Demodulation method for CD dither signal and equipment thereof
A technology of jittering signal and demodulation device, which is applied in the direction of head configuration/installation, driving/moving recording head, tracking search/alignment, etc., which can solve the problems of complicated demodulation device, large size, long demodulation time, etc.
Inactive Publication Date: 2005-03-16
LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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[0021] However, analog components such as an analog mixer, an interval integrator, and a sampling supporter are required for this purpose, so the demodulation device is complicated and enlarged. In addition, in order to demodulate the sawtooth jitter signal, it is necessary to A total of 56 rated jitter lengths (NWL0-55) that constitute an ADIP unit are all integrated sequentially, so there is a problem of long demodulation time
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[0039] First of all, the demodulation method and device of the optical disc wobble signal of the present invention, according to the Korean patent application No. 02-007943 (application date: February 14, 2002) patent document that the applicant has applied for In the jitter signal demodulation method described in detail, the peak detection (PEAKDETECTION) method is used to perform pre-coding (pre-coding) and modulate the MSK jitter signal recorded on the optical disc for demodulation, and at the same time, use the bandpass shown in the present invention Simple references such as filters (BPF) and level detectors Figure 1 to Figure 3 The sawtooth dither signal is demodulated. The specific embodiments of the method and device for demodulating the disc wobble signal of the present invention will be described in detail below with reference to the accompanying drawings.
[0040] Figure 5 It is a structural diagram of the demodulation device of the disc wobble signal of the pre...
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The invention relates to the demodulation equipment of the disc jitter signal and its solution. When demodulating individually the MSK jitter sequences corresponding to the MSK jitter signal included in the analog jitter signal read from the disc, and the sawtooth jitter sequences corresponding to the sawtooth jitter signal included in the analog jitter signal mentioned above, according to the synchronizing detect error signal of the jitter signal, assign an arbitrary sequence of the MSK jitter sequences and the sawtooth jitter sequences mentioned above to be the original jitter data sequence. Then the output of the demodulation is considered to be the address information. By this means, the jitter signal of the ADIP unit composed of the MSK jitter and the sawtooth jitter can be accurately and rapidly demodulated through the simple digitally constructed equipment.
Description
(1) Technical field [0001] The present invention relates to a method and device for demodulating optical disc wobble signals, in particular to the demodulation of optical disc wobble signals for demodulating wobble signals recorded as physical address information on optical discs such as recordable CDs or DVDs. Tuning method and its device. (2) Background technology [0002] Existing recordable optical discs, such as DVD-RAM or DVD-RW (Re-writable), need to record physical address information in advance on the recording surface of optical discs such as DVD-RAM or DVD-RW (Re-writable), so that they can arbitrarily access or retrieve the recording position of data. The wobble signal addressing method of recording the above physical address information as a wobble signal to an optical disc will be described in detail below. [0003] Firstly, the case of the above-mentioned DVD-RAM will be described. In order to enable physical addressing, the CAPA (complementary allocated) is ...
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IPC IPC(8): G11B7/09G11B21/10
Inventor 朱元培朴廷培徐相运
Owner LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI