CA1150818A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Subscription television coding system
Assignee: Oak Industries Inc
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Filing: 1979-11-20
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Granted: 1983-07-26
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Expires: 1999-11-20
Abstract
Abstract ABSTRACT OF THE DISCLOSURE A method of coding and decoding video signals includes suppressing synchronization pulses during the video horizontal and vertical blanking intervals and inserting clock and address information in the suppressed intervals. Digital sound information may be inserted in the suppressed horizontal blanking intervals. At the receiver the unsynchronized video and the clock information are detected and the clock is used to control a sync pulse generator to provide the sync pulses which are then recombined with the unsynchronized video. The digital sound information is used to provide program audio which is then combined with the above-described video signal to provide a television signal usuable in a receiver.
Inventors
- 👤 Pieter Den Toonder
- 👤 Pieter J. Fondse
- 👤 Johannes A. Seltenrijch
- 👤 Cornelis A. De Jong
- 👤 Tom De Koningh
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-10-26 18:25
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; H04N7/087; H04N7/088; H04N7/084; H04N7/085; H04N7/16; H04N7/167; H04N7/171; H04N7/1713
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
A method of coding and decoding video signals in-cluding the steps of: (a) at the transmitter suppressing synchronizing pulses during the video horizontal and vertical blanking intervals, and inserting clock information in suppressed intervals, (b) at the receiver detecting the unsynchronized video and the clock information, using said detected clock information to control a sync pulse generator which independently and in response to said clock information generates sync pulses for the video horizontal and vertical blanking intervals and combin-ing the detected video and independently generated sync pulses to provide a usable video signal.
Claim 2
Independent Claim
93 words
A method of coding and decoding video signals in-cluding the steps of: (a) at the transmitter suppressing synchronizing pulses during the video horizontal and vertical blanking intervals, and inserting clock information in suppressed intervals, (b) at the receiver detecting the unsynchronized video and the clock information, using said detected clock information to control a sync pulse generator which independently and in response to said clock information generates sync pulses for the video horizontal and vertical blanking intervals and combin-ing the detected video and independently generated sync pulses to provide a usable video signal.
Claim 3
Dependent Claim
21 words
The method of claim 1 further characterized in that the clock information is only inserted in the suppressed vertical blanking intervals.
Claim 4
Dependent Claim
34 words
The method of claim 1 further characterized by and including the step of inserting address signals in the sup-pressed blanking intervals at the transmitter, and using said address signals in the receiver decoding process.
Claim 5
Dependent Claim
35 words
The method of claim 1 further characterized by and including the step of inserting digital sound information in the suppressed horizontal blanking intervals at the trans-mitter and detecting said digital sound information at the re-ceiver.
Claim 6
Independent Claim
89 words
A method of detecting and reforming video signals in which the horizontal and vertical blanking intervals have been suppressed and in which clock information and authorization signals have been inserted in suppressed blanking intervals in-cluding the steps of: (a) detecting the unsynchronized video, clock and authorization signals, (b) using said clock signals to control a sync pulse generator which independently and in response to said clock in-formation generates sync pulses for the video horizontal and vertical blanking intervals, (c) and recombining the unsynchronized video and in-dependently generated sync pulses.
Claim 7
Independent Claim
89 words
A method of detecting and reforming video signals in which the horizontal and vertical blanking intervals have been suppressed and in which clock information and authorization signals have been inserted in suppressed blanking intervals in-cluding the steps of: (a) detecting the unsynchronized video, clock and authorization signals, (b) using said clock signals to control a sync pulse generator which independently and in response to said clock in-formation generates sync pulses for the video horizontal and vertical blanking intervals, (c) and recombining the unsynchronized video and in-dependently generated sync pulses.
Claim 8
Dependent Claim
48 words
The method of claim 5 further characterized in that digital sound signals are inserted in the horizontal blank-ing intervals of the video signal and including the steps, at the receiver, of detecting the digital sound signals, providing an audio signal therefrom, and combining the audio and video signals.
Claim 9
Dependent Claim
102 words
Apparatus for decoding a coded television signal in which the synchronizing pulses during the video horizontal and vertical blanking intervals have been suppressed and in which clock signals have been inserted in the suppressed blanking in-tervals, including: (a) means for detecting the clock signals, (b) independent sync pulse generating mean sconnected to said detecting means and operable by said clock signals to generate sync pulses for the video horizontal and vertical blank-ing intervals, and (c) means for combining the independently generated sync pulses from said pulse generating means and the video signal having suppressed synchronized pulses to provide a usable tele-vision signal.
Claim 10
Dependent Claim
102 words
Apparatus for decoding a coded television signal in which the synchronizing pulses during the video horizontal and vertical blanking intervals have been suppressed and in which clock signals have been inserted in the suppressed blanking in-tervals, including: (a) means for detecting the clock signals, (b) independent sync pulse generating mean sconnected to said detecting means and operable by said clock signals to generate sync pulses for the video horizontal and vertical blank-ing intervals, and (c) means for combining the independently generated sync pulses from said pulse generating means and the video signal having suppressed synchronized pulses to provide a usable tele-vision signal.
Claim 11
Dependent Claim
56 words
The apparatus of claim 7 further characterized in that said coded television signal includes digital sound in-formation inserted in the horizontal blanking intervals, said decoding means including: (d) means for detecting said digital sound information and for providing therefrom a reconstituted audio signal, and (e) means for combining said reconstituted audio signal with said video signal.
References Cited (Backward Citations)
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