Patents by Inventor Hiroko Matsuzaka

Hiroko Matsuzaka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4559604
    Abstract: In a machine implemented voice recognition method, as a first step speech signals are analyzed for feature vectors which are used to compare input signals with prestored reference signals. Patterns of any suitable form are used to calculate a similarity distance measure d.sub.IJ which is tested against a threshold to select likely candidates as a first step. A second step selects the most likely candidate by using "common nature" parameters of phonemes such as relative occurrence. Five embodiments of the second step are disclosed, each using a "common nature" criteria of inference to infer (select) the most likely candidate:(1) d'.sub.I =W.sub.1,.W.sub.2.W.sub.3 where W is a weighting factor;(2) d".sub.I =C.sub.I d'.sub.I where C.sub.I is a correction factor;(3) max p(i,j) where p(i) is the probability of occurrence of the phoneme;(4) min d'.sub.ij as a variation of max p(i,j); and(5) N(i) is the numerical similarity of the common characteristics of the selected candidates.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: December 17, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Akira Ichikawa, Hiroko Matsuzaka