Title :
Spectral postfilter design based on LSP transformation
Author :
Tasaki, H. ; Shiraki, K. ; Tomita, K. ; Takahashi, S.
Author_Institution :
Inf. Technol. R&D Center, Mitsubishi Electr. Corp., Kanagawa, Japan
Abstract :
A new spectral postfilter that has high flexibility of design is proposed. In this method, two LSP (line spectrum pair) transformation blocks compute ARMA filter coefficients for the postfilter. The characteristics of the proposed postfilter can be flexibly designed in the frequency domain, because an effect of LSP transformation can be estimated in the frequency domain. As examples of design, an approximation to a conventional LPC-based postfilter, enhancement in selected frequency bands, and a suitable design for a tandem coding are demonstrated
Keywords :
acoustic filters; autoregressive moving average processes; frequency-domain analysis; linear predictive coding; spectral analysis; speech coding; speech enhancement; speech processing; transforms; ARMA filter coefficients; LPC-based postfilter; LSP transformation blocks; enhancement; frequency band; frequency domain; line spectrum pair; linear predictive coding; spectral postfilter design; tandem coding; Decoding; Equations; Filters; Frequency domain analysis; Frequency estimation; Information technology; Noise reduction; Speech coding; Speech enhancement; Stability;
Conference_Titel :
Speech Coding For Telecommunications Proceeding, 1997, 1997 IEEE Workshop on
Conference_Location :
Pocono Manor, PA
Print_ISBN :
0-7803-4073-6
DOI :
10.1109/SCFT.1997.623894
