Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Reexamination Certificate
2006-10-17
2006-10-17
Lerner, Martin (Department: 2626)
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
C704S209000, C704S225000
Reexamination Certificate
active
07124077
ABSTRACT:
A method and system of performing postfiltering in the frequency domain to improve the quality of a speech signal, especially for synthesized speech resulting from codecs of low bit-rate, is provided. The method comprises LPC tilt computation and compensation methods and modules, a formant filter gain computation method and module, and an anti-aliasing method and module. The formant filter gain calculation employs an LPC representation, an all-pole modeling, a non-linear transformation and a phase computation. The LPC used for deriving the postfilter may be transmitted from an encoder or may be estimated from a synthesized or other speech signal in a decoder or receiver. The invention may be implemented in a linked decoder and encoder. A separate LPC evaluation unit that is responsible for processing and or deriving the LPC may be implemented within the invention.
REFERENCES:
patent: 5067158 (1991-11-01), Arjmand
patent: 5701390 (1997-12-01), Griffin et al.
patent: 5752222 (1998-05-01), Nishiguchi et al.
patent: 5812966 (1998-09-01), Byun et al.
patent: 5890108 (1999-03-01), Yeldener
patent: RE36478 (1999-12-01), McAulay et al.
patent: 6047254 (2000-04-01), Ireton et al.
patent: 6073092 (2000-06-01), Kwon
patent: 6098036 (2000-08-01), Zinser, Jr. et al.
patent: 6449592 (2002-09-01), Das
patent: 6505152 (2003-01-01), Acero
patent: 6704711 (2004-03-01), Gustafsson et al.
patent: 6941263 (2005-09-01), Wang et al.
Kabal et al., “Adaptive Postfiltering for Enhancement of Noisy Speech in the Frequency Domain,” Proceedings of the International Symposium on Circuits and Systems, IEEE, vol. 1, SYMP 24, pp. 312-315 (Jun. 1991).
Cuperman Vladimir
Gersho Allen
Khalil Hosam A.
Wang Hong
Lerner Martin
Microsoft Corporation
Microsoft Corporation
LandOfFree
Frequency domain postfiltering for quality enhancement of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frequency domain postfiltering for quality enhancement of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency domain postfiltering for quality enhancement of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3670994