High order SINC filter
AssigneeLucent Technologies Inc.
InventorDonald Duttweiler
Life of this patent
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Abstract
A high order SINC interpolator and as a high order SINC decimator. The high order SINC interpolator includes an interpolator input and a plurality of cascades of integrators. The inputs of each of the cascades are coupled to the interpolator input through a low frequency delay circuit. The outputs of each of the cascades of integrators are coupled through a plurality of adders to generate a single interpolator output. The high order SINC decimator includes a decimator input and a plurality of cascades of integrators. The decimator input is coupled to the input of each of the cascades of the integrators. At least one low frequency delay circuit is coupled to an output of the cascades of the integrators and the output of each low frequency delay circuit is coupled to the decimator output through an adder.
Claims10
An Mth-order SINC interpolator comprising:
- M rows of (M−1)-order cascades of integrators which are coupled together, wherein each one of the cascades of integrators has an input and an output, and wherein the inputs of the cascades of integrators in one row are periodically initialized to zero, and the inputs of the cascades of integrators in the other rows are periodically initialized to values taken from the other rows.
A third-order SINC interpolator comprising:
- first, second and third cascades of integrators, wherein each cascade of integrators has an input and an output, the inputs of each of the cascades being coupled to an interpolator input which receives low frequency signals of varying delays and the inputs of the cascades of integrators in one row are periodically initialized to zero, and the inputs of the cascades of integrators in the other rows are periodically initialized to values taken from the other rows;
- and
- the outputs of each of the cascades of integrators being coupled through a plurality of adders to generate a single integrator output.
Dependencies are inferred from the claim text.