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US 8,023,590 B2Granted
NICAM audio signal resampler
AssigneeTHAT Corporation
InventorsRoger R. Darr, Matthew F. Easley, Matthew S. Barnhill
Life of this patent
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Abstract
A NICAM audio signal re-sampler may include a non-linear interpolator configured to interpolate in a non-linear manner between sequential digital samples that are based on a stream of demodulated NICAM audio samples. A phase differential calculator may be included that compares phase information at different resolutions.
Claims20
A digital sample rate converter comprising:
- a digital up sampler configured to receive a first stream of digital samples of an analog signal at a first frequency and to generate a second stream of digital samples at a second frequency that is substantially higher than the first frequency and that substantially tracks the first stream of digital samples;
- and
- a non-linear interpolator configured to interpolate between two sequential digital samples in the second stream of digital samples in a non-linear manner, wherein the non-linear interpolator is configured to interpolate at points in time that are based on a phase difference between the first stream of digital samples and a local sample clock.
Dependencies are inferred from the claim text.