ADIP demodulation method and apparatus

a demodulation method and adip technology, applied in the field of adip demodulation methods and apparatuses, can solve the problems of complex design, adip decoder errors during the demodulation process, and complex trigonometric function operations to be performed, so as to achieve good noise immunity and simplify the operation of trigonometric functions.

Inactive Publication Date: 2008-01-17
CHEN HAO CHENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0012] In view of the above-mentioned problems, an object of the invention is to provide an ADIP demodulation method and apparatus with good noise immunity for ADIP signal without using 8-bit analog-to-digital converters and complicated operations of the trigonometric functions.

Problems solved by technology

However, since noises may influence the channel bits, the ADIP decoder may have errors during the decoding process.
However, the method mentioned above needs to use 8-bit analog-to-digital converter (ADC) to convert the wobble signal into digital data, and complicated operations of trigonometric functions has to be performed accordingly.
Thus, the design is complicated and the cost is higher.

Method used

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Embodiment Construction

[0022] The ADIP demodulation method and apparatus of the invention will be described with reference to the accompanying drawings.

[0023]FIG. 2 shows a block diagram of an ADIP demodulation apparatus of the present invention. Referring to FIG. 2, the ADIP demodulation apparatus 20 includes a slicing unit 21, a clock generator 22, a phase locked loop (PLL) 23, a channel bit generator 24, and an ADIP decoder 25.

[0024] The slicing unit 21 receives a wobble signal WOBS and slices the wobble signal WOBS into a binary signal with levels of 1 and 0 according to a slicing level. The binary signal is defined as a wobble pulse WOBPUS. The cycle length of the wobble pulse WOBPUS is 32 T, wherein T is the basic pulse length. The clock generator 22 generates a reference clock WCK according to the wobble pulse WOBPUS. The reference clock WCK is a reference signal with frequency higher than the wobble pulse WOBPUS, and the cycle length thereof is 2 T or 1 T, for example. The phase locked loop 23 g...

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Abstract

An ADIP demodulation method and apparatus, which are used in an optical disk driver to generate the ADIP information according to a wobble signal. The apparatus includes a slicing unit for receiving the wobble signal and generating a wobble pulse, a phase locked loop for generating a reference wobble signal with the same frequency and phase as the wobble pulse and a reference clock with frequency higher than the wobble pulse, a channel bit generator for generating a channel bit signal according to the reference wobble signal and the wobble pulse, and a decoder for decoding to ADIP information according to the channel bit signal. The channel bit generator generates a difference signal between the wobble pulse and the reference wobble signal, and outputs the channel bit signal according to the difference signal.

Description

[0001] This application is Continuation of co-pending application Ser. No. 10 / 623,576 filed on Jul. 22, 2003 and for which priority is claimed under U.S.C. §120. This application claims priority to Application No. 091116530 filed in Taiwan, Republic of China on Jul. 24, 2002 under 35 U.S.C. §119, the entire content of both of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the invention [0003] The invention relates to an ADIP (Address In Pre-groove) demodulation method and apparatus, and more particularly to an ADIP demodulation method and apparatus, which generates a difference signal between the wobble signal and the reference wobble signal and outputs the channel bit signal according to the difference signal. [0004] 2. Description of the Related Art [0005] In the DVD+R (Recordable Digital Versatile Disk) or DVD-+RW (Rewritable Digital Versatile Disk), the ADIP (Address In Pre-groove) records the address of each track zone so as to locate ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G11B7/00G11B7/005
CPCG11B7/0053
Inventor CHEN, HAO-CHENGWU, WEN-YI
Owner CHEN HAO CHENG
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