Content management for a video signal

• US 8,355,621 B2
• Filed: 10/25/2005
• Issued: 01/15/2013
• Est. Priority Date: 10/28/2004
• Status: Active Grant

• Current Assignee: Rovi Solutions Corporation (Adeia Inc.)
• Original Assignee: Rovi Solutions Corporation (Adeia Inc.)
• Inventors: Quan, Ronald
• Primary Examiner(s): Tran, Thai
• Assistant Examiner(s): DANG, HUNG Q
• Application Number:
  US11/259,520
• Publication Number:
  US 20060093140A1
• Time in Patent Office: 2,639 Days
• Field of Search: 386/46, 386/52, 386/61, 386/71, 386/94, 386239-260, 380/201, 380/203, 380/204
• US Class Current: 386/254
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00753 wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags
• CPC Class Codes: H04N 2005/91314 the copy protection signal being a pulse signal inserted in blanking intervals of the video signal, e.g. pseudo-AGC pulses, pseudo-sync pulses
• CPC Class Codes: H04N 2005/91321 the copy protection signal being a copy protection control signal, e.g. a record inhibit signal
• CPC Class Codes: H04N 2005/91328 the copy protection signal being a copy management signal, e.g. a copy generation management signal [CGMS]
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 7/169 Systems operating in the time domain of the television signal

Abstract

A high definition television video content management and/or copy protection method and apparatus are achieved by modifying portions of one or more channels of an HDTV (high definition television) signal. These modifications are generally in the blanking intervals but can extend into the overscanned portions. In one version, the signal modification defines tags or trigger bits for a content control system. This modification may follow the HDTV tri-level sync (synchronization) pulses for example, and it may occur in at least one of the HDTV video channels. In another version, portions of the tri-level sync pulse are modified to cause a reference sensing circuit such an AGC system (in a receiving device such as a video recorder) to produce an erroneous output. Optionally, a signal may be added or inserted following the modified tri-level sync pulses. In another version, tri-level pseudo sync pulses are added in blanking or overscanned intervals. These tri-level pseudo sync pulses may be asymmetrical and may be followed by a signal. Further, any of the above modifications or signals or sync signals may be modulated (e.g., amplitude, position, pulse-width). Also these modifications may be provided to a generic television system.

Claims

1. A method of modifying a video signal to control use of the video signal, comprising the acts of:

receiving a video signal generally conforming to a digital television standard; and

modifying a portion of the video signal associated with at least one tri-level synchronization pulse in a horizontal blanking interval in selected scan lines of the video signal by adding at least one positive going pulse to a front or back porch of the horizontal blanking interval, whereby the modified video signal is readily displayed and viewed on a display device without being further processed, and the number of positive going pulses per set of scan lines defines content control information controlling subsequent use of the video signal and indicating a selected one of a set of at least three commands.

2. The method of claim 1, wherein the modifying occurs in at least one of the luma or chroma channels of the video signal.

3. The method of claim 1 wherein the modifying varies between the selected scan lines of the video signal.

4. The method of claim 1, wherein the added pulse extends into an active video portion of the associated scan line.

5. The method of claim 4, wherein the active video portion is an overscan portion of a field of the video signal.

6. The method of claim 1, wherein the act of modifying includes adding the pulse in at least one of the luma or chroma channels of the video signal.

7. The method of claim 1, wherein the added pulse further has a portion which is negative going.

8. The method of claim 1, wherein the added pulse has a configuration of the tri-level synchronization pulse.

9. The method of claim 1, wherein the act of modifying includes adding a plurality of positive going pulses to the blanking interval.

10. The method of claim 1, wherein the act of modifying includes adding a positive going pulse to a plurality of the blanking intervals, a character of the added pulses varying between the scan lines of the video signal.

11. The method of claim 10, wherein the character that varies is at least one of a position, amplitude, width, or number of the added pulses.

12. The method of claim 1, wherein the added pulse is a gray level pulse and is added to the back porch.

13. The method of claim 1, wherein the added pulse has a duration one third to double that of the tri-level synchronization pulse.

14. The method of claim 1, wherein the digital television standard is a high definition television (HDTV) standard.

15. The method of claim 1, wherein the standard is one of 720 line progressive scan (720p) or 1080 line interlaced (1080i) scan.

16. The method of claim 1, wherein the modified portion at least in part defines a predetermined command for content management of the video signal.

17. The method of claim 1, wherein the modified portion inhibits subsequent recording of the video signal by causing a sensing system in an apparatus receiving the video signal to produce an erroneous output.

18. The method of claim 1, wherein the modified portion is in at least two channels of the video signal.

19. The method of claim 18, wherein modifications to the modified portion of the video signal differ between the two channels of the video signal.

20. A method to control use of a video signal comprising the acts of:

receiving a video signal generally conforming to a digital television standard and having tri-level synchronization pulses associated with horizontal blanking intervals of scan lines of the video signal and being readily displayed and viewed on a display device without being further processed, a portion of the video signal associated with at least one tri-level synchronization pulse being modified by having at least one positive going pulse added to a front or back porch of the horizontal blanking interval;

wherein the number of added positive going pulses per set of scan lines at least in part defines a predetermined command selected from one of a set of at least three predetermined commands; and

controlling subsequent use of the video signal in accordance with the command.

21. The method of claim 20, wherein the modified portion occurs in at least one of the luma or chroma channels of the video signal.

22. The method of claim 20, the modification varying between scan lines of the video signal.

23. The method of claim 20, wherein the added pulse extends into an active video portion of the scan line.

24. The method of claim 23, wherein the active video portion is an overscan portion of a field of the video signal.

25. The method of claim 20, wherein the added pulse is in at least one of the luma or chroma channels of the video signal.

26. The method of claim 20, wherein the added pulse further has a portion which is negative going.

27. The method of claim 20, wherein the added pulse has a configuration of the tri-level synchronization pulse.

28. The method of claim 20, wherein the modified portion includes a plurality of positive going pulses added to the horizontal blanking interval.

29. The method of claim 20, wherein the modified portion includes a positive going pulse added to a plurality of the blanking intervals, a character of the added pulses varying between the scan lines of the video signal.

30. The method of claim 29, wherein the character that varies is at least one of a position, amplitude, width, or number of the added pulses.

31. The method of claim 20 wherein the added pulse is a gray level pulse added to the back porch.

32. The method of claim 31, wherein the added pulse has a duration one third to double that of the tri-level synchronization pulse.

33. The method of claim 20, wherein the digital television standard is a high definition television (HDTV) standard.

34. The method of claim 20, wherein the standard is one of 720 line progressive scan (720p) or 1080 line interlaced (1080i) scan.

35. The method of claim 20, wherein the predetermined command is for content management of the video signal.

36. The method of claim 20, wherein the modified portion inhibits subsequent recording of the video signal by causing a sensing system in an apparatus receiving the video signal to produce an erroneous output.

37. The method of claim 20, wherein the modified portion is in at least two channels of the video signal.

38. The method of claim 37, wherein modifications to the modified portion of the video signal differ between the two channels of the video signal.

39. Apparatus for modifying a video signal, comprising:

an input port adapted for receiving a video signal generally conforming to a digital television standard;

a processor coupled to the input port and modifying a portion of the video signal associated with at least one tri-level synchronization pulse in a horizontal blanking interval in selected scan lines of the video signal by adding at least one positive going pulse to a front or back porch of the horizontal blanking interval, whereby the modified video signal is readily displayed and viewed on a display device without being further processed, and the number of positive going pulses per set of scan lines defines content control information controlling subsequent use thereof and indicating a selected one of a set of at least three predetermined commands; and

an output port adapted to output the modified video signal.

40. Apparatus to provide a copy protected video signal, comprising:

a reader having an input port adapted to receive an analog video signal including at least one positive going pulse in a back porch region of a plurality of horizontal blanking intervals and which reads the number of positive going pulses per set of scan lines as indicating a selected one of a set of at least three predetermined commands; and

a compliant device coupled to an output port of the reader and which, responsive to the indication of the command from the reader, outputs an analog video signal including an extra signal or a signal modification providing copy control or copy protection, and wherein the output analog video signal is viewable without being further processed.

41. The apparatus of claim 40, wherein the apparatus reads the at least one positive going pulse in at least one of luma or chroma channels of the received analog video signal.

42. The apparatus of claim 40, wherein the compliant device is one of a video recorder or transmitter.

43. The apparatus of claim 40, wherein the received analog video signal is a high definition video signal.

44. The apparatus of claim 40, wherein the reader reads back porch pulses (BPP), automatic gain control (AGC) pulses, or pseudo-sync (PS) pulses.

45. A method of modifying a video signal to control use of the video signal, comprising the acts of:

receiving a video signal generally conforming to a digital television standard; and

modifying a portion of the video signal associated with at least one tri-level synchronization pulse in a horizontal blanking interval in selected scan lines of the video signal by adding at least one positive going pulse to a front or back porch of the horizontal blanking interval, whereby the modified video signal is readily displayed and viewed on a display device without being further processed, and a pattern of the added positive going pulses per set of scan lines defines content control information controlling subsequent use of the video signal and indicating a selected one of a set of at least three commands.

46. A method to control use of a video signal comprising the acts of:

receiving a video signal generally conforming to a digital television standard and having tri-level synchronization pulses associated with horizontal blanking intervals of scan lines of the video signal and being readily displayed and viewed on a display device without being further processed, a portion of the video signal associated with at least one tri-level synchronization pulse being modified by having at least one positive going pulse added to a front or back porch of the horizontal blanking interval;

wherein a pattern of the added positive going pulses per set of lines at least in part defines a predetermined command selected from one of a set of at least three predetermined commands; and

controlling subsequent use of the video signal in accordance with the command.

47. Apparatus for modifying a video signal, comprising:

an input port adapted for receiving a video signal generally conforming to a digital television standard;

a processor coupled to the input port and modifying a portion of the video signal associated with at least one tri-level synchronization pulse in a horizontal blanking interval in selected scan lines of the video signal by adding at least one positive going pulse to a front or back porch of the horizontal blanking interval, whereby the modified video signal is readily displayed and viewed on a display device without being further processed, and a pattern of the added positive going pulses per set of scan lines defines content control information controlling subsequent use thereof and indicating a selected one of a set of at least three predetermined commands; and

an output port adapted to output the modified video signal.

48. Apparatus to provide a copy protected video signal, comprising:

a reader having an input port adapted to receive an analog video signal including at least one positive going pulse in a back porch region of a plurality of horizontal blanking intervals and which reads a pattern of the positive going pulses per set of scan lines as indicating a selected one of a set of at least three predetermined commands; and

a compliant device coupled to an output port of the reader and which, responsive to the indication of the command from the reader, outputs an analog video signal including an extra signal or a signal modification providing copy control or copy protection, and wherein the output analog video signal is viewable without being further processed.

49. A method of modifying a video signal to control use of the video signal, comprising the acts of:

receiving a video signal generally conforming to a digital television standard; and

modifying a portion of the video signal associated with at least one synchronization pulse in a horizontal blanking interval in selected scan lines of the video signal by adding at least one positive going pulse to a front or back porch of the horizontal blanking interval, whereby the modified video signal is readily displayed and viewed on a display device without being further processed, and a pattern and a number of the added positive going pulses per set of scan lines defines content control information controlling subsequent use of the video signal and indicating a selected one of a set of at least three commands.

50. A method to control use of a video signal comprising the acts of:

receiving a video signal generally conforming to a digital television standard and having synchronization pulses associated with horizontal blanking intervals of scan lines of the video signal and being readily displayed and viewed on a display device without being further processed, a portion of the video signal associated with at least one synchronization pulse being modified by having at least one positive going pulse added to a front or back porch of the horizontal blanking interval;

wherein a pattern and a number of the added positive going pulses per set of scan lines at least in part defines a predetermined command selected from one of a set of at least three predetermined commands; and

controlling subsequent use of the video signal in accordance with the command.

51. Apparatus for modifying a video signal, comprising:

an input port adapted for receiving a video signal generally conforming to a digital television standard;

a processor coupled to the input port and modifying a portion of the video signal associated with at least one synchronization pulse in a horizontal blanking interval in selected scan lines of the video signal by adding at least one positive going pulse to a front or back porch of the horizontal blanking interval, whereby the modified video signal is readily displayed and viewed on a display device without being further processed, and a pattern and a number of the added positive going pulses per set of scan lines defines content control information controlling subsequent use thereof and indicating a selected one of a set of at least three predetermined commands; and

an output port adapted to output the modified video signal.

52. Apparatus to provide a copy protected video signal, comprising:

a reader having an input port adapted to receive an analog video signal including at least one positive going pulse in a back porch region of a plurality of horizontal blanking intervals and which reads a pattern and a number of the positive going pulses per set of scan lines as indicating a selected one of a set of at least three predetermined commands; and

a compliant device coupled to an output port of the reader and which, responsive to the indication of the command from the reader, outputs an analog video signal including an extra signal or a signal modification providing copy control or copy protection, and wherein the output analog video signal is viewable without being further processed.

53. The apparatus of claim 52, wherein the extra signal is provided to the luma or chroma channel of the copy protected video signal.