Title:
情報処理装置および方法、並びに記録媒体
Document Type and Number:
Japanese Patent JP4792613
Kind Code:
B2
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 a band-widening section generates a prediction coefficient alpha W of a wide-band speech signal from a prediction coefficient alpha N of a narrow-band speech signal. An oversampling apparatus oversamples a narrow-band speech signal sndN. An interpolation section generates an adaptive signal excPW of a wide-band speech signal from an adaptive signal excPN of the narrow-band speech signal. A zero-filling section generates a noise signal of a wide-band speech signal from a noise signal excNN 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 excNW. An adder generates an excitation source excW for the wide-band speech signal from the adaptive signal excPW and the noise signal excNW 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 sndW from the wide-band speech signal and the oversampled narrow-band speech signal.
Inventors:
Shiro Omori
Masayuki Nishiguchi
Masayuki Nishiguchi
Application Number:
JP27610399A
Publication Date:
October 12, 2011
Filing Date:
September 29, 1999
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G10L19/00; G10L19/125; G10L19/16; G10L21/0388; G10L25/00; H04B14/04
Domestic Patent References:
| JP9319396A | ||||
| JP8123495A | ||||
| JP11184499A | ||||
| JP10232698A | ||||
| JP10124088A |
Other References:
野村 俊之 Toshiyuki NOMURA,MPEG-4/CELP音声符号化方式 MPEG-4/CELP Speech Coding Algorithm,電子情報通信学会技術研究報告 Vol.98 No.424 IEICE Technical Report,日本,電子情報通信学会 The Institute of Electronics,Information and Communication Engineers,1998年11月,p.19-26
Attorney, Agent or Firm:
Yoshio Inamoto