|
|
US 5,696,505 C1 (7103rd) |
|
| METHOD OF CONVERTING A SERIES OF M-BIT INFORMATION WORDS TO A MODULATED SIGNAL, METHOD OF PRODUCING A RECORD CARRIER, CODING DEVICE, DECODING DEVICE, RECORDING DEVICE, READING DEVICE, SIGNAL, AS WELL AS A RECORD CARRIER |
| Kornelis A. Schouhamer Immink, Eindhoven, Netherlands, assignor to U.S. Philips Corporation, New York, N.Y. |
| Reexamination Request No. 90/006,637, May 14, 2003. |
| Reexamination Certificate for Patent 5,696,505, issued Dec. 9, 1997, Appl. No. 385,533, Feb. 8, 1995. |
| Claims priority, application European Pat. Off., Feb. 15, 1994, 94200387 |
| Int. Cl. H03M 5/00;5/14; G11B 20/14; H04L 7/04 (2006.01) |
| AS A RESULT OF REEXAMINATION, IT HAS BEEN DETERMINED THAT: |
| The patentability of claims 2-4, 8, 9, and 11 is confirmed. |
| Claims 1, 12, 20, and 25-38 are cancelled. |
| Claims 5, 6, 10, 13, 16, and 23 are determined to be patentable as amended. |
| Claims 7, 14, 15, 17-19, 21, 22, and 24, dependent on an amended claim, are determined to be patentable. |
| New claims 39-50 are added and determined to be patentable. |
|
| 2. A method of converting a series of m-bit information words to a modulated signal, with m being an integer, in which method an n-bit code word is delivered for each received information word, with n being an integer exceeding m, and the delivered code words are converted to the modulated signal, and in which the series of information words is converted to a series of code words according to rules of conversion so that the corresponding modulated signal satisfies a predetermined criterion, wherein the code words are divided among at least one group of a first type and at least one group of a second type, where the delivery of each of the code words belonging to a group of the first type establishes a first type of coding state determined by the group to which that code word belongs, and the delivery of each of the code words belonging to a group of the second type establishes a second type of coding state determined by the group to which that code word belongs and the information word for which that code word is delivered, and when one of the code words is assigned to a received information word, that code word is selected from a set of code words that depends on the coding state of the first type or the second type established when a preceding code word was delivered, where sets of code words belonging to coding states of the second type do not contain any code words in common, wherein the series of information words is converted to the series of code words according to the rules of conversion so that the corresponding modulated signal presents substantially no frequency components in a low-frequency area in the frequency spectrum and each number of successive bit cells having a same signal value in the modulated signal is at least d+1 and at most k+1, and the sets of code words for each of at least a number of information words comprises at least a pair of code words, with low-frequency components in the modulated signal being avoided when the information words are converted by selected code words from the pairs of code words.
|
