Patent EP0470772A2 successfully refreshed from Google Patents.
EP0470772A2
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Digital video signal reproducing apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1991-08-01
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Granted: —
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Expires: 2011-08-01
Abstract
Abstract A digital video signal reproducing apparatus is arranged such that when a low frequency component of a reproduced signal is extracted, the reproduced signal forms a reproduced image plane. When a low frequency component of a reproduced signal is extracted but a high frequency component thereof is not extracted, the low frequency component thus extracted is compared with a low frequency component of a previously or subsequently reproduced signal. If the two low frequency components are substantially equal to each other, the reproduced signal is concealed to form a reproduced image plane, and if not substantially equal to each other, the reproduced signal forms a reproduced image plane without being concealed.
Inventors
- 👤 Masakazu Nishino
- 👤 Tatsuro Juri
- 👤 Hideki Otaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:57
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926; H04N5/9261; H04N5/9264; H04N5/93; H04N5/94; H04N5/945
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
A digital video signal reproducing apparatus for reproducing a recorded signal which is a digital video signal subjected to orthogonal transformation encoding and recorded in a recording medium, said apparatus comprising: reproducing means for detecting from the recording medium said recorded signal to obtain a reproduced signal; low frequency component detection means for detecting a low frequency component of said reproduced signal; and concealing means for concealing said reproduced signal; wherein said concealing means conceals said reproduced signal when said low frequency component detection means has not detected the low frequency component, but does not conceal said reproduced signal when said low frequency component detection means has detected the low frequency component.
Claim 2
Dependent Claim
112 words
A digital video signal reproducing apparatus for reproducing a recorded signal which is a digital video signal subjected to orthogonal transformation encoding and recorded in a recording medium, said apparatus comprising: reproducing means for detecting from the recording medium said recorded signal to obtain a reproduced signal; low frequency component detection means for detecting a low frequency component of said reproduced signal; and concealing means for concealing said reproduced signal; wherein said concealing means conceals said reproduced signal when said low frequency component detection means has not detected the low frequency component, but does not conceal said reproduced signal when said low frequency component detection means has detected the low frequency component.
Claim 3
Dependent Claim
242 words
A digital video signal reproducing apparatus for reproducing a recording signal which is a digital video signal subjected to orthogonal transformation encoding and recorded in a recording medium, said apparatus comprising: reproducing means for detecting from the recording medium said recorded signal to obtain a reproduced signal; low / high frequency component detection means for detecting low and high frequency components of said reproduced signal; concealing means for concealing said reproduced signal; and low frequency component comparator means for comparing a low frequency component of said reproduced signal with a low frequency component of a previously or subsequently reproduced signal; wherein when said low / high frequency component detection means has not detected the low frequency component of the reproduced signal, said concealing means conceals said reproduced signal, but when said low / high frequency component detection means has detected the low frequency component of said reproduced signal and has not detected the high frequency component of said reproduced signal, if a comparison result of said low frequency component comparator means is such that the low frequency component of said reproduced signal and the low frequency component of said previously or subsequently reproduced signal are substantially equal to each other, said concealing means conceals said reproduced signal and, if the comparison result is such that said low frequency components are not substantially equal to each other, said concealing means does not conceal said reproduced signal, thereby to form a reproduced picture plane.
Claim 4
Dependent Claim
242 words
A digital video signal reproducing apparatus for reproducing a recording signal which is a digital video signal subjected to orthogonal transformation encoding and recorded in a recording medium, said apparatus comprising: reproducing means for detecting from the recording medium said recorded signal to obtain a reproduced signal; low / high frequency component detection means for detecting low and high frequency components of said reproduced signal; concealing means for concealing said reproduced signal; and low frequency component comparator means for comparing a low frequency component of said reproduced signal with a low frequency component of a previously or subsequently reproduced signal; wherein when said low / high frequency component detection means has not detected the low frequency component of the reproduced signal, said concealing means conceals said reproduced signal, but when said low / high frequency component detection means has detected the low frequency component of said reproduced signal and has not detected the high frequency component of said reproduced signal, if a comparison result of said low frequency component comparator means is such that the low frequency component of said reproduced signal and the low frequency component of said previously or subsequently reproduced signal are substantially equal to each other, said concealing means conceals said reproduced signal and, if the comparison result is such that said low frequency components are not substantially equal to each other, said concealing means does not conceal said reproduced signal, thereby to form a reproduced picture plane.
References Cited (Backward Citations)
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