Method and apparatus for optical wireless communication

• US 8,514,208 B2
• Filed: 01/20/2010
• Issued: 08/20/2013
• Est. Priority Date: 01/13/2005
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Inventors: Champion, Mark, Unger, Robert A., Hardacker, Robert
• Primary Examiner(s): Boddie, William
• Assistant Examiner(s): Shapiro, Leonid
• Application Number:
  US12/690,836
• Publication Number:
  US 20110064413A1
• Time in Patent Office: 1,308 Days
• Field of Search: 345/204, 345/1.1, 345/2.1, 345/2.3
• US Class Current: 345/204
• CPC Class Codes: H04B 10/1143 Bidirectional transmission
• CPC Class Codes: H04N 21/4122 additional display device, e.g. video projector digital output for controlling a plurality of local displays G06F3/1423
• CPC Class Codes: H04N 21/4367 Establishing a secure communication between the client and a peripheral device or smart card
• CPC Class Codes: H04N 7/163 by receiver means only
• CPC Class Codes: H04N 7/22 Adaptations for optical transmission

Abstract

Methods and apparatus for optical wireless communication. In one embodiment, a wireless optical video system in which video content (e.g., DVI or HDMI) is transmitted wirelessly between a digital video source and a display device. This wireless optical communication is accomplished using a laser, encoded with the digital video data, directed from an optical transmitter to an optical receiver. In another embodiment, the data to be communicated includes high-definition video content.

Claims

1. A system comprising:

an optical wireless transmitter configured for sending a query corresponding to a preferred format of a display device through radio frequency; and

a receiver simulator coupled to the optical wireless transmitter and having a first shadow memory;

an optical wireless receiver, coupled to the display device, configured for receiving said query and for sending in response requested video format information to the optical wireless receiver through radio frequency; and

a transmitter simulator, coupled to the optical wireless receiver, wherein the transmitter simulator is configured to poll one or more device registers of the display device and send updates to the first shadow memory of the receiver simulator, where said updates are based on information obtained from said polling of the one or more device registers.

2. The system of claim 1, wherein the optical wireless transmitter is configured to receive video data from a video data source and encode said video data into a laser beam in accordance with the received video format information.

3. The system of claim 2, wherein the optical wireless receiver is configured to receive said laser beam and to extract said video data therefrom for presentation by said display device.

4. The system of claim 2, wherein the optical wireless transmitter and the optical wireless receiver are configured to have a control-channel radio frequency communication link to enable said video data source to exchange information with said display device.

5. The system of claim 4, wherein the control-channel radio frequency communication link is based on an Inter-Integrated Circuit (12C) protocol.

6. The system of claim 4, wherein said video data is encrypted using High-Bandwidth Digital-Content Protection.

7. The system of claim 1, wherein said optical wireless receiver is further to recover a video clock signal from said video data, wherein said video clock signal is generated by the optical wireless transmitter and encoded into said video data.

8. The system of claim 1, wherein the receiver simulator is integrated with the optical wireless transmitter, and the transmitter simulator is integrated with the optical wireless receiver.

9. The system of claim 1 wherein the transmitter simulator includes a second shadow memory for maintaining a local copy of the one or more device registers.

10. The system of claim 9, wherein the receiver and transmitter simulators, by virtue of having the first and second shadow memories, respectively, enable the transmitter and receiver to wirelessly communicate while still maintaining High-Bandwidth Digital Content Protection (HDCP) protocol timing.

11. A method comprising the acts of:

sending a query for video format information over a control-channel radio frequency communication link;

receiving over the control-channel radio frequency communication link, and in response to said query, video format information corresponding to a preferred format of a display device;

transmitting video data, encoded with said video format information, to a display device;

polling one or more device registers of the display device; and

sending updates, based on said polling, over the control-channel radio frequency communication link to a first shadow memory local to a source of the video data for access by the source upon request.

12. The method of claim 11, where transmitting video data comprises transmitting video data to said display device, wherein the video data has been encoded, along with said video format information, into a laser beam.

13. The method of claim 11, further comprising the acts of:

transmitting said laser beam from an optical wireless transmitter to an optical wireless receiver; and

receiving said laser beam by the optical wireless receiver to extract said video data therefrom.

14. The method of claim 13, further comprising:

counting a video clock signal rate by the optical wireless transmitter to provide a video clock ; and

encoding said video clock rate count into said video data.

15. The method of claim 14, further comprising recovering said video clock signal from said video data using said optical wireless receiver.

16. The method of claim 11, wherein said video data is encrypted using High-Bandwidth Digital-Content Protection.

17. The method of claim 11, wherein said source and display device exchange information over said control-channel radio frequency communication link to satisfy one or more DVI or HDMI queries.

18. The method of claim 11, further comprising storing data from the one or more device registers in a second shadow memory local to the display device.

19. The method of claim 11, wherein the control-channel radio frequency communication link enables wireless communication between the source and display device in accordance with High-Bandwidth Digital Content Protection (IIDCP) protocol timing.