Method and system for wireless transmission

• US 7,733,294 B2
• Filed: 09/20/2005
• Issued: 06/08/2010
• Est. Priority Date: 11/03/2004
• 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: Unger, Robert Allan
• Primary Examiner(s): Mengistu; Amare
• Assistant Examiner(s): ZHOU, HONG
• Application Number:
  US11/231,051
• Publication Number:
  US 20060092959A1
• Time in Patent Office: 1,722 Days
• Field of Search: 345/504, 345/2.3, 345/1.2, 345/538, 345/541, 709/204, 709/205, 709/208, 370/310, 370/412, 710/310
• US Class Current: 345/2.3
• CPC Class Codes: G06F 13/4045 where the bus bridge performs an extender function
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks

Abstract

Multimedia from a source can be wirelessly transmitted in an infrared system to a display. To support rapid reads of data written into a slave at the display by a master at the source in accordance with I²C protocol, a master simulator on the display side continually polls the slave for changes, and maintains a shadow memory in a slave simulator at the source side current, so that reads from the master may be immediately executed from the shadow memory in the slave simulator without transmitting the wireless link.

Claims

1. A multimedia display system, comprising:

a source system of multimedia data;

a display system of multimedia data, the display system including a display, the source system and display system communicating wirelessly with each other using an optical communication system;

the source system having at least one master writing data to at least one slave in the display system;

at least one slave simulator in the source system and mirroring at least a portion of the slave written to by the master, read commands from the master being satisfied from the slave simulator, the source system including a transmitting circuit providing the multimedia data in the form of an electrical signal to a laser driver which, in turn, controls a laser transmitter in accordance with the electrical signal to convert the electrical signal into an optical signal;

at least one master simulator in the display system and communicating with the slave to update the slave simulator with changes in the slave;

a first shadow memory in the slave simulator; and

a second shadow memory in the master simulator, the master simulator operating in an automatic loop to compare data in the slave to data in the second shadow memory and based thereon updating the first shadow memory.

2. The system of claim 1, wherein the multimedia is at least one of:

Digital Visual Interface (DVI) multimedia, and High Definition Multimedia Interface (HDMI) multimedia.

3. The system of claim 2, wherein the wireless link is in the infrared band.

4. The system of claim 1, wherein data is transmitted between the master and the slave at least in part using I²C protocol.

5. The system of claim 1, further comprising:

a collimating lens focusing the optical signal such that it is properly receivable by a receiving electro-optical interface of the display system; and

a focusing lens associated with the display system focusing the optical signal onto a photo diode, the photo diode converting the optical signal into a digital electrical signal which is passed to a trans-impedance amplifier and then to a limiting amplifier.

6. A system for displaying multimedia from a source system on a display system in infrared wireless communication with the source system using a wireless link, comprising:

means for writing information useful in displaying the multimedia from a master at the source system to a slave at the display system;

means for satisfying subsequent read commands from the master for the data from a slave simulator at the source system without sending the read command over the wireless link, wherein the source system includes a transmitting circuit providing the multimedia in the form of a digital electrical signal to a laser driver which, in turn, controls a laser diode, wherein the means for satisfying includes at least one master simulator in the display system and communicating with the slave to update the slave simulator with changes in the slave, a first shadow memory being in the slave simulator and a second shadow memory being in the master simulator, the master simulator comparing data in the slave to data in the second shadow memory and based thereon updating the first shadow memory.

7. The system of claim 6, wherein the slave simulator in the source system mirrors at least a portion of the slave written to by the master.

8. The system of claim 6, wherein the multimedia is at least one of:

Digital Visual Interface (DVI) multimedia, and High Definition Multimedia Interface (HDMI) multimedia, the wireless link is in the infrared band, and data is transmitted between the master and the slave at least in part using I2C protocol.

9. The system of claim 6, comprising:

a collimating lens focusing the optical signal such that it is properly receivable by a receiving electro-optical interface of the display system; and

a focusing lens associated with the display system focusing the optical signal onto a photo diode, the photo diode converting the optical signal into a digital electrical signal which is passed to at least one amplifier.

10. A method for displaying multimedia from a source on a display, comprising:

wirelessly transmitting the multimedia from the source to the display using an optical wireless link;

writing data to a slave at the display from a master at the source using a wireless link;

sending, over the wireless link, changes in the slave to at least one first shadow memory at the source, so that the first shadow memory mirrors contents of the slave;

immediately executing, from the first shadow memory, read commands from the master addressed to the slave, wherein the first shadow memory is associated with a slave simulator, at least one master simulator in the display and communicating with the slave to update the slave simulator with changes in the slave, further comprising a second shadow memory associated with the master simulator, the master simulator comparing data in the slave to data in the second shadow memory and based thereon updating the first shadow memory.