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Patent US5642169A successfully refreshed from Google Patents.
US5642169A
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US
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Television signal converting apparatus
Assignee: Canon Inc
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Filing: 1994-04-08
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Granted: 1997-06-24
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Expires: 2014-04-08
Abstract
Abstract This invention discloses a television signal converting apparatus for converting a television signal of a certain system containing a luminance signal component and chrominance signal components into a television signal of another system likewise containing a luminance signal component and chrominance signal components, in which the first television signal is digitized in synchronization with a frequency of four times of the color sub carrier frequency of the first television signal, and then the digitized first television signal is converted into a digitized second television signal which is converted into an analog signal in synchronization with a frequency of four times of the color sub carrier frequency of the second television signal, whereby the hardware structure can be significantly simplified and the exact conversion of television signal can be realized.
Inventors
- 👤 Toshinori Yamamoto
- 👤 Hisashi Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:41
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0102; H04N7/0125; H04N9/00; H04N9/64; H04N7/0117; H04N7/0122
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
543 words
A television format converting apparatus for converting a first color television signal which is based upon a first television system and constituted by a luminance signal, a first color signal and a second color signal, into a second color television signal which is based upon a second television system, comprising: a) input means for separately inputting said luminance signal, said first color signal and said second color signal which constitute said first color television signal; b) first analog-digital converter means for receiving said luminance signal contained in said first color television signal and input by said input means, converting said received luminance signal into a digital luminance data having first number of bits per one sample, and outputting the digital luminance data; c) second analog-digital converter means for receiving said first color signal contained in said first color television signal and input by said input means, converting said received first color signal into a digital first color data having second number of bits per one sample, which is less than said first number of bits, and outputting the digital first color data; d) third analog-digital converter means for receiving said second color signal contained in said first color television signal and input by said input means, converting said received second color signal into a digital second color data having said second number of bits per one sample, and outputting the digital second color data; e) luminance data converter means for converting the digital luminance data output from said first analog-digital converter means into a digital luminance data corresponding to said second color television signal; f) first color data converter means for converting the digital first color data output from said second analog-digital converter means into a digital first color data corresponding to said second color television signal; g) second color data converter means for converting the digital second color data output from said third analog-digital converter means into a digital second color data corresponding to said color television signal; h) first adder means for adding the digital luminance data output from said luminance data converter means and the digital first color data output from said first color data converter means; i) second adder means for adding the digital luminance data output from said luminance data converter means and the digital second color data output from said second color data converter means; j) first subtractor means for subtracting the digital first color data output from said first color data converter means, from the digital luminance data output from said luminance data converter means; k) second subtractor means for subtracting the digital second color data output from said second color data converter means, from the digital luminance data output from said luminance data converter means; l) output switching means for outputting, in succession, the digital data from said first adder means, that from said second adder means, that from said first subtractor means and that from said second subtractor means, according to said second color television signal; m) digital-analog converter means for converting a digital data output from said output switching means into an analog signal according to said second color television signal; and n) output means for outputting said analog signal according to said second color television signal, formed by said digital-analog converter means.
Claim 2
Dependent Claim
543 words
A television format converting apparatus for converting a first color television signal which is based upon a first television system and constituted by a luminance signal, a first color signal and a second color signal, into a second color television signal which is based upon a second television system, comprising: a) input means for separately inputting said luminance signal, said first color signal and said second color signal which constitute said first color television signal; b) first analog-digital converter means for receiving said luminance signal contained in said first color television signal and input by said input means, converting said received luminance signal into a digital luminance data having first number of bits per one sample, and outputting the digital luminance data; c) second analog-digital converter means for receiving said first color signal contained in said first color television signal and input by said input means, converting said received first color signal into a digital first color data having second number of bits per one sample, which is less than said first number of bits, and outputting the digital first color data; d) third analog-digital converter means for receiving said second color signal contained in said first color television signal and input by said input means, converting said received second color signal into a digital second color data having said second number of bits per one sample, and outputting the digital second color data; e) luminance data converter means for converting the digital luminance data output from said first analog-digital converter means into a digital luminance data corresponding to said second color television signal; f) first color data converter means for converting the digital first color data output from said second analog-digital converter means into a digital first color data corresponding to said second color television signal; g) second color data converter means for converting the digital second color data output from said third analog-digital converter means into a digital second color data corresponding to said color television signal; h) first adder means for adding the digital luminance data output from said luminance data converter means and the digital first color data output from said first color data converter means; i) second adder means for adding the digital luminance data output from said luminance data converter means and the digital second color data output from said second color data converter means; j) first subtractor means for subtracting the digital first color data output from said first color data converter means, from the digital luminance data output from said luminance data converter means; k) second subtractor means for subtracting the digital second color data output from said second color data converter means, from the digital luminance data output from said luminance data converter means; l) output switching means for outputting, in succession, the digital data from said first adder means, that from said second adder means, that from said first subtractor means and that from said second subtractor means, according to said second color television signal; m) digital-analog converter means for converting a digital data output from said output switching means into an analog signal according to said second color television signal; and n) output means for outputting said analog signal according to said second color television signal, formed by said digital-analog converter means.
Claim 3
Dependent Claim
118 words
An apparatus according to claim 1, wherein said television format converting apparatus further includes: m) synchronization signal separating means for receiving said luminance signal, separating a synchronization signal contained in said first color television signal from said received luminance signal and outputting said separated synchronization signal; n) signal generator means for generating a synchronization signal and a burst signal of said second color television signal, utilizing the synchronization signal of said first color television signal output from said synchronization signal separating means; and o) signal adder means for adding the synchronization signal and the burst signal of said second color television signal, generated by said signal generator means, to the digital data output from said output switching means.
Claim 4
Dependent Claim
97 words
An apparatus according to claim 1, wherein said luminance data converter means includes: 1) time base converter means for converting the time base of the digital luminance data output from said first analog-digital converter means; 2) horizontal sample number converter means for converting the number of samples in the horizontal scanning direction in the digital luminance data of which time base is converted by said time base converter means; and 3) scanning line number converter means for converting the number of horizontal scanning lines in the digital luminance data output from said horizontal sample number converter means.
Claim 5
Dependent Claim
47 words
An apparatus according to claim 3, wherein said time base converter means includes memory means for temporarily storing the digital luminance data output from said first analog-digital converter means, and reading the stored digital luminance data with a rate different from that at the time of storage.
Claim 6
Dependent Claim
123 words
An apparatus according to claim 1, wherein said first color data converter means includes: 1) time base converter means for converting the time base of the digital first color data output from said second analog-digital converter means; 2) horizontal sample number converter means for converting the number of samples in the horizontal scanning direction in the digital first color data of which time base is converted by said time base converter means; 3) scanning line number converter means for converting the number of horizontal scanning lines in the digital first color data output from said horizontal sample number converter means; and 4) level varying means for varying the level of the digital first color data output from said scanning line number converter means.
Claim 7
Dependent Claim
49 words
An apparatus according to claim 5, wherein said time base converter means includes memory means for temporarily storing the digital first color data, output from said second analog-digital converter means and reading the stored digital first color data with a rate different from that at the time of storage.
Claim 8
Dependent Claim
123 words
An apparatus according to claim 1, wherein said second color data converter means includes: 1) time base converter means for converting the time base of the digital second color data output from said third analog-digital converter means; 2) horizontal sample number converter means for converting the number of samples in the horizontal scanning direction in the digital second color data of which time base is converted by said time base converter means; 3) scanning line number converter means for converting the number of horizontal scanning lines of the digital second color data output from said horizontal sample number converter means; and 4) level varying means for varying the level of the digital second color data output from said scanning line number converter means.
Claim 9
Dependent Claim
49 words
An apparatus according to claim 7, wherein said time base converter means includes memory means for temporarily storing the digital second color data output from said third analog-digital converter means, and reading the stored digital second color data with a rate different from that at the time of storage.
Claim 10
Dependent Claim
97 words
An apparatus according to claim 1, wherein said luminance data converter means includes: 1) time base expansion means for expanding the time base of the digital luminance data output from said first analog-digital converter means; 2) horizontal sample number reducing means for reducing the number of samples in the horizontal scanning direction in the digital luminance data of which time base is expanded by said time base expansion means; and 3) scanning line number reducing means for reducing the number of horizontal scanning lines in the digital luminance data output from said horizontal sample number reducing means.
Claim 11
Dependent Claim
47 words
An apparatus according to claim 9, wherein said time base expansion means includes memory means for temporarily storing the digital luminance data output from said first analog-digital converter means, and reading the stored digital luminance data with a rate lower than that at the time of storage.
Claim 12
Dependent Claim
123 words
An apparatus according to claim 1, wherein said first color signal converter means includes: 1) time base expansion means for expanding the time base of the digital first color data output from said second analog-digital converter means; 2) horizontal sample number reducing means for reducing the number of samples in the horizontal scanning direction in the digital first color data of which time base is expanded in said time base expansion means; 3) scanning line number reducing means for reducing the number of horizontal scanning lines in the digital first color data output from said horizontal sample number reducing means; and 4) level varying means for varying the level of the digital first color data output from said scanning line number reducing means.
Claim 13
Dependent Claim
49 words
An apparatus according to claim 11, wherein said time base expansion means includes memory means for temporarily storing the digital first color data output from said second analog-digital converter means, and reading the stored digital first color data with a rate lower than that at the time of storage.
Claim 14
Dependent Claim
123 words
An apparatus according to claim 1, wherein said second color signal converter means includes: 1) time base expansion means for expanding the time base of the digital second color data output from said third analog-digital converter means; 2) horizontal sample number reducing means for reducing the number of samples in the horizontal scanning direction in the digital second color data of which time base is expanded by said time base expansion means; 3) scanning line number reducing means for reducing the number of horizontal scanning lines in the digital second color data output from said horizontal sample number reducing means; and 4) level varying means for varying the level of the digital second color data output from said scanning line number reducing means.
Claim 15
Dependent Claim
49 words
An apparatus according to claim 13, wherein said time base expansion means includes memory means for temporarily storing the digital second color data output from said third analog-digital converter means, and reading the stored digital second color data with a rate lower than that at the time of storage.
Claim 16
Dependent Claim
397 words
A television format converting apparatus for converting a first color television signal which is based upon a first television system and constituted by a luminance signal, a first color signal and a second color signal, into a second color television signal which is based upon a second television system, comprising: a) input means for separately inputting said luminance signal, said first color signal and said second color signal which constitute said first color television signal; b) first analog-digital converter means for receiving said luminance signal contained in said first color television signal and input by said input means, converting said received luminance signal into a digital luminance data having first number of bits per one sample, and outputting the digital luminance data; c) second analog-digital converter means for receiving said first color signal contained in said first color television signal and input by said input means, converting said received first color signal into a digital first color data having second number of bits per one sample, which is less than said first number of bits, and outputting the digital first color data; d) third analog-digital converter means for receiving said second color signal contained in said first color television signal and input by said input means, converting said received second color signal into a digital second color data having said second number of bits per one sample, and outputting the digital second color data; e) television data converter means for converting the digital luminance data output from said first analog-digital converter means, into a digital luminance data corresponding to said second color television signal and for converting the digital first color data output from said second analog-digital converter means, into a digital first color data corresponding to said second color television signal and for converting the digital second color data output from said third analog-digital converter means, into a digital second color data corresponding to said second color television signal; f) operation processing means for operating the digital luminance data and the digital first color data and the digital second color data output from said television data converter means; g) digital-analog converter means for converting the digital data output from said operation processing means, into an analog signal according to said second color television signal; and h) output means for outputting said analog signal according to said second color television signal, formed by said digital-analog converter means.
Claim 17
Dependent Claim
397 words
A television format converting apparatus for converting a first color television signal which is based upon a first television system and constituted by a luminance signal, a first color signal and a second color signal, into a second color television signal which is based upon a second television system, comprising: a) input means for separately inputting said luminance signal, said first color signal and said second color signal which constitute said first color television signal; b) first analog-digital converter means for receiving said luminance signal contained in said first color television signal and input by said input means, converting said received luminance signal into a digital luminance data having first number of bits per one sample, and outputting the digital luminance data; c) second analog-digital converter means for receiving said first color signal contained in said first color television signal and input by said input means, converting said received first color signal into a digital first color data having second number of bits per one sample, which is less than said first number of bits, and outputting the digital first color data; d) third analog-digital converter means for receiving said second color signal contained in said first color television signal and input by said input means, converting said received second color signal into a digital second color data having said second number of bits per one sample, and outputting the digital second color data; e) television data converter means for converting the digital luminance data output from said first analog-digital converter means, into a digital luminance data corresponding to said second color television signal and for converting the digital first color data output from said second analog-digital converter means, into a digital first color data corresponding to said second color television signal and for converting the digital second color data output from said third analog-digital converter means, into a digital second color data corresponding to said second color television signal; f) operation processing means for operating the digital luminance data and the digital first color data and the digital second color data output from said television data converter means; g) digital-analog converter means for converting the digital data output from said operation processing means, into an analog signal according to said second color television signal; and h) output means for outputting said analog signal according to said second color television signal, formed by said digital-analog converter means.
Claim 18
Dependent Claim
25 words
An apparatus according to claim 11, wherein said first color television signal has a resolving power higher than that of said second color television signal.
Claim 19
Dependent Claim
28 words
An apparatus according to claim 11, wherein an aspect ratio of said first color television signal is different from the aspect ratio of said second color television signal.
Claim 20
Dependent Claim
65 words
An apparatus according to claim 11, wherein said first color television signal includes a first color difference signal as said first color signal and a second color difference signal as said second color signal, and said second analog-digital converter means is arranged to digitize the first color difference signal and said third analog digital converter means is arranged to digitize said second color difference signal.
Claim 21
Dependent Claim
116 words
An apparatus according to claim 18, wherein said television data converter means includes: 1) luminance data converter means for converting the digital luminance data output from said first analog-digital converter means, into a digital luminance data corresponding to said second color television signal; 2) first color difference data converter means for converting the digital first color difference data output from said second analog-digital converter means, into a digital first color difference data corresponding to said second color television signal; and 3) second color difference data converter means for converting a digital second color difference data output from said third analog-digital converter means, into a digital second color difference data corresponding to said composite color television signal.
Claim 22
Dependent Claim
196 words
An apparatus according to claim 19, wherein said operation processing means includes: 1) first adder means for adding the digital luminance data output from said luminance data converter means and the digital first color difference data output from said first color difference data converter means; 2) second adder means for adding the digital luminance data output from said luminance data converter means and the digital second color difference data output from said second color difference data converter means; 3) first subtractor means for subtracting the digital first color difference data output from said first color difference data converter means, from the digital luminance data output from said luminance data converter means; 4) second subtractor means for subtracting the digital second color difference data output from said second color difference data converter means, from the digital luminance data output from said luminance data converter means; 5) output switching means for outputting, in succession, the digital data from said first adder means, that from said second adder means, that from said first subtractor means and that from said second subtractor means, in synchronization with a frequency of four times the color sub-carrier frequency of said second television signal.
Claim 23
Dependent Claim
112 words
An apparatus according to claim 20, further comprising: g) synchronization signal separating means for receiving said luminance signal, separating a synchronization signal contained in said first color television signal from said received luminance signal and outputting said separated synchronization signal; h) signal generator means for generating a synchronization signal and a burst signal of said second color television signal, utilizing the synchronization signal of said first color television signal output from said synchronization signal separating means; and i) signal adder means for adding the synchronization signal and the burst signal of said second color television signal, generated by said signal generator means, to the digitized signal output from said output switching means.
Claim 24
Dependent Claim
97 words
An apparatus according to claim 19, wherein said luminance data converter means includes: 1) time base converter means for converting the time base of the digital luminance data output from said first analog-digital converter means; 2) horizontal sample number converter means for converting the number of samples in the horizontal scanning direction in the digital luminance data of which time base is converted by said time base converter means; and 3) scanning line number converter means for converting the number of horizontal scanning lines in the digital luminance data output from said horizontal sample number converter means.
Claim 25
Dependent Claim
47 words
An apparatus according to claim 22, wherein said time base converter means includes memory means for temporarily storing the digital luminance data output from said first analog-digital converter means, and reading the stored digital luminance data with a rate different from that at the time of storage.
Claim 26
Dependent Claim
128 words
An apparatus according to claim 19, wherein said first color difference data converter means includes: 1) time base converter means for converting the time base of the digital first color difference data output from said second analog-digital converter means; 2) horizontal sample number converter means for converting the number of samples in the horizontal scanning direction in the digital first color difference data of which time base is converted by said time base converter means; 3) scanning line number converter means for converting the number of horizontal scanning lines in the digital first color difference data output from said horizontal sample number converter means; and 4) level varying means for varying the level of the digital first color difference data output from said scanning line number converter means.
Claim 27
Dependent Claim
51 words
An apparatus according to claim 24, wherein said time base converter means includes memory means for temporarily storing the digital first color difference data output from said second analog-digital converter means and reading the stored digital first color differences data with a rate different from that at the time of storage.
Claim 28
Dependent Claim
128 words
An apparatus according to claim 19, wherein said second color difference data converter means includes: 1) time base converter means for converting the time base of the digital second color difference data output from said third analog-digital converter means; 2) horizontal sample number converter means for converting the number of samples in the horizontal scanning direction in the digital second color difference data of which time base is converted by said time base converter means; 3) scanning line number converter means for converting the number of horizontal scanning lines of the digital second color difference data output from said horizontal sample number converter means; and 4) level varying means for varying the level of the digital second color difference data output from said scanning line number converter means.
Claim 29
Dependent Claim
51 words
An apparatus according to claim 26, wherein said time base converter means includes memory means for temporarily storing the digital second color difference data output from said third analog-digital converter means, and reading the stored digital second color difference data with a rate difference from that at the time of storage.
Claim 30
Dependent Claim
97 words
An apparatus according to claim 19, wherein said luminance data converter means includes: 1) time base expansion means for expanding the time base of the digital luminance data output from said first analog-digital converter means; 2) horizontal sample number reducing means for reducing the number of samples in the horizontal scanning direction in the digital luminance data of which time base is expanded by said time base expansion means; and 3) scanning line number reducing means for reducing the number of horizontal scanning lines in the digital luminance data output from said horizontal sample number reducing means.
Claim 31
Dependent Claim
45 words
An apparatus according to claim 28, wherein said time base expansion means includes memory means for temporarily storing the digital luminance data output from said first analog-digital converter means, and reading the stored digital luminance data with a rate lower than that in the storage.
Claim 32
Dependent Claim
128 words
An apparatus according to claim 19, wherein said first color difference signal converter means includes: 1) time base expansion means for expanding the time base of the digital first color difference data output from said second analog-digital converter means; 2) horizontal sample number reducing means for reducing the number of samples in the horizontal scanning direction in the digital first color difference data of which time base is expanded by said time base expansion means; 3) scanning line number reducing means for reducing the number of horizontal scanning lines in the digital first color difference data output from said horizontal sample number reducing means; and 4) level varying means for varying the level of the digital first color difference data output from said scanning line number reducing means.
Claim 33
Dependent Claim
51 words
An apparatus according to claim 30, wherein said time base expansion means includes memory means for temporarily storing the digital first color difference data output from said second analog-digital converter means, and reading the stored digital first color difference data with a rate lower than that at the time of storage.
Claim 34
Dependent Claim
128 words
An apparatus according to claim 19, wherein said second color difference signal converter means includes: 1) time base expansion means for expanding the time base of the digital second color difference data output from said third analog-digital converter means; 2) horizontal sample number reducing means for reducing the number of samples in the horizontal scanning direction in the digital second color difference data of which time base is expanded in said time base expansion means; 3) scanning line number reducing means for reducing the number of horizontal scanning lines in the digital second color difference data output from said horizontal sample number reducing means; and 4) level varying means for varying the level of the digital second color difference data output from said scanning line number reducing means.
Claim 35
Dependent Claim
51 words
An apparatus according to claim 32, wherein said time base expansion means includes memory means for temporarily storing the digital second color difference data output from said third analog-digital converter means, and reading the stored digital second color difference data with a rate lower than that at the time of storage.
Claim 36
Dependent Claim
410 words
A television format converting apparatus for converting a first color television signal which is based upon a first television system and constituted by a luminance signal, a first color signal and a second color signal, into a second color television signal which is based upon a second television system, comprising: a) input means for separately inputting said luminance signal, said first color signal and said second color signal which constitute said first color television signal; b) first analog-digital converter means for receiving said luminance signal contained in said first color television signal and input by said input means, converting said received luminance signal into a digital luminance data having first number of bits per one sample, and outputting the digital luminance data; c) second analog-digital converter means for receiving said first color signal contained in said first color television signal and input by said input means, converting said received first color signal into a digital first color data having second number of bits per one sample, which is less than said first number of bits, and outputting the digital first color data; d) third analog-digital converter means for receiving said second color signal contained in said first color television signal and input by said input means, converting said received second color signal into a digital second color data having said second number of bits per one sample, and outputting the digital second color data; e) time base converter means for converting the time base of the digital luminance data output from said first analog-digital converter means, to a time base corresponding to said second color television signal and for converting the time base of the digital first color data output from said second analog-digital converter means, to a time base corresponding to said second color television signal and for converting the time base of the digital second color data output from said third analog-digital converter means, to a time base corresponding to said second color television signal; f) band limiting means for applying a band limitation to each of the digital luminance data and the digital first color data and the digital second color data output from said time base converter means; g) digital-analog converter means for converting the digital data output from said band limiting means into an analog signal according to said second color television signal; and h) output means for outputting said analog signal according to said second color television signal, formed by said digital-analog converter means.
Claim 37
Dependent Claim
410 words
A television format converting apparatus for converting a first color television signal which is based upon a first television system and constituted by a luminance signal, a first color signal and a second color signal, into a second color television signal which is based upon a second television system, comprising: a) input means for separately inputting said luminance signal, said first color signal and said second color signal which constitute said first color television signal; b) first analog-digital converter means for receiving said luminance signal contained in said first color television signal and input by said input means, converting said received luminance signal into a digital luminance data having first number of bits per one sample, and outputting the digital luminance data; c) second analog-digital converter means for receiving said first color signal contained in said first color television signal and input by said input means, converting said received first color signal into a digital first color data having second number of bits per one sample, which is less than said first number of bits, and outputting the digital first color data; d) third analog-digital converter means for receiving said second color signal contained in said first color television signal and input by said input means, converting said received second color signal into a digital second color data having said second number of bits per one sample, and outputting the digital second color data; e) time base converter means for converting the time base of the digital luminance data output from said first analog-digital converter means, to a time base corresponding to said second color television signal and for converting the time base of the digital first color data output from said second analog-digital converter means, to a time base corresponding to said second color television signal and for converting the time base of the digital second color data output from said third analog-digital converter means, to a time base corresponding to said second color television signal; f) band limiting means for applying a band limitation to each of the digital luminance data and the digital first color data and the digital second color data output from said time base converter means; g) digital-analog converter means for converting the digital data output from said band limiting means into an analog signal according to said second color television signal; and h) output means for outputting said analog signal according to said second color television signal, formed by said digital-analog converter means.
Claim 38
Dependent Claim
25 words
An apparatus according to claim 34, wherein said first color television signal has a resolving power higher than that of said second color television signal.
Claim 39
Dependent Claim
28 words
An apparatus according to claim 34, wherein an aspect ratio of said first color television signal is different from the aspect ratio of said second color television signal.
Claim 40
Dependent Claim
86 words
An apparatus according to claim 34, wherein said time base converter means includes memory means for temporarily storing the digital luminance data output from said first analog-digital converter means, the digital first color data output from said second analog-digital converter means and the digital second color data output from said third analog-digital converter means and reading out the stored digital luminance data, the stored digital first color data and the stored digital second color data with a rate different from that at the time of storage.
Claim 41
Dependent Claim
52 words
An apparatus according to claim 34, wherein said band limiting means includes a digital filter for limiting the frequency band region in the horizontal and vertical directions in each of the digital luminance data, the digital first color data and the digital second color data output from said time base converter means.
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