EP0119081A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for viewing scrambled or unscrambled TV signals
Assignee: Sony Corp
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Filing: 1984-03-09
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Granted: —
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Expires: 2004-03-09
Abstract
Abstract A television signal receiving system for use with a scrambled television signal or a standard television signal includes a recording and reproducing circuit which records and reproduces the received television signal and a monitor for displaying the received or reproduced television signal. A descrambling circuit descrambles the scrambled television signal either as received or reproduced to generate a descrambled television signal when a detector detects the exitence of a scrambled television signal and generates a control signal in response thereto. A switch responds to the control signal and automatically supplies to the monitor either the descrambled television signal or the standard television signal according to the type of television signal being received or reproduced.
Inventors
- 👤 Takashi Okada
- 👤 Takao Mogi
- 👤 Shinjiro Mino
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 00:15
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/913; H04N2005/91357; H04N2005/91364
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
Apparatus for viewing a television signal which may be received from a source thereof in scrambled or standard condition comprising a monitor for displaying the television signal in said standard condition thereof, and a descrambling circuit for descrambling the television signal when the latter has been received in said scrambled condition, thereby to generate a descrambled television signal in said standard condition; characterized by a detecting circuit (36,44) which detects when the received television signal is in said scrambled condition and which generates a control signal in response thereto; and a switch circuit (28, 29, 30) responsive to said control signal which automatically and selectively supplies to said monitor (3) said descrambled television signal and said television signal in said standard condition.
Claim 2
Dependent Claim
122 words
Apparatus for viewing a television signal which may be received from a source thereof in scrambled or standard condition comprising a monitor for displaying the television signal in said standard condition thereof, and a descrambling circuit for descrambling the television signal when the latter has been received in said scrambled condition, thereby to generate a descrambled television signal in said standard condition; characterized by a detecting circuit (36,44) which detects when the received television signal is in said scrambled condition and which generates a control signal in response thereto; and a switch circuit (28, 29, 30) responsive to said control signal which automatically and selectively supplies to said monitor (3) said descrambled television signal and said television signal in said standard condition.
Claim 3
Dependent Claim
29 words
Apparatus as in claim 1; in which said source is a recording and reproducing device (1) for recording a transmitted television signal and for reproducing the recorded television signal.
Claim 4
Dependent Claim
37 words
Apparatus as in claim 2; in which said recording and reproducing device (1) includes switches (11, 12) selectively supplying one of said transmitted television signal and the reproduced television signal to said descrambling circuit (37-41, 43, 45).
Claim 5
Dependent Claim
32 words
Apparatus as in claim l; wherein said television signal in scrambled condition includes an identification signal; characterized in that said detecting circuit (44) detects said identification signal to generate said control signal.
Claim 6
Dependent Claim
58 words
Apparatus as in claim 1; wherein said television signal in scrambled condition includes a key code signal for use in descrambling said television signal in scrambled condition; characterized in that said detecting circuit (36) detects said key code signal, and a circuit (40) controls said descrambling circuit (37-41, 43, 45) in response to the detected key code signal.
Claim 7
Dependent Claim
70 words
Apparatus as in claim 1; wherein said television signal in scrambled condition comprises a scrambled video signal and a scrambled audio signal; characterized in that said descrambling circuit (37-41, 43, 45) includes a video signal descrambling circuit (37-41, 45) for descrambling said scrambled video signal to generate a descrambled video signal and an audio signal descrambling circuit (43) for descrambling said scrambled audio signal to generate a descrambled audio signal.
Claim 8
Dependent Claim
87 words
Apparatus as in claim 6; wherein said television signal in standard condition comprises a standard video signal and a standard audio signal; characterized in that said switch circuit (28, 29, 30) includes a video switch (28) responsive to said control signal for selectively supplying one of said standard video signal and said descrambled video signal to said monitor (3), and an audio switch (29) responsive to said control signal for selectively supplying one of said standard audio signal and said descrambled audio signal to said monitor (3).
Claim 9
Dependent Claim
103 words
Apparatus as in claim 7; further characterized by an RF modulating circuit (42) for converting said descrambled video signal and said descrambled audio signal to an RF frequency descrambled television signal having a predetermined television channel frequency; said source (1) includes an RF modulating circuit (14) for converting said television signal in standard condition to an RF frequency standard television signal having said predetermined television channel frequency; and said switch circuit (28, 29, 30) includes a frequency converted signal switch (30) for selectively supplying to said monitor (3) one of said RF frequency descrambled television signal and said RF frequency standard television signal.
Claim 10
Dependent Claim
93 words
Apparatus as in claim 6; wherein said video signal in scrambled condition includes an inverted video signal portion and an uninverted video signal portion; characterized in that said video signal descrambling circuit (37-41, 45) includes an inverting circuit (39) for reinverting said inverted video signal portion; a switch control circuit (40) for generating a switching signal corresponding to each said inverted video signal portion; and a descrambler switch (41) responsive to said switching signal for alternatively supplying said uninverted video signal portion and said reinverted video signal portion as said descrambled video signal.
Claim 11
Dependent Claim
35 words
Apparatus as in claim 9; wherein said television signal in scrambled condition includes a key code signal; characterized in that said switch control circuit (40) detects said key code signal to generate said switching signal.
Claim 12
Dependent Claim
101 words
Apparatus as in claim 10; wherein each said inverted video signal portion has its white and black levels inverted across a turn-up level; characterized in that said video signal descrambling circuit (37-41, 45) includes a sampling circuit (37) for sampling said video signal in scrambled condition to identify said turn-up level, and a turn-up signal generator (38) for generating a turn-up axis signal corresponding to the identified turn-up level; and said inverting circuit (39) receives said turn-up axis signal for reinverting said white and black levels of each said inverted video signal portion about the level of said turn-up axis signal.
References Cited (Backward Citations)
No citation records indexed.
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