Device for encoding n-bit source words into corresponding m-bit channel words and decoding m-bit channel words into corresponding n-bit source words

• US 6,664,905 B1
• Filed: 01/22/2003
• Issued: 12/16/2003
• Est. Priority Date: 12/21/1998
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Coene, Willem M. J.
• Primary Examiner(s): WAMSLEY, PATRICK G
• Application Number:
  US10/349,237
• Time in Patent Office: 328 Days
• Field of Search: 341/102, 341/58, 341/95, 341/59, 341/107
• 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

A device is disclosed for encoding a stream of databits of a binary source signal (S) into a stream of databits of a binary channel signal (C), wherein the stream of databits of the source signal is divided into n-bit source words (x₁, x₂), which device comprises converting means (CM) conceived to convert said n-bit source words into corresponding m-bit channel words (y₁, y₂, y₃) in accordance with a conversion of the Jacoby type, where m and n are integers, with m>n. The device further comprises control means (10) for carrying out DC-control on said binary channel signal by introducing a freedom of choice in the source-to-channel conversion. Furthermore, a decoding device is disclosed for decoding the channel signal obtained by means of the encoding device.

Claims

1. An encoding device comprising:

converting means for converting n-bit source words into corresponding respective m-bit channel words in accordance with a conversion of the Jacoby type, where m and n are integers and m>

n, each bit having a binary value;

means for formatting the m-bit channel words into a channel signal of consecutive channel words; and

control means for carrying out DC-control on the channel signal by influencing a choice made in the binary value of a single bit position in each of multiple channel words during the conversion, the bit position being the same bit position in each of the multiple channel words.

2. The encoding device of claim 1, wherein the converting means convert a block of p consecutive n-bit source words into a block of p consecutive m-bit channel words, and at least one of the bits in the blocks of p consecutive M-bit channel words are selected from ‘

0’ and

‘

1’

under the influence of the control means, p being an integer which is larger than 1.

3. The encoding device of claim 2, wherein, for p=3, n=2, m=3, the converting means convert predetermined blocks of three consecutive 2-bit source words into blocks of three consecutive 3-bit channel words in accordance with the following table:

4. The encoding device of claim 2, wherein, for p=3, n=2, m=3, the converting means convert predetermined blocks of three consecutive 2-bit source words into blocks of three consecutive 3-bit channel words in accordance with the following table:

5. The encoding device of claim 2, wherein, for p=4, n=2, m=3, the converting means convert predetermined blocks of four consecutive 2-bit source words into blocks of four consecutive 3-bit channel words in accordance with the following table:

6. The encoding device of claim 2, wherein, for p=4, n=2, m=3, the converting means convert predetermined blocks of four consecutive 2-bit source words into blocks of four consecutive 3-bit channel words in accordance with the following table:

7. The encoding device of claim 2, wherein, for p=4, n=2, m=3, the converting means convert predetermined blocks of four consecutive 2-bit source words into blocks of four consecutive 3-bit channel words in accordance with the following table:

8. The encoding device of claim 1, further comprising:

means for receiving an input stream of databits of a binary source signal and dividing the stream into consecutive n-bit source words; and

means for formatting the m-bit channel words into an output stream of databits and transmitting the output stream onto a media.

9. The encoding device of claim 1, wherein the encoding device further comprises means for adding merging bits between the consecutive code words for carrying out additional DC-control.

10. The encoding device of claim 1, wherein n=2 and m=3.

11. The encoding device of claim 1 wherein the choice is made so as to limit a property of a running digital sum (RDS) of the binary channel signal.

12. A encoding device comprising:

converting means for converting n-bit source words into corresponding m-bit channel words in such a way that the m-bit channel words lack successive bits having a binary value that results in signal transitions; and

control means for carrying out stochastic DC-control on the binary channel signal by influencing a choice made in the binary value of a single bit position in each of multiple channel words during the conversion, the bit position being the same bit position in each of the multiple channel words.

13. The encoding device of claim 12, wherein the device further comprises preceding means for converting the channel words into a precoded channel signal, and recording means for recording the precoded channel signal onto a record carrier.

14. The encoding device of claim 13, wherein the record carrier is an optical record carrier.

15. The encoding device of claim 12, wherein n=2 and m=3, and the conversion of the Jacoby type comprises converting 2-bit source words into 3-bit channel words in according with the following table:

16. The encoding device of claim 12, wherein the device further comprises bit-adding means for adding merging bits between code words for carrying out additional DC-control.

17. A method comprising:

converting n-bit source words into corresponding m-bit channel words in accordance with a conversion of the Jacoby type, where m and n are integers and m>

n, the bits having a binary value; and

providing DC-control of the binary channel signal influencing a choice made in the binary value of a single bit position in each of multiple channel words during the conversion, the bit position being the same bit position in each of the multiple channel words.

18. The method of claim 17, wherein the method further comprises the step of converting the channel words into a precoded channel signal, and the step of recording the precoded channel signal onto a record carrier.

19. The method of claim 18, wherein the record carrier is an optical record carrier.

20. The method of claim 17 further comprising;

receiving a binary input stream of databits of a source signal and dividing the stream into n-bit source words; and

formatting the m-bit channel words into a binary output stream of databits of a channel signal and transmitting the output stream onto a media.

21. The method of claim 17, wherein a block of p consecutive n-bit source words is converted into a block of p consecutive m-bit channel words, one of the bits in the blocks of p consecutive m-bit channel words being chosen under the influence of the DC-control, p being an integer which is larger than 1.

22. The method of claim 17, wherein the method further comprises adding merging bits between the consecutive code words for carrying out additional DC-control.

23. A channel signal produced by the method of claim 17.

24. The method of claim 17, wherein the choice is made so as to limit a property of a running digital sum (RDS) of the binary channel signal.

25. A channel signal comprising m-bit channel words corresponding to respective n-bit source words in accordance with a conversion of the Jacoby type, where m and n are integers and m>

n, wherein, in the binary channel signal, a pair of blocks of p consecutive m-bit channel words, being converted from an identical pair of blocks of p consecutive n-bit source words, is present, the blocks of the pair of m-bit channel words differing from each other in the bit value at one bit position only in the blocks, p being an integer which is larger than 1.

26. The channel signal of claim 25, wherein the signal comprises merging bits between the consecutive code words for carrying out additional DC-control.

27. A record carrier comprising the channel signal of claim 25.

28. A record carrier comprising a substrate and a recording layer containing a channel signal having m-bit channel words each corresponding to a respective n-bit source word in accordance with a conversion of the Jacoby type, where m and n are integers and m>

n, wherein a pair of blocks of p consecutive m-bit channel words are converted from identical blocks of p consecutive n-bit source words, the blocks of m-bit channel words differing from each other in the bit value at one bit position only in the blocks, p being an integer which is larger than 1.

29. A decoding device comprising:

means for receiving an input stream of databits of a channel signal and dividing the stream into consecutive m-bit channel words;

deconverting means for deconverting the m-bit channel words into corresponding n-bit source words in accordance with a deconversion of the Jacoby type, where m and n are integers and m>

n, wherein pairs of blocks of p consecutive m-bit channel words are deconverted into identical blocks of p consecutive n-bit source words, the pairs of blocks of p consecutive m-bit channel words differing from each other in the bit value at one bit position only in the, blocks, p being an integer which is larger than 1.

30. The decoding device of claim 29 comprising means for formatting the consecutive n-bit source words into an output stream of databits of a binary source signal, and transmitting the output stream.

31. The decoding device of claim 29 wherein the input stream of databits includes merging bits between the code words and the receiving means discards merging bits.

32. A decoding device of claim 29, wherein the decoding is carried out in accordance with the following table:

33. A decoding device of claim 29, wherein the decoding is carried out in accordance with the following table:

34. A recorder comprising:

means for receiving an input stream of databits of a source signal and dividing the stream into consecutive n-bit source words; and

converting means for converting n-bit source words into corresponding respective m-bit channel words in accordance with a conversion of the Jacoby type, where m and n are integers and m>

n, the bits having a binary value;

means for formatting the m-bit channel words into a channel signal of consecutive channel words;

control means for carrying out DC-control on the channel signal influencing a choice made in the bit value of a single bit position in each of multiple channel words during the conversion, the bit position being the same bit position in each of the multiple channel words; and

recording means for recording the channel signal onto a record carrier.

35. A player comprising:

means for reading a DC controlled channel signal from an information carrier;

means for dividing the channel signal into consecutive m-bit channel words;

deconverting means for deconverting the m-bit channel words into corresponding respective n-bit source words in accordance with a deconversion of the Jacoby type, where m and n are integers and m>

n, wherein pairs of blocks of p consecutive m-bit channel words are deconverted into identical blocks of p consecutive n-bit source words, the pairs of blocks of p consecutive m-bit channel words differing from each other in the bit value at one bit position only in the blocks, p being an integer which is larger than 1.

36. A decoding device comprising:

means for receiving a DC controlled input stream of databits of a channel signal and dividing the stream into consecutive m-bit channel words; and

deconverting means for deconverting the m-bit channel words into corresponding n-bit source words in accordance with a deconversion of the Jacoby type, where m and n are integers and m>

n, and the bits have a binary value, and wherein the deconverting depends on a choice made in the bit value of a single bit position in each of multiple channel words during a previous converting of the n-bit source words into the m-bit channel words during the converting, the bit position being a single bit position in each of the multiple channel words, the bit position being the same bit position in each of the multiple channel words.

37. A player comprising:

means for reading a DC controlled channel signal from an information carrier;

means for dividing the channel signal into consecutive m-bit channel words; and

deconverting means for deconverting the m-bit channel words into corresponding n-bit source words in accordance with a deconversion of the Jacoby type, where m and n are integers and m>

n, wherein the -deconverting depends on a choice made in the bit value of one respective bit position of each channel word for which a choice is made during a previous converting of the n-bit source words into the m-bit channel words during the converting.

38. An encoding device comprising:

converting means for converting n-bit source words into corresponding respective m-bit channel words in accordance with a conversion of the Jacoby type, where m=3 and n=2 and each bit has a binary value;

means for formatting the m-bit channel words into a channel signal of consecutive channel words; and

control means for carrying out DC-control on the channel signal influencing a choice made in the conversion of source words to channel words during the converting.

39. A recorder comprising:

means for receiving an input stream of databits of a source signal and dividing the stream into consecutive n-bit source words; and

converting means for converting n-bit source words into corresponding respective m-bit channel words in accordance with a conversion of the Jacoby type, where m=3 and n=2;

means for formatting the m-bit channel words into a channel signal of consecutive channel words;

control means for carrying out DC-control on the channel signal influencing a choice made in the conversion of source words to channel words during the converting; and

recording means for recording the channel signal onto a record carrier.

40. A method comprising:

converting n-bit source words into corresponding m-bit channel words in accordance with a conversion of the Jacoby type, where m=2 and n=2; and

providing DC-control of the binary channel signal influencing a choice made in the conversion of source words to channel words during the converting.

41. A channel signal produced by the method of claim 40.

42. A record carrier comprising the channel signal of claim 41.

43. A decoding device comprising:

means for receiving a DC controlled input stream of databits of a channel signal and dividing the stream into consecutive m-bit channel words; and

deconverting means for deconverting the m-bit channel words into corresponding n-bit source words in accordance with a deconversion of the Jacoby type, where m=3 and n=2, wherein the deconverting depends on a choice made in a previous converting of the n-bit source words into the m-bit channel words during the converting.

44. A player comprising:

means for reading a DC controlled channel signal from an information carrier;

means for dividing the channel signal into consecutive m-bit channel words; and

deconverting means for deconverting the m-bit channel words into corresponding n-bit source words in accordance with a deconversion of the Jacoby type, where m=3 and n=2, wherein the deconverting depends on a choice made in a previous converting of the n-bit source words into the m-bit channel words during the converting.