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Scrambler and scrambling method

A technology of scrambler and register, which is applied to instruments, TVs, color TVs, etc., and can solve the problem that the scrambler cannot respond correctly

Inactive Publication Date: 2005-05-04
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, when it is necessary to generate a random number with a cycle greater than 32K and corresponding scrambling is required, the previous random number generator and the scrambler using this generator cannot respond correctly

Method used

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  • Scrambler and scrambling method
  • Scrambler and scrambling method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0072] Example 1) General DVD

[0073] When data frame 1=2K(b), data frame 2=32K(B), and the capacity of the two tracks on the outermost circumference=284K, the random number generation period must be equal to or greater than 17.75K (=2K×284 / 32K), while the random number generation cycle of the scrambler in the actual DVD is 32K.

example 2

[0074] Example 2) The first case of HD-DVD with twice the tangential line density of DVD

[0075] When data frame 1 = 4K (b), data frame 2 = 64K (B), and the capacity of the two tracks on the outermost circumference = 568K (C), the random number generation cycle must be equal to or greater than 35.5K (= 4K ×568 / 64K).

example 3

[0076] Example 3) The second case of HD-DVD with twice the tangential line density of DVD

[0077] When data frame 1 = 8K (b), data frame 2 = 64K (B), and the capacity of the two tracks on the outermost circumference = 568K (C), the random number generation period must be equal to or greater than 71K (= 8K × 568 / 64K).

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Abstract

A scrambler and a scrambling method are provided. The scrambler has a random number generator for generating random numbers, and the generation cycle of the random numbers is based on the result: at least the size of the first data frame, and the data amount of the two tracks on the outermost circumference divided by the second The result of multiplying the results obtained by the sizes of the two data frames, wherein the second data frame=n×the first data frame, and n is an integer. The advantage of this scrambler is that it produces a stable servo signal and suppresses the DC component in the modulation in a high-density disk system.

Description

technical field [0001] The present invention relates to data scrambling, and in particular to a scrambler and a scrambling method suitable for high-density optical disc systems. Background technique [0002] In general, the goal of data scrambling is to protect data from users who do not have the key. For telecommunication, data scrambling is a widely used random method for the purpose of secure communication. [0003] An optical disc system utilizing an optical disc, such as a compact disc read only memory (CD-ROM) or a digital versatile disc (DVD), employs a random number generator that randomizes data input to a scrambler. [0004] The first reason for scrambling input data in an optical disc system is to smoothly perform tracking control with differential phase detection (DPD). If equivalent data is input and the same modulation codes of the equivalent data are recorded in adjacent tracks on the optical disc, the DPD signal cannot be detected during reproduction, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/85G11B20/10G11B20/12G11B20/14G11B20/18H04K1/00H04K1/04H04L9/20H04N5/913H04N7/167H04N21/2347H04N21/426
CPCG11B20/10G11B20/1833G11B2220/2579H04N5/913H04N7/1675H04N21/2347H04N21/42646H04N2005/91364G11B20/12
Inventor 沈载晟
Owner SAMSUNG ELECTRONICS CO LTD
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