Method and system for dual mode subband acoustic echo canceller with integrated noise suppression

• US 8,180,648 B2
• Filed: 07/25/2011
• Issued: 05/15/2012
• Est. Priority Date: 09/27/2002
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: LeBlanc, Wilfrid, Thyssen, Jes
• Primary Examiner(s): Smits, Talivaldis Ivars
• Assistant Examiner(s): ROBERTS, SHAUN A
• Application Number:
  US13/189,928
• Publication Number:
  US 20110282676A1
• Time in Patent Office: 295 Days
• Field of Search: 704/500, 704/501, 704/219, 381/66
• US Class Current: 704/500
• CPC Class Codes: G10L 2021/02082 the noise being echo, reverberation of the speech
• CPC Class Codes: G10L 25/18 the extracted parameters being spectral information of each sub-band
• CPC Class Codes: H04M 3/002 Applications of echo suppressors or cancellers in telephonic connections in two-way loud-speaking telephone systems H04M9/08, echo suppressors or cancellers per se H04B3/20
• CPC Class Codes: H04M 9/082 using echo cancellers echo cancellers per se H04B3/23

Abstract

Certain aspects of a method and system for a dual mode subband acoustic echo canceller with integrated noise suppression may include splitting an input signal into a lowband component and a highband component. The subbands of each of the lowband component and the highband component may be processed in order to reduce an echo associated with the input signal and to suppress the noise associated with the input signal.

Claims

1. A method for processing signals, the method comprising:

switching between a wideband mode of operation and a narrowband mode of operation, wherein only a lowband component of a received input signal is processed in said narrowband mode of operation.

2. The method according to claim 1, comprising subband processing of said lowband component and a highband component of said received input signal in said wideband mode of operation.

3. The method according to claim 2, comprising splitting said received input signal into said lowband component and said highband component in said wideband mode of operation.

4. The method according to claim 2, comprising combining said lowband component and said highband component to generate an output signal.

5. The method according to claim 2, comprising encoding and/or decoding each of said lowband component and said highband component of said received input signal.

6. The method according to claim 1, comprising suppressing a noise associated with said received input signal.

7. The method according to claim 1, comprising reducing an echo associated with said received input signal.

8. A non-transitory machine-readable storage medium having stored thereon, a computer program having at least one code section for processing signals, the at least one code section being executable by a machine for causing the machine to perform steps comprising:

switching between a wideband mode of operation and a narrowband mode of operation, wherein only a lowband component of a received input signal is processed in said narrowband mode of operation.

9. The non-transitory machine-readable storage medium according to claim 8, wherein said at least one code section comprises code for subband processing of said lowband component and a highband component of said received input signal in said wideband mode of operation.

10. The non-transitory machine-readable storage medium according to claim 9, wherein said at least one code section comprises code for splitting said received input signal into said lowband component and said highband component in said wideband mode of operation.

11. The non-transitory machine-readable storage medium according to claim 9, wherein said at least one code section comprises code for combining said lowband component and said highband component to generate an output signal.

12. The non-transitory machine-readable storage medium according to claim 9, wherein said at least one code section comprises code for encoding and/or decoding each of said lowband component and said highband component of said received input signal.

13. The non-transitory machine-readable storage medium according to claim 8, wherein said at least one code section comprises code for suppressing a noise associated with said received input signal.

14. The non-transitory machine-readable storage medium according to claim 8, wherein said at least one code section comprises code for reducing an echo associated with said received input signal.

15. A system for processing signals, the system comprising:

one or more circuits that are operable to switch between a wideband mode of operation and a narrowband mode of operation, wherein only a lowband component of a received input signal is processed in said narrowband mode of operation.

16. The system according to claim 15, wherein said one or more circuits are operable to subband process said lowband component and a highband component of said received input signal in said wideband mode of operation.

17. The system according to claim 16, wherein said one or more circuits are operable to split said received input signal into said lowband component and said highband component in said wideband mode of operation.

18. The system according to claim 16, wherein said one or more circuits are operable to combine said lowband component and said highband component to generate an output signal.

19. The system according to claim 16, wherein said one or more circuits are operable to encode and/or decode each of said lowband component and said highband component of said received input signal.

20. The system according to claim 15, wherein said one or more circuits are operable to suppress a noise associated with said received input signal.

21. The system according to claim 15, wherein said one or more circuits are operable to reduce an echo associated with said received input signal.

22. A system for processing signals, the system comprising:

means for processing a received input signal; and

means for switching a mode of operation for said means for processing between a wideband mode of operation and a narrowband mode of operation, wherein only a lowband component of said received input signal is processed in said narrowband mode of operation.

23. The system according to claim 22, wherein said means for processing is configured to subband process said lowband component and a highband component of said received input signal in said wideband mode of operation.

24. The system according to claim 23, wherein said means for processing is configured to split said received input signal into said lowband component and said highband component in said wideband mode of operation.

25. The system according to claim 23, wherein said means for processing is configured to combine said lowband component and said highband component to generate an output signal.

26. The system according to claim 23, wherein said means for processing is configured to encode and/or decode each of said lowband component and said highband component of said received input signal.

27. The system according to claim 22, wherein said means for processing is configured to suppress a noise associated with said received input signal.

28. The system according to claim 22, wherein said means for processing is configured to reduce an echo associated with said received input signal.