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This paper presents the designing of direct form transposed FIR interpolator on the basis of MAC algorithm. There are various configurations or structures for realization of any FIR filter System. For wireless and audio applications the use of efficient digital filter is increasing because of speed of conversion and less hardware requirement. Interpolator is useful for smoothing signals such as sinusoids or baseband I/Q waveforms. Interpolation is the estimation of the unknown, or the lost, samples of a signal using a weighted average of a number of known samples at the neighborhood points. For this purpose, interpolation filter is used to produce new samples of the waveform accurately without reducing signal quality. A number of design methodologies have been used and work done on interpolator has been reviewed.

Pallavi Chande, Gurpreet Walia

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