether the TEXT information exists. In addition, when the decoder decodes the TEXT information of a plurality of RARs, the decoder detects the error of the decoded TEXT information according to the error detection code in each RAR. Under the circumstance that the error detection result is normal, the decoder sends a first data set formed by the decoded head information and the TEXT content to a microcomputer; under the circumstance that the error detection result is abnormal, the decoder sends the second data set which has the same data as the first data set and shows that the error detection result is abnormal to the microcomputer.

Description

technical field [0001] The present invention relates to an optical disk reproducing device and a decoder. Background technique [0002] In an optical disc reproduction system that reproduces an optical disc conforming to the CD standard, various displays are performed based on information reproduced from the optical disc. For example, in all aspects of the CD standard, based on the Q channel data (hereinafter referred to as sub-Q data) recorded in the sub-code information of the lead-in area, track numbers or time information assigned to each track number, etc. are used as sub-code information. Q data is recorded in the lead-in area. Thus, in the optical disc reproduction system, various displays can be performed by reading the sub-Q data from the lead-in area and performing decoding / reproduction. [0003] Furthermore, there has been proposed a CD-TEXT standard for recording text information on an optical disc by adding text information such as album titles and song names ...

Claims

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Application Information

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IPC IPC(8): G11B20/10G11B7/00G11B20/12G11B27/00
Inventor 阿部浩一
Owner SANYO ELECTRIC CO LTD
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