Adaptive speaker compensation system for a multimedia computer system

• US 6,674,864 B1
• Filed: 12/23/1997
• Issued: 01/06/2004
• Est. Priority Date: 12/23/1997
• Status: Expired due to Term

• Current Assignee: ATI Technologies ULC (Advanced Micro Devices, Inc.)
• Original Assignee: ATI Technologies ULC (Advanced Micro Devices, Inc.)
• Inventors: Kitamura, John S.
• Primary Examiner(s): Harvey, Minsun Oh
• Assistant Examiner(s): Grier, Laura A.
• Application Number:
  US08/997,031
• Time in Patent Office: 2,205 Days
• Field of Search: 381/103, 381/96, 381/98, 381/59, 381/100, 381/99, 381/55, 381/949
• US Class Current: 381/103
• CPC Class Codes: H03G 5/005 of digital signals
• CPC Class Codes: H04R 29/001 for loudspeakers H04R29/007 takes precedence
• CPC Class Codes: H04R 3/14 Cross-over networks

Abstract

An adaptive speaker compensation system and method, such as for use in a multimedia computer, stores speaker response filter coefficients for each speaker and adaptively compensates received audio for non-linear speaker characteristics based on the stored speaker response filter coefficients. The speaker response filter coefficients preferably represent an inverse response of a speaker response curve for each speaker in the audio system. Preferably a library memory containing prestored speaker characteristic data, such as the speaker response filter coefficients, is selectively accessed by the adaptive speaker compensation system to download the speaker response filter coefficients based on identification of a speaker type and channel for which the speaker is being used.

Claims

1. An adaptive speaker compensation system comprising:

means for storing speaker response filter coefficients;

means, operatively coupled to the means for storing, for adaptively compensating received audio for non-linear speaker characteristics based on the stored speaker response filter coefficients;

a remotely accessible library memory means for storing speaker characteristic data;

said means for adaptively compensating includes means, operatively coupled to the library memory means, for modifying filter configurations based on speaker characteristic data obtained from the library memory means;

said library memory includes audio channel selection data and speaker type data to facilitate adaptive selection of speaker characteristic data on a per speaker basis; and

said speaker characteristic data includes finite impulse response filter coefficients; and

,

said means for adaptively compensating, remotely accesses the library memory means to obtain the finite impulse response for filter coefficients for storage in the means for storing as speaker response filter coefficients.

2. A method for adaptive speaker compensation comprising the steps of:

storing speaker response filter coefficients for a plurality of speakers, each representing an inverse response of a speaker response curve for said plurality of speakers, on a per speaker basis;

adaptively compensating received audio for non-linear speaker characteristics based on the stored speaker response filter coefficients;

storing speaker characteristic data in library memory that includes audio channel selection data and speaker type data to facilitate adaptive selection of speaker characteristic data on a per speaker basis, and

modifying filter configurations based on speaker characteristic data obtained from the library memory.

3. The method of claim 2 wherein adaptively compensating received audio includes adaptively varying filtering for each speaker in response to the stored speaker response filter coefficients.

4. The method of claim 2 wherein adaptively compensating includes providing adaptive crossover filtering to facilitate frequency separation on a per speaker basis.

5. The method of claim 2 wherein the speaker characteristic data includes finite impulse response filter coefficients, the library memory is remotely accessible and adaptively compensating includes remotely accessing the library memory to obtain the finite impulse response filter coefficients for storage as speaker response filter coefficients for storage as speaker response filter coefficients.

6. An adaptive speaker compensation apparatus comprising:

an interface to communicate remotely with an adaptive speaker compensation unit; and

a filter coefficient library for storing audio selection data and speaker type data to facilitate adaptive selection of speaker filter characteristic data on a per speaker basis, said filter coefficient library being comprised of sets of filter coefficients for each speaker type and being remotely located from speakers themselves.

7. The system of claim 6 wherein the speaker characteristic data includes finite impulse response filter coefficients, the library memory is remotely accessible and the means for adaptively compensating remotely accesses the library memory means to obtain the finite impulse response filter coefficients for storage in the means for storing as speaker response filter coefficients.

8. A method of adaptive speaker compensation comprising the steps of:

storing speaker response filter coefficients for a plurality of different speakers in a library memory that includes audio channel selection data and speaker type data to facilitate adaptive selection of speaker characteristic data on a per speaker basis; and

adaptively compensating received audio for non-linear speaker characteristics of each speaker by providing adaptive crossover filtering based on stored speaker response filter characteristics to facilitate frequency separation on a per speaker basis and by modifying filter configurations based on speaker characteristic data obtained from the library memory.

9. The method of claim 8 wherein adaptively compensating received audio includes adaptively varying filtering for each speaker in response to the stored speaker response filter coefficients.

10. The method of claim 8 wherein adaptively compensating received audio includes communicating with library memory containing prestored speaker characteristic data to update compensation filtering in response to changes in speaker types.

11. The method of claim 8 wherein the speaker characteristic data includes finite impulse response filter coefficients, the library memory is remotely accessible and the step of adaptively compensating includes remotely accessing the library memory to obtain the finite impulse response filter coefficients for storage as speaker response filter coefficients.

12. An adaptive speaker compensation system comprising:

library means for storing speaker response filter coefficients for a plurality of speaker types and for storing speaker characteristic data for a plurality of speaker type data to facilitate adaptive selection of speaker characteristic data on a per speaker basis, said library means further storing audio channel selection data and speaker type data; and

means, operatively coupled to the library means for storing, for adaptively compensating received audio for non-linear speaker characteristics based on the stored speaker response filter coefficients, wherein the means for adaptively compensating received audio includes means for communicating with a library memory containing prestored speaker characteristic data to update compensation filtering in response to changes in speaker types and further includes means for modifying filter configurations based on speaker data obtained from the library means.

13. The system of claim 12 wherein the means for adaptively compensating includes means for providing adaptive crossover filtering to facilitate frequency separation on a per speaker basis.

14. The system of claim 12 wherein the means for adaptively compensating received audio includes means for adaptively varying filtering for each speaker in response to the stored speaker response filter coefficients.

15. The system of claim 12 wherein the filter coefficients are sets of filter coefficients for each speaker type.

16. A method of adaptive speaker compensation comprising the steps of:

storing speaker characteristic data in library memory wherein the library memory includes audio channel selection data and speaker type data to facilitate adaptive selection of speaker characteristic data on a per speaker basis;

storing speaker response filter coefficients; and

adaptively compensating received audio for non-linear speaker characteristics based on the stored speaker response filter coefficients wherein compensating includes modifying filter configurations based on speaker characteristic data obtained from the library memory.

17. The method of claim 16 wherein the speaker characteristic data includes finite impulse response filter coefficients, the library memory is remotely accessible and the step of adaptively compensating includes remotely accessing the library memory to obtain the finite impulse response filter coefficients for storage as speaker response filter coefficients.