METHOD AND SYSTEM FOR FREQUENCY COMPENSATION IN AN AUDIO CODEC

• US 20100057472A1
• Filed: 10/09/2008
• Published: 03/04/2010
• Est. Priority Date: 08/26/2008
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Liu, Michael, Zeng, Hanks, Cheng, Taiyi, Kuzhipatt, Radhakrishnan, Kong, Hongwei, Sollenberger, Nelson
• Application Number:
  US12/248,506
• Publication Number:
  US 20100057472A1
• Time in Patent Office: Days
• US Class Current: 704/500
• CPC Class Codes: G10L 19/26 Pre-filtering or post-filtering
• CPC Class Codes: H03H 17/0294 Variable filters; Programmable filters
• CPC Class Codes: H03H 17/04 Recursive filters
• CPC Class Codes: H03H 2017/0488 Direct form II

Abstract

In a method and system for frequency compensation in an audio CODEC, a filter in a hardware audio CODEC may be configured based on power consumption and based on a frequency response of an active output device to which the filter is communicatively coupled. The filter may comprise a plurality of filter stages, which may be, for example, biquads, and the filter may be configured by enabling or disabling one or more of the stages. In this manner, power consumption of the filter may be managed by enabling and/or disabling one or more stages. Configuration of the filter may be performed dynamically depending on whether one or more audio output devices may be active. In this regard, which output device is active and its frequency response may be determined and filter coefficients may be reconfigured upon a change in which output device may be active.

Claims

1. A method for signal processing the method comprising:

in a hardware audio CODEC comprising a filter communicatively coupled to one or more audio output devices;

configuring said filter based on a power consumption of said filter and based on a frequency response of an active one of said one or more audio output devices; and

filtering an audio signal via said configured filter.

2. The method according to claim 1, wherein said filter comprises a plurality of filter stages.

3. The method according to claim 2, wherein each of said filter stages comprises a biquad.

4. The method according to claim 2, comprising configuring said filter by enabling or disabling one or more of said plurality of filter stages.

5. The method according to claim 4, comprising managing power consumption of said filter via said enabling or disabling of said one or more of said plurality of filter stages.

6. The method according to claim 4, comprising dynamically configuring which of said filter stages are enabled and which of said filter stages are disabled depending on whether said one or more audio output devices is active.

7. The method according to claim 1, comprising dynamically configuring coefficients of said filter upon a change in which of said one or more audio output devices is active.

8. The method according to claim 1, comprising determining whether said one or more audio output devices is active.

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

in a hardware audio CODEC comprising a filter communicatively coupled to one or more audio output devices;

configuring said filter based on a power consumption of said filter and based on a frequency response of an active one of said one or more audio output devices; and

filtering an audio signal via said configured filter.

10. The machine-readable storage according to claim 9, wherein said filter comprises a plurality of filter stages.

11. The machine-readable storage according to claim 10, wherein each of said filter stages comprises a biquad.

12. The machine-readable storage according to claim 10, wherein said at least one code section comprises code for configuring said filter by enabling or disabling one or more of said plurality of filter stages.

13. The machine-readable storage according to claim 12, wherein said at least one code section comprises code for managing power consumption of said filter via said enabling or disabling of said one or more of said plurality of filter stages.

14. The machine-readable storage according to claim 12, wherein said at least one code section comprises code for dynamically configuring which of said filter stages are enabled and which of said filter stages are disabled depending on whether said one or more audio output devices is active.

15. The machine-readable storage according to claim 9, wherein said at least one code section comprises code for dynamically configuring coefficients of said filter upon a change in which of said one or more audio output devices is active.

16. The machine-readable storage according to claim 9, wherein said at least one code section comprises code for determining whether said one or more audio output devices is active.

17. A system for signal processing, the system comprising:

one or more circuits for use in a hardware audio CODEC, said one or more circuits comprising a filter communicatively coupled to one or more audio output devices, wherein said one or more circuits are operable to;

configure said filter based on a power consumption of said filter and based on a frequency response of an active one of said one or more audio output devices; and

filter an audio signal via said configured filter.

18. The system according to claim 17, wherein said filter comprises a plurality of filter stages.

19. The system according to claim 18, wherein each of said filter stages comprises a biquad.

20. The system according to claim 18, wherein said one or more circuits are operable to configure said filter by enabling or disabling one or more of said plurality of filter stages.

21. The system according to claim 20, wherein said one or more circuits are operable to manage power consumption of said filter via said enabling or disabling of said one or more of said plurality of filter stages.

22. The system according to claim 20, wherein said one or more circuits are operable to dynamically configure which of said filter stages are enabled and which of said filter stages are disabled depending on whether said one or more audio output devices is active.

23. The system according to claim 17, wherein said one or more circuits are operable to dynamically configure coefficients of said filter upon a change in which of said one or more audio output devices is active.

24. The system according to claim 17, wherein said one or more circuits are operable to determine whether said one or more audio output devices is active.