EP0619677A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
System for scrambling a digital video signal
Assignee: Panasonic Holdings Corp
•
Filing: 1994-04-08
•
Granted: —
•
Expires: 2014-04-08
Abstract
Abstract A scramble system of the present invention including a scramble apparatus and a descramble apparatus is applied to a recording and reproducing system or a transmission and receiving system wherein a frame of a digital video signal composed of a plurality of frames is divided into a plurality of predetermined fundamental video blocks corresponding to recording and reproducing processes. Either one of the recording and reproducing system and the transmission and receiving system executes a reconstruction process such as an interpolation process, a high speed playback process or the like. The scramble apparatus executes a scramble process on the inputted digital video signal in the identical processing manner using the fundamental video blocks in the identical position in each of the frames and generates a scrambled video signal, while the descramble apparatus effects reverse conversion of the scramble process executed by the scramble apparatus using the fundamental video blocks on the scrambled video signal generated by the scramble apparatus.
Inventors
- 👤 Susumu Ibaraki
- 👤 Noboru Katta
- 👤 Seiji Nakamura
- 👤 Hiroki Murakami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 19:59
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; H04N9/8047; H04N21/00; H04N21/20; H04N21/23; H04N21/234; H04N21/2347; H04N21/40; H04N21/43; H04N21/44; H04N21/4405; H04N5/00; H04N5/76; H04N5/765; H04N7/00; H04N7/16; H04N7/167; H04N7/1675; H04N7/24
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
194 words
A scramble system for use in a recording and reproducing system or a transmission and receiving system wherein a frame of a digital video signal composed of a plurality of frames is divided into a plurality of predetermined fundamental video blocks corresponding to recording and reproducing processes of said recording and reproducing system or a transmission and receiving processes of said transmission and receiving system, either one of said recording and reproducing system and said transmission and receiving system executing a reconstruction process for reconstructing a further video signal by collecting said fundamental video blocks from an inputted digital video signal composed of a plurality of frames without changing the positions of said fundamental video blocks in each of the frames, said scramble system comprising: scramble means for executing a scramble process on said inputted digital video signal in the identical processing manner using said fundamental video blocks in the identical position in each of the frames and generating a scrambled video signal; and descramble means for effecting reverse conversion of said scramble process executed by said scramble means using said fundamental video blocks on said scrambled video signal generated by said scramble means.
Claim 2
Dependent Claim
55 words
The scramble system as claimed in Claim 1, wherein said reconstruction process includes an interpolation process for replacing a first fundamental video block having an error with another second fundamental video block located in the same position as that of said first fundamental video block having the error, based on an inputted digital video signal.
Claim 3
Dependent Claim
37 words
The scramble system as claimed in Claim 1, wherein said reconstruction process includes a high speed playback process for generating frames for high speed playback, using said fundamental video blocks, based on an inputted digital video signal.
Claim 4
Dependent Claim
87 words
The scramble system as claimed in Claim 1, wherein said scramble means executes said scramble process by encrypting said inputted digital video signal using a block encryption method having an encryption block smaller than said fundamental video block, so as to prevent said encryption blocks from spanning over a plurality of fundamental video blocks; and wherein said descramble means executes said descramble process by reversely converting said scrambled video signal outputted from said scramble means, using the same block encryption method as that of said scramble means.
Claim 5
Dependent Claim
69 words
The scramble system as claimed in Claim 4, wherein said inputted digital video signal includes; (a) a DC component representing an average value of said inputted digital video signal of all pixels; and (b) an AC component including a plurality of frequencies except for said DC component, and wherein said scramble means encrypts at least said DC component of said inputted digital video signal using said fundamental video blocks.
Claim 6
Dependent Claim
163 words
A scramble apparatus for use in a recording and reproducing system or a transmission and receiving system wherein a frame of a digital video signal composed of a plurality of frames is divided into a plurality of predetermined fundamental video blocks corresponding to recording and reproducing processes of said recording and reproducing system or a transmission and receiving processes of said transmission and receiving system, either one of said recording and reproducing system and said transmission and receiving system executing a reconstruction process for reconstructing a further video signal by collecting said fundamental video blocks from an inputted digital video signal composed of a plurality of frames without changing the positions of said fundamental video blocks in each of the frames, said scramble apparatus comprising: scramble means for executing a scramble process on said inputted digital video signal in the identical processing manner using said fundamental video blocks in the identical position in each of the frames and generating a scrambled video signal.
Claim 7
Dependent Claim
55 words
The scramble apparatus as claimed in Claim 6, wherein said reconstruction process includes an interpolation process for replacing a first fundamental video block having an error with another second fundamental video block located in the same position as that of said first fundamental video block having the error, based on an inputted digital video signal.
Claim 8
Dependent Claim
37 words
The scramble apparatus as claimed in Claim 6, wherein said reconstruction process includes a high speed playback process for generating frames for high speed playback, using said fundamental video blocks, based on an inputted digital video signal.
Claim 9
Dependent Claim
54 words
The scramble apparatus as claimed in Claim 6, wherein said scramble means executes said scramble process by encrypting said inputted digital video signal using a block encryption method having an encryption block smaller than said fundamental video block, so as to prevent said encryption blocks from spanning over a plurality of fundamental video blocks.
Claim 10
Dependent Claim
69 words
The scramble apparatus as claimed in Claim 9, wherein said inputted digital video signal includes; (a) a DC component representing an average value of said inputted digital video signal of all pixels; and (b) an AC component including a plurality of frequencies except for said DC component, and wherein said scramble means encrypts at least said DC component of said inputted digital video signal using said fundamental video blocks.
Claim 11
Dependent Claim
153 words
A descramble apparatus for use in a recording and reproducing system or a transmission and receiving system wherein a frame of a digital video signal composed of a plurality of frames is divided into a plurality of predetermined fundamental video blocks corresponding to recording and reproducing processes of said recording and reproducing system or a transmission and receiving processes of said transmission and receiving system, either one of said recording and reproducing system and said transmission and receiving system executing a reconstruction process for reconstructing a further video signal by collecting said fundamental video blocks from an inputted digital video signal composed of a plurality of frames without changing the positions of said fundamental video blocks in each of the frames, said descramble apparatus comprising: descramble means for descrambling an inputted scrambled video signal in the identical processing manner using said fundamental video blocks at the identical position in each of the frames.
Claim 12
Dependent Claim
55 words
The descramble apparatus as claimed in Claim 11, wherein said reconstruction process includes an interpolation process for replacing a first fundamental video block having an error with another second fundamental video block located in the same position as that of said first fundamental video block having the error, based on an inputted digital video signal.
Claim 13
Dependent Claim
37 words
The descramble apparatus as claimed in Claim 11, wherein said reconstruction process includes a high speed playback process for generating frames for high speed playback, using said fundamental video blocks, based on an inputted digital video signal.
Claim 14
Dependent Claim
40 words
The descramble apparatus as claimed in Claim 11, wherein said descramble means executes said descramble process by reversely converting said scrambled video signal using the same block encryption method as that of scramble means for generating said scramble video signal.
Claim 15
Dependent Claim
76 words
The descramble apparatus as claimed in Claim 14, wherein said inputted digital video signal includes; (a) a DC component representing an average value of said inputted digital video signal of all pixels; and (b) an AC component including a plurality of frequencies except for said DC component, and wherein said descramble means descrambles a scramble video signal obtained by encrypting at least said DC component of said inputted digital video signal using said fundamental video blocks.
Claim 16
Dependent Claim
248 words
A scramble system for use in a recording and reproducing system or a transmission and receiving system wherein a frame of a digital video signal composed of a plurality of frames is divided into a plurality of predetermined macro blocks corresponding to recording and reproducing processes of said recording and reproducing system or a transmission and receiving processes of said transmission and receiving system, either one of said recording and reproducing system and said transmission and receiving system executing a reconstruction process for reconstructing a further video signal by collecting said macro blocks from an inputted digital video signal composed of a plurality of frames without changing the positions of said macro blocks in each of the frames, said scramble system comprising scramble means and descramble means, said scramble means comprising at least one of a block replacing unit and an inverting unit, said descramble means comprising at least one of a block inverse replacing unit and an inverting unit, wherein said block replacing unit replaces positions of said macro blocks of each frame of said inputted digital video signal based on an inputted control signal; wherein said inverting unit executes inversion in level of all pixel signals of said inputted digital video signal based on said control signal; and wherein said block inverse replacing unit replaces the positions of said macro blocks of each frame of said inputted digital video signal based on said control signal in a reverse manner to that of said block replacing unit.
Claim 17
Dependent Claim
67 words
The scramble system as claimed in Claim 16, further comprising a control signal generating means for generating said control signal which is the same within a plurality of frames of the same scene of said inputted digital video signal, said scene being defined as a set of frames each frame having correlation coefficients larger than a predetermined threshold value, with adjacent frame in said inputted video signal.
Claim 18
Dependent Claim
31 words
The scramble system as claimed in Claim 16, wherein said control signal is a pseudo noise signal including a pseudo random pattern generated based on a seed of a random number.
Claim 19
Dependent Claim
184 words
A scramble apparatus for use in a recording and reproducing system or a transmission and receiving system wherein a frame of a digital video signal composed of a plurality of frames is divided into a plurality of predetermined macro blocks corresponding to recording and reproducing processes of said recording and reproducing system or a transmission and receiving processes of said transmission and receiving system, either one of said recording and reproducing system and said transmission and receiving system executing a reconstruction process for reconstructing a further video signal by collecting said macro blocks from an inputted digital video signal composed of a plurality of frames without changing the positions of said macro blocks in each of the frames, said scramble apparatus comprising at least one of a block replacing unit and an inverting unit, wherein said block replacing unit replaces positions of said macro blocks of each frame of said inputted digital video signal based on an inputted control signal; and wherein said inverting unit executes inversion in level of all pixel signals of said inputted digital video signal based on said control signal.
Claim 20
Dependent Claim
68 words
The scramble apparatus as claimed in Claim 19, further comprising a control signal generating means for generating said control signal which is the same within a plurality of macro blocks of the same scene of said inputted digital video signal, said scene being defined as a set of frames each frame having correlation coefficients larger than a predetermined threshold value, with adjacent frame in said inputted video signal.
Claim 21
Dependent Claim
31 words
The scramble apparatus as claimed in Claim 19, wherein said control signal is a pseudo noise signal including a pseudo random pattern generated based on a seed of a random number.
Claim 22
Dependent Claim
213 words
A descramble apparatus for use in a recording and reproducing system or a transmission and receiving system wherein a frame of a digital video signal composed of a plurality of frames is divided into a plurality of predetermined macro blocks corresponding to recording and reproducing processes of said recording and reproducing system or a transmission and receiving processes of said transmission and receiving system, either one of said recording and reproducing system and said transmission and receiving system executing a reconstruction process for reconstructing a further video signal by collecting said macro blocks from an inputted digital video signal composed of a plurality of frames without changing the positions of said macro blocks in each of the frames, said descramble apparatus comprising at least one of a block inverse replacing unit and an inverting unit, wherein said block inverse replacing unit replaces the positions of said macro blocks of each frame of said inputted digital video signal based on an inputted control signal in a reverse manner to that of block replacing unit for replacing positions of said macro blocks of each frame of said inputted digital video signal; and wherein said inverting unit executes inversion in level of all pixel signals of said inputted digital video signal based on said control signal.
Claim 23
Dependent Claim
31 words
The descramble apparatus as claimed in Claim 22, wherein said control signal is a pseudo noise signal including a pseudo random pattern generated based on a seed of a random number.
Claim 24
Dependent Claim
136 words
A scramble system for use in a recording and reproducing system or a transmission and receiving system wherein a frame of a digital video signal composed of a plurality of frames is divided into a plurality of predetermined macro blocks, either one of said recording and reproducing system and a transmission and receiving system executing a compression process in a unit of said macro block so that a video segment composed of a plurality of macro blocks has a fixed length after said compression process, said scramble system comprising: scramble means for executing a scramble process by replacing the positions of said macro blocks of said inputted video signal and generating a scramble video signal; and descramble means for effecting reverse conversion of said scramble process executed by said scramble means on said scrambled video signal.
Claim 25
Dependent Claim
114 words
A scramble apparatus for use in a recording and reproducing system or a transmission and receiving system wherein a frame of a digital video signal composed of a plurality of frames is divided into a plurality of macro blocks, either one of said recording and reproducing system and a transmission and receiving system executing a compression process in a unit of said macro block so that a video segment composed of a plurality of macro blocks has a fixed length after said compression process, said scramble apparatus comprising: scramble means for executing a scramble process by replacing the positions of said macro blocks of said inputted video signal and generating a scramble video signal.
Claim 26
Dependent Claim
117 words
A descramble apparatus for use in a recording and reproducing system or a transmission and receiving system wherein a frame of a digital video signal composed of a plurality of frames is divided into a plurality of macro blocks, either one of said recording and reproducing and a transmission system and receiving system executing a compression process in a unit of said macro block so that a video segment composed of a plurality of macro blocks has a fixed length after said compression process, said descramble system comprising: descramble means for descrambling an inputted scrambled video signal by replacing the positions of said macro blocks of said inputted video signal and generating an original digital video signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.