Adaptive-speed algorithms for CD-ROM systems

Stan, Sorin G.; Bakx, Jan L.

doi:10.1109/30.485460

Cited by 18 publications

(15 citation statements)

References 1 publication

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“…On one hand, as it has already been shown in [3], the CLV control becomes of no use when the optical head moves very fast from one location to another along the disc radius. Hence, the pure CLV mode should be avoided in those systems where very short seek times are desired.…”

Section: Sl + % ) ( S J T O T + D ) + Kmentioning

confidence: 97%

“…On the other hand, because the compact disc is prerecorded with a constant linear velocity, the CLV mode remains the only way t o control the spindle motor such that an absolute maximum in terms of bit rate will be achieved. There are two alternative solutions to this trade-off either implementing a full CAV control (which worsens the average bit rate of the engine) or implementing an adaptive-speed profile based on quasi-CLV control, as described in [3]. In turn, a wellimplemented adaptive-speed technique requires a suitable optimization.…”

Section: Sl + % ) ( S J T O T + D ) + Kmentioning

confidence: 99%

“…is the maximum rotational frequency the motor can achieve A speed profile varying linearly with the disc radius between two fixed overspeeds Nin and Nout has already been described in [3] and is given by with Rin and Rout being respectively the inner and outer disc radii. A formula for the average bit rate has also been given in the mentioned paper.…”

Section: E G O 2 70mentioning

confidence: 99%

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High-performance adaptive-speed/CAV CD-ROM drive

Stan

Kempen

Lin³

et al. 1997

IEEE Trans. Consumer Electron.

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Abstract-This paper describes a novel type of CD-ROM drive which can automatically distinguish between two basic operating modes: continuous playback and continuous access. The drive, based on the adaptive-speed technology, is optimized for a very high data throughput during sustained read-out using a new cubic overspeed profile. In addition, by detecting the state of continuous access and switching the spindle motor into a CAV (constant angular velocity) loop, the drive features very low power consumption. Two dedicated firmware algorithms which can detect one of the two operating modes either at the bit-engine level or at the data-path level are also presented. While implementing the algorithm at the data-path level, the paper will also approach a novel technique for the optimization of the data flow via controlling the speed of the spindle motor. A better buffer management can therefore be achieved. Last but not least, the cubic overspeed profile is shown to be optimal not only for sustained playback but also while the drive is performing either a unique seek action or a short sequence of seeks.

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Section: Sl + % ) ( S J T O T + D ) + Kmentioning

confidence: 97%

Section: Sl + % ) ( S J T O T + D ) + Kmentioning

confidence: 99%

Section: E G O 2 70mentioning

confidence: 99%

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High-performance adaptive-speed/CAV CD-ROM drive

Stan

Kempen

Lin³

et al. 1997

IEEE Trans. Consumer Electron.

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“…An important research topic for optical data storage systems such as CD-ROM and its successor DVD-ROM is the possibility to increase the rotational frequency of the disk to obtain faster data readout and shorter access time [28]. In this section we will show the importance of control design for performance improvement of optical storage drives.…”

Section: Servo Control Problemmentioning

confidence: 99%

Advanced Motion Control: An Industrial Perspective

Steinbuch

Norg

1998

European Journal of Control

119

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“…Higher bit rates can be achieved by rotating the disc at Nua, where Af defines the drive overspeed (Xfactor). The current CD-ROM drives are also able to read out data while spinning the disc in constant angular velocity6 (CAV) mode or when using any other speed profile [6].…”

Section: B the CD Data Structurementioning

confidence: 99%

Look-ahead seek correction in high-performance CD-ROM drives

Stan

Kempen²,

Leenknegt

et al. 1998

IEEE Trans. Consumer Electron.

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Abstract-As the performance of the CD-ROM drives continues t o increase, special attention should be paid t o any element in the system that disturbs the desired specifications. When very low access times are considered, it will be mandatory t o reach the target track within only one seek action, i.e. without any consequent retry or correction seek. Many CD-ROM drives count the tracks crossed during seeking and, by comparing this count with the pre-calculated seek length, the exact target location can be detected. This paper considers the error that affects the track-counting mechanism due t o the rotating disc spiral. It will be shown that, for a given seek length, the number of crossed tracks differs between outside-and inside-oriented seeks. The involved equations will be derived and an algorithm will be proposed for determining the correct number of tracks t o be crossed during a seek action. The proposed algorithm, which is optimized for microprocessor implementation, relies on two look-up tables and a learning scheme that allows look-ahead seek correction for both spiral rotation and system tolerances.

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Adaptive-speed algorithms for CD-ROM systems

Cited by 18 publications

References 1 publication

High-performance adaptive-speed/CAV CD-ROM drive

High-performance adaptive-speed/CAV CD-ROM drive

Advanced Motion Control: An Industrial Perspective

Look-ahead seek correction in high-performance CD-ROM drives

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