ADIP demodulation method and apparatus

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 ...

AI Technical Summary

Benefits of technology

"The invention provides an ADIP demodulation method and apparatus that can effectively filter out noise without using complicated operations of trigonometric functions. The apparatus includes a slicing unit, a phase locked loop, a channel bit generator, and an ADIP decoder. 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. This difference signal is used to generate ADIP information. The technical effect of this invention is to improve the accuracy and reliability of ADIP signal demodulation."

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.

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