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:
Mar. 23, 2004
Filed:
Sep. 28, 2000
Shiro Omori, Kanagawa, JP;
Masayuki Nishiguchi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
In order to improve the accuracy of an excitation source for a band-spreading apparatus and to generate a wide-band signal having no gaps, an &agr; band-widening section generates a prediction coefficient &agr; of a wide-band speech signal from a prediction coefficient &agr; of a narrow-band speech signal. An oversampling apparatus oversamples a narrow-band speech signal snd . An interpolation section generates an adaptive signal exc of a wide-band speech signal from an adaptive signal exc of the narrow-band speech signal. A zero-filling section generates a noise signal of a wide-band speech signal from a noise signal exc of the narrow-band speech signal. A noise addition section adds a noise signal which is a gap of the wide-band speech signal and generates a noise signal exc . An adder generates an excitation source exc for the wide-band speech signal from the adaptive signal exc and the noise signal exc of the wide-band speech signal. A wide-band LPC combining section generates a wide-band speech signal. A band suppression section suppresses a frequency band contained in the narrow-band speech signal within the wide-band speech signal. An adder outputs a wide-band speech signal snd from the wide-band speech signal and the oversampled narrow-band speech signal.