Title :
Audio codingwith power spectral density preserving quantization
Author :
Li, Minyue ; Klejsa, Janusz ; Ozerov, Alexey ; Kleijn, W. Bastiaan
Author_Institution :
Sch. of Electr. Eng., KTH R. Inst. of Technol., Stockholm, Sweden
Abstract :
The coding of audio-visual signals is generally based on different paradigms for high and low rates. At high rates the signal is approximated directly and at low rates only signal features are transmitted. The recently introduced distribution preserving quantization (DPQ) paradigm provides a seamless transition between these two regimes. In this paper we present a simplified scheme that preserves the power spectral density (PSD) rather than the probability distribution. In a practical system the PSD must be estimated. We show that both forward adaptive and backward adaptive PSD estimation are possible. Our experimental results confirm that preservation of PSD at finite precision leads to a unified coding paradigm that provides effective coding at both high and low rates. An audio coding application shows the perceptual benefits of PSD preserving quantization.
Keywords :
adaptive estimation; audio coding; audio-visual systems; quantisation (signal); DPQ paradigm; PSD preserving quantization; audio-visual signal coding; backward adaptive PSD estimation; distribution preserving quantization paradigm; forward adaptive PSD estimation; power spectral density preserving quantization; probability distribution; Adaptation models; Audio coding; Estimation; Lattices; Quantization; Speech; Quantization; audio coding; backward adaptation; forward adaptation; predictive coding;
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2012 IEEE International Conference on
Conference_Location :
Kyoto
Print_ISBN :
978-1-4673-0045-2
Electronic_ISBN :
1520-6149
DOI :
10.1109/ICASSP.2012.6287904