EP0423921A2
Expired / Lapsed
EP
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System and method for conversion of digital video signals
Assignee: Panasonic Holdings Corp
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Filing: 1990-06-25
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Granted: —
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Expires: 2010-06-25
Abstract
Abstract A system converts digital video signals between two digital video signal formats (D1 and D2). The system includes a rate converter (10) which receives digital samples of the video signal in the first format (D1) and at the clock frequency (13.5 MHz) thereof and converts those signals to digital samples of the video signal at the clock frequency (14.318 MHz) of the second signal format (D2). The outputs of the rate converter (10) are combined with appropriate coefficients in a digital filter (28) to produce alternately coefficient modified chroma (CR,CB) and luminance (Y) signals which are combined in an output circuit (44) to produce the digital video signal in the second video signal format (D2). With minor modification, the system can be employed in coverting a video composite signal (D2) to a video component signal (D1).
Inventors
- 👤 Kevin Stec
- 👤 Jerome Daniel Shields
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 06:18
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N7/00; H04N7/01; H04N7/0102
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
113 words
A system for converting a digital video signal from a first signal format to a second signal format comprising: (a) rate converter means responsive to data samples of chroma and luminance components of the digital video signals in the first signal format applied to said rate converter at a first clock frequency for providing as rate converter output data signals data samples of said chroma and luminance components of the digital video signal at a second clock frequency; and (b) output means including a digital filter responsive to said rate converter output data signals for combining said rate conveter data output signals to produce chroma and luminance signals in the second signal format.
Claim 2
Independent Claim
113 words
A system for converting a digital video signal from a first signal format to a second signal format comprising: (a) rate converter means responsive to data samples of chroma and luminance components of the digital video signals in the first signal format applied to said rate converter at a first clock frequency for providing as rate converter output data signals data samples of said chroma and luminance components of the digital video signal at a second clock frequency; and (b) output means including a digital filter responsive to said rate converter output data signals for combining said rate conveter data output signals to produce chroma and luminance signals in the second signal format.
Claim 3
Independent Claim
162 words
A system for converting a digital video signal from a first signal format to a second signal format comprising: (a) rate converter means responsive to data samples of chroma and luminance components of the digital video signals in the first signal format applied to said rate converter at a first clock frequency for providing as rate converter output data signals data samples of said chroma and luminance components of the digital video signal at a second clock frequency; (b) means for providing coefficient data signals required for the conversion of the digital video signal from said first signal format to said second signal format; (c) means responsive to said rate converter output data signals and said coefficient data signals for providing alternately coefficient modified chroma and luminance components to said digital video signal in said second format; and (d) means responsive to said alternate coefficient modified chroma and luminance signals for producing an output digital video signal in said second signal format.
Claim 4
Independent Claim
162 words
A system for converting a digital video signal from a first signal format to a second signal format comprising: (a) rate converter means responsive to data samples of chroma and luminance components of the digital video signals in the first signal format applied to said rate converter at a first clock frequency for providing as rate converter output data signals data samples of said chroma and luminance components of the digital video signal at a second clock frequency; (b) means for providing coefficient data signals required for the conversion of the digital video signal from said first signal format to said second signal format; (c) means responsive to said rate converter output data signals and said coefficient data signals for providing alternately coefficient modified chroma and luminance components to said digital video signal in said second format; and (d) means responsive to said alternate coefficient modified chroma and luminance signals for producing an output digital video signal in said second signal format.
Claim 5
Dependent Claim
60 words
The system of Claim 2 wherein said rate converter includes a plurality of first means for receiving the data sample of the chroma signals in the first digital video signal in the first signal format and a plurality of second means for receiving the data samples of the luminance signals in the digital video signal in the first signal format.
Claim 6
Dependent Claim
27 words
The system of Claim 3 wherein said rate converter output data signals are alternately data samples of the chroma and luminance components of the digital video signal.
Claim 7
Independent Claim
206 words
A system for converting a digital video signal from a first signal format to a second signal format comprising: (a) a plurality of first registers for receiving the chroma components of the digital video signal in the first signal format applied thereto at the clock frequency of the first signal format; (b) a plurality of second registers for receiving the luminance components of the digital video signal in the first signal format applied thereto at the clock frequency of the first signal format; (c) means coupled to receive alternately the outputs of said first and second sets of registers to produce at the output thereof data samples of the chroma and luminance components of the digital video signal at the clock frequency of said second signal format; (d) means for providing coefficient data signals; (e) means for receiving coefficient data signals and said data samples of the chroma and luminance components of the digital video signal at the clock frequency of said second signal format to produce alternately coefficient modified chroma and luminance components for said video signal in said second signal format; and (f) means for combining said coefficient modified chroma and luminance components to produce chroma and luminance signals in said second signal format.
Claim 8
Independent Claim
206 words
A system for converting a digital video signal from a first signal format to a second signal format comprising: (a) a plurality of first registers for receiving the chroma components of the digital video signal in the first signal format applied thereto at the clock frequency of the first signal format; (b) a plurality of second registers for receiving the luminance components of the digital video signal in the first signal format applied thereto at the clock frequency of the first signal format; (c) means coupled to receive alternately the outputs of said first and second sets of registers to produce at the output thereof data samples of the chroma and luminance components of the digital video signal at the clock frequency of said second signal format; (d) means for providing coefficient data signals; (e) means for receiving coefficient data signals and said data samples of the chroma and luminance components of the digital video signal at the clock frequency of said second signal format to produce alternately coefficient modified chroma and luminance components for said video signal in said second signal format; and (f) means for combining said coefficient modified chroma and luminance components to produce chroma and luminance signals in said second signal format.
Claim 9
Independent Claim
90 words
A method for converting a digital video signal from a first signal format to a second signal format comprising the steps of: (a) converting data samples of chroma and luminance compoents of the digital video signals in the first signal format applied at a first clock frequency to data samples of said chroma and luminance components of the digital video signal at a second clock frequency; and (b) combining in a digital filter said rate converter data output signals to produce chroma and luminance signals in the second signal format.
Claim 10
Independent Claim
90 words
A method for converting a digital video signal from a first signal format to a second signal format comprising the steps of: (a) converting data samples of chroma and luminance compoents of the digital video signals in the first signal format applied at a first clock frequency to data samples of said chroma and luminance components of the digital video signal at a second clock frequency; and (b) combining in a digital filter said rate converter data output signals to produce chroma and luminance signals in the second signal format.
Claim 11
Independent Claim
148 words
A method for converting a digital video signal from a first signal format to a second signal format comprising the steps of: (a) responding to data samples of chroma and luminance components of the digital video signals in the first signal format at a first clock frequency to provide data samples of said chroma and luminance components of the digital video signal at a second clock frequency; (b) providing coefficient data signals required for the conversion of the digital video signal from said first signal format to said second signal format; (c) combining said data samples at said second clock frequency and said coefficient data signals to provide alternately coefficient modified chroma and luminance components for said digital video signal in said second format; and (d) responding to said alternate coefficient modified chroma and luminance signals for producing an output digital video signal in said second signal format.
Claim 12
Independent Claim
148 words
A method for converting a digital video signal from a first signal format to a second signal format comprising the steps of: (a) responding to data samples of chroma and luminance components of the digital video signals in the first signal format at a first clock frequency to provide data samples of said chroma and luminance components of the digital video signal at a second clock frequency; (b) providing coefficient data signals required for the conversion of the digital video signal from said first signal format to said second signal format; (c) combining said data samples at said second clock frequency and said coefficient data signals to provide alternately coefficient modified chroma and luminance components for said digital video signal in said second format; and (d) responding to said alternate coefficient modified chroma and luminance signals for producing an output digital video signal in said second signal format.
References Cited (Backward Citations)
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