Data modulating method and apparatus, data demodulating method and apparatus, and code arranging method

• US 7,164,373 B2
• Filed: 12/12/2005
• Issued: 01/16/2007
• Est. Priority Date: 09/27/2002
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Shim, Jae-seong, Jung, Kiu-hae, kim, Jin-han
• Primary Examiner(s): Nguyen; Linh V.
• Application Number:
  US11/298,827
• Publication Number:
  US 20060092060A1
• Time in Patent Office: 400 Days
• Field of Search: 341/58, 341/59, 341/67, 341/102, 341/103, 369/47.31, 369/59.23, 370/326, 375/140, 375/152, 375/240, 375/253, 380/216, 714/769, 714/795, 360/40
• US Class Current: 341/102
• CPC Class Codes: G11B 20/1426 conversion to or from block codes or representations thereof
• CPC Class Codes: H03M 5/145 Conversion to or from block codes or representations thereof

Abstract

In a data demodulating method and apparatus, and a code arranging method, a multiplexer multiplexes an input data stream divided by a predetermined length into a plurality of types of pseudo random data streams using multiplexed information of predetermined bits by applying a predetermined multiplexing method to each of the pseudo random data streams. An encoder RLL-modulates the plurality of types of pseudo random data streams to create a modulated code stream including a minimum of DC components. The multiplexer generates the random data streams by inconsecutively scrambling the input data stream using the multiplexed information. The encoder weak DC-free RLL-modulates each of the multiplexed data streams without using a DC control sub code conversion table to which additional bits are added and provides a code stream including a minimum of DC components among multiplexed, RLL-modulated code streams.

Claims

1. A data demodulating method comprising:

demodulating each n bit of input digital data into m-bit where n≧

m, and m and n are positive integers, of a demodulation code unit to generate a non-inverted data stream having a predetermined length; and

inconsecutively descrambling the non-inverted data stream using multiplexed information to generate an inverted data stream.

2. The demodulating method of claim 1, wherein the descrambing of the non-inverted data stream comprises:

performing an exclusive OR operation on a first demodulation code unit and initial data that is the multiplexed information to generate first inverted data;

outputting a second demodulation code unit to a q-1th demodulation code unit without performing an exclusive OR operation;

performing an exclusive OR operation on the first demodulation code unit and a first qth demodulation code unit of inconsecutive qth demodulation code units to generate next inverted data; and

repeating an exclusive OR operation to the final one of the remaining qth demodulation code units of the non-inverted data stream to provide the inverted data stream.

3. A computer-readable medium having computer-executable instructions for performing operations of a data demodulating method, the operations comprising:

demodulating each n bit of input digital data into m-bit, where n≧

m and m and n are positive integers, of a demodulation code unit to generate a non-inverted data stream having a predetermined length; and

inconsecutively descrambling the non-inverted data stream using multiplexed information to generate an inverted data stream.

4. A data modulating method, comprising:

modulating source data into code words where a minimum run length is confined to “

d” and

a maximum run length limit is confined to “

k”

, wherein “

d” and

“

k”

are positive integers,

wherein the modulating operation includes changing a code word a into another code word so that a sum of an EndZero of the code word a and a LeadZero of a code word b is greater than or equal to the minimum run length limit and is less than or equal to the maximum run length limit in a case in which the sum of the EndZero of the code word a and the LeadZero of the code word b is less than the minimum run length limit or is greater than the maximum run length limit, wherein the code word b is connected to the code word a, the code word a is a preceding code word, the EndZero is a number of successive zeros from least significant bits (LSBs) of the code word a to most significant bits (MSBs) and the LeadZero is a number of successive zeros from MSBs of the code word b to LSBs.

5. The method of claim 4, wherein the minimum run length limit “

d”

is 1 and the maximum run length “

k”

is 7, the changing comprises changing the code word a into a code word in which the LSB of the code word is “

0”

when the EndZero of the code word a is “

0” and

the LeadZero of the code word b is “

0”

.

6. The method of claim 4, wherein the code words are subsequently demodulated by a method comprising:

demodulating each n bit of input codewords into m-bit where n≧

m, and m and n are positive integers, of a demodulation code unit to generate a non-inverted data stream having a predetermined length; and

inconsecutively descrambling the non-inverted data stream using multiplexed information to generate an inverted data stream.

7. The method of claim 6, wherein the descrambing of the non-inverted data stream comprises:

performing an exclusive OR operation on a first demodulation code unit and initial data that is the multiplexed information to generate first inverted data;

outputting a second demodulation code unit to a q-1th demodulation code unit without performing an exclusive OR operation;

performing an exclusive OR operation on the first demodulation code unit and a first qth demodulation code unit of inconsecutive qth demodulation code units to generate next inverted data; and

repeating an exclusive OR operation to the final one of the remaining qth demodulation code units of the non-inverted data stream to provide the inverted data stream.