Random data generator and scrambler using said generator

Abstract

The invention relates to a random number generator and a scrambler utilizing the random number generator and consist of a m * n ROM form; all the serial registers used for shifting and storing n bit(s); a selective output circuit, which receives the n bit(s) as the selective signals from the m * n ROM form, provides zero relative to the significant bit(s) of the n bit(s) output from the m * n ROM form and provides the output of the registers relative to the insignificant bit(s); and a logic circuit, which executes the XOR operation relative to the n bit(s) output by the selective output circuit and the n bit(s) output by the registers and feeds the outcome of the XOR operation back to the least significant register only under the condition of the significant bit(s) of the n bit(s) output from the m * n ROM form.

Description

[0001] This patent application is a divisional application of the following patent application: [0002] Application number: 00120451.3 [0003] Application date: July 10, 2000 [0004] Applicant: Samsung Electronics Co., Ltd. [0005] Title of Invention: Random Data Generator and Scrambler Using the Generator technical field [0006] The invention relates to the field of data randomization, more specifically, to a random data generator suitable for a high-density optical disc system and a scrambler using the random data generator. Background technique [0007] Random data generators that transform specific input value data into a random number are being used in scramblers for optical disc systems using optical discs such as compact disc read only memory (CD-ROM) or digital versatile disc (DVD). [0008] Typically, data scrambling is used to secure data without a user key, and is a type of randomization that is being widely used for secure communications. [0009] The fi...

AI Technical Summary

Problems solved by technology

If the same data is received and thus the same modulated code is recorded on the adjacent recording point of the disc, so that the detection of the DPD signal is not performed when reproducing, it will make the servo system unable to perform tracking control

For example, in the case of an unscrambled audio CD, the control of DPD is difficult between the tuned (i.e., sectors where each data is "00h") sectors

[0010] The second reason is to reduce the burden of DC rejection control performed by the modulator

[0011] The third reason is to protect specific data

[0018] However, conventional random data generators and scramblers utilizing them cannot solve the problem of generating and scrambling random data requiring periods greater than 32K

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