Method of lip synchronizing for wireless audio/video network and apparatus for the same

• US 20070153762A1
• Filed: 11/29/2006
• Published: 07/05/2007
• Est. Priority Date: 01/05/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Seong-Soo, Kim, Jae-Kwon, Park, Hee-Yong
• Application Number:
  US11/605,306
• Publication Number:
  US 20070153762A1
• Time in Patent Office: Days
• US Class Current: 370/350
• CPC Class Codes: H04N 21/2368 Multiplexing of audio and video streams
• CPC Class Codes: H04N 21/4305 Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets arrangements for synchronising receiver with transmitter by comparing receiver clock with transmitter clock H04L7/0012; arrangements for synchronising receiver with transmitter wherein the receiver takes measures against momentary loss of synchronisation H04L7/0083
• CPC Class Codes: H04N 21/43072 of multiple content streams on the same device
• CPC Class Codes: H04N 21/4341 Demultiplexing of audio and video streams
• 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
• CPC Class Codes: H04N 21/43637 involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11] arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114
• CPC Class Codes: H04N 21/439 Processing of audio elementary streams
• CPC Class Codes: H04N 21/647 Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless real-time session protocols H04L65/1101
• CPC Class Codes: H04N 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 5/775 between a recording apparatus and a television receiver
• CPC Class Codes: H04N 9/8042 involving data reduction
• CPC Class Codes: H04W 56/009 Closed loop measurements

Abstract

Provided is a lip synchronization method in a wireless A/V network. The method includes generating audio and video packets including time stamps and transmitting the audio and video packets to devices in the wireless A/V network, in which the time stamp has information indicating reproduction time points of both audio data included in the audio packet and video data included in the video packet.

Claims

1. A synchronization method in a wireless network, the method comprising:

generating audio and video packets including time stamps; and

transmitting the audio and video packets to devices in the wireless network,

wherein the time stamp includes information indicating reproduction time points of both audio data included in the audio packet and video data included in the video packet.

2. The method of claim 1, wherein the devices are temporally synchronized through a predetermined beacon frame.

3. The method of claim 2, wherein the beacon frame is transmitted from a network management device managing a communication timing of the wireless network.

4. The method of claim 1, further comprising:

receiving a beacon frame;

synchronizing a timer by using the beacon frame; and

providing the time stamp by using the synchronized timer.

5. A synchronization method in a wireless network, the method comprising:

receiving an audio packet;

extracting both audio data and a time stamp indicating an output time point of the audio data from the audio packet; and

outputting the audio data at the time point indicated by the time stamp.

6. The method of claim 5, further comprising decoding the audio data, wherein the outputting comprises outputting the decoded audio data.

7. The method of claim 5, wherein the audio packet is transmitted from a source device temporally synchronized through a predetermined beacon frame.

8. The method of claim 7, wherein the beacon frame is transmitted from a network management device managing a communication timing of the wireless network.

9. The method of claim 5, further comprising:

receiving a beacon frame;

synchronizing a timer by using the beacon frame; and

determining a reproduction time point of the audio data by using the synchronized timer, the reproduction time point of the audio data being indicated by the time stamp.

10. A synchronization method in a wireless network, the method comprising:

receiving a video packet;

extracting both video data and a time stamp indicating an output time point of the video data from the video packet; and

outputting the video data at the time point indicated by the time stamp.

11. The method of claim 10, further comprising decoding the video data, wherein the outputting comprises outputting the decoded video data.

12. The method of claim 10, wherein the video packet is transmitted from a source device temporally synchronized through a predetermined beacon frame.

13. The method of claim 12, wherein the beacon frame is transmitted from a network management device managing a communication timing of the wireless network.

14. The method of claim 10, further comprising:

receiving a beacon frame;

synchronizing a timer by using the beacon frame; and

determining a reproduction time point of the video data by using the synchronized timer, the reproduction time point of the video data being indicated by the time stamp.

15. A source device comprising:

a packet-processing unit which generates audio and video packets including time stamps; and

a wireless communication unit which transmits the audio and video packets to devices in a wireless network,

wherein the time stamp includes information indicating reproduction time points of both audio data included in the audio packet and video data included in the video packet.

16. The source device of claim 15, wherein the devices are temporally synchronized through a predetermined beacon frame.

17. The source device of claim 16, wherein the beacon frame is transmitted from a network management device managing a communication timing of the wireless network.

18. The source device of claim 15, further comprising a time management unit which synchronizes a timer by using a beacon frame received through the wireless communication unit and provides the time stamp by using the synchronized timer.

19. An audio reproduction device comprising:

a wireless communication unit which receives an audio packet;

a packet-processing unit which extracts both audio data and a time stamp indicating an output time point of the audio data from the audio packet; and

a control unit which outputs the audio data at the time point indicated by the time stamp.

20. The audio reproduction device of claim 19, further comprising an audio-decoding unit which decodes the audio data, wherein the control unit outputs the decoded audio data.

21. The audio reproduction device of claim 19, wherein the audio packet is transmitted from a source device temporally synchronized through a predetermined beacon frame.

22. The audio reproduction device of claim 21, wherein the beacon frame is transmitted from a network management device managing a communication timing of the wireless network.

23. The audio reproduction device of claim 19, wherein the control unit synchronizes a timer by using a beacon frame received through the wireless communication unit, and determines a reproduction time point of the audio data by using the synchronized timer, the reproduction time point of the audio data being indicated by the time stamp.

24. A video reproduction device comprising:

a wireless communication unit which receives a video packet;

a packet-processing unit which extracts both video data and a time stamp indicating an output time point of the video data from the video packet; and

a control unit which outputs the video data at the time point indicated by the time stamp.

25. The video reproduction device of claim 24, further comprising a video-decoding unit which decodes the video data, wherein the control unit outputs the decoded video data.

26. The video reproduction device of claim 24, wherein the video packet is transmitted from a source device temporally synchronized through a predetermined beacon frame.

27. The video reproduction device of claim 26, wherein the beacon frame is transmitted from a network management device managing a communication timing of the wireless network.

28. The video reproduction device of claim 24, wherein the control unit synchronizes a timer by using a beacon frame received through the wireless communication unit, and determines a reproduction time point of the video data by using the synchronized timer, the reproduction time point of the video data being indicated by the time stamp.