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Multitrack optical disc reader

A technology for readers and optical pickups, applied in instruments, optical recording heads, recording/reproducing with optical methods, etc., can solve the problem of increasing the number of integrated circuit gates

Inactive Publication Date: 2008-04-16
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, hard-wired FIFO buffers greatly increase the gate count of any integrated circuit that incorporates them, so a compromise needs to be found between using a small FIFO, i.e. low gate count, and achieving fast access

Method used

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  • Multitrack optical disc reader
  • Multitrack optical disc reader
  • Multitrack optical disc reader

Examples

Experimental program
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Effect test

Embodiment Construction

[0012] refer to figure 2 , the figure shows an optical disc reader 1 comprising figure 1 All the features of a multitrack disc reader, except that the disc reader can use fewer tracks than the maximum number of tracks the pickup can read. Also, according to the present invention, a FIFO buffer can be dynamically defined in the general memory bank 21 .

[0013] For ease of illustration, it is assumed that only the inner, outer and middle tracks of a five-track optical pickup are used, so that only data from these tracks flows into integrated circuit 12, where the data streams are combined and the combined data is decoded. Since two of the five tracks are not used, a third-section FIFO buffer can be defined in bank 21 with a storage capacity two-thirds higher than that achievable using all five tracks . Therefore, any continuous data bursts that transfer data from the FIFO buffer to the off-chip fast access SDRAM memory 18 subsequently increase by two-thirds, thereby improv...

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PUM

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Abstract

A multitrack optical disc reader ( 1 ) is disclosed comprising a multitrack optical pick up ( 11 ) for reading data from multiple tracks of an optical disc ( 10 ) and outputting the data from each track in respective data rams, and multiple first-in-first-out (FIFO) memories ( 21 ) for temporarily storing the data streams. In accordance with the present invention, wherein the pickup may selectively output data streams from less than the maximum number of tracks that can be read by the pickup, the multiple FIFO memories are provided in a common memory bank, and when less than the maximum number of tracks are being read by the pickup, the size of at least one FIFO memory in use is greater than the total available FIFO memory in the common memory bank divided by the maximum number of tracks that can be read by the pickup.

Description

technical field [0001] The present invention relates to a multi-track optical disc reader, comprising a multi-track optical pickup for reading data from multiple tracks of an optical disc and outputting data from each track in the form of individual data streams, and for temporarily First-in-first-out (FIFO) buffers that store data in each data stream. Background technique [0002] figure 1 Schematically shows a conventional optical disc reader 1, which includes a device for reading data from five adjacent tracks of an optical disc 10 and outputting the data read from each track in the form of five data streams multi-track optical pickup 11. Each data stream is fed to an integrated circuit 12 where the data streams are combined and the combined data is decoded. Specifically, each data stream is fed into a front-end (FE) processing circuit 13 which recovers and demodulates the bit data, which is then temporarily stored in a FIFO buffer 14 . Starting from the FIFO buffer, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/14G11B20/10G11B7/005
CPCG11B7/14G11B20/10
Inventor A·吉比拉
Owner NXP BV