A delay register section 31 holds SD pixels of a luminance signal and a classification section 33 decides a class, reads a coefficient corresponding to the decision result from a coefficient RAM section 40, and outputs the coefficient to a product-sum section 38. The product-sum section 38 captures the...http://www.google.com/patents/US6115073?utm_source=gb-gplus-sharePatent US6115073 - Signal converting apparatus and method using a class decision circuit
