METHOD AND SYSTEM FOR UTILIZING RATE CONVERSION FILTERS TO REDUCE MIXING COMPLEXITY DURING MULTIPATH MULTI-RATE AUDIO PROCESSING

• US 20080133224A1
• Filed: 11/30/2006
• Published: 06/05/2008
• Est. Priority Date: 11/30/2006
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Chang, Li Fung, Kong, Hongwei, Sollenberger, Nelson, Zeng, Huaiyu
• Application Number:
  US11/565,342
• Publication Number:
  US 20080133224A1
• Time in Patent Office: Days
• US Class Current: 704/201
• CPC Class Codes: G10L 19/173 Transcoding, i.e. converting between two coded representations avoiding cascaded coding-decoding
• CPC Class Codes: H03H 17/0279 having two phases
• CPC Class Codes: H03H 17/04 Recursive filters
• CPC Class Codes: H03H 17/0444 where the output-delivery frequency is higher than the input sampling frequency, i.e. interpolation
• CPC Class Codes: H03H 17/06 Non-recursive filters

Abstract

Methods and systems for processing multipath, multi-rate digital audio signals are disclosed herein. Aspects of the method may comprise up-sampling a number of digital audio signals and converting the up-sampled digital audio signals to a common data rate prior to mixing. The digital audio signals sampling rates may be converted utilizing half-band interpolators. The up-sampling may also utilize infinite impulse response interpolators. A portion of the up-sampled digital audio signals may have a common data rate. The common data rate may be determined by the number half-band interpolators utilized. Distortion in the digital audio signals may be compensated utilizing an infinite impulse response filter or a finite impulse response filter.

Claims

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

receiving a plurality of digital audio signals at a plurality of different data rates; and

up-sampling each of said received plurality of digital audio signals; and

converting said up-sampled received digital audio signals to a common data rate prior to mixing.

2. The method according to claim 1, comprising converting said plurality of sampling rates in said digital audio signals utilizing half-band interpolators.

3. The method according to claim 2, wherein said common data rate is determined by a number of said half-band interpolators.

4. The method according to claim 1, wherein said up-sampling utilizes infinite impulse response interpolators.

5. The method according to claim 1, wherein a portion of said up-sampled received plurality of digital audio signals has a common data rate.

6. The method according to claim 1, comprising compensating for distortion in each of said plurality of digital audio signals utilizing infinite impulse response filters.

7. The method according to claim 1, comprising compensating for distortion in each of said plurality of digital audio signals utilizing finite impulse response filters.

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

one or more circuits for receiving a plurality of digital audio signals at a plurality of different data rates; and

said one or more circuits up-sampling each of said received plurality of digital audio signals; and

said one or more circuits converting said up-sampled received digital audio signals to a common data rate prior to mixing.

9. The system according to claim 8, comprising up-converting said plurality of sampling rates in said digital audio signals utilizing half-band interpolators.

10. The system according to claim 9, wherein said common data rate is determined by a number of said half-band interpolators.

11. The system according to claim 8, wherein said up-sampling utilizes infinite impulse response interpolators.

12. The system according to claim 8, wherein a portion of said up-sampled received plurality of digital audio signals has a common data rate.

13. The system according to claim 8, wherein compensating for distortion in each of said plurality of digital audio signals utilizes infinite impulse response filters.

14. The system according to claim 8, wherein compensating for distortion in each of said plurality of digital audio signals utilizes finite impulse response filters.

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

receiving a plurality of digital audio signals at a plurality of different data rates; and

up-sampling each of said received plurality of digital audio signals; and

converting said up-sampled received digital audio signals to a common data rate prior to mixing.

16. The machine readable storage according to claim 15, wherein said at least one code section comprises code for up-converting said plurality of sampling rates in said digital audio signals utilizing half-band interpolators.

17. The machine readable storage according to claim 16, wherein said at least one code section comprises code for determining said common data rate by a number of said half-band interpolators.

18. The machine readable storage according to claim 15, wherein said at least one code section comprises code for up-sampling said each of said received plurality of digital audio signals utilizing infinite impulse response interpolators.

19. The machine readable storage according to claim 15, wherein said at least one code section comprises code for setting a portion of said up-sampled received plurality of digital audio signals at a common data rate.

20. The machine readable storage according to claim 15, wherein said at least one code section comprises code for compensating for distortion in each of said plurality of digital audio signals utilizing infinite impulse response filters.

21. The machine readable storage according to claim 15, wherein said at least one code section comprises code for compensating for distortion in each of said plurality of digital audio signals utilizing finite impulse response filters.