Modular discrete cosine transform system

Details Modular discrete cosine transform system Modular discrete cosine transform system

1975-11-03

1976-07-27

Ruggiero, Joseph F.

Registers

Transfer mechanism

Traveling pawl

235156, 324 77B, G06G 722, G06F 1534

Patent

active

039719278

ABSTRACT:
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.

REFERENCES:
patent: 3803391 (1974-04-01), Vernet
patent: 3881097 (1975-04-01), Lehmann et al.
patent: 3920974 (1975-11-01), Means
patent: 3925648 (1975-12-01), Speiser et al.

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