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

• US 7,987,095 B2
• Filed: 02/07/2007
• Issued: 07/26/2011
• 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: Thyssen, Jes, LeBlanc, Wilfrid
• Primary Examiner(s): Smits; Talivaldis Ivars
• Assistant Examiner(s): ROBERTS, SHAUN A
• Application Number:
  US11/672,120
• Publication Number:
  US 20080189116A1
• Time in Patent Office: 1,630 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:

in a wideband mode of operation, subband processing of each of a lowband component and a highband component of a received input signal;

in a narrowband mode of operation, processing said lowband component of said received input signal; and

dynamically switching between said wideband mode of operation and said narrowband mode of operation.

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

3. The method according to claim 1, wherein said received input signal is a wideband signal.

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

5. The method according to claim 3, comprising processing said lowband component and said highband component of said received input signal independently in said wideband mode of operation.

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 dynamically switching between said wideband mode of operation and said narrowband mode of operation during a call transfer operation.

8. The method according to claim 1, comprising combining said lowband component and said highband component to generate an output signal.

9. The method according to claim 1, comprising decoding each of said lowband component and said highband component of said received input signal.

10. The method according to claim 1, comprising encoding each of said lowband component and said highband component of said received input signal.

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

one or more circuits that are operable to, in a wideband mode of operation, subband process each of a lowband component and a highband component of a received input signal;

said one or more circuits are operable to, in a narrowband mode of operation, process said lowband component of said received input signal; and

said one or more circuits are operable to dynamically switch between said wideband mode of operation and said narrowband mode of operation.

12. The system according to claim 11, wherein said one or more circuits are operable to reduce an echo associated with said received input signal.

13. The system according to claim 11, wherein said received input signal is a wideband signal.

14. The system according to claim 13, 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.

15. The system according to claim 14, wherein said one or more circuits are operable to process said lowband component and said highband component of said received input signal independently in said wideband mode of operation.

16. The system according to claim 11, wherein said one or more circuits are operable to suppress a noise associated with said input signal.

17. The system according to claim 11, wherein said one or more circuits are operable to dynamically switch between said wideband mode of operation and said narrowband mode of operation during a call transfer operation.

18. The system according to claim 11, 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 11, wherein said one or more circuits are operable to decode each of said lowband component and said highband component of said received input signal.

20. The system according to claim 11, wherein said one or more circuits are operable to encode each of said lowband component and said highband component of said received input signal.