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The Basic Idea
An analog signal is typically reconstructed from a discrete-time signal using a digital-to-analog converter (DAC) followed by a reconstruction filter.
The spectrum of the DAC output signal is distorted by a sinc envelope, with the nulls of the sinc envelope falling in the center of each image other than the baseband.
The reconstruction filter must remove the images and correct for the sinc distortion in the baseband. The close spacing between the baseband and the adjacent images can make ...