Apparatus for performing a discrete cosine transform of an input

Details Apparatus for performing a discrete cosine transform of an input Apparatus for performing a discrete cosine transform of an input

1976-12-20

1979-05-01

Malzahn, David H.

Boots, shoes, and leggings

364826, G06F 1534, G06G 712

Patent

active

041527720

ABSTRACT:
Apparatus for performing a discrete cosine transform of an input signal, table for real-time television image processing, specifically for obtaining an acceptable picture when the number of bits of information available for describing the picture and/or the channel bandwidth are severely limited, comprising: two read-only memories, each containing a predetermined number of +1's and -1's arranged in a predetermined manner; two multipliers, each having an input from one of the read-only memories, and another, joint, input connectable to the input signal which is to be transformed discretely and cosinusoidally; two transversal filters, each having N taps, rather than twice the number (2N-1) of taps in the prior art discrete cosine filters, the input to each filter being the output of one of the multipliers; and a single-pole double-throw switch, which switches position at every shift of the samples through the filter, the output of the transform apparatus being connected to the switch arm, each of the free terminals of the switch being connected to the output of one of the transversal filters.

REFERENCES:
patent: 3900721 (1975-08-01), Sperser et al.
patent: 3920974 (1975-11-01), Means
patent: 3965343 (1976-06-01), Speiser et al.
patent: 3971927 (1976-07-01), Speiser et al.
patent: 4049958 (1977-09-01), Hartmann

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