Method and system for secure and efficient wireless transmission of HDCP-encrypted HDMI/DVI signals

• US 20080101467A1
• Filed: 10/27/2006
• Published: 05/01/2008
• Est. Priority Date: 10/27/2006
• Status: Abandoned Application

• Current Assignee: Radiospire Networks
• Original Assignee: Radiospire Networks
• Inventors: Zhang, Ming, Liu, Jianhan, Winston, Jeff, Rao, Tandhoni S., MacMullan, Samuel J.
• Application Number:
  US11/588,263
• Publication Number:
  US 20080101467A1
• Time in Patent Office: Days
• US Class Current: 375/240.12
• CPC Class Codes: G06F 3/14 Digital output to display device ; Cooperation and interconnection of the display device with other functional units
• CPC Class Codes: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: H04N 7/0135 involving interpolation processes interpolation-based image scaling G06T3/4007; interpolation for video coding H04N19/587, H04N19/59
• CPC Class Codes: H04N 7/0142 the interpolation being edge adaptive edge detection in television signals H04N5/142; edge-driven scaling G06T3/403
• CPC Class Codes: H04N 7/015 High-definition television systems
• CPC Class Codes: H04N 7/12 Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal H04N7/24 takes precedence

Abstract

The present invention is directed to methods and systems for enabling secure and efficient wireless transmission of HDCP-encrypted high definition (HD) signals. In one aspect, the present invention provides methods and systems for reducing the data rate required to convey HD content to enable direct wireless transmission of HD content. In another aspect, the present invention provides methods and systems for reducing the data rate required to convey HD content that are compatible with HDCP encryption of content. In a further aspect, the present invention provides methods and systems for reducing the data rate required to convey HD content while maintaining a high quality of content.

Claims

1. A method for enabling secure and efficient wireless transmission of high definition (HD) content, comprising:

(a) receiving encoded, encrypted HD content;

(b) decoding said received HD content;

(c) reducing a number of bits required to represent said HD content;

(d) formatting said bit reduced HD content for wireless transmission;

(e) transmitting said formatted HD content;

(f) receiving and de-formatting said transmitted HD content; and

(g) encoding said HD content.

2. The method of claim 1, further comprising:

(h) decrypting said decoded HD content after step (b); and

(i) re-encrypting said bit reduced HD content after step (c).

3. The method of claim 1, wherein step (c) comprises reducing a number of bits required to represent decrypted content.

4. The method of claim 1, wherein step (c) comprises reducing a number of bits required to represent encrypted content.

5. The method of claim 1, further comprising:

(h) decrypting said HD content prior to step (g);

(i) performing HD signal restoration on said decrypted HD content; and

(j) re-encrypting said restored HD content.

6. The method of claim 2, further comprising:

(j) decrypting said HD content prior to step (g);

(k) performing HD signal restoration on said decrypted HD content; and

(l) re-encrypting said restored HD content.

7. The method of claim 1, wherein said HD content includes HDMI (High Definition Media Interface) content.

8. The method of claim 1, wherein said HD content includes DVI (Digital Video Interface) content.

9. The method of claim 2, wherein said encrypting and decrypting are performed using HDCP (High-Definition Content Protection).

10. The method of claim 1, wherein step (c) is performed using HDCP (High-Definition Content Protection) compatible techniques.

11. The method of claim 1, wherein step (c) comprises frame compression of said decrypted HD content.

12. The method of claim 11, wherein said frame compression comprises performing one or more of downscaling, pixel bit width reduction, component down-sampling and color space conversion of said HD content.

13. The method of claim 2, wherein step (c) comprises performing one or more of downscaling, pixel bit width reduction, component down-sampling and color space conversion of said HD content.

14. The method of claim 1, wherein said HD content received in step (a) is encoded using TMDS (Transition Minimized Differential Signaling).

15. The method of claim 1, wherein step (d) comprises applying forward error correction (FEC) to said bit reduced HD content.

16. The method of claim 1, wherein step (d) comprises applying unequal error protection (UEP) to said bit reduced HD content.

17. The method of claim 5, wherein step (i) comprises calculating values for unreliable received content based on values of reliably received neighboring content.

18. The method of claim 1, wherein said HD content comprises audio and/or video.

19. The method of claim 2, wherein portions of step (c) are performed prior to step (h).

20. The method of claim 19, wherein said portions comprise pixel bitwidth reduction.

21. The method of claim 1, wherein step (d) comprises interleaving samples in said bit reduced HD content, and wherein step (f) comprises de-interleaving said samples.

22. The method of claim 5, wherein step (i) comprises receiving an error indicator, said error indicator used to determine unreliable samples in said decrypted HD content.

23. The method of claim 12, wherein said downscaling comprises converting said HD content into an HD content format that requires a lower number of bits to represent said HD content.

24. The method of claim 12, wherein said pixel bitwidth reduction comprises reducing a number of bits required for pixel representation in video content of said HD content.

25. The method of claim 24, wherein said reducing comprises reducing numbers of bits allocated for selected color components in said pixel representation.

26. The method of claim 12, wherein said component down-sampling comprises down-sampling selected color components in video content of said HD content.

27. The method of claim 12, wherein said color space conversion comprises converting video content of said HD content from a first color space representation to a second color space representation.

28. The method of claim 12, wherein said converting comprises converting video content of said HD content from a RGB color space to a YCrCb color space, or vice versa.

29. A method for enabling secure and efficient wireless transmission of high definition (HD) content, comprising:

reducing a number of bits required to represent HD content;

applying unequal error protection (UEP) to said bit reduced HD content;

wherein said UEP biases error protection overhead in favor of selected portions of said HD content.

30. The method of claim 29, wherein said bit reduced HD content is HDCP encrypted prior to applying UEP.

31. The method of claim 29, further comprising:

transmitting said bit reduced HD content such that said selected portions are carried by selected radio frequency (RF) sub-carriers of available RF band.

32. The method of claim 29, further comprising:

increasing a probability that bit errors do not occur on bits of said selected portions of said HD content.

33. The method of claim 29, further comprising:

transmitting said HD content such that said selected portions are carried by selected bit positions within the available FEC codeword.

34. The method of claim 29, further comprising:

transmitting said HD content such that said selected portions are carried using MIMO techniques.

35. A method for enabling secure and efficient wireless transmission of high definition (HD) content, comprising:

receiving encrypted HD content;

reducing a number of bits required to represent said HD content;

transmitting said bit reduced encrypted HD content over a wireless link,

wherein said reducing step operates without decrypting said encrypted HD content.

36. The method of claim 35, wherein said HD content is HDCP encrypted.

37. The method of claim 35, wherein said reducing comprises performing pixel bitwidth reduction.

38. A method for enabling secure and efficient wireless transmission of high definition (HD) content, comprising:

receiving encrypted HD content;

formatting said encrypted HD content for wireless transmission;

transmitting said formatted HD content over a wireless link;

receiving and de-formatting said transmitted HD content;

decrypting said HD content; and

performing HD signal restoration on said HD content.

39. The method of claim 38, wherein said HD content is encrypted using HDCP.

40. The method of claim 38, wherein said performing HD signal restoration step comprises calculating values for unreliable received content based on values of reliably received neighboring content.

41. A method for enabling secure and efficient wireless transmission of high definition (HD) content, comprising:

receiving HD content;

reducing a number of bits required to represent said HD content;

applying unequal error protection (UEP) to said HD content;

formatting said HD content for wireless transmission;

transmitting said formatted HD content over a wireless link; and

receiving and de-formatting said transmitted HD content.