USA As Represented by Secretary of the Navy

Herbert M Federhen

Jeffrey M Speiser

Apparatus for performing an even discrete cosine transform (EDCT) on an it signal of size 2N, with components for an EDCT of size N, which comprises four similar modules, for performing an extended discrete Fourier transform (EDFT) on their input signals. Each EDFT module comprises means for generating the signal ##EQU1## s = - (N- 1), . . . , (N- 1), an input multiplier, a transversal filter, and an output multiplier. The apparatus further comprises a switching means, means for generating a signal (- 1).sup.n, two input multipliers, two complex attenuators, two other means for generating a signal, four output multipliers, two signal summers, and two circuits for taking the real part of an input signal.

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San Diego, CA, United States of America

Herbert M Federhen