Method and apparatus of performing sample rate conversion of...

Details Method and apparatus of performing sample rate conversion of... Method and apparatus of performing sample rate conversion of...

2007-08-07

2007-08-07

Pendleton, Brian (Department: 2615)

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

C348S485000, C381S002000

Reexamination Certificate

active

10082950

ABSTRACT:
A method and apparatus are disclosed for performing sampling rate conversion of an audio signal from a first sampling rate to any of a plurality of higher sampling rates using a single set of low-pass filter coefficients. Sampling rate conversion is accomplished by effectively up-sampling, low-pass filtering, and down-sampling the audio signal to generate interpolated output samples of a second digital audio signal at any of a plurality of sampling rates. The sampling rate conversion process includes storing a fixed set of filter coefficients as a plurality of phased subsets of filter coefficients, applying samples of the audio signal to the phased subsets in a rotational manner to generate filtered samples of the audio signal, and selecting and linear interpolating between certain filtered samples to generate samples of the second digital audio signal.

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patent: 2002/0140853 (2002-10-01), Yang et al.
patent: WO 00/65713 (2000-11-01), None
patent: WO 01/99277 (2001-12-01), None

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