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:
Jan. 01, 1991
Filed:
Jul. 05, 1989
Shunichi Yajima, Hachioji, JP;
Akira Ichikawa, Musashino, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A speech analysis method which includes the steps of detecting a maximum-level position in that portion of an input speech signal which exists in a period equal to the pitch period of the input speech signal from a predetermined one of periodically-generated timing pulses, tracing the speech signal from the maximum-level position in a time reversing direction to find a zero-crossing point where the level of the traced signal is first reduced to zero, extracting a one-pitch signal which starts from the zero-crossing point and has the duration equal to the pitch period of the input speech signal, from the speech signal, and carrying out Fourier transform for the one-pitch signal to obtain a spectrum of the input speech signal.