Dedicated echo canceler for a workstation

• US 6,594,688 B2
• Filed: 06/11/2001
• Issued: 07/15/2003
• Est. Priority Date: 10/01/1993
• Status: Expired due to Fees

• Current Assignee: Pragmatus AV LLC (Pragmatus, LLC)
• Original Assignee: Collaboration Properties Incorporated
• Inventors: Lantz, Keith A., Burns, Emmett R., Lauwers, J. Chris, Burnett, Gerald J., Ludwig, Lester F.
• Primary Examiner(s): Dinh, Dung C.
• Application Number:
  US09/879,460
• Publication Number:
  US 20010044826A1
• Time in Patent Office: 764 Days
• Field of Search: 709/204, 709/205, 709/206, 370/286, 370/287, 370/288, 370/289, 370/290, 370/291, 370/292, 379/406-1-4
• US Class Current: 709/204
• CPC Class Codes: G06F 15/16 Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs coordinating program control therefor G06F9/52; in regulating and control system G05B
• CPC Class Codes: G06Q 10/10 Office automation; Time management
• CPC Class Codes: H04L 12/1818 Conference organisation arrangements, e.g. handling schedules, setting up parameters needed by nodes to attend a conference, booking network resources, notifying involved parties
• CPC Class Codes: Y10S 707/99933 Query processing, i.e. searching
• CPC Class Codes: Y10S 707/99953 Recoverability

Abstract

A multimedia collaboration system that integrates separate real-time and asynchronous networks—the former for real-time audio and video, and the latter for control signals and textual, graphical and other data—in a manner that is interoperable across different computer and network operating system platforms and which closely approximates the experience of face-to-face collaboration, while liberating the participants from the limitations of time and distance. These capabilities are achieved by exploiting a variety of hardware, software and networking technologies in a manner that preserves the quality and integrity of audio/video/data and other multimedia information, even after wide area transmission, and at a significantly reduced networking cost as compared to what would be required by presently known approaches. The system architecture is readily scalable to the largest enterprise network environments. It accommodates differing levels of collaborative capabilities available to individual users and permits high-quality audio and video capabilities to be readily superimposed onto existing personal computers and workstations and their interconnecting LANs and WANs. In a particular preferred embodiment, a plurality of geographically dispersed multimedia LANs are interconnected by a WAN. The demands made on the WAN are significantly reduced by employing multi-hopping techniques, including dynamically avoiding the unnecessary decompression of data at intermediate hops, and exploiting video mosaicing, cut-and-paste and audio mixing technologies so that significantly fewer wide area transmission paths are required while maintaining the high quality of the transmitted audio/video.

Claims

1. A teleconferencing system for conducting a teleconference among a plurality of participants, each of said plurality of participants having a desktop workstation comprising video capture and display and audio capture and reproduction capabilities, said system comprising:

a data path in communication with one or more of said desktop workstations so that data can be shared among each of said plurality of participants;

an audio/video path in communication with one or more of said desktop workstations so that audio and video signals can be shared among each of said plurality of participants; and

at least one adaptive acoustical echo canceler in communication with at least one of said desktop workstations, wherein said at least one adaptive acoustical echo canceler is configured to reduce echo during reproduction of audio signals at said at least one of said desktop workstations.

2. The system according to claim 1, wherein said audio/video path comprises Unshielded Twisted Pair (UTP) wiring.

3. The system according to claim 2, wherein said data path and said audio/video path comprise a single pair of Unshielded Twisted Pair (UTP) wires, wherein said data and said audio and video signals are multiplexed onto said single pair of UTP wires.

4. The system according to claim 2, wherein said audio/video path is configured to provide TV quality video signals.

5. The system according to claim 4, wherein said audio/video path comprises an audio/video transceiver to provide said TV quality video signals.

6. The system according to claim 1, wherein said plurality of participants comprises a first participant and a remaining plurality of participants;

said system further comprising;

a video mosaic generator in communication with said audio/video path that combines captured video images of said first participant and said remaining plurality of participants into a video mosaic image that is displayed at said first participant'"'"'s desktop workstation.

7. The system according to claim 6, further comprising:

an audio summer, in communication with said audio/video path, that receives captured audio of said first participant and said remaining plurality of participants and is configured to combine said received captured audio of the remaining plurality of participants into an audio sum that can be reproduced at said first participant'"'"'s workstation.

8. The system according to claim 7, wherein said first participant'"'"'s desktop workstation comprises a plurality of speakers;

said system further comprising;

an audio control configured to control said audio sum reproduction at said first participant'"'"'s desktop workstation by reproducing audio from each of said remaining plurality of participants at each of said plurality of speakers based on a position of said captured video image of each of said remaining plurality of participants in said video mosaic image reproduced at said first participant'"'"'s desktop workstation.

9. The system according to claim 8, wherein said first participant'"'"'s desktop workstation comprises a plurality of adaptive acoustical echo cancelers.

10. The system according to claim 1, further comprising:

a wireless communication link between said at least one of said desktop workstations and said audio/video path.

11. The system according to claim 9, wherein said wireless communication link is configured to accept signals transmitted by cellular telephone channels.

12. The system according to claim 1, further comprising:

a wireless communication link between said at least one of said desktop workstations and said data path.

13. The system according to claim 12, wherein said wireless communication link is configured to accept signals transmitted by cellular telephone channels.

14. The system according to claim 1, further comprising:

an add-on box in communication with at least one of said desktop workstations that provides a communication link between said at least one of said desktop workstations and said audio/video path.

15. The system according to claim 14, further comprising:

a microphone in communication with said add-on box, wherein said microphone captures and transmits outgoing audio signals to said audio/video path.

16. The system according to claim 15, further comprising:

at least one speaker in communication with said add-on box, wherein said at least one speaker presents incoming audio signals from said audio/video path.

17. The system according to claim 16, wherein said at least one adaptive acoustical echo canceler is integrated within said add-on box.

18. The system according to claim 17, wherein said microphone and said at least one speaker are integrated into a handset.

19. The system according to claim 17, wherein said microphone and said at least one speaker are integrated into a headset.

20. The system according to claim 14, further comprising:

an audio/video transceiver that provides TV quality video signals, wherein said audio/video transceiver is integrated within said add-on box.

21. The system according to claim 1, further comprising:

an add-in card in communication with at least one of said desktop workstations that provides a communication link between said at least one of said desktop workstations and said audio/video path.

22. The system according to claim 21, further comprising:

a microphone in communication with said add-in card, wherein said microphone captures and transmits outgoing audio signals to said audio/video path.

23. The system according to claim 22, further comprising:

at least one speaker in communication with said add-in card, wherein said at least one speaker presents incoming audio signals from said audio/video path.

24. The system according to claim 23, wherein said at least one adaptive acoustical echo canceler is integrated within said add-in card.

25. The system according to claim 24, wherein said microphone and said at least one speaker are integrated into a handset.

26. The system according to claim 24, wherein said microphone and said at least one speaker are integrated into a headset.

27. The system according to claim 21, further comprising:

an audio/video transceiver that provides TV quality video signals, wherein said audio/video transceiver is integrated within said add-in card.

28. A teleconferencing system for conducting a teleconference among a plurality of participants, each of said plurality of participants having a desktop workstation comprising an attachable display monitor providing video display, wherein said desktop workstation is provided with audio capture and reproduction capabilities, said system comprising:

an audio/video transceiver in communication with at least one of said plurality of desktop workstations so that audio and video signals can be shared among said plurality of participants; and

at least one adaptive acoustical echo canceler in communication with said at least one of said plurality of desktop workstations, wherein said at least one adaptive acoustical echo canceler is configured to reduce echo during reproduction of audio signals at said at least one of said plurality of desktop workstations.

29. The system according to claim 28, wherein said audio/video transceiver is in communication with an analog network, and wherein said audio/video transceiver is configured to provide said audio and video signals over said analog network.

30. The system according to claim 28, wherein said audio/video transceiver is in communication with a digital network, wherein said audio/video transceiver is configured to provide said audio and video signals over said digital network.

31. The system according to claim 28, wherein said audio/video transceiver is in communication with an unshielded twisted pair (UTP) network, wherein said audio/video transceiver is configured to provide said audio and video signals over said UTP network.

32. The system according to claim 28, further comprising:

an add-on peripheral box; and

wherein said audio/video transceiver and said at least one adaptive acoustical echo canceler are integrated into said add-on peripheral box.

33. The system according to claim 32, wherein a connection port is integrated into said at least one of said plurality of desktop workstations;

and

wherein said add-on peripheral box connects to said at least one of said plurality of desktop workstations via said connection port.

34. The system according to claim 28, further comprising:

an add-in card; and

wherein said audio/video transceiver and said at least one adaptive acoustical echo canceler are integrated into said add-in card, and wherein said add-in card is insertable into a computer.

35. The system according to claim 28, wherein said at least one adaptive acoustical echo canceler is configured to reduce echo during reproduction of stereo audio signals at said at least one of said plurality of desktop workstations.

36. A method for conducting a teleconference among a plurality of participants, each of said plurality of participants having a desktop workstation comprising an attachable display monitor providing video display, wherein the desktop workstation provides audio capture and reproduction, said method comprising:

placing an audio/video transceiver and at least one adaptive acoustical echo canceler in communication with at least one of said plurality of desktop workstations;

sharing audio and video signals among said plurality of participants during said teleconference, wherein said sharing utilizes said audio/video transceiver; and

reducing echo during a reproduction of audio signals at said least one of said plurality of desktop workstations, wherein said reducing utilizes said at least one adaptive acoustical echo canceler.

37. The method according to claim 36, said method further comprising:

placing said audio/video transceiver in communication with an analog network, wherein said audio/video transceiver is configured to provide said audio and video signals over said analog network.

38. The method according to claim 36, said method further comprising:

placing said audio/video transceiver in communication with a digital network, wherein said audio/video transceiver is configured to provide said audio and video signals over said digital network.

39. The method according to claim 36, said method further comprising:

placing said audio/video transceiver in communication with an unshielded twisted pair (UTP) network, wherein said audio/video transceiver is configured to provide said audio and video signals over said UTP network.

40. The method according to claim 36, said method further comprising:

integrating said audio/video transceiver and said at least one adaptive acoustical echo canceler into an add-on peripheral box.

41. The method according to claim 40, said method further comprising:

connecting said add-on peripheral box to said at least one of said plurality of desktop workstations via a connection port, wherein said connection port is provided at said at least one of said plurality of desktop workstations.

42. The method according to claim 36, said method further comprising:

integrating said audio/video transceiver and said at least one adaptive acoustical echo canceler into an add-in card, wherein said add-in card is insertable into a computer.

43. The method according to claim 36, wherein said at least one adaptive acoustical echo canceler is configured to reduce echo during reproduction of stereo audio signals at said at least one of said desktop workstations.

44. An audio/video conferencing device, said device comprising:

a unitary housing having

at least one speaker for audio reproduction;

at least one microphone for audio capture;

at least one adaptive acoustical echo canceler; and

wherein said at least one speaker and said at least one microphone are integrated into said unitary housing in a fixed spatial relationship with respect to each other and cooperate with said at least one adaptive acoustic echo canceler to reduce echo during said audio reproduction.

45. The device according to claim 44, further comprising:

a video display for video image reproduction, wherein said video display is integrated into said unitary housing.

46. The device according to claim 44, wherein said at least one adaptive acoustical echo canceler is configured to reduce echo during reproduction of stereo audio signals at said at least one speaker.

47. A method for using an audio/video conferencing device, said method comprising:

providing a unitary housing having

at least one speaker;

at least one microphone;

at least one adaptive acoustical echo canceler;

reproducing audio at said at least one speaker; and

integrating said at least one speaker and said at least one microphone into said unitary housing in a fixed spatial relationship with respect to each other and cooperate with said at least one adaptive acoustic echo canceler to reduce echo during said audio reproduction.

48. The method according to claim 47, further comprising:

putting a video display into said unitary housing.

49. The method according to claim 47, wherein said at least one adaptive acoustical echo canceler is configured to reduce echo during reproduction of stereo audio signals at said at least one speaker.

50. A teleconferencing device for engaging in a teleconference, said device comprising:

at least one audio reproduction device;

at least two echo cancelers that reduce echo during a reproduction of audio signals at said at least one audio reproduction device, wherein said at least two echo cancelers are configured to process audio signals comprising multiple audio channels; and

wherein a perceived spatial location of said reproduced audio signals is determined by a metaphor with spatial attributes.

51. The device according to claim 50, wherein said teleconference comprises said audio signals and video signals.

52. The device according to claim 51, wherein said perceived spatial location of said reproduced audio signals exists during a reproduction of said video signals.

53. The device according to claim 50, further comprising:

an add-in card; and

wherein said at least two echo cancelers are integrated into said add-in card, and wherein said add-in card is insertable into a computer.

54. A method for using a teleconferencing device to engage in a teleconference, said method comprising:

receiving audio signals at said teleconferencing device during said teleconference, wherein said audio signals comprise multiple audio channels;

processing said audio signals with at least two echo cancelers, wherein said processing reduces echo during a subsequent audio signal reproduction; and

reproducing said audio signals at an audio reproduction device, wherein a perceived spatial location of said reproduced audio signals is determined by a metaphor with spatial attributes.

55. The method according to claim 54, wherein said teleconference comprises said audio signals and video signals.

56. The method according to claim 55, wherein said perceived spatial location of said reproduced audio signals exists during a reproduction of said video signals.

57. The method according to claim 54, said method further comprising:

integrating said at least two echo cancelers into an add-in card, wherein said add-in card is insertable into a computer.