Interpolation of digital signals using signal sample replication

Details Interpolation of digital signals using signal sample replication Interpolation of digital signals using signal sample replication

1995-04-17

1997-08-12

Elmore, Reba I.

Boots, shoes, and leggings

341 61, G06F 1717

Patent

active

056572611

ABSTRACT:
A filtering technique that results in improved performance of interpolating filters. The improved filter and technique replicates samples of the digital input signal instead of inserting zeroes before smoothing to eliminate undesired images of the sampled input signal. The filter includes a digital equivalent of a sample and hold for sampling the digital input signal at the input sample rate and for replicating the sampled digital input signal a predetermined number of times to increase the sample rate by an integer multiple and produce replicated samples of the input signal. A smoothing filter is coupled to the digital sample and hold for smoothing the replicated samples. The smoothing filter has a shape having a high frequency enhancement followed by a sharp cutoff that compensates for the replicated samples of the input signal. Interpolated digital output signals are provided therefrom that are at a sample rate higher than the input sample rate.

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