Method and system for disaggregating audio/visual components

• US 7,295,548 B2
• Filed: 11/27/2002
• Issued: 11/13/2007
• Est. Priority Date: 11/27/2002
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Blank, William Thomas, Atkinson, Robert George, Valavi, Anand, Gray, Donald M III
• Primary Examiner(s): Orgad; Edan
• Assistant Examiner(s): Wong; Blanche
• Application Number:
  US10/306,340
• Publication Number:
  US 20040100942A1
• Time in Patent Office: 1,812 Days
• Field of Search: None
• US Class Current: 370/352
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/169 Special adaptations of TCP, UDP or IP for interworking of IP based networks with other networks protocols for interworking, protocol conversion H04L69/08
• CPC Class Codes: H04N 21/43615 Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals home Audio Video Interoperability [HAVI] data switching networks H04L12/2805

Abstract

The present invention is directed to a method and system for disaggregating and connecting A/V components, and communicating A/V content stream information. An A/V stream from a source device is packaged for transmission over an IP network to one or more output devices. A brick device enables the integration of legacy A/V systems into the network supported A/V system. The brick device operates to provide analog signal and IP protocol conversion, along with the synchronization of received A/V stream data packets. The rendering and play of the A/V stream content on multiple output devices is synchronized to overcome distortions and other network idiosyncrasy and to facilitate a pleasant user experience.

Claims

1. A method for disaggregating audio-visual systems comprising:

providing an audio-visual stream from a source device as one or more data packets for communication over a non-isochronous link of a network;

transmitting said one or more data packets over said non-isochronous link of said network, each of said one or more data packets having a time stamp and a maximum propagation delay indication appended thereto, said maximum propagation delay indication representing a predetermined transmission time of said one or more data packets;

receiving said one or more data packets at multiple output devices and obtaining a time stamp, and a maximum propagation delay indication from each of the one or more received data packets; and

rendering each of said one or more data packets on said multiple output devices in a synchronized fashion, wherein the synchronized fashion is based on an aggregation of said obtained maximum propagation delay indication and said obtained time stamp for each data packet.

2. The method of claim 1 wherein said source device and said multiple output devices are located in geographically disperse locales.

3. The method of claim 1 wherein said source device and a receiving device are located within close proximity and connected on a local area network.

4. The method of claim 1 wherein said data packets incorporate one or more rendering informational items or play informational items.

5. The method of claim 1 wherein said network is an IP network.

6. The method of claim 1 wherein control of the rendering of said audio-visual stream is through time manipulation by utilizing said one or more rendering informational items or play informational items to indicate when said output devices should begin rendering or playing said audio visual stream.

7. A system for disaggregating audio-visual systems comprising:

a first and a second brick;

an audio-visual source device; and

one or more audio-visual output devices;

wherein said audio-visual source device generates an audio-video stream having a time stamp and a maximum propagation delay indication appended thereto and is coupled to an at least partially non-isochronous network via said first brick, said maximum propagation delay indication representing a predetermined transmission time of said audio-video stream;

wherein said one or more output devices are connected to said at least partially non-isochronous network via said second brick, for receiving said audio-video stream and obtaining said time stamp and said maximum propagation delay indication therefrom, synchronizing said audio-video stream based on an aggregation of said maximum propagation delay indication and said time stamp, and rendering said audio-video stream from said audio-video source device based on the synchronizing; and

wherein said first and second brick provide protocol conversion through a network interface component and an analog audio-visual component.

8. A system for disaggregating audio-visual systems comprising:

a brick; and

one or more audio-visual output devices;

wherein said one or more output devices are connected to an at least partially non-isochronous network via said brick, for receiving said audio-video stream and obtaining a time stamp and a maximum propagation delay indication therefrom, said maximum propagation delay indication representing a predetermined transmission time of said audio-video stream, synchronizing said audio-video stream based on an aggregation of said maximum propagation delay indication and said time stamp, and rendering an audio-video stream from an audio-video source device based on the synchronizing; and

wherein said brick provides protocol conversion through a network interface component and an analog audio-visual component.

9. A system as recited in claim 8 wherein said brick is a separate component from said one or more output devices.

10. A system as recited in claim 8 wherein said brick is integrated into said one or more output devices.

11. A method in a computing environment for synchronizing the rendering of a portion of an audio-visual stream from a source device on one or more output devices comprising:

identifying on an at least partially non-isochronous distribution network, a time master;

providing to said source device and the one or more output devices at least one time component, said time component corresponding to information obtained from said time master;

providing to said one or more output devices a maximum propagation delay indication, said maximum propagation delay indication representing a predetermined transmission time of said portion of said audio-visual stream; and

utilizing said time component and said maximum propagation delay indication on said one or more output devices, to establish a common time rendering said portion of said audio-visual stream synchronously.

12. A computer system having a processor, a memory and an operating environment, the computer system operable to execute a method for synchronizing the rendering of a portion of an audio-visual stream from a source device on one or more output devices, the method comprising:

identifying on an at least partially non-isochronous distribution network, a time master;

providing to said source device and the one or more output devices at least one time component, said time component corresponding to information obtained from said time master;

providing to said one or more output devices a maximum propagation delay indication, said maximum propagation delay indication representing a predetermined transmission time of said portion of said audio-visual stream; and

utilizing said time component and said maximum propagation delay indication on said one or more output devices, to establish a common time rendering said portion of said audio-visual stream synchronously.

13. One or more computer-readable media having computer executable instructions for performing a method for disaggregating audio-visual systems, the method comprising:

providing an audio-visual stream from a source device as one or more data packets for communication over a non-isochronous link of a network;

transmitting said one or more data packets over said non-isochronous link of said network, each of said one or more data packets having a time stamp and a maximum propagation delay indication appended thereto, said maximum propagation delay indication representing a predetermined transmission time of said one or more data packets;

receiving said one or more data packets at multiple output devices and obtaining a time stamp, and a maximum propagation delay indication from each of the one or more received data packets; and

rendering each of said one or more data packets on multiple output devices in a synchronized fashion, wherein the synchronized fashion is based on an aggregation of said obtained maximum propagation delay indication and said obtained time stamp for each data packet.