Systems and methods for implementing a sample rate converter using hardware and software to maximize speed and flexibility

USRE43489E1 · kind E1 · reissue

Assignee

• D2Audio Corporation · US

Inventors

• Jack B. Andersen · Austin, US
• Larry E. Hand · Meridian, US
• Daniel L. W. Chieng · Austin, US
• Joel Page · Austin, US
• Wilson E. Taylor · Austin, US
• Tonya Andersen · Denver, US

Key dates

• Filing date: Jan 23, 2009
• Grant date: Jun 26, 2012
• Expiry date: Jan 23, 2029

Classification

• Technology area (CPC —): General

Abstract

Systems and methods for converting a digital input data stream from a first sample rate to a second, fixed sample rate using a combination of hardware and software components. In one embodiment, a system includes a rate estimator configured to estimate the sample rate of an input data stream, a phase selection unit configured to select a phase for interpolation of a set of polyphase filter coefficients based on the estimated sample rate, a coefficient interpolator configured to interpolate the filter coefficients based on the selected phase, and a convolution unit configured to convolve the interpolated filter coefficients with samples of the input data stream to produce samples of a re-sampled output data stream. One or more hardware or software components are shared between multiple channels that can process data streams having independently variable sample rates.