Auto-write strategy system for optical disc recording

Kishigami, Tomo; Tsukahara, Osamu; Kiyose, Y.; Takeshita, Nobuo

doi:10.1109/tce.2007.339518

Cited by 6 publications

(4 citation statements)

References 1 publication

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“…The control scheme implemented in the DSP fine-tunes the WPT, leading to well-formed pits and lands recorded on the disc. This is called the write strategy [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…Developing an on-line auto-write strategy for optical recorders has been highly desired because it saves a lot of time and human effort to fine-tune the write strategy parameters. Different on-line calculation schemes have been proposed to determine the write strategy parameters by measuring pulse widths and RF signal levels [ 4 , 5 ]. However, the write strategy parameters learned by both on-line calculation schemes are not optimized.…”

Section: Introductionmentioning

confidence: 99%

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On-Line Learning of Write Strategy for Ultra-Speed CD-RW Optical Recorder

Yao

Huang²

2018

Sensors

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An on-line machine learning approach integrating the genetic algorithm (GA) and jitter measurements is proposed to learn the write strategy for the infrared diode of ultra-speed CD-RW recorders. The recording performance differs significantly for the CD-RW discs recorded for the first, second, or third time above. It is difficult to learn one set of write strategy parameters for the infrared diode of ultra-speed CD-RW recorder that satisfies the recording specifications for three different types of discs. The GA is applied to the on-line learning of write strategy. However, the convergence of GA stagnates at the final stage of the learning process due to the fact that the write strategy parameters learned by the GA need to satisfy the recording specifications for discs recorded for the first time, second time and third time within one recording trial. To overcome this difficulty, a scheme called dynamic parameter encoding is proposed. This scheme improves the GA convergence and explores the search space much better than the conventional GA.

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“…The control scheme implemented in the DSP fine-tunes the WPT, leading to well-formed pits and lands recorded on the disc. This is called the write strategy [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On-Line Learning of Write Strategy for Ultra-Speed CD-RW Optical Recorder

Yao

Huang²

2018

Sensors

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“…[1][2][3][4][5][6][7][8] Write strategy optimization methods to realize stable optical disc recording have been actively investigated. [9][10][11][12][13][14][15][16][17][18][19][20][21] The optical disc drives usually determine the write strategy for a disc at the start of the recording operation and subsequently use the determined write strategy until the recording operation is completed. On the other hand, some commercial discs already released into the market have a variety of recording characteristics depending on the recording position in the radial direction.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Write Strategy Optimization Method for Optical Discs

Takeshita

Kishigami

Ikuta

et al. 2012

Jpn. J. Appl. Phys.

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The structural and optical properties of GaN epilayers grown on intentionally strained sapphire (0001) substrates by metalorganic chemical vapor deposition (MOCVD) were investigated. Intentionally tensile strained sapphire substrates were prepared by the implantation of 2.4 MeV energy Cl þ and As þ -ions with a 10 15 cm À2 dose where the projection ranges (R p ) were 1.16 mm and 0.95 mm, respectively. It was found from Raman spectroscopy that the compressive stress normally existed in the GaN epilayer/sapphire was decreased by the use of a Cl þ -ion-implanted sapphire substrate. The intentionally tensile strained sapphire surface can result in a superior crystalline GaN epilayer on top of it. However, excessively roughened and modified surface by As þ -ions degraded the GaN epilayer. Not only the ionic radius but also the chemical species of implanted ions in sapphire affected the crystal quality of GaN epilayers. Therefore, we concluded that the properly tensile-strained sapphire (0001) substrate could improve the properties of GaN epilayers grown by MOCVD.

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“…To solve these problems, many investigations have been carried out on WS optimization. [4][5][6][7][8][9][10][11] In this paper, we propose a new WS parameters optimization method for BD-recordable (BD-R) and BDrewritable (BD-RE) discs with a two-step search process that can obtain the properly optimized WS parameters within a short time. This method can satisfy the target jitter value of less than 7% and the optimization time is significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

Write Strategy Optimization Method with Two-Step Search for Blu-ray Disc Recording

Takeshita

Kanatake

Kishigami

et al. 2010

Jpn. J. Appl. Phys.

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A new write strategy (WS) optimization method with a two-step search process for Blu-ray Disc (BD) recording is developed to shorten the optimization time. This method is realized by the WS optimization system, which is constructed with an optical pickup, a disc tester, and the WS optimization algorithm. The optimization is executed according to the two-step search process along the mathematical axis, which is experimentally derived from the sample WS parameters. As the experimental result, the optimization time is reduced by nearly two-thirds from that achieved using the conventional method performed by the experts. All the jitter values of the playback signal derived from the recorded marks are smaller than the 7% target value and the effectiveness of this new method is experimentally confirmed.

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Auto-write strategy system for optical disc recording

Cited by 6 publications

References 1 publication

On-Line Learning of Write Strategy for Ultra-Speed CD-RW Optical Recorder

On-Line Learning of Write Strategy for Ultra-Speed CD-RW Optical Recorder

Real-Time Write Strategy Optimization Method for Optical Discs

Write Strategy Optimization Method with Two-Step Search for Blu-ray Disc Recording

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