NICAM audio signal resampler
AssigneeTHAT Corporation
InventorsRoger Darr, Matthew Easley, Matthew Barnhill
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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.
Claims35
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.
A phase differential calculator comprising:
- a first phase accumulator configured to generate information indicative of the phase of a local sample clock at a first resolution;
- a clock generator configured to generate a generated clock and information indicative of the phase of the generated clock at a second resolution that is lower than the first resolution as a function of a phase comparison and in synchronism with a remote sample clock;
- and
- a phase comparator configured to generate the phase comparison based on a phase difference between the information indicative of the phase of the local sample clock and the information indicative of the phase of the generated clock.
A NICAM audio signal re-sampler comprising 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.
Dependencies are inferred from the claim text.