Abstract: A pattern adapting apparatus including an input pattern forming unit, a tree structure standard pattern storing unit for storing a tree structure standard pattern including a tree structure indicative of inclusive relationships among categories and a parameter set at each node of the tree structure, a pattern matching unit for matching categories of the tree structure standard pattern with input samples of an input pattern, a tree structure standard pattern modifying unit for modifying a tree structure standard pattern based on the results of pattern matching, a node set selecting unit for calculating a description length with respect to a plurality of node sets in a tree structure pattern to select an appropriate node set, a modified standard pattern forming unit for forming a modified standard pattern by using a parameter set of a selected node set, and a standard pattern for recognition storing unit for storing a modified standard pattern.

Abstract: In a reference pattern adapting device for adapting reference pattern parameter groups (1-M) to adapted reference pattern parameter groups (1-M) by using training patterns (1-L) derived from a training pattern signal (TP). A similarity calculating unit (15) calculates a group of primary degrees of similarity between (a) each of M reference pattern element groups representative of reference patterns (output of a vector group memory 11) and (b) each of M reference pattern parameter groups (output of pattern parameter memory 12). A difference calculating unit (16) calculates a group of differences between reference pattern elements of each of the M reference pattern element groups and training pattern elements of each of L training pattern element groups representative of the training patterns (1-L). A first calculating unit (21) calculates a primary difference value by using the group of primary degrees of similarity and the group of differences.