Methods and apparatus for optical wireless communication

• US 7,675,509 B2
• Filed: 01/13/2005
• Issued: 03/09/2010
• Est. Priority Date: 01/13/2005
• Status: Expired due to Fees

• 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: Hardacker, Robert, Unger, Robert A., Champion, Mark
• Primary Examiner(s): Hjerpe; Richard
• Assistant Examiner(s): Shapiro; Leonid
• Application Number:
  US11/036,479
• Publication Number:
  US 20060153572A1
• Time in Patent Office: 1,881 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 combination wireless optical and radio frequency communication system comprising:

a transmitter, coupled to a video data source having a source output, the transmitter comprising an optical wireless transmitter to receive video data from the source output and to encode the video data into a laser beam, the transmitter further comprising a receiver simulator having a first shadow memory, and wherein the transmitter further comprises an associated first radio frequency transceiver for sending a query for video format information, and for receiving, in response to the query, video format information corresponding to a preferred format of the display device; and

a receiver, coupled to a display device, the receiver comprising an optical wireless receiver to receive the laser beam and to decode the video data therefrom, the receiver further comprising a transmitter simulator configured to,

poll one or more device registers of a display device and

send updates to the first shadow memory of the receiver simulator for access by the transmitter upon request, 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 transmitter and receiver engage in two-way communication over a control-channel radio frequency communication link to exchange encryption information to satisfy one or more digital interface queries.

3. 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.

4. The system of claim 3, 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 required protocol timing.

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

6. The system of claim 5, wherein the receiver further comprises an associated second radio frequency transceiver for receiving said query and for sending, in response to the query, requested video formation information to the first radio frequency transceiver.

7. A system comprising:

a transmitter, coupled to a video data source having a source output, said transmitter having an associated first radio frequency transceiver for sending a query for video format information, and for receiving, in response to the query, video format information corresponding to a preferred format of a display device, wherein the transmitter further comprises an optical wireless transmitter to receive video data from the source output and encode said video data into a laser beam in accordance with the received video format information;

a receiver, coupled to a display device, having an associated second radio frequency transceiver for receiving said query and for sending, in response to the query, requested video formation information to the first radio frequency transceiver, wherein the receiver further comprises an optical wireless receiver to receive said laser beam and to extract said video data therefrom for presentation by said display device;

a receiver simulator coupled to the first radio frequency transceiver having a first shadow memory; and

a transmitter simulator coupled to the second radio frequency transceiver, wherein the transmitter simulator is configured to poll one or more device registers and send updates to the first shadow memory of the receiver simulator for access by the transmitter upon request, where said updates are based on information obtained from polling of the one or more device registers.

8. The system of claim 7, wherein said optical wireless transmitter includes a laser diode and a collimating lens, and wherein said laser beam is generated using said laser diode and then directed using said collimating lens.

9. The system of claim 7, wherein said optical wireless receiver includes a focusing lens and a photo diode usable to receive said laser beam.

10. The system of claim 7, wherein said video data is transmitted from said optical wireless transmitter to said optical wireless receiver at a rate of approximately 2.2 Gbps.

11. The system of claim 7, 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.

12. The system of claim 7, wherein said video data has forward error correction encoding applied to correct errors caused by sending said video data from said optical wireless transmitter to said optical wireless receiver.

13. The system of claim 7, wherein the first and second radio frequency transceivers are configured as a control-channel radio frequency communication link to enable said video data source to exchange information with said display device.

14. The system of claim 7, wherein said video data source and display device exchange encryption information over said control-channel radio frequency communication link to satisfy one or more digital interface queries.

15. The system of claim 7, wherein the receiver simulator is integrated with the first radio frequency transceiver, and the transmitter simulator is integrated with the second radio frequency transceiver.

16. The system of claim 7, wherein the transmitter simulator includes a second shadow memory for maintaining a local copy of the one or more device registers.

17. The system of claim 16, 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 required protocol timing.

18. A method comprising:

receiving video data from a source having a source output;

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;

encoding said video data into a laser beam in accordance with the received video format information;

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

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

providing said video data to a display device having a destination input;

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 the source for access by the source upon request.

19. The method of claim 18, wherein transmitting said laser beam comprises transmitting said laser beam using a laser diode and a collimating lens of the optical wireless transmitter.

20. The method of claim 19, further comprising generating said laser beam using said laser diode, and directing said laser beam to said optical wireless receiver using said collimating lens.

21. The method of claim 18, wherein transmitting said laser beam comprises transmitting said laser beam from the optical wireless transmitter to the optical wireless receiver, wherein said optical wireless receiver includes a focusing lens and a photo diode usable to receive said laser beam.

22. The method of claim 18, wherein transmitting said laser beam comprises transmitting said laser beam from said optical wireless transmitter to said optical wireless receiver at a rate of approximately 2.2 Gbps.

23. The method of claim 18, further comprising:

measuring a video clock signal by the optical wireless transmitter to provide a video clock measurement; and

encoding said video clock measurement into said video data.

24. The method of claim 18, further comprising recovering said video clock signal from said video data using said optical wireless receiver.

25. The method of claim 18, wherein said source output and display device exchange information over said control-channel radio frequency communication link to satisfy one or more digital interface queries.

26. The method of claim 18, further comprising applying forward error correction to said video data to correct errors caused by said transmitting said laser beam from the optical wireless transmitter to the optical wireless receiver.

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

28. The method of claim 18, wherein the control-channel radio frequency communication link enables wireless communication between the source and display device in accordance with required protocol timing.