Patent ID: 7253753

Claim:
A method of converting a first digital audio signal at a first sampling rate to a second digital audio signal at any of a plurality of sampling rates that are higher than said first sampling rate, said method comprising: up-sampling said first digital audio signal by an up-sampling factor to generate an up sampled audio signal; low-pass filtering said up-sampled audio signal using a fixed set of filter coefficients to generate a filtered audio signal; and down-sampling said filtered audio signal by any of a plurality of down-sampling factors corresponding to said plurality of sampling rates, wherein each of said plurality of down-sampling factors is lower than said up-sampling factor, to generate said second digital audio signal at any of said plurality of audio sampling rates, wherein said down-sampling includes performing linear interpolation between filtered samples of said filtered audio signal to generate interpolated output samples of said second digital audio signal, wherein said linear interpolation is performed using an accumulated linear interpolation ratio that is based on a current down-sampling factor of said plurality of down-sampling factors and a current phase of said second digital audio signal.