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Disk reproducing system

A regeneration system and detection mechanism technology, applied in the recording of information on the magnetic disk, instruments, magnetic recording, etc., can solve the problem that the reading speed cannot be generated, the highest regeneration speed cannot be brought out, and the reading speed exceeds the processing capacity of the system, etc. question

Inactive Publication Date: 2005-08-03
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the usual disk reproduction system, although the maximum allowable track pitch has to be used to determine the reproduction speed at the outermost peripheral position, there are occasions where the disk whose track pitch is smaller than the allowable maximum value is reproduced in this way, the system There is a problem that the highest regeneration speed cannot be played out
[0009] That is to say, although the track pitch of CD-ROM has a range of 1.5 to 1.7∏m in the specification, there are actually disks out of the specification, so for disks with a value that deviates from the standard track pitch (1.6∏m) , there are occasions where the target reading speed cannot be produced, or the reading speed exceeds the processing capacity of the system

Method used

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Experimental program
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no. 1 Embodiment

[0023] Below with Fig. 1 just corresponding to claim 1 of the present invention and the invention of claim 2

[0024] The first embodiment will be described.

[0025] FIG. 1 is a block diagram of a CAV reproducing system according to a first embodiment of the present invention.

[0026] 2 is an information disc whose data is recorded at a constant linear velocity, and the aforementioned information disc 2 has a certain range of allowable errors regarding the linear velocity, the track pitch, and the innermost peripheral diameter of the data recording area recorded on the aforementioned information disc 2 . 1 is a pickup for reading information from the aforementioned information disc 2, such as an optical pickup, a magnetic head, and the like. 3 is an amplifier circuit, which amplifies the signal read by the pickup 1 into an appropriate amplitude. 16 is a disk motor, which rotates the information disk 2 at a predetermined speed. 4 is a servo control circuit, which controls ...

no. 2 Embodiment

[0034] use below figure 2 A second embodiment of the invention corresponding to claim 3 and claim 4 of the present invention will be described.

[0035] figure 2 Fig. 2 is a block diagram applied to a CD-ROM CAV reproduction system according to the second embodiment of the present invention. When the pickup does not have a mechanism for detecting the moving distance of the information disc, the rotational speed of the disc motor can be obtained by the following method. Note that the same reference numerals are assigned to the same configurations as those of the above-mentioned first embodiment, and description thereof will be omitted.

[0036] according to figure 2 , 21 is an optical pickup for reading data recorded on the information disc 2 . 23 is an RF amplifier for supplying an RF (radio frequency) signal read out by the aforementioned optical pickup 21 . 24 is a focus / tracking control circuit / feed motor control circuit for supplying a focus error signal or a tracking...

no. 3 Embodiment

[0121] The following just corresponds to the 3rd of the invention of claim 5 and claim 6 of the present invention

[0122] Examples will be described.

[0123] First, the value of the maximum diameter of the data recording area described in the above-mentioned first and second embodiments can be obtained by the following method.

[0124] For example, there is a method of extracting address information recorded on the information disc by a pickup, and taking the diameter at the outermost peripheral position as the maximum diameter of the data recording area based on the extracted address information.

[0125] In addition, there is a method of providing an information disk with a storage means for storing the outermost peripheral address information read every time the information disk is reproduced, and using the outermost peripheral data recording area as the maximum diameter by the storage means.

[0126] Furthermore, there is a method of taking the maximum recording time on...

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Abstract

A disk reproducing system comprising a pickup (1) for reading information from an information disk (2) on which data is recorded at a constant linear velocity, a disk motor (16) for turning the information disk (2), a digital signal processing means (7) for digitizing data according to the reproduction format of the disk (2), an interfacing means (19) for sending the digitized data to an external device, and a buffer memory (18) for storing temporarily the data, the system further comprising a means for detecting the linear velocity and traffic pitch of the disk (2) to determine a speed control reference value of the disk motor (16) from the detected linear velocity and traffic pitch and from a maximum diameter of a data recording region, whereby a highest reproduction velocity of the system can be obtained even on disks with different traffic pitches.

Description

technical field [0001] The present invention relates to a disc reproduction system used in a CD-ROM reproduction device and the like, and more particularly to a disc reproduction system for controlling the rotational speed of the disc. Background technique [0002] Conventional methods for controlling the rotation speed of disks in disk regeneration systems include CAV (Constant Angular Velocity) control with constant angular velocity, CLV (Constant Linear Velocity) control with constant linear velocity, and combinations of CAV control and CLV control. Up PCAV control. Among them, CLV control has various problems such as a delay in access time, increased power consumption, and heat generation because the spindle motor needs to be frequently accelerated and decelerated during access. Therefore, recently, with the increase in speed of CD-ROM devices, it has become common to use CAV control or PCAV control when reproducing a disk in which data is recorded in the CLV system. ...

Claims

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Application Information

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IPC IPC(8): G11B7/00G11B19/06G11B19/12G11B19/28G11B21/08
CPCG11B21/083G11B19/28G11B21/081G11B19/06G11B19/128G11B7/00
Inventor 高桥赖雄
Owner PANASONIC CORP