EP0710020A2
Expired / Lapsed
EP
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Video signal format converting circuit
Assignee: Sony Corp
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Filing: 1995-10-23
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Granted: —
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Expires: 2015-10-23
Abstract
Abstract A video signal format converting circuit is disclosed, comprising a signal converting matrix (6) circuit and a filter circuit (25,26) that is constructed of a time delaying device (62-71) for a video signal corresponding to a standard television format. When a digital video signal corresponding to a first video signal format is converted into a second video signal format that is different from the first video signal format and then output, the time delaying device (62-71) of the filter circuit (25,26) is used as a delaying circuit. The output signal of the delaying circuit or the video signal corresponding to the standard television signal format is selectively output. While or after the video signal corresponding to the first video signal format is converted into the video signal corresponding to the second signal format, the video signal is modified so as to protect it from being copied.
Inventors
- 👤 Yasuhide c/o Sony Corporation Mogi
- 👤 Etsuro C/O Sony Corporation Yamauchi
- 👤 Atsushi c/o Sony Corporation Narita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 13:21
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0135; H04N5/00; H04N5/76; H04N5/91; H04N5/913; H04N7/16; H04N7/162; H04N7/165; H04N9/00; H04N9/79; H04N9/7921; H04N9/7925; H04N9/80; H04N9/804; H04N2005/91307; H04N2005/91314; H04N2005/91321; H04N2005/91357; H04N2005/91371
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
132 words
A digital video apparatus for converting a digital video signal composed of a digital luminance signal, a first digital colour difference signal, and a second digital colour difference signal into an analog video signal and outputting the converted signal, comprising: signal modifying means for modifying at least the digital luminance signal so as to protect the digital luminance signal from being analogously copied; signal converting means for converting the modified luminance signal, the first digital colour difference signal, and the second digital colour difference signal into a first video output signal of an analog composite output format and a second video output signal of an output format other than the analog composite output format; and signal outputting means for separately outputting the first video output signal and the second video output signal.
Claim 2
Dependent Claim
45 words
The digital video apparatus as set forth in claim 1, wherein said signal modifying means is adapted for applying a pulse that exceeds the level of the video signal or that varies in the range equivalent to a pedestal level to the digital luminance signal.
Claim 3
Dependent Claim
42 words
The digital video apparatus as set forth in claim 1 or 2, wherein said signal modifying means is adapted for enabling or disabling to modify at least the digital luminance signal corresponding to copyright information transmitted along with the digital video signal.
Claim 4
Dependent Claim
118 words
The digital video apparatus as set forth in claim 1, 2 or 3, wherein said signal converting means includes means for generating a digital colour signal from the first digital colour difference signal and the second digital colour difference signal and means for mixing the digital colour signal and the digital luminance signal so as to generate a digital composite signal, and wherein said signal outputting means includes a first digital - analog converting circuit for converting the digital colour signal and the digital luminance signal into an analog signal and outputting the converted signal and a second digital - analog converting circuit for converting the digital composite signal into an analog signal and outputting the converted signal.
Claim 5
Dependent Claim
52 words
The digital video apparatus as set forth in any one of claims 1 to 4, wherein said signal modifying means includes means for modifying the first digital colour difference signal and for delaying the second digital colour difference signal for the time period necessary to modify the first digital colour difference signal.
Claim 6
Dependent Claim
56 words
The digital video apparatus as set forth in any one of claims 1 to 5, wherein said signal modifying means is adapted for generating a colour burst signal with an inverted phase only in a plurality of predetermined horizontal synchronous signal intervals and for adding the colour burst signal to the first digital colour difference signal.
Claim 7
Dependent Claim
127 words
A digital video apparatus for converting a digital video signal into an analog video signal and outputting the converted signal, comprising: signal modifying means for modifying at least the digital luminance signal so as to protect the digital luminance signal from being analogously copied; signal generating means for generating a digital colour signal from the first digital colour difference signal and the second colour difference signal; mode selecting means for selecting a first mode for outputting the digital colour signal and a second mode for outputting the first digital colour difference signal and the second digital colour difference signal; and signal outputting means for converting the signal selected by said mode selecting means and the digital luminance signal into an analog signal and outputting the converted signal.
Claim 8
Dependent Claim
66 words
The digital video apparatus as set forth in claim 7, further comprising: digital low pass filter means for restricting a frequency band of the first digital colour difference signal and the second digital colour difference signal in the first mode and for delaying the first digital colour difference signal and the second colour difference signal for the time period necessary to modify the digital luminance signal.
Claim 9
Dependent Claim
47 words
The digital video apparatus as set forth in claim 7 or 8, wherein said signal modifying means is adapted for applying a pulse that exceeds the level of the video signal or that varies in the range equivalent to a pedestal level to the digital luminance signal.
Claim 10
Dependent Claim
43 words
The digital video apparatus as set forth in claim 7, 8 or 9, wherein said signal modifying means is adapted for enabling or disabling to modify at least the digital luminance signal corresponding to copyright information transmitted along with the digital video signal.
Claim 11
Dependent Claim
52 words
The digital video apparatus as set forth in any one of claims 7 to 10, wherein said signal modifying means includes means for modifying the first digital colour difference signal and for delaying the second digital colour difference signal for the time period necessary to modify the first digital colour difference signal.
Claim 12
Dependent Claim
56 words
The digital video apparatus as set forth in any one of claims 7 to 11, wherein said signal modifying means is adapted for generating a colour burst signal with an inverted phase only in a plurality of predetermined horizontal synchronous signal intervals and for adding the colour burst signal to the first digital colour difference signal.
Claim 13
Dependent Claim
61 words
The digital video apparatus as set forth in any one of claims 7 to 12, further comprising: a matrix circuit for generating digital RGB signals from the digital luminance signal, the first digital colour difference signal, and the second digital colour difference signal, wherein said mode selecting means is adapted for selecting a third mode for outputting the digital RGB signals.
Claim 14
Independent Claim
119 words
A method for protecting an analog video signal converted from a digital video signal composed of a digital luminance signal, a first digital colour difference signal, and a second digital colour difference signal from being copied, comprising the steps of: modifying at least the digital luminance signal from being analogously copied; generating a digital colour signal from the first digital colour difference signal and the second digital colour difference signal; generating a digital composite signal from the modified digital luminance signal and the digital colour signal; converting the digital colour signal and the digital luminance signal into analog signals and outputting the converted signals; and converting the digital composite signal to an analog signal and outputting the converted signal.
Claim 15
Dependent Claim
42 words
The method as set forth in claim 14, further comprising the step of: modifying the first digital colour difference signal, wherein the second digital colour difference signal is delayed for the time period necessary to modify the first digital colour difference signal.
Claim 16
Dependent Claim
40 words
The method as set forth in claim 14 or 15, wherein said signal modifying step is performed by applying a pulse that exceeds the level of the video signal or that varies in the range equivalent to a pedestal level.
Claim 17
Dependent Claim
51 words
The method as set forth in claim 14, 15 or 16, wherein said signal modifying step is performed by generating a colour burst signal with an inverted phase only in a plurality of predetermined horizontal synchronous signal intervals and adding the colour burst signal to the first digital colour difference signal.
References Cited (Backward Citations)
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