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EP0155529A2
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Method of magnetically recording video signals and an apparatus therefor
Assignee: Hitachi Ltd
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Filing: 1985-02-22
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Granted: —
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Expires: 2005-02-22
Abstract
Abstract An improved 8-8 mapping table system in digitally and magnetically recording video signals. Video signals coded into natural binary codes consisting of 8 bits are converted into different binary codes consisting of 8 bits constituted by patterns in which a continuous number of the 1's or the 0's does not exceed a predetermined number. In these codes, the continuous number of the 1's or the 0's is so limited that a maximum magnetization interval is reduced in magnetically recording the signals. Therefore, erroneous code is prevented from occurring in reproducing the signals.
Inventors
- 👤 Masuo Umemoto
- 👤 Seiichi Mita
- 👤 Morishi Izumita
- 👤 Yuuichi Michikawa
- 👤 Morito Rokuda
- 👤 Hitoshi Katayama
- 👤 Hidehiro Kanada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 22:46
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; H04N9/00; H04N9/79; H04N9/80; H04N9/804
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
185 words
A method of magnetically recording video signals, comprising: a step for coding an analog video signal using a first binary code; a step for converting the signal coded by said first binary code into a second binary code having a pattern which satisfies when or which satisfies when where, n denotes a maximum continuous number of max the same digits that develop when code patterns of two given samples are continuing, n s denotes a number of digits as counted from the first digit until a digit different from the first digit of the code pattern appears, n denotes a number of digits as counted from the last digit until a digit different from the last digit of the code pattern appears, n m denotes a continuous number of the same digits that exist in a portion between the first digit and the last digit of the code pattern, and k denotes a positive integer; and a step for recording the signal that has been converted into the second binary code onto a magnetic recording medium after having inverted the code of every other sample.
Claim 2
Independent Claim
185 words
A method of magnetically recording video signals, comprising: a step for coding an analog video signal using a first binary code; a step for converting the signal coded by said first binary code into a second binary code having a pattern which satisfies when or which satisfies when where, n denotes a maximum continuous number of max the same digits that develop when code patterns of two given samples are continuing, n s denotes a number of digits as counted from the first digit until a digit different from the first digit of the code pattern appears, n denotes a number of digits as counted from the last digit until a digit different from the last digit of the code pattern appears, n m denotes a continuous number of the same digits that exist in a portion between the first digit and the last digit of the code pattern, and k denotes a positive integer; and a step for recording the signal that has been converted into the second binary code onto a magnetic recording medium after having inverted the code of every other sample.
Claim 3
Independent Claim
218 words
A method of magnetically recording video signals, comprising: a step for preparing a code conversion table in which a first binary code is correspond to a second binary code having a pattern that satisfies when or which satisfies when where, n max denotes a maximum continuous number of the same digits that develop when code patterns of two given samples are conti- nuting, n s denotes a number of digits as counted from the first digit until a digit different from the first digit of the code pattern appears, n r denotes a number of digits as counted from the last digit until a digit different from the last digit of the code pattern appears, n m denotes a continuous number of the same digits that exist in a portion between the färst digit and the last digit of the code pattern, and k denotes a positive integer; a step for coding a video signal that is to be recorded using the first binary code; a step for converting the signal coded by the first binary code into a second binary code relying upon the code conversion table; and a step for recording the signal that has been converted into the second binary code onto a magnetic recording medium after having inverted the code of every other sample.
Claim 4
Independent Claim
218 words
A method of magnetically recording video signals, comprising: a step for preparing a code conversion table in which a first binary code is correspond to a second binary code having a pattern that satisfies when or which satisfies when where, n max denotes a maximum continuous number of the same digits that develop when code patterns of two given samples are conti- nuting, n s denotes a number of digits as counted from the first digit until a digit different from the first digit of the code pattern appears, n r denotes a number of digits as counted from the last digit until a digit different from the last digit of the code pattern appears, n m denotes a continuous number of the same digits that exist in a portion between the färst digit and the last digit of the code pattern, and k denotes a positive integer; a step for coding a video signal that is to be recorded using the first binary code; a step for converting the signal coded by the first binary code into a second binary code relying upon the code conversion table; and a step for recording the signal that has been converted into the second binary code onto a magnetic recording medium after having inverted the code of every other sample.
Claim 5
Dependent Claim
41 words
A method of magnetically recording video signals according to claim 1 or 2, wherein said second binary code has a pattern consisting of eight bits, that satisfies n max = 6, n m ≦6, n s ≦3 and n r ≦3.
Claim 6
Dependent Claim
42 words
A method of magnetically recording video signals according to claim 1 or 2, wherein said second binary code has a pattern consisting of eight bits, that satisfies n max = 7, n m ≦6, and n s ≦4, n r ≦3, or
Claim 7
Dependent Claim
40 words
A method of magnetically recording video signals according to claim 1 or 2, wherein said second binary code has a pattern consisting of eight bits, that satisfies n max = 8, n m ≦6, n s ≦4, n r ≦4.
Claim 8
Dependent Claim
44 words
A method of magnetically recording video signals according to claim 1 or 2, wherein said second binary code consists of: a code having a pattern consisting of eight bits, that satisfies and a code having a pattern consisting of eight bits, that satisfies or
Claim 9
Dependent Claim
58 words
A method of magnetically recording video signals according to claim 6, wherein said code having a pattern consisting of eight bits, that satisfies or is comprised of three patterns in which the number of the l's is six in eight bits, and a pattern in which the number of the 1's is seven or five in eight bits.
Claim 10
Dependent Claim
56 words
A method of magnetically recording video signals according to claim 1 or 2, wherein said analog video signal consists of a luminance signal and at least one kind of chrominance signal, said luminance signal and said chrominance signal are converted into said first binary codes, respectively, and are then converted into said second binary codes, respectively.
Claim 11
Dependent Claim
56 words
A method of magnetically recording video signals according to claim 8, wherein the luminance signal converted into the first binary code is then converted into a second binary code which consists of: a code having a pattern consisting of eight bits, that satisfies and a code having a pattern consisting of eight bits, that satisfies or
Claim 12
Dependent Claim
58 words
A method of magnetically recording video signals according to claim 9, wherein said code having a pattern consisting of eight bits, that satisfies or is comprised of three patterns in which the number of the l's is six in eight bits, and a pattern in which the number of the 1's is seven or five in eight bits.
Claim 13
Dependent Claim
40 words
11 . A method of magnetically recording video signals according to claim 8, wherein the chrominance signal converted into the first binary code is then converted into a second binary code having a pattern consisting of eight bits, that satisfies
Claim 14
Dependent Claim
243 words
12 . An apparatus for magnetically recording video signals, comprising: an analog-to-digital converter which converts an analog video signal into a digital signal that is coded by a first binary code; means which is equipped with a memory to store a code conversion table in which an output code produced by said analog-to-digital converter is corresponded to a second binary code having a pattern which satisfies when or which satisfies or when where, n denotes a maximum continuous number of max the same digits that develop when code patterns of two given samples are continuing, n s denotes a number of digits as counted from the first digit until a digit different from the first digit of the code pattern appears, n denotes a number of digits as counted from r the last digit until a digit different from the last digit of the code pattern appears, n denotes a continuous number of the same m digits that exist in a portion between the first digit and the last digit of the code pattern, and k denotes a positive integer; and which converts the output signal produced by the analog-to-digital converter into said second binary code based upon said conversion table; means for inverting the code of the signals of said second binary code on every other ; sample; and means for recording onto a magnetic recording medium the signals of said second binary code which has been inverted on every other sample.
Claim 15
Dependent Claim
243 words
12 . An apparatus for magnetically recording video signals, comprising: an analog-to-digital converter which converts an analog video signal into a digital signal that is coded by a first binary code; means which is equipped with a memory to store a code conversion table in which an output code produced by said analog-to-digital converter is corresponded to a second binary code having a pattern which satisfies when or which satisfies or when where, n denotes a maximum continuous number of max the same digits that develop when code patterns of two given samples are continuing, n s denotes a number of digits as counted from the first digit until a digit different from the first digit of the code pattern appears, n denotes a number of digits as counted from r the last digit until a digit different from the last digit of the code pattern appears, n denotes a continuous number of the same m digits that exist in a portion between the first digit and the last digit of the code pattern, and k denotes a positive integer; and which converts the output signal produced by the analog-to-digital converter into said second binary code based upon said conversion table; means for inverting the code of the signals of said second binary code on every other ; sample; and means for recording onto a magnetic recording medium the signals of said second binary code which has been inverted on every other sample.
Claim 16
Dependent Claim
39 words
An apparatus for magnetically recording video signals according to claim 12, wherein said second binary code has a pattern consisting of eight bits, that satisfies n max = 6, n m ≦6, n s ≦3 and n r ≦3.
Claim 17
Dependent Claim
49 words
An apparatus for magnetically recording video signals according to claim 1 . 2 , wherein said second binary code has a pattern consisting of eight bits, that satisfies n max = 7, n m ≦6, and n s ≦4, n r ≦3, or n s ≦3, n r ≦4.
Claim 18
Dependent Claim
39 words
An apparatus for magnetically recording video signals according to claim 12, wherein said second binary code has a pattern consisting of eight bits, that satisfies n max = 8, n m ≦6, n s 54, n r S4 .
Claim 19
Dependent Claim
42 words
An apparatus for magnetically recording video signals according to claim 12, wherein said second binary code consists of: a code having a pattern consisting of eight bits, that satisfies and a code having a pattern consisting of eight bits, that satisfies or
Claim 20
Dependent Claim
60 words
An apparatus for magnetically recording video signals according to claim 1 6 , wherein said code having a pattern consisting of eight bits, that satisfies or is comprised of three patterns in which the number of the 1's is six in eight bits, and a pattern in which the number of the 1's is seven or five in eight bits.
Claim 21
Dependent Claim
53 words
An apparatus for magnetically recording video signals according to claim 12, wherein said analog video signal consists of a luminance signa1.and at least one kind of chrominance signal, said luminance signal and said chrominance signal are converted into said first binary codes, respectively, and are then converted into said second binary codes, respectively.
Claim 22
Dependent Claim
47 words
An apparatus for magnetically recording video signals according to claim 18, wherein provision is made of means for processing a plurality of video signals that represent a plurality of different colors of subjects, in order to obtain luminance signals and chrominance signals of at least one kind.
Claim 23
Dependent Claim
56 words
An apparatus for magnetically recording video signals according to claim 13, wherein the luminance signal converted into the first binary code is then converted into a second binary code which consists of: a code having a pattern consisting of eight bits, that satisfies and a code having a pattern consisting of eight bits, that satisfies or
Claim 24
Dependent Claim
58 words
An apparatus for magnetically recording video signals according to claim 20, wherein said code having a pattern consisting of eight bits, that satisfies or is comprised of three patterns in which the number of the l's is six in eight bits, and a pattern in which the number of the 1's is seven or five in eight bits.
Claim 25
Dependent Claim
38 words
An apparatus for magnetically recording video signals according to claim 8, wherein the chrominance signal converted into the first binary code is then converted into a second binary code having a pattern consisting of eight bits, that satisfies
Claim 26
Independent Claim
379 words
An apparatus for magnetically recording video signals, comprising: a first analog-to-digital converter which converts a luminance signal into a digital signal; a second analog-to-digital converter which converts a chrominance signal into a digital signal; a first conversion means which is equipped with a first memory that stores a first code conversion table in which a code produced by said first analog-to-digital converter is corresponded to a different first code which consists of a code having a pattern consisting of eight bits satisfying where, n denotes a maximum continuous number of max the same digits that develop when code patterns of two given samples are continuing, n denotes a number of digits as counted from the first digit until a digit different from the first digit of the code pattern appears, n r denotes a number of digits as counted from the last digit until a digit different from the last digit of the code pattern appears, n denotes a continuous number of the same m digits that exist in a portion between the first digit and the last digit of the code pattern, i and a code having a pattern consisting of eight bits satisfying or and which converts the signal produced by said first analog-to-digital converter into a signal of said different first code; a second conversion means which is equipped with a second memory that stores a second code conversion table in which a code produced by said second analog-to-digital converter is corresponded to a different second code having a pattern consisting of eight bits satisfying and which converts the signal produced by said second analog-to-digital converter into a signal of said different second code; a first inverter means which inverts the code of signals of said different first code obtained by said first conversion means on every other sample; a second inverter means which inverts the code of signals of said different second code obtained by said second conversion means on every other sample; a first recording means which recordes onto a magnetic recording medium the signals of said different first code which has been inverted on every other sample; and a second recording means which records onto magnetic recording medium the signals of said different second code which has been inverted on every other sample.
Claim 27
Independent Claim
379 words
An apparatus for magnetically recording video signals, comprising: a first analog-to-digital converter which converts a luminance signal into a digital signal; a second analog-to-digital converter which converts a chrominance signal into a digital signal; a first conversion means which is equipped with a first memory that stores a first code conversion table in which a code produced by said first analog-to-digital converter is corresponded to a different first code which consists of a code having a pattern consisting of eight bits satisfying where, n denotes a maximum continuous number of max the same digits that develop when code patterns of two given samples are continuing, n denotes a number of digits as counted from the first digit until a digit different from the first digit of the code pattern appears, n r denotes a number of digits as counted from the last digit until a digit different from the last digit of the code pattern appears, n denotes a continuous number of the same m digits that exist in a portion between the first digit and the last digit of the code pattern, i and a code having a pattern consisting of eight bits satisfying or and which converts the signal produced by said first analog-to-digital converter into a signal of said different first code; a second conversion means which is equipped with a second memory that stores a second code conversion table in which a code produced by said second analog-to-digital converter is corresponded to a different second code having a pattern consisting of eight bits satisfying and which converts the signal produced by said second analog-to-digital converter into a signal of said different second code; a first inverter means which inverts the code of signals of said different first code obtained by said first conversion means on every other sample; a second inverter means which inverts the code of signals of said different second code obtained by said second conversion means on every other sample; a first recording means which recordes onto a magnetic recording medium the signals of said different first code which has been inverted on every other sample; and a second recording means which records onto magnetic recording medium the signals of said different second code which has been inverted on every other sample.
Claim 28
Dependent Claim
58 words
An apparatus for magnetically recording video signals according to claim 23, wherein said code having a pattern consisting of eight bits, that satisfies or is comprised of three patterns in which the number of the 1's is six in eight bits, and a pattern in which the number of the 1's is seven or five in eight bits.
Claim 29
Dependent Claim
44 words
An apparatus for magnetically recording video signals according to claim 23, further comprising means for processing a plurality of video signals that represent a plurality of different colors of subjects, in order to obtain luminance signals and chrominance signals of at least one kind.
References Cited (Backward Citations)
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