METHOD AND SYSTEM FOR PROCESSING HIGH QUALITY AUDIO IN A HARDWARE AUDIO CODEC FOR AUDIO TRANSMISSION

• US 20100057228A1
• Filed: 10/09/2008
• Published: 03/04/2010
• Est. Priority Date: 06/19/2008
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kong, Hongwei, Sutharsan, Thirunathan
• Granted Patent: US 8,909,361 B2
• Time in Patent Office: Days
• US Class Current: 700/94
• CPC Class Codes: G10L 19/02 using spectral analysis, e.g. transform vocoders or subband vocoders
• CPC Class Codes: H03H 17/0671 Cascaded integrator-comb [CIC] filters

Abstract

Aspects of a method and/or system for processing high quality audio in a hardware audio CODEC for audio transmission are provided. In this regard, an audio signal may be down-sampled via a cascaded plurality of filters and sample rate converters in the hardware audio CODEC. Additionally, a portion of each sample of the audio signal may be selected based on an origin of the audio signal. The selected portion of each sample of the audio signal may comprise 16 or 18 bits. The selected portion may be determined based on a type, a class, a manufacturer identifier, and/or a model identifier of the origin the audio signal. Coefficients of the filters may be configured based on the origin of the audio signal. One or more of the filters may comprise one or more cascaded biquads. The sample rate converters may comprise one or more CIC decimation filters.

Claims

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

in a hardware audio CODEC;

down-sampling an audio signal via a cascade of a plurality of filters and a plurality sample rate converters; and

selecting, at an output of one or more of said plurality of filters, a portion of each sample of said audio signal based on an origin of said audio signal.

2. The method according to claim 1 comprising configuring coefficients of said plurality of filters based on said origin of said audio signal.

3. The method according to claim 1 wherein one or more of said plurality of filters comprise one or more cascaded biquads.

4. The method according to claim 1 wherein said one or more of said plurality of filters comprise at least one infinite impulse response filters.

5. The method according to claim 1 comprising down-sampling said audio signals to 48 kHz.

6. The method according to claim 1 wherein said one or more sample rate converters comprise at least one cascaded-integrate-comb decimation filter.

7. The method according to claim 1 wherein said selected portion of each sample of said audio signal comprises 16 or 18 bits of said sample.

8. The method according to claim 1 comprising determining said selected portion of each sample of said audio signal based on a type, a class, a manufacturer identifier, and/or a model identifier of said origin of said audio signal.

9. The method according to claim 8 wherein said type comprises one of a digital microphone, an analog microphone, and a line-in jack.

10. The method according to claim 8 wherein said class indicates a dynamic range, signal bandwidth, and/or power level of said origin of said audio signal.

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

one or more circuits for use in a hardware audio CODEC comprising a cascade of a plurality of filters and a plurality of sample rate converters, said one or more circuits operable to;

down-sample an audio signal; and

select, at an output of one or more of said plurality of filters, a portion of each sample of said audio signal based on an origin of said audio signal.

12. The system according to claim 11 wherein said one or more circuits are operable to configure coefficients of said plurality of filters based on said origin of said audio signal.

13. The system according to claim 11 wherein one or more of said plurality of filters comprise one or more cascaded biquads.

14. The system according to claim 11 wherein said one or more of said plurality of filters comprise at least one infinite impulse response filters.

15. The system according to claim 11 wherein said one or more circuits are operable to down-sample said audio signals to 48 kHz.

16. The system according to claim 11 wherein said one or more sample rate converters comprise at least one cascaded-integrate-comb decimation filter.

17. The system according to claim 11 wherein said selected portion of each sample of said audio signal comprises 16 or 18 bits of said sample.

18. The system according to claim 11 one or more circuits are operable to determine said selected portion of each sample of said audio signal based on a type, a class, a manufacturer identifier, and/or a model identifier of said origin of said each sample of said audio signal.

19. The system according to claim 18 wherein said type comprises one of a digital microphone, an analog microphone, and a line-in jack.

20. The system according to claim 18 wherein said class indicates a speed and/or power level of said origin of said each sample of said audio signal.