Discrete Transform Systems Using Permuter Memories.
DEPARTMENT OF THE NAVY WASHINGTON DC
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This patent describes a high-speed, high-accuracy, apparatus for performing discrete Fourier and discrete cosine transforms, suitable for signal processing applications. The apparatus includes a means for switching an input signal from a sample-and-hold circuit to a circuit which includes an integrator in cascade with an amplifier. The outputs of these two circuits are summed in a first summer to give one term. G sub 0, which is proportional to the d-c component of the input signal. In parallel with the integrator and amplifier is a cascade circuit comprising a first permuter, a filter and a second permuter. A permuter is a special type of memory. The outputs of the sample-and-hold circuit and of the second permuter are summed in a second summer, to result in an output comprising the other transformed terms, G sub 1,..., G sub N-1. Author
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