Multimedia client/server system with audio synchronization and methods for use therewith

• US 20080178243A1
• Filed: 01/19/2007
• Published: 07/24/2008
• Est. Priority Date: 01/19/2007
• Status: Abandoned Application

• Current Assignee: VIXS Systems Incorporated (Pixelworks Incorporated)
• Original Assignee: VIXS Systems Incorporated (Pixelworks Incorporated)
• Inventors: Dong, SuiWu, Jin, Song
• Application Number:
  US11/655,544
• Publication Number:
  US 20080178243A1
• Time in Patent Office: Days
• US Class Current: 725/116
• CPC Class Codes: H04N 21/21 Server components or server architectures
• CPC Class Codes: H04N 21/23 Processing of content or additional data; Elementary server operations; Server middleware
• 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 21/64784 Data processing by the network data processing in packet switching systems H04L12/56; flow control in packet networks H04L47/10; intermediate storage or scheduling H04L49/90; provisioning of proxy services in data packet switching networks H04L67/56

Abstract

A multimedia server module that is coupleable to a plurality of multimedia sources that produce at least one video signal and an associated audio signal includes an encoder module that encodes the at least one video signal to produce an encoded video signal. An RF server transceiver module transmits a server signal that includes the encoded video signal over a wireless communication path, receives a client signal from a client module over the wireless communication path and demodulates the client signal to produce a video timing signal. An audio processing module produces an audio output from the audio signal having a time delay, wherein the time delay is based on the video timing signal.

Claims

1. A multimedia client/server system comprising:

a multimedia server module, coupleable to a plurality of multimedia sources that produce at least one video signal and an associated audio signal, the multimedia server module including;

an encoder module that encodes the at least one video signal to produce an encoded video signal;

an RF server transceiver module, coupled to the encoder module, that transmits a server signal that includes the encoded video signal over a wireless communication path, that receives a client signal over the wireless communication path and that demodulates the client signal to produce a video timing signal; and

an audio processing module, coupled to the RF transceiver module, that produces an audio output from the audio signal having a time delay, wherein the time delay is based on the video timing signal; and

a client module, coupleable to at least one client device, the client module including;

an RF client transceiver module that receives the server signal over the wireless communication path and demodulates the server signal to produce a received encoded signal; and

a decoder module, coupled to the RF client transceiver module, that decodes the received encoded signal into a decoded output signal and the video timing signal;

wherein the RF client transceiver module transmits the client signal that includes the video timing signal over the wireless communication path.

2. The multimedia client/server system of claim 1 wherein the audio processing module includes a delay controller that generates a delay signal based on the video timing signal and a server timing signal, and an adjustable delay module that generates the time delay based on the delay signal.

3. The multimedia client/server system of claim 2 wherein delay controller generates the delay signal based on the difference between the video timing signal and the server timing signal.

4. The multimedia client/server system of claim 3 wherein delay controller generates the delay signal based on the difference between the video timing signal and the server timing signal and a delay offset.

5. The multimedia client/server system of claim 2 wherein the audio processing module further includes an audio interface module that produces the audio output in a digital audio format from a delayed audio signal produced by the adjustable delay module.

6. The multimedia client/server system of claim 2 wherein the audio signal includes a digital audio signal and the audio processing module further includes a parser that generates the server timing signal from the digital audio signal.

7. The multimedia client/server system of claim 2 wherein the audio signal includes an analog audio signal and the audio processing module further includes an analog to digital converter for converting the audio signal into digital audio.

8. The multimedia client/server system of claim 2 wherein the server timing signal is generated based on a server clock.

9. The multimedia client/server system of claim 2 wherein the video timing signal is generated based on a time stamp encoded in the encoded video signal by the encoder module.

10. The multimedia client/server system of claim 1 wherein the encoder module transcodes the at least one video signal.

11. A multimedia server module, coupleable to a plurality of multimedia sources that produce at least one video signal and an associated audio signal, the multimedia server module including:

an encoder module that encodes the at least one video signal to produce an encoded video signal;

an RF server transceiver module, coupled to the encoder module, that transmits a server signal that includes the encoded video signal over a wireless communication path, that receives a client signal from a client module over the wireless communication path and that demodulates the client signal to produce a video timing signal; and

an audio processing module, coupled to the RF transceiver module, that produces an audio output from the audio signal having a time delay, wherein the time delay is based on the video timing signal.

12. The multimedia server module of claim 11 wherein the audio processing module includes a delay controller that generates a delay signal based on the video timing signal and a server timing signal, and an adjustable delay module that generates the time delay based on the delay signal.

13. The multimedia server module of claim 12 wherein delay controller generates the delay signal based on the difference between the video timing signal and the server timing signal.

14. The multimedia server module of claim 13 wherein delay controller generates the delay signal based on the difference between the video timing signal and the server timing signal and a delay offset.

15. The multimedia server module of claim 12 wherein the audio processing module further includes an audio interface module that produces the audio output in a digital audio format from a delayed audio signal produced by the adjustable delay module.

16. The multimedia server module of claim 12 wherein the audio signal includes a digital audio signal and the audio processing module further includes a parser that generates the server timing signal from the digital audio signal.

17. The multimedia server module of claim 12 wherein the audio signal includes an analog audio signal and the audio processing module further includes an analog to digital converter for converting the audio signal into digital audio.

18. The multimedia server module of claim 12 wherein the server timing signal is generated based on a server clock.

19. The multimedia server module of claim 12 wherein the video timing signal is generated based on a time stamp encoded in the encoded video signal by the encoder module.

20. The multimedia server module of claim 11 wherein the encoder module transcodes the at least one video signal.

21. A method for use in multimedia server module, coupleable to a plurality of multimedia sources that produce at least one video signal and an associated audio signal, the method comprising:

encoding the at least one video signal to produce an encoded video signal;

transmitting a server signal that includes the encoded video signal over a wireless communication path;

receiving a client signal from a client module over the wireless communication path;

demodulating the client signal to produce a video timing signal;

generating an audio output from the audio signal having a time delay, wherein the time delay is based on the video timing signal.

22. The method of claim 21 wherein the step of generating an audio output includes generating a delay signal based on the video timing signal and a server timing signal, and generating the time delay based on the delay signal.

23. The method of claim 22 wherein the delay signal is generated based on the difference between the video timing signal and the server timing signal.

24. The method of claim 22 wherein the delay signal is generated based on the difference between the video timing signal and the server timing signal and a delay offset.

25. The method of claim 22 wherein the step of generating an audio output includes generating the audio output in a digital audio format from a delayed audio signal.

26. The method of claim 22 wherein the audio signal includes a digital audio signal and wherein the step of generating an audio output further includes generating the server timing signal from the digital audio signal.

27. The method of claim 22 wherein the audio signal includes an analog audio signal and wherein the step of generating an audio output further includes converting the audio signal into digital audio.

28. The method of claim 22 wherein the server timing signal is generated based on a server clock.

29. The method of claim 22 wherein the video timing signal is generated based on a time stamp encoded in the encoded video signal.

30. The method of claim 22 wherein the step of encoding includes transcoding the at least one video signal.