Abstract: An apparatus and method are provided for performing both forward and inverse Haar transforms of a sequence of n-bit data samples. The forward Haar transform apparatus has sum-and-truncate logic and a plurality of coefficient generators. The sum-and-truncate logic generates a plurality of n-bit intermediate terms. The plurality of coefficient generators is coupled to the sum-and-truncate logic. The plurality of coefficient generators generate a plurality of spectral coefficients, where at most n+1 bits are required to represent each of the plurality of spectral coefficients. The inverse Haar transform apparatus has index signal and inverse transform logic. The index signal indicates a specific n-bit sample, the specific n-bit sample being one of a sequence of n-bit samples corresponding to the Haar transform. The inverse transform logic is coupled to the index signal.