The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 1989
Filed:
May. 20, 1986
Jacques Guichard, 75015 Paris, FR;
Eric Cassimatis, 75016 Paris, FR;
Other;
Abstract
A circuit for the fast calculation of the discrete cosine transform (X.sub.i), 0.ltoreq.i.ltoreq.N-1, in which N=2.sup.n and n is an integer of a signal defined by a sequence (x.sub.i), 0.ltoreq.i.ltoreq.N-1 includes a first adder stage receiving the sequence (x.sub.i), 0.ltoreq.i.ltoreq.N-1, and supplying two sequences (x.sub.i.sup.o) and y.sub.i.sup.i) and 0.ltoreq.i.ltoreq.(N/2)-1, a group of upper half-stages receiving the sequence of x.sup.o.sub.i) and supplying the sequence (X.sub.2q) of the even components of the cosine transform. That group constitutes a circuit for the fast calculation of the cosine transform for a group of (N/2) points and a group of lower half-stages receiving the sequence (y.sub.i) and supplying the sequence (X.sub.2q+1) of the odd components of the cosine transform.