Patent US3579854A successfully refreshed from Google Patents.
Patent EP0574892A2 successfully refreshed from Google Patents.
EP0574892A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for recording and reproducing of a digital video signal
Assignee: Panasonic Holdings Corp
•
Filing: 1993-06-16
•
Granted: —
•
Expires: 2013-06-16
Abstract
Abstract An apparatus for recording and reproducing a video signal has a recording portion and a reproducing portion. The recording portion has an analog-to-digital converter (A/D) for converting analog video signal to digital video signal, a wave form data extraction circuit (3) for extracting digital wave form data expressed in 8-bit detail and carried in a vertical blanking period of the video signal, and a converter (7) for converting the digital wave form data to a quantized wave form data expressed in 2-bit detail. The video signal is recorded on a tape together with the quantized wave form data. The reproducing portion has a wave form data selector (17, 18) for selecting the quantized wave form data, a counter converter (19) for converting the 2-bit quantized wave form data to the original digital wave form data of 8-bit detail, and an adder (24) for adding the digital wave form data in a vertical blanking period of the video signal.
Inventors
- 👤 Akira Iketani
- 👤 Susumu Ikeda
- 👤 Susumu Yamaguchi
- 👤 Chiyoko Matsumi
- 👤 Takayasu Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 14:46
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/913; H04N5/92; H04N5/9201; H04N5/9206; H04N5/926; H04N5/9265; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N2005/91307; H04N2005/91321; H04N2005/91328
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
193 words
An apparatus for recording and reproducing a video signal comprising: (I) recording arrangement comprising: analog-to-digital conversion means (A/D) for converting analog video signal to digital video signal; wave form data extraction means (3) for extracting digital wave form data carried in a vertical blanking period of said video signal, said digital wave form data having a maximum level expressed in n-bits; first conversion means (7) for converting said digital wave form data to a quantized wave form data having a maximum level expressed in m-bits, in which m is not greater than n; and recording processing means (8, 9) for recording video signal together with said quantized wave form data on a recording medium in a predetermined format; and (II) reproducing arrangement comprising: reproducing processing means (11, 12) for reproducing said video signal from said recording medium; wave form data selecting means (17, 18) for selecting said quantized wave form data: first counter conversion means (19) for converting said quantized wave form data of m-bits to said digital wave form data of n-bits; and adder means (24) for adding said digital wave form data in a vertical blanking period of said video signal.
Claim 2
Dependent Claim
24 words
An apparatus as claimed in Claim 1, further comprising a delay time adjustment means (25) for adjusting delay time of various wave form data.
Claim 3
Dependent Claim
114 words
An apparatus as claimed in Claim 1, wherein said recording arrangement further comprises: character data extraction means (2) for extracting digital character data carried in a vertical blanking period of said video signal, said digital character data having a maximum level expressed in n-bits; and second conversion means (6) for converting said digital character data to a quantized character data having a maximum level expressed in m-bits, in which m is less than n; and wherein said reproducing arrangement further comprises: character data selecting means (17, 20) for selecting said quantized character data: and second counter conversion means (21) for converting said quantized character data of m-bits to said digital character data of n-bits.
Claim 4
Dependent Claim
122 words
An apparatus as claimed in Claim 1, wherein said recording arrangement further comprises: copy number data extraction means (119) for extracting digital copy number data carried in a vertical blanking period of said video signal, said digital copy number data having a maximum level expressed in n-bits; and third conversion means (120) for converting said digital copy number data to a quantized copy number data having a maximum level expressed in m-bits, in which m is less than n; and wherein said reproducing arrangement further comprises: copy number data selecting means (129) for selecting said quantized copy number data: and third counter conversion means (126) for converting said quantized copy number data of m-bits to said digital copy number data of n-bits.
Claim 5
Dependent Claim
20 words
An apparatus as claimed in Claim 1, wherein said digital copy number data is following by a synchronization level signal.
Claim 6
Independent Claim
85 words
An apparatus for reproducing a digital video signal containing a quantized wave form data, said apparatus comprising: reproducing processing means (11, 12) for reproducing said video signal from a recording medium; first selecting means (17, 18) for selecting said quantized wave form data: first counter conversion means (19) for converting said quantized wave form data of m-bits to a digital wave form data of n-bits; and adder means (24) for adding said digital wave form data in a vertical blanking period of said video signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.