Distributed acoustic reverberation for audio collaboration

• US 20040205204A1
• Filed: 01/12/2004
• Published: 10/14/2004
• Est. Priority Date: 10/10/2000
• Status: Active Grant

• Current Assignee: Board of Trustees of the Leland Stanford Junior University (Stanford University)
• Original Assignee: Board of Trustees of the Leland Stanford Junior University (Stanford University)
• Inventors: Chafe, Christopher D.
• Granted Patent: US 7,522,734 B2
• Time in Patent Office: Days
• US Class Current: 709/229
• CPC Class Codes: H04L 41/12 Discovery or management of network topologies
• CPC Class Codes: H04L 43/10 Active monitoring, e.g. heartbeat, ping or trace-route
• CPC Class Codes: H04L 43/50 Testing arrangements

Abstract

A distributed acoustic reverberator including a network audio connection between at least two separated locations is provided. When a sound is emitted at one of the locations, the reverberator provides a reverberation signal to that location with a procedure. An algorithm implemented by the distributed reverberator includes such a procedure for each location. The delay of the network connection is an input to the procedures. Thus, a shared and acoustically consistent space including the separated locations is provided. The reverberator may include procedures for providing a reverberation signal to one location responsive to sound at another location.

Claims

1. A method for distributed acoustic reverberation synthesis, the method comprising:

a) establishing a network audio connection between a first location and a second location separated from said first location, said connection having a network delay; and

b) providing a reverberation algorithm including;

i) a first procedure for providing a first reverberation signal to said first location responsive to a first sound at said first location; and

ii) a second procedure for providing a second reverberation signal to said second location responsive to a second sound at said second location;

wherein said network delay is an input to said first and second procedures.

2. The method of claim 1, further comprising establishing at least one additional network audio connection to at least one additional location separated from said first and second locations.

3. The method of claim 2, wherein said reverberation algorithm further includes an additional procedure for providing an additional reverberation signal to one of said additional locations responsive to a sound at said one of said additional locations.

4. The method of claim 3, wherein a delay of said additional network audio connection is an input to said additional procedure.

5. The method of claim 1, wherein said network delay is less than about 50 ms for a round trip between said first and second locations.

6. The method of claim 1, wherein said first and second procedures are substantially the same.

7. The method of claim 1, wherein said first and second procedures are substantially different.

8. The method of claim 1, wherein said reverberation algorithm comprises a Schroeder-style reverberation method including at least one comb filter.

9. The method of claim 8, wherein a delay element of said comb filter includes said network delay.

10. The method of claim 1, wherein said reverberation algorithm comprises a convolutional reverberation method.

11. The method of claim 1, wherein said reverberation algorithm comprises a waveguide reverberation method.

12. The method of claim 1, further comprising establishing at least one additional network audio connection between said first and second locations, whereby a multi-channel audio connection is established between said first and second locations.

13. The method of claim 12, wherein a delay of said additional network audio connection is an input to said reverberation algorithm.

14. The method of claim 1, wherein said first and second procedures are selected to provide acoustic consistency between said first and second locations.

15. The method of claim 1, wherein said reverberation algorithm further includes:

iii) a third procedure for providing a third reverberation signal to said first location responsive to said second sound; and

iv) a fourth procedure for providing a fourth reverberation signal to said second location responsive to said first sound;

wherein said network delay is an input to said third and fourth procedures.

21. The reverberator of claim 1, wherein said first and second procedures are substantially the same.

22. The reverberator of claim 1, wherein said first and second procedures are substantially different.

23. The reverberator of claim 1, wherein said reverberation algorithm comprises a Schroeder-style reverberation method including at least one comb filter.

24. The reverberator of claim 23, wherein a delay element of said comb filter includes said network delay.

16. A distributed acoustic reverberator comprising:

a) a network audio connection between a first location and a second location separated from said first location, said connection having a network delay; and

b) circuitry implementing a reverberation algorithm, the algorithm including;

i) a first procedure for providing a first reverberation signal to said first location responsive to a first sound at said first location; and

ii) a second procedure for providing a second reverberation signal to said second location responsive to a second sound at said second location;

wherein said network delay is an input to said first and second procedures.

17. The reverberator of claim 16, further comprising at least one additional network audio connection to at least one additional location separated from said first and second locations.

18. The reverberator of claim 17, wherein said reverberation algorithm further includes an additional procedure for providing an additional reverberation signal to one of said additional locations responsive to a sound at said one of said additional locations.

19. The reverberator of claim 18, wherein a delay of said additional network audio connection is an input to said additional procedure.

20. The reverberator of claim 16, wherein said network delay is less than about 50 ms for a round trip between said first and second locations.

25. The reverberator of claim 16, wherein said reverberation algorithm comprises a convolutional reverberation method.

26. The reverberator of claim 16, wherein said reverberation algorithm comprises a waveguide reverberation method.

27. The reverberator of claim 16, further comprising at least one additional network audio connection between said first and second locations, whereby a multi-channel audio connection is established between said first and second locations.

28. The reverberator of claim 27, wherein a delay of said additional network audio connection is an input to said reverberation algorithm.

29. The reverberator of claim 16, wherein said first and second procedures are selected to provide acoustic consistency between said first and second locations.

30. The reverberator of claim 16, wherein said reverberation algorithm further includes:

iii) a third procedure for providing a third reverberation signal to said first location responsive to said second sound; and

iv) a fourth procedure for providing a fourth reverberation signal to said second location responsive to said first sound;

wherein said network delay is an input to said third and fourth procedures.