SYNCHRONISATION METHOD

• US 20130235166A1
• Filed: 03/07/2012
• Published: 09/12/2013
• Est. Priority Date: 03/07/2012
• Status: Abandoned Application

• Current Assignee: Qualcomm technologies international, ltd. (Qualcomm, Inc.)
• Original Assignee: Cambridge Silicon Radio Limited (Qualcomm, Inc.)
• Inventors: Jones, Nick, Drinkwater, Graham
• Application Number:
  US13/414,113
• Publication Number:
  US 20130235166A1
• Time in Patent Office: Days
• US Class Current: 348/51
• CPC Class Codes: H04J 3/0658 Clock or time synchronisation among packet nodes
• CPC Class Codes: H04N 13/167 Synchronising or controlling image signals
• CPC Class Codes: H04N 13/194 Transmission of image signals
• CPC Class Codes: H04N 13/30 Image reproducers optical systems for producing stereoscopic or other three-dimensional effects G02B30/00
• CPC Class Codes: H04N 13/332 Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
• CPC Class Codes: H04N 13/398 Synchronisation thereof; Control thereof

Abstract

A method by which a transmitter and receiver synchronise. The transmitter and receiver are operable in accordance with a protocol which mandates that some transmissions are jittered. The method comprises the transmitter transmitting a pseudo-random seed to the receiver; determining a jitter value based on the pseudo-random seed; and transmitting a synchronisation packet to the receiver at a time determined by the jitter value. The receiver receives the pseudo-random seed from the transmitter; determines timing of a receive window for the synchronisation packet based on the pseudo-random seed; opens the receive window at the determined time; and receives the synchronisation packet within the receive window.

Claims

1. A transmitter operable in accordance with a protocol which mandates that some transmissions are jittered, the transmitter configured to synchronise with a receiver by:

transmitting a pseudo-random seed to the receiver;

determining a jitter value based on the pseudo-random seed; and

transmitting a synchronisation packet to the receiver at a time determined by the jitter value.

2. A transmitter as claimed in claim 1, wherein the protocol is the Bluetooth Low Energy protocol.

3. A transmitter as claimed in claim 2, wherein the synchronisation packet is a Bluetooth Low Energy advertising packet.

4. A transmitter as claimed in any preceding claim 1, wherein the transmitter is incorporated into a 3D television.

5. A transmitter as claimed in claim 4, wherein the synchronisation packet comprises timing information indicative of the times at which the television displays images for reception by left and right eyes.

6. A method by which a transmitter synchronises with a receiver, the transmitter and receiver operable in accordance with a protocol which mandates that some transmissions are jittered, the method comprising:

transmitting a pseudo-random seed to the receiver;

determining a jitter value based on the pseudo-random seed; and

transmitting a synchronisation packet to the receiver at a time determined by the jitter value.

7. A method as claimed in claim 6, wherein the protocol is the Bluetooth Low Energy protocol and the synchronisation packet is a Bluetooth Low Energy advertising packet.

8. A method as claimed in claim 6, wherein the transmitter is incorporated into a 3D television, and wherein the synchronisation packet comprises timing information indicative of the times at which the television displays images for reception by left and right eyes.

9. A receiver operable in accordance with a protocol which mandates that some transmissions are jittered, the receiver configured to synchronise with a transmitter by:

receiving a pseudo-random seed from the transmitter;

determining timing of a receive window for a synchronisation packet based on the pseudo-random seed;

opening the receive window at the determined time;

receiving the synchronisation packet within the receive window; and

closing the receive window following receipt of the synchronisation packet.

10. A receiver as claimed in claim 9, wherein determining timing of a receive window comprises:

determining an expected time of arrival of the synchronisation packet based on the pseudo-random seed; and

determining a time period of the receive window based on the expected time of arrival of the synchronisation packet.

11. A receiver as claimed in claim 9, wherein the protocol is the Bluetooth Low Energy protocol.

12. A receiver as claimed in claim 9, wherein the receiver is incorporated into a pair of 3D glasses.

13. A receiver as claimed in claim 12, wherein the receiver is further configured to control a timing of shutters of the pair of 3D glasses based on timing information in the synchronisation packet.

14. A method by which a receiver synchronises with a transmitter, the transmitter and receiver operable in accordance with a protocol which mandates that some transmissions are jittered, the method comprising:

receiving a pseudo-random seed from the transmitter;

determining timing of a receive window for a synchronisation packet based on the pseudo-random seed;

opening the receive window at the determined time;

receiving the synchronisation packet within the receive window; and

closing the receive window following receipt of the synchronisation packet.

15. A method as claimed in claim 14, wherein determining timing of a receive window comprises:

determining an expected time of arrival of a synchronisation packet based on the pseudo-random seed; and

determining a time period of the receive window based on the expected time of arrival of the synchronisation packet.

16. A method as claimed in claim 14, wherein the receiver is incorporated into a pair of 3D glasses, the method further comprising:

controlling a timing of shutters of the 3D glasses based on timing information in the synchronisation packet.