Low-complexity sampling rate conversion method and apparatus for audio processing

• US 20070040713A1
• Filed: 10/26/2006
• Published: 02/22/2007
• Est. Priority Date: 02/02/2004
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Chen, Juin-Hwey
• Granted Patent: US 7,378,995 B2
• Time in Patent Office: Days
• US Class Current: 341/61
• CPC Class Codes: H03H 17/028 Polynomial filters
• CPC Class Codes: H03H 17/0621 with input-sampling frequency and output-delivery frequency which differ, e.g. extrapolation; Anti-aliasing

Abstract

A low-complexity sampling rate conversion (SRC) method and apparatus for the processing of digital audio signals. A first stage upsamples an input audio signal to generate an upsampled audio signal. For example, the first stage may perform 1:2 upsampling using a halfband filter. A second stage re-samples the upsampled audio signal from the first stage at a target sampling rate. For example, re-sampling may be achieved using linear interpolation.

Claims

1. A method for converting a digital audio signal from a first sampling rate to a second sampling rate, comprising:

upsampling the audio signal to generate an upsampled audio signal; and

re-sampling said upsampled audio signal at the second sampling rate using linear interpolation.