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US 8,494,104 B2Granted
NICAM decoder with output 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.
Claims5
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, wherein the clock generator includes an adder configured to repeatedly add an amount to a sum that is a function of the phase comparison and in synchronism with the 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.
1 more element
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, wherein the clock, generator is configured to generate the generated clock based on a filtering of the phase comparison by a second order phase-locked loop filter;
- 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.
1 more element
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, wherein the clock generator is configured to update the information indicative of the phase of the generated clock at a frequency that is an integer multiple of the 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.
1 more element
Dependencies are inferred from the claim text.