EP0348132A2
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Methods of and apparatus for data transmission
Assignee: Sony Corp
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Filing: 1989-06-19
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Granted: —
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Expires: 2009-06-19
Abstract
Abstract A data transmission and reception apparatus and method capable of selecting either of two modes having the same sampling frequency in which the bit numbers of one data unit are either m or n (which are integral numbrs and m > n), while using the same error correction encoder (15) and decoder (29 Figure 2) for the two modes, by inserting (13) m-n bits of dummy data bits into the n-bit data so as to handle it as m-bit data during the processes of error correction encoding (15) and decoding (29) and eliminating from the error correction encoded data the dummy data and redundant code of the error correction code formed by the dummy data only.
Inventors
- 👤 Yoichiro Patents Division Sony Corporation Sako
- 👤 Kentaro Patents Division Sony Corporation Odaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 06:23
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/94; H04N5/945; G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1806; G11B20/1809; H04N9/00; H04N9/79; H04N9/7921; H04N9/7925; H04N9/80; H04N9/802
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
140 words
A data transmission method for error correction encoding data in units of a block composed of a two-dimensional array of digital information signals, the method comprising the steps of: making equal the size of a first block and the size of a second block, whose block sizes are different, by adding dummy data to whichever of the first and second blocks has the lesser amount of data and so that at least a part of a sequence of the error correction code in the smaller block is derived from the dummy data only and so is a redundant code; error correction encoding the one block that has the dummy data and the other block that does not contain dummy data; and eliminating the dummy data, and the redundant code from the error correction encoded blocks and transmitting the resulting data.
Claim 2
Dependent Claim
140 words
A data transmission method for error correction encoding data in units of a block composed of a two-dimensional array of digital information signals, the method comprising the steps of: making equal the size of a first block and the size of a second block, whose block sizes are different, by adding dummy data to whichever of the first and second blocks has the lesser amount of data and so that at least a part of a sequence of the error correction code in the smaller block is derived from the dummy data only and so is a redundant code; error correction encoding the one block that has the dummy data and the other block that does not contain dummy data; and eliminating the dummy data, and the redundant code from the error correction encoded blocks and transmitting the resulting data.
Claim 3
Dependent Claim
180 words
A data transmission method of error correction encoding a data block, which is composed of a two-dimensional array of digital information signals, with a first error correction code (C1) encoding data in the vertical direction of the array, and a second error correction code (C2) encoding data in the horizontal direction of the array, the method comprising the steps of: making equal the size of a first block and the size of a second block, whose block sizes are different, by adding dummy data to whichever of the blocks has the lesser amounts of data, the dummy data being added so that they are arranged in the horizontal direction within the block; error correction encoding with the first and second error correction codes (C1, C2), the block containing the added dummy data and the other block that does not contain added dummy data, wherein from the second error correction code (C2) and dummy data only a redundant code is formed; and eliminating from the error correction encoded data the dummy data and the redundant code, and transmitting the resulting data.
Claim 4
Dependent Claim
180 words
A data transmission method of error correction encoding a data block, which is composed of a two-dimensional array of digital information signals, with a first error correction code (C1) encoding data in the vertical direction of the array, and a second error correction code (C2) encoding data in the horizontal direction of the array, the method comprising the steps of: making equal the size of a first block and the size of a second block, whose block sizes are different, by adding dummy data to whichever of the blocks has the lesser amounts of data, the dummy data being added so that they are arranged in the horizontal direction within the block; error correction encoding with the first and second error correction codes (C1, C2), the block containing the added dummy data and the other block that does not contain added dummy data, wherein from the second error correction code (C2) and dummy data only a redundant code is formed; and eliminating from the error correction encoded data the dummy data and the redundant code, and transmitting the resulting data.
Claim 5
Dependent Claim
69 words
A method according to claim 1 or claim 2 wherein the first and second blocks are composed of digital information signals digitized at the same sampling frequency, and the first block is composed of m bits per unit and the second block is composed of n bits per unit, where m and n are integers and m > n; and dummy data of m-n bit or bits is added.
Claim 6
Dependent Claim
56 words
A method according to claim 3 wherein m = 8 and n = 6 in the use of a symbol as one unit, m = 16 and n = 12 in the use of a word as one unit, and m = 32 and n = 24 in the use of 2-channel data as one unit.
Claim 7
Dependent Claim
61 words
A method according to claim 4 wherein when 12-bit word data are divided into an 8-bit symbol, one symbol is formed by the upper eight bits of one word, another symbol is formed by the lower four bits of the word and the lower four bits of another word, the eight bits of dummy data are added following every three symbols.
Claim 8
Dependent Claim
190 words
A data transmission method for error correction encoding a data block composed of a two-dimensional array of digital information signal, with a first error correction code (C1) encoding data in the vertical direction of the array, and a second error correction code (C2) encoding data in the horizontal or oblique direction of the array, the method comprising the steps of: making equal the size of a first block and the size of a second block whose block sizes are different, by adding dummy data to whichever block has the lesser amount of data, the dummy data being added so that they are arranged in the vertical direction within the block: selectively error correction encoding the block containing the added dummy data and the other block that does not contain any added dummy data using the first and second error correction codes (C1, C2) and in the process forming a redundant code from dummy data only which are error correction encoded using the first error correction code (C1); and eliminating from the error correction encoded data the dummy data and the redundant code, and transmitting the resulting error correction encoded data.
Claim 9
Dependent Claim
190 words
A data transmission method for error correction encoding a data block composed of a two-dimensional array of digital information signal, with a first error correction code (C1) encoding data in the vertical direction of the array, and a second error correction code (C2) encoding data in the horizontal or oblique direction of the array, the method comprising the steps of: making equal the size of a first block and the size of a second block whose block sizes are different, by adding dummy data to whichever block has the lesser amount of data, the dummy data being added so that they are arranged in the vertical direction within the block: selectively error correction encoding the block containing the added dummy data and the other block that does not contain any added dummy data using the first and second error correction codes (C1, C2) and in the process forming a redundant code from dummy data only which are error correction encoded using the first error correction code (C1); and eliminating from the error correction encoded data the dummy data and the redundant code, and transmitting the resulting error correction encoded data.
Claim 10
Dependent Claim
70 words
A method according to claim 6 wherein the first block is composed of an audio signal contained in a constant period of a television signal in the NTSC system which is digitized to form a digital audio signal, and the second block is composed of an audio signal contained in a constant period of a television signal in the CCIR system which is digitized to form a digital audio signal.
Claim 11
Dependent Claim
223 words
A data transmission method for error correction encoding a data block composed of a two-dimensional array of digital information signals, with a first error correction code (C1) encoding data in the vertical direction of the array and a second error correction code (C2) encoding data in the horizontal direction of the array, the method comprising the steps of: making equal the size of a first block and the size of a second block whose block sizes are different, by adding first and second dummy data to whichever of the blocks has the lesser amount of data, the first dummy data being added so that they are arranged in the vertical direction within the block and the second dummy data being added so that they are arranged in the horizontal direction within the block; using the first and second error correction codes (C1, C2), error correction encoding the block containing the added first and second dummy data and the other block which does not contain the first and second dummy data and in the process forming redundant codes from dummy data only which is error correction encoded using the first error correction code (C1) or the second error correction code (C2); and eliminating from the error correction encoded data the first and second dummy data and the redundant codes, and transmitting the resulting data.
Claim 12
Dependent Claim
223 words
A data transmission method for error correction encoding a data block composed of a two-dimensional array of digital information signals, with a first error correction code (C1) encoding data in the vertical direction of the array and a second error correction code (C2) encoding data in the horizontal direction of the array, the method comprising the steps of: making equal the size of a first block and the size of a second block whose block sizes are different, by adding first and second dummy data to whichever of the blocks has the lesser amount of data, the first dummy data being added so that they are arranged in the vertical direction within the block and the second dummy data being added so that they are arranged in the horizontal direction within the block; using the first and second error correction codes (C1, C2), error correction encoding the block containing the added first and second dummy data and the other block which does not contain the first and second dummy data and in the process forming redundant codes from dummy data only which is error correction encoded using the first error correction code (C1) or the second error correction code (C2); and eliminating from the error correction encoded data the first and second dummy data and the redundant codes, and transmitting the resulting data.
Claim 13
Dependent Claim
152 words
A data transmission apparatus of the type which includes an encoder (15) for error correction encoding data in units of a block composed of a two-dimensional array of digital information signals, the apparatus comprising: means (13) for equalizing the size of a first block and the size of a second block, whose block sizes are different, by adding dummy data to whichever of the blocks has the lesser amount of data, that is the smaller block, with at least a part of a sequence of the error correction code being derived from the dummy data only, and so being a redundant code; means (MS2) for selectively supplying the one block that has the dummy data and the other block that does not contain dummy data to the encoder (15); and means (16) for eliminating the dummy data and the redundant code from the error correction encoded blocks and transmitting the resulting data.
Claim 14
Dependent Claim
152 words
A data transmission apparatus of the type which includes an encoder (15) for error correction encoding data in units of a block composed of a two-dimensional array of digital information signals, the apparatus comprising: means (13) for equalizing the size of a first block and the size of a second block, whose block sizes are different, by adding dummy data to whichever of the blocks has the lesser amount of data, that is the smaller block, with at least a part of a sequence of the error correction code being derived from the dummy data only, and so being a redundant code; means (MS2) for selectively supplying the one block that has the dummy data and the other block that does not contain dummy data to the encoder (15); and means (16) for eliminating the dummy data and the redundant code from the error correction encoded blocks and transmitting the resulting data.
Claim 15
Dependent Claim
197 words
A data transmission apparatus of the type having an encoder (15) for error correction encoding a data block composed of a two-dimensional array of digital information signals, by means of a first error correction code (C1) in the vertical direction of the array and a second error correction code (C2) in the horizontal direction of the array, the apparatus comprising: means (13) for equalizing the size of a first block and the size of a second block whose block sizes are different by adding dummy data to whichever of the blocks has the lesser amount of data, the dummy data being added so that they are arranged in the horizontal direction within the block and with at least a part of a sequence of the second error correction code (C2) being derived from the dummy data only and so being a redundant code; means (MS2) for selectively supplying the block containing the added dummy data and the other block that does not contain added dummy data to the encoder (15); and elimination means (16) supplied with output signal of the encoder (15) for eliminating therefrom the dummy data and the redundant code, and transmitting the resulting data.
Claim 16
Dependent Claim
197 words
A data transmission apparatus of the type having an encoder (15) for error correction encoding a data block composed of a two-dimensional array of digital information signals, by means of a first error correction code (C1) in the vertical direction of the array and a second error correction code (C2) in the horizontal direction of the array, the apparatus comprising: means (13) for equalizing the size of a first block and the size of a second block whose block sizes are different by adding dummy data to whichever of the blocks has the lesser amount of data, the dummy data being added so that they are arranged in the horizontal direction within the block and with at least a part of a sequence of the second error correction code (C2) being derived from the dummy data only and so being a redundant code; means (MS2) for selectively supplying the block containing the added dummy data and the other block that does not contain added dummy data to the encoder (15); and elimination means (16) supplied with output signal of the encoder (15) for eliminating therefrom the dummy data and the redundant code, and transmitting the resulting data.
Claim 17
Dependent Claim
67 words
Apparatus according to claim 9 or claim 10 wherein the first and second blocks are composed of digital information signals digitized at the same sampling frequency, the first block having m bits per unit and the second block having n bits per unit, where m and n are integers and m > n, and the means for adding dummy data adds m - n bit or bits.
Claim 18
Dependent Claim
52 words
Apparatus according to claim 11 wherein m = 8, n = 6 in the use of a symbol as one unit, m = 16, n = 12 in the use of a word as one unit, and m = 32, n = 24 in the use of 2-channel data as one unit.
Claim 19
Dependent Claim
29 words
Apparatus according to claim 11 wherein the means (13) for adding dummy data includes a front stage (12) for compressing m bits of data to n bits of data.
Claim 20
Dependent Claim
35 words
Apparatus according to claim 11 wherein the encoder (15) includes a front stage (14) comprising a word/symbol data converter (14) for dividing each data unit into upper symbol bit data and lower symbol bit data.
Claim 21
Dependent Claim
47 words
Apparatus according to claim 14 wherein the means (16) for eliminating the dummy data and the redundant code includes a post stage (17) further comprising a bit number conversion circuit (17) for modifying the bit pattern of the symbol bit data and reducing the DC component thereof.
Claim 22
Independent Claim
367 words
An apparatus for recording PCM audio signals onto a magnetic tape (2) by magnetic heads (HA, HB) and which is capable of selecting between a first mode in which one unit of digital data is composed of m bits and a second mode in which one unit of digital data is composed of an bits, where m and n are integers and m > n, the data of both modes having the same sampling frequency, the apparatus comprising: error correction encoding means (15) commonly used for the first and second modes for encoding the data in units of blocks composed of a two-dimensional array of the digital data; first insertion means (13) for inserting m-n bits of dummy data into the units of data prior to error correction encoding by the error correction encoding means (15) so that a redundant error correction code made up from dummy bits only is produced; first elimination means (16) for eliminating the inserted m-n dummy bits from the data; and addition means (18, 19, 21) for adding an information header, including at least a block synchronization signal, to the data; wherein in the first mode, data units composed of m bits each are encoded by the error correction encoding means (15), the addition means (18, 19, 21) adds a first block synchronization signal to each block of the encoding-processed data, and data from the addition means (18, 19, 21) is transmitted; and in the second mode, the first insertion means (13) inserts dummy bits into each data unit composed of an bits so as to transform it into one unit of m-bit data which is supplied to the error correction encoding means (15) where it is encoded, the first elimination means (16) eliminates the inserted bits and the redundant code from the error correction encoded data as to supply units of n-bit data, these units of n-bit data from the first elimination means (16) are supplied to the addition means (18, 19, 21) which adds a second block synchronization signal to each block, and the resulting data from the addition means (18, 19, 21) is transmitted to the magnetic heads (HA, HB) and is magnetically recorded on the magnetic tape (2).
Claim 23
Independent Claim
367 words
An apparatus for recording PCM audio signals onto a magnetic tape (2) by magnetic heads (HA, HB) and which is capable of selecting between a first mode in which one unit of digital data is composed of m bits and a second mode in which one unit of digital data is composed of an bits, where m and n are integers and m > n, the data of both modes having the same sampling frequency, the apparatus comprising: error correction encoding means (15) commonly used for the first and second modes for encoding the data in units of blocks composed of a two-dimensional array of the digital data; first insertion means (13) for inserting m-n bits of dummy data into the units of data prior to error correction encoding by the error correction encoding means (15) so that a redundant error correction code made up from dummy bits only is produced; first elimination means (16) for eliminating the inserted m-n dummy bits from the data; and addition means (18, 19, 21) for adding an information header, including at least a block synchronization signal, to the data; wherein in the first mode, data units composed of m bits each are encoded by the error correction encoding means (15), the addition means (18, 19, 21) adds a first block synchronization signal to each block of the encoding-processed data, and data from the addition means (18, 19, 21) is transmitted; and in the second mode, the first insertion means (13) inserts dummy bits into each data unit composed of an bits so as to transform it into one unit of m-bit data which is supplied to the error correction encoding means (15) where it is encoded, the first elimination means (16) eliminates the inserted bits and the redundant code from the error correction encoded data as to supply units of n-bit data, these units of n-bit data from the first elimination means (16) are supplied to the addition means (18, 19, 21) which adds a second block synchronization signal to each block, and the resulting data from the addition means (18, 19, 21) is transmitted to the magnetic heads (HA, HB) and is magnetically recorded on the magnetic tape (2).
Claim 24
Dependent Claim
26 words
Apparatus according to claim 16 wherein the first insertion means (13) further comprises means (12) for compressing m bits of data to n bits of data.
Claim 25
Dependent Claim
34 words
Apparatus according to claim 16 wherein the error correction encoding means (15) further comprises a word/symbol data converter (14) for dividing the unit data into upper symbol bit data and lower symbol bit data.
Claim 26
Dependent Claim
38 words
Apparatus according to claim 18 wherein the addition means (18, 19, 21) further comprises a bit number conversion circuit (17) for modifying the bit pattern of the symbol bit data and reducing the direct current (DC) component thereof.
Claim 27
Dependent Claim
24 words
Apparatus according to claim 19 wherein the first insertion means (18, 19) adds the dummy data as the upper bits of the unit data.
Claim 28
Dependent Claim
28 words
Apparatus according to claim 19 wherein the first insertion means (18, 19) adds the dummy data as the upper bits and the lower bits to each data unit.
Claim 29
Dependent Claim
39 words
Apparatus according to claim 16 wherein the addition means (18, 19, 21) for adding an information header also adds to the data a mode identification signal indicating whether the first mode is selected or the second mode is selected.
Claim 30
Dependent Claim
31 words
Apparatus according to claim 19 wherein the first mode is selected when evaporated metal tape (2) is used and the second mode is selected when metal powder tape (2) is used.
References Cited (Backward Citations)
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