Discrete cosine transformer

Details Discrete cosine transformer Discrete cosine transformer

1987-02-04

1989-01-10

Malzahn, David H.

Boots, shoes, and leggings

G06F 15332

Patent

active

047978473

ABSTRACT:
The device is applicable to data compression. It computes the discrete cosine transform X of a signal x represented by N digitized samples x, . . . x, . . . x, where N is a power of 2: ##EQU1## the device includes a convolver for convolution between the samples xi and a stored sequence of samples wi (N) and a set of identical elementary circuits grouped in serveral banks. Each circuit is a "butterfly" having two inputs and two outputs one of which delivers the sum and the other the difference of the two inputs. The elementary circuits of the first bank receive at their two inputs the samples of the convolution product whose indices are separated by N/2 from each other.

REFERENCES:
patent: 3920974 (1975-11-01), Means
patent: 4152772 (1979-05-01), Speiser et al.
patent: 4196448 (1980-04-01), Whitehouse et al.
patent: 4385363 (1983-05-01), Widergren et al.
patent: 4449194 (1984-05-01), Wilhelm
patent: 4675836 (1987-06-01), Arnould et al.
Chen et al., "A Fast Computational Algorithm for the Discrete Cosine Transform" IEEE Trans. on Communications, vol. COM-25, No. 9, Sep. 1977, pp. 1004-1009.

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