Signal processing method, signal processing device, and signal processing program

Patent metadata

Field	Value
Publication number	US-10453471-B2
Application number	US-201615056878-A
Country	US
Kind code	B2
Filing date	Feb 29, 2016
Priority date	Nov 8, 2004
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

A double-talk detecting method including estimating a noise contained in a mixed signal containing at least an echo, a near-end signal and a noise to determine an estimated noise; and detecting a presence of a near-end signal contained in said mixed signal using said estimated noise.

First claim

The invention claimed is:

1. A double-talk detecting method using a reference signal transmitted from a far-end and a mixed signal containing at least an echo, a near-end signal, and an environmental noise at the near end, comprising:
estimating said echo to determine an estimated echo;
estimating said environmental noise to determine an estimated environmental noise;
calculating similarity between the estimated echo modified by said estimated environmental noise and the mixed signal; and
detecting presence of the near-end signal using said similarity to modify said estimated echo.

2. The double-talk detecting method as claimed in claim 1 ,
wherein the presence of the near-end signal is detected by using similarity between the estimated echo modified by the estimated noise and the mixed signal.

3. The double-talk detecting method as claimed in claim 1 ,
wherein the presence of the near-end signal is expressed by a reliability coefficient.

4. The double-talk detecting method as claimed in claim 1 ,
wherein the presence of the near-end signal is used in the estimating the noise.

5. The double-talk detecting method as claimed in claim 1 ,
wherein the presence of the near-end signal is detected by a first detection method and a second detection method to obtain a first detection result and a second detection result, respectively, and either the first detection result or the second detection result is selected as a final detection result.

6. The double-talk detecting method as claimed in claim 1 ,
wherein the presence of the near-end signal is detected by a first detection method and a second detection method to obtain a first detection result and a second detection result, respectively; and
the first detection result and the second detection result are integrated into a final detection result.

7. The double-talk detecting method as claimed in claim 1 ,
wherein the estimated noise is differentiated from a pseudo echo, and
wherein the near-end signal contained in said mixed signal is estimated using said estimated noise.

8. A double-talk detector, using a mixed signal containing at least an echo, a near-end signal, and an environmental noise at the near end, comprising:
an adaptive filter for estimating said echo to determine an estimated echo;
an environmental-noise estimating circuit for estimating said environmental noise to determine an estimated environmental noise; and
a double-talk detecting circuit for calculating similarity between the estimated echo modified by said estimated environmental noise and the mixed signal and determining presence of the near-end signal using said similarity to modify said estimated echo.

9. The double-talk detector as claimed in claim 8 ,
wherein said double-talk detecting circuit detects the presence of the near-end signal by using similarity between the estimated echo modified by the estimated noise and the mixed signal.

10. The double-talk detector as claimed in claim 8 ,
wherein said double-talk detecting circuit provides the presence of the near-end signal by a reliability coefficient.

11. The double-talk detector as claimed in claim 8 ,
wherein said noise estimating circuit uses the presence of the near-end signal to estimate the noise.

12. The double-talk detector as claimed in claim 8 ,
wherein said double-talk detecting circuit further comprises:
a first detecting circuit and a second detecting circuit to obtain a first detection result and a second detection result, respectively; and

selects either the first detection result or the second detection result as a final detection result.

13. The double-talk detector as claimed in claim 8 ,
wherein said double-talk detecting circuit further comprises:
a first detecting circuit and a second detecting circuit to obtain a first detection result and a second detection result, respectively; and

integrates the first detection result and the second detection result into a final detection result.

14. The double-talk detecting method as claimed in claim 1 ,
wherein the estimated noise substantially approximates the noise and a pseudo echo substantially approximates the echo.

15. A non-transitory computer-readable storage medium storing a program using a reference signal transmitted from a far-end and a mixed signal containing at least an echo, a near-end signal, and an environmental noise at the near-end, the program causing a computer to perform:
estimating said echo to determine an estimated echo;
estimating said environmental noise to determine an estimated environmental noise;
calculating similarity between the estimated echo modified by said estimated environmental noise and the mixed signal; and
detecting presence of the near-end signal using said similarity to modify the estimated echo.

16. The non-transitory computer-readable storage medium as claimed in claim 15 ,
wherein the presence of the near-end signal is detected by using similarity between the estimated echo modified by the estimated noise and the mixed signal.

17. The non-transitory computer-readable storage medium as claimed in claim 15 ,
wherein the presence of the near-end signal is expressed by a reliability coefficient.

18. The non-transitory computer-readable storage medium as claimed in claim 15 ,
wherein the presence of the near-end signal is used in the estimating the noise.

19. The non-transitory computer-readable storage medium as claimed in claim 15 ,
wherein the presence of the near-end signal is detected by a first detection method and a second detection method to obtain a first detection result and a second detection result, respectively, and either the first detection result or the second detection result is selected as a final detection result.

20. The non-transitory computer-readable storage medium as claimed in claim 15 ,
wherein the presence of the near-end signal is detected by a first detection method and a second detection method to obtain a first detection result and a second detection result, respectively; and
the first detection result and the second detection result are integrated into a final detection result.

Assignees

• Nec Corp

Inventors

• Sugiyama Akihiko

Classifications

• G10L2021/02082

  the noise being echo, reverberation of the speech · CPC title

• G10L2021/02163

  Only one microphone · CPC title

• H04R2410/05

  Noise reduction with a separate noise microphone · CPC title

• H04M9/082 Primary

  using echo cancellers (echo cancellers per se H04B3/23) · CPC title

• H04B3/234

  using double talk detection · CPC title