On Reverse Waterfilling in Closed-Loop LPC with Noise Shaping
Konferenz: Speech Communication - 11. ITG-Fachtagung Sprachkommunikation
24.09.2014 - 26.09.2014 in Erlangen, Deutschland
Tagungsband: Speech Communication
Seiten: 4Sprache: EnglischTyp: PDF
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Autoren:
Krueger, Hauke; Geiser, Bernd; Vary, Peter (Institute of Communication Systems and Data Processing, RWTH Aachen University, 52056 Aachen, Germany)
Inhalt:
A new criterion is derived for the design of the noise weighting filter in linear predictive coding (LPC) that accounts for the issue of noise propagation. It will be shown that the new filter design constitutes an approximation of the reverse waterfilling procedure known from rate-distortion theory and audio transform coding. It improves the overall coding SNR of closed-loop LPC with noise shaping. A practical application within the 3GPP AMRWB codec is presented. Objective test results indicate notable quality improvements.