Method and system for processing multi-rate audio from a plurality of audio processing sources

• US 7,852,239 B2
• Filed: 10/13/2008
• Issued: 12/14/2010
• Est. Priority Date: 11/30/2006
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Zeng, Huaiyi (Hanks), Cheng, Taiya, Chang, Li Fung, Hayek, Claude, Kong, Hongwei, Sollenberger, Nelson
• Primary Examiner(s): Lauture; Joseph
• Application Number:
  US12/250,233
• Publication Number:
  US 20090098902A1
• Time in Patent Office: 792 Days
• Field of Search: 341/61, 381/17, 381/119, 712/36, 375/340, 455/99, 455/3.06, 455/556.1, 455/403
• US Class Current: 341/61
• CPC Class Codes: G10L 19/18 Vocoders using multiple modes
• CPC Class Codes: H04S 1/007 in which the audio signals are in digital form data reduction aspects thereof based on psychoacoustics G10L19/02
• CPC Class Codes: H04S 2400/13 Aspects of volume control, not necessarily automatic, in stereophonic sound systems

Abstract

One or more circuits in a mobile phone may be utilized for up sampling two or more audio signals to a same data sampling rate. Each audio signal, such as digital audio, voice, and polyringer, for example, may be received at one of a plurality of data sampling rates and one or more of the following wireless standards: WCDMA, HSDPA, GSM, GPRS, EDGE, and/or Bluetooth. Audio signals may be equalized and/or compensated with an FIR filter before up sampling or with an IIR filter to reduce overall processing latency. Multiple half-band interpolation operations may perform the up sampling. The first half-band filter may be replaced by an IIR filter to reduce overall processing latency. A gain of the up-sampled data may be adjusted to reduce noise effects. The channels of the up-sampled audio signals may be mixed and later further up sampled for subsequent communication to an output device.

Claims

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

one or more circuits in a mobile phone, said one or more circuits are operable to up sample two or more audio signals to a same data sampling rate, wherein each of said audio signals is received within said mobile phone at a plurality of data sampling rates;

said one or more circuits are operable to separately mix left and right channels of said up-sampled audio signals; and

said one or more circuits are operable to up sample said mixed left and right channels for subsequent communication to an output communicatively coupled to said one or more circuits.

2. The system according to claim 1, wherein said audio signals comprise digital audio data, digital voice data, and digital polyringer data.

3. The system according to claim 1, wherein said mobile phone supports one or more of the following wireless standards:

WCDMA, HSDPA, GSM, GPRS, EDGE, and/or Bluetooth.

4. The system according to claim 1, wherein said one or more circuits are operable to up sample said audio signals via at least one half-band interpolation operation.

5. The system according to claim 1, wherein said one or more circuits are operable to down sample said up-sampled mixed left and right channels for communication to a Bluetooth radio.

6. The system according to claim 1, wherein said one or more circuits are operable to dynamically adjust a gain of at least one of said left and right channels of said up-sampled audio signals.

7. The system according to claim 6, wherein said one or more circuits are operable to program a ramp-up or ramp-down of said dynamically adjusted gain.

8. The system according to claim 1, wherein said one or more circuits are operable to multi-band equalize said audio signals prior to said up sampling to said same data sampling rate.

9. The system according to claim 8, wherein said one or more circuits are operable to select a finite impulse response (FIR) filter for compensation of said multi-band equalized audio signals prior to said up sampling to said same data sampling rate.

10. A system for wireless communication, the system comprising:

a processor in a mobile phone that is operable to up sample two or more audio signals to a same data sampling rate, wherein each of said audio signals is received within said mobile phone at a plurality of data sampling rates;

said processor is operable to separately mix left and right channels of said up-sampled audio signals; and

said processor is operable to up sample said mixed left and right channels for subsequent communication to an output communicatively coupled to said processor.

11. The system according to claim 10, wherein said audio signals comprise digital audio data, digital voice data, and digital polyringer data.

12. The system according to claim 10, wherein said mobile phone supports one or more of the following wireless standards:

WCDMA, HSDPA, GSM, GPRS, EDGE, and/or Bluetooth.

13. The system according to claim 10, wherein said processor is operable to up sample said audio signals via at least one half-band interpolation operation.

14. The system according to claim 10, wherein said processor is operable to down sample said up-sampled mixed left and right channels for communication to a Bluetooth radio.

15. The system according to claim 10, wherein said processor is operable to dynamically adjust a gain of at least one of said left and right channels of said up-sampled audio signals.

16. The system according to claim 15, wherein said processor is operable to program a ramp-up or ramp-down of said dynamically adjusted gain.

17. The system according to claim 10, wherein said processor is operable to multi-band equalize said audio signals prior to said up sampling to said same data sampling rate.

18. The system according to claim 17, wherein said processor is operable to select a finite impulse response (FIR) filter for compensation of said multi-band equalized audio signals prior to said up sampling to said same data sampling rate.

19. A method for signal processing, the method comprising:

converting, via a processor in a mobile phone, sampling rates of signals from a plurality of audio sources to a same sampling rate in two stages, wherein a first stage utilizes a plurality of upsample-by-two filters that reduces said sampling rates to a reduced set of sampling rates and a second stage utilizes an N-order polynomial interpolator to convert said reduced set of sampling rates to said same sampling rate.

20. The system according to claim 19, wherein said N-order polynomial interpolator is of order N≦

4.

21. The system according to claim 19, comprising substituting the operations of a first of said plurality of upsample-by-two filters with an IIR filter.

22. The system according to claim 21, comprising compensating said IIR filter to reduce latency.