Method, apparatus and system for digital data resampling...

Details Method, apparatus and system for digital data resampling... Method, apparatus and system for digital data resampling...

2005-07-05

2005-07-05

Hoff, Marc S. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C708S313000

Reexamination Certificate

active

06915225

ABSTRACT:
The present invention provides a methodology, apparatus and system for resampling digital data utilizing a Fourier series based interpolation engine104. A quick means to up-sample or down-sample data is provided without requiring computationally intensive processing. This is accomplished by utilizing low order coefficients of terms of a complete Fourier series expansion for a continuous signal. The summation of the expansion is limited to input samples immediately adjacent in time to the desired output. Generally speaking, the output is normally required to be a constant sampling rate, therefore, the input and output rates are related by an integer ratio. This ratio can be greater or smaller than one, providing up-sampling or down-sampling as appropriate. By employing the present invention, a DSP engine can be constructed that is adjustable to any ratio of sampling rates in a computationally efficient manner with low RMS error while preserving convolution through the resampling process.

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