Matching reverberation in teleconferencing environments

Patent metadata

Field	Value
Publication number	US-9749474-B2
Application number	US-201615208379-A
Country	US
Kind code	B2
Filing date	Jul 12, 2016
Priority date	Sep 27, 2013
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A system and method of matching reverberation in teleconferencing environments. When the two ends of a conversation are in environments with differing reverberations, the method filters the reverberation so that when both signals are output at the near end (e.g., the audio signal from the far end and the sidetone from the near end), the reverberations match. In this manner, the user does not perceive an annoying difference in reverberations, and the user experience is improved.

First claim

What is claimed is:

1. A method of matching acoustics in a telecommunications system, comprising:
receiving, in a near end environment, a first audio signal from a first far end environment and a second audio signal from a second far end environment;
determining first acoustic parameters for the first audio signal and second acoustic parameters for the second audio signal, wherein the first acoustic parameters correspond to the first far end environment for the first audio signal, and the second acoustic parameters correspond to the second far end environment for the second audio signal;
performing filtering on the first audio signal and the second audio signal in order to match the first acoustic parameters and the second acoustic parameters to reference acoustic parameters of a reference environment; and
outputting in the near end environment the first audio signal having been filtered and the second audio signal having been filtered,
wherein the reference environment corresponds to one of the first far end environment, the second far end environment, the near end environment, a low reverberation environment, and a medium reverberation environment.

2. The method of claim 1 , wherein the near end environment includes a headset that outputs the first audio signal having been filtered and the second audio signal having been filtered.

3. The method of claim 1 , wherein the near end environment includes a speakerphone that outputs the first audio signal having been filtered and the second audio signal having been filtered.

4. The method of claim 1 , wherein the first far end environment includes a headset.

5. The method of claim 1 , wherein the second far end environment includes a speakerphone.

6. The method of claim 1 , wherein determining acoustic parameters comprises:
detecting a reverberation in the first audio signal; and
generating an impulse response function that models the reverberation in the first audio signal.

7. The method of claim 1 , wherein determining first acoustic parameters comprises:
receiving metadata that is descriptive of an acoustic environment of the first far end environment; and
generating, from the metadata, an impulse response function that models a reverberation in the acoustic environment of the first far end environment.

8. The method of claim 1 , wherein performing filtering comprises performing filtering on the first audio signal according to an impulse response function that models a reverberation in the first audio signal.

9. The method of claim 1 , wherein performing filtering comprises performing filtering on the first audio signal according to an impulse response function that models a reverberation in the second audio signal.

10. The method of claim 1 , further comprising:
performing location cue processing on the first audio signal to generate a left signal and a right signal having location cues;
adding the filtered signal to the left signal and to the right signal to generate a left combined signal and a right combined signal; and
performing reverberation filtering on the left combined signal and the right combined signal, before outputting the first audio signal having been filtered.

11. The method of claim 1 , further comprising:
receiving, in the near end environment, a third audio signal from the near end environment;
determining third acoustic parameters for the third audio signal, wherein the third acoustic parameters correspond to the near end environment for the third audio signal;
performing filtering on the third audio signal in order to match the third acoustic parameters to the reference acoustic parameters; and
outputting in the near end environment the third audio signal having been filtered.

12. The method of claim 1 , further comprising:
receiving a user selection of the reference acoustic parameters.

13. The method of claim 12 , wherein the user selection increments or decrements from a first set of the reference acoustic parameters to a second set of the reference acoustic parameters.

14. The method of claim 12 , wherein the user selection decrements the reference acoustic parameters to a dry environment.

15. An apparatus for matching acoustics in a telecommunications system, comprising:
a first circuit that is configured to receive, in a near end environment, a first audio signal from a first far end environment and a second audio signal from a second far end environment;
a second circuit that is configured to determine first acoustic parameters for the first audio signal and second acoustic parameters for the second audio signal, wherein the first acoustic parameters correspond to the first far end environment for the first audio signal, and the second acoustic parameters correspond to the second far end environment for the second audio signal;
a first filter circuit that is configured to perform filtering on the first audio signal in order to match the first acoustic parameters to reference acoustic parameters of a reference environment;
a second filter circuit that is configured to perform filtering on the second audio signal in order to match the second acoustic parameters to the reference acoustic parameters; and
an output circuit that is configured to output in the near end environment the first audio signal having been filtered and the second audio signal having been filtered,
wherein the reference environment corresponds to one of the first far end environment, the second far end environment, the near end environment, a low reverberation environment, and a medium reverberation environment.

16. The apparatus of claim 15 , wherein the apparatus comprises a headset that includes the output circuit, and wherein the output circuit comprises a speaker.

17. The apparatus of claim 15 , wherein the apparatus comprises a speakerphone that includes the output circuit, and wherein the output circuit comprises a speaker.

18. The apparatus of claim 15 , wherein the apparatus comprises:
a computer; and
a headset that includes the output circuit, wherein the output circuit comprises a speaker.

19. The apparatus of claim 15 , further comprising:
a third circuit that is configured to receive, in the near end environment, a third audio signal from the near end environment;
a fourth circuit that is configured to determine third acoustic parameters for the third audio signal, wherein the third acoustic parameters correspond to the near end environment for the third audio signal; and
a third filter circuit that is configured to perform filtering on the third audio signal in order to match the third acoustic parameters to the reference acoustic parameters,
wherein the output circuit is further configured to output in the near end environment the third audio signal having been filtered.

20. A computer program tangibly embodied on a non-transitory computer readable medium that is configured to control a computer, including a processor and a memory, to execute processing for matching acoustics in a telecommunications system, the computer program comprising instructions for:
receiving, in a near end environment, a first audio signal from a first far end environment and a second audio signal from a second far end environment;
determining first acoustic parameters for the first audio signal and second acoustic parameters for the second audio signal, wherein the first acoustic parameters correspond to the first far end environment for the first audio signal, and the second acoustic parameters correspond to the second far end environment f

Assignees

• Dolby Laboratories Licensing Corp

Inventors

• Kim Doh-Suk
• Spittle Gary

Classifications

• H04M1/6033

  for providing handsfree use or a loudspeaker mode in telephone sets (arrangements for preventing acoustic echo H04M9/08) · CPC title

• H04R27/00

  Public address systems (circuits for preventing acoustic reaction H04R3/02; circuits for distributing signals to loudspeakers H04R3/12; {monitoring or testing arrangements for public address systems H04R29/007}; amplifiers H03F) · CPC title

• H04S7/306

  For headphones · CPC title

• H04S2400/01

  Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved · CPC title

• H04R3/04

  for correcting frequency response · CPC title