Back to results
US 5,694,345 AGranted
Hardware efficient interpolation filter
AssigneeThomson Consumer Electronics, Inc.
InventorEric Carl Peterson
Life of this patent
Estimating the term…
Abstract
An interpolation filter includes a subtractor, a weighting circuit and an adder, wherein the subtractor is conditioned to form differences of adjacent original samples, and the weighting circuit weights the differences with a predetermined value. The adder is arranged to a) pass an original sample; b) add a weighted difference to the original sample; and c) successively add the weighted difference to the previously generated sample to form successive samples.
Claims7
An interpolator comprising:
- a source of input samples;
- delay circuitry arranged to concurrently supply two input samples;
- a subtractor having first and second input ports coupled to receive said two input samples;
- adder circuitry conditioned to add a weighted difference provided by said subtractor to one of said two input samples to produce an interpolated sample, and conditioned to add said weighted difference to said interpolated sample to produce a further interpolated sample, said adder circuitry including;
- an adder having first and second input ports and an output port;
- a multiplexer having an output port coupled to the first input port of said adder, having a first input port coupled to the output port of said adder, and having a second input port coupled to said delay circuitry;
- and
- further circuitry having an output port coupled to said second input port of said adder, and having an input port coupled to said subtractor and conditioned to couple a difference signal or a zero value to said adder.
5 more elements
Dependencies are inferred from the claim text.