Fetch channel device and its method

A channel device and sampling rate technology, applied in the field of optical storage systems, can solve problems such as delay time reducing the performance of high-speed optical storage systems

Inactive Publication Date: 2005-04-20
MEDIATEK INC
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  • Application Information

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Problems solved by technology

Although this patent pending greatly reduces the sampling frequency, the delay time due to the upsampler reduces the performance of high-speed optical storage systems

Method used

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  • Fetch channel device and its method
  • Fetch channel device and its method

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Embodiment Construction

[0018] refer to figure 1 Features of the present invention will become more apparent with reference to FIGS. 2A-2G and the following detailed description. Such as figure 1 As shown, the read channel device 200 is suitable for reading data recorded in an optical storage system at a predetermined baud rate. The analog read signal A(t) generated from the optical storage system is asynchronously sampled by the sampling device 202 (that is, the analog-to-digital converter ADC) to generate a sequence of asynchronous sampling values ​​A K . The sampling device 202 operates according to a clock with a fixed frequency fs, which is the sampling clock 240 provided by the clock source 220 . Asynchronously sampled values ​​of the sequence A K The relationship with the analog read signal A(t) can be expressed as

[0019] A K ={...,A(0),A(τ),A(2τ),...,A(kτ),...}

[0020] where k is an integer and τ=1 / fs. In Figure 2A, the analog read signal A(t) is represented by a solid line and the...

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Abstract

Read channel device for reading data recorded on an optical storage system at a given baud rate, which asynchronously samples the analog read signal from the optical storage system and subtracts from the resulting asynchronous sampled value Estimating the deviation value of the DC component to obtain a sequence of asynchronously removed DC component sampling values. The asynchronous DC component-removed sampled values ​​are interpolated separately by two interpolation devices, each generating a sequence of synchronous even-time sampled values ​​and a sequence of synchronously odd-time sampled values. Then, these synchronous even-time and synchronous odd-time sampling values ​​are respectively equalized by two equalization devices according to a target frequency spectrum, and each generates a sequence of even-time equalized sampling values ​​and a sequence of odd-time equalized sampling values. Wherein, the estimated DC component deviation value is estimated by a DC component deviation estimation device from even-time and odd-time equalized sampling values, and the two interpolation devices are controlled by a timing recovery control device so that even Time and odd time sampling values ​​are synchronized to the baud rate.

Description

technical field [0001] The invention relates to an optical storage system, in particular to a reading channel device and method suitable for the optical storage system. Background technique [0002] In recent years, the development of new optical recording media and data compression technology has made it possible to use optical storage systems to obtain huge data capacities. Optical storage systems can be used to store audio information, such as music CD players (CD players), as well as video and computer information, such as CD-ROMs and, more recently, DVD players. ). Information is usually recorded in binary form representing "0" and "1" bits by writing a series of "pits" onto optical media. When reading the data recorded on the optical media, an optical pick-up head on the rotating optical disc will detect the change of reflected light and generate an analog read signal. The analog read signal is then detected and decoded by a read channel circ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/09G11B7/005G11B20/10H03H7/30
Inventor 黄克强王梓百
Owner MEDIATEK INC
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