Television signal recording/reproducing apparatus and method with DC shifter
AssigneeSony Corporation
InventorsKeiji Kanota, Naofumi Yanagihara
Life of this patent
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Abstract
Recording and reproducing a television signal with a DC shifter prevents compression distortion of a PAL plus television signal. The PAL plus television signal includes a vertical resolution signal for enhancing vertical resolution which vertical resolution signal is included in the same compression blocks as some of the component video signals. Such compression blocks are shifted to a DC set up value so that the signals within those compression blocks do not have varying DC offsets which otherwise could result in compression distortion. Similarly, upon reproduction, the DC set up value is removed after decompression and the original television signal is restored with complete vertical resolution.
Claims19
An apparatus for recording a television signal, which includes a vertical resolution signal for enhancing vertical resolution and a component video signal which represents a video image comprising:
- means for segmenting said television signal into compression blocks for digital compression, wherein some of said compression blocks contain both said vertical resolution signal and said component video signal;
- and
- means for DC shifting said vertical resolution signal within said some compression blocks to a DC setup value, thereby preventing compression distortion resulting from compression of signals of varying DC offsets within said some compression blocks during digital recording.
A method for recording a television signal, which includes a vertical resolution signal for enhancing vertical resolution and a component video signal which represents a video image, comprising segmenting said television signal into compression blocks for digital compression, wherein some of said compression blocks contain both said vertical resolution signal and said component video signal;
- and
- DC shifting said vertical resolution signal within said some compression blocks to a DC setup value, thereby preventing compression distortion resulting from compression of signals of varying DC offsets within said some compression blocks during digital recording.
Dependencies are inferred from the claim text.