US4531153A
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Method and apparatus for encoding and decoding a binary digital information signal
Assignee: Sony Corp
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Filing: 1982-10-29
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Granted: 1985-07-23
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Expires: 2002-10-29
Abstract
Abstract A system of encoding an original binary digital video signal comprised of a plurality of first 8-bit words having an absolute value and a digital sum variation, to produce an encoded binary digital video signal, converts each first 8-bit word into a second 8-bit word also having an absolute value and a digital sum variation such that, with respect to predetermined groups of correlative first 8-bit words, that is, first 8-bit words having absolute values which are close to each other, second 8-bit words corresponding to the first 8-bit words in each respective group have the same digital sum variation; and then inverts every alternate m second 8-bit words, where m=1, 2, 3 . . . , to form the encoded binary digital video signal with substantially reduced DC content while maintaining the same recording bit rate.
Inventors
- 👤 Kenji Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:17
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4906; G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926; G11B2020/1434; G11B2020/1438
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
142 words
A method for use with a binary digital signal provided at a source bit rate and formed of a plurality of first n-bit words that correlate in value such that successive words have values close to each other and which have a digital sum variation to produce an encoded binary digital signal having a reduced digital sum variation without increasing the source bit rate, comprising the steps of: arranging second n-bit words into groups classified by the digital sum variation values thereof, so that the second n-bit words in each group have substantially the same digital sum variation values; substituting said groups of second n-bit words for groups of corresponding first n-bit words having the same number of words and being arranged in sequential order; and inverting every m th one of said second n-bit words, where m=2, 3, . . .
Claim 2
Independent Claim
142 words
A method for use with a binary digital signal provided at a source bit rate and formed of a plurality of first n-bit words that correlate in value such that successive words have values close to each other and which have a digital sum variation to produce an encoded binary digital signal having a reduced digital sum variation without increasing the source bit rate, comprising the steps of: arranging second n-bit words into groups classified by the digital sum variation values thereof, so that the second n-bit words in each group have substantially the same digital sum variation values; substituting said groups of second n-bit words for groups of corresponding first n-bit words having the same number of words and being arranged in sequential order; and inverting every m th one of said second n-bit words, where m=2, 3, . . .
Claim 3
Dependent Claim
9 words
A method according to claim 1; in which n=8.
Claim 4
Dependent Claim
25 words
A method according to claim 1; in which each of said predetermined groups includes a plurality of first n-bit words having successively increasing integer values.
Claim 5
Dependent Claim
44 words
A method according to claim 1; in which at least one first n-bit word not included in any of said predetermined groups is converted into at least one corresponding second n-bit word which is identical to the respective at least one first n-bit word.
Claim 6
Dependent Claim
24 words
A method according to claim 1, further comprising the step of arranging said first n-bit words in said groups in succesively decreasing numerical order.
Claim 7
Dependent Claim
34 words
A method according to claim 1; in which said binary digital signal is a digitized video signal comprised of a plurality of horizontal lines, each horizontal line being formed of g first n-bit words.
Claim 8
Dependent Claim
29 words
A method according to claim 6, including the further step of inverting ever r th one of said plurality of horizontal lines, where r=2, 3, . . . .
Claim 9
Independent Claim
162 words
A method of decoding an encoded binary digital signal comprised of a plurality of n-bit words formed by converting each of a plurality of first n-bit words having a digital sum variation into a respective second n-bit word having a digital sum variation such that, with respect to predetermined groups of correlative first n-bit words in which successive first n-bit words have values close to each other, said second n-bit words corresponding to said first n-bit words in each respectively group have the same digital sum variation, and inverting every m th one of said second n-bit words, where m=2, 3 . . ., comprising the steps of: inverting every m th one of said n-bit words of said encoded binary digital signal to form a non-inverted encoded binary digital signal comprised of said second n-bit words; and converting each of said second n-bit words back to the respective one of said first n-bit words to form an original binary digital signal.
Claim 10
Independent Claim
162 words
A method of decoding an encoded binary digital signal comprised of a plurality of n-bit words formed by converting each of a plurality of first n-bit words having a digital sum variation into a respective second n-bit word having a digital sum variation such that, with respect to predetermined groups of correlative first n-bit words in which successive first n-bit words have values close to each other, said second n-bit words corresponding to said first n-bit words in each respectively group have the same digital sum variation, and inverting every m th one of said second n-bit words, where m=2, 3 . . ., comprising the steps of: inverting every m th one of said n-bit words of said encoded binary digital signal to form a non-inverted encoded binary digital signal comprised of said second n-bit words; and converting each of said second n-bit words back to the respective one of said first n-bit words to form an original binary digital signal.
Claim 11
Dependent Claim
123 words
Apparatus for encoding a binary digital signal provided at a source bit rate and formed of a plurality of first n-bit words having a digital sum variation to produce an encoded binary digital signal having a reduced digital sum variation at said source bit rate, comprising: means for converting each first n-bit word into a second n-bit word having a digital sum variation such that, with respect to predetermined groups of correlative first n-bit words in which successive words have values close to each other, said means for converting including means for arranging said second n-bit words in groups having the same digital sum variation; and means for inverting every m th one of said n-bit words, where m=2, 3 . . .
Claim 12
Dependent Claim
123 words
Apparatus for encoding a binary digital signal provided at a source bit rate and formed of a plurality of first n-bit words having a digital sum variation to produce an encoded binary digital signal having a reduced digital sum variation at said source bit rate, comprising: means for converting each first n-bit word into a second n-bit word having a digital sum variation such that, with respect to predetermined groups of correlative first n-bit words in which successive words have values close to each other, said means for converting including means for arranging said second n-bit words in groups having the same digital sum variation; and means for inverting every m th one of said n-bit words, where m=2, 3 . . .
Claim 13
Dependent Claim
33 words
Apparatus according to claim 9; in which said binary digital signal is a digitized video signal comprised of a plurality of horizontal lines, each horizontal line being formed of q first n-bit words.
Claim 14
Dependent Claim
8 words
Apparatus according to claim 9; in which n=8.
Claim 15
Dependent Claim
162 words
Apparatus for decoding an encoded binary digital signal comprised of a plurality of n-bit words formed by converting each of plurality of first n-bit words having a digital sum variation into a respective second n-bit word having a digital sum variation such that, with respect to predetermined groups of correlative first n-bit words in which successive first n-bit words have values close to each other, said second n-bit words corresponding to said first n-bit words in each respective group have the same digital sum variation, and inverting every m th one of said second n-bit words, where m=2, 3 . . . , comprising: means for inverting every m th one of said n-bit words of said encoded binary digital signal to form a non-inverted encoded binary digital signal comprised of said second n-bit words; and means for converting each of said second n-bit words back to the respective one of said first n-bit words to form an original binary digital signal.
Claim 16
Dependent Claim
162 words
Apparatus for decoding an encoded binary digital signal comprised of a plurality of n-bit words formed by converting each of plurality of first n-bit words having a digital sum variation into a respective second n-bit word having a digital sum variation such that, with respect to predetermined groups of correlative first n-bit words in which successive first n-bit words have values close to each other, said second n-bit words corresponding to said first n-bit words in each respective group have the same digital sum variation, and inverting every m th one of said second n-bit words, where m=2, 3 . . . , comprising: means for inverting every m th one of said n-bit words of said encoded binary digital signal to form a non-inverted encoded binary digital signal comprised of said second n-bit words; and means for converting each of said second n-bit words back to the respective one of said first n-bit words to form an original binary digital signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |