DocumentCode :
699624
Title :
High rate spherical quantization of sinusoidal parameters
Author :
Korten, Pim ; Jensen, Jesper ; Heusdens, Richard
Author_Institution :
Inf. & Commun. Theor. Group, Delft Univ. of Technol., Delft, Netherlands
fYear :
2004
fDate :
6-10 Sept. 2004
Firstpage :
1757
Lastpage :
1760
Abstract :
Quantization of sinusoidal model parameters is of importance in e.g. low-rate audio coding. In this work we introduce entropy constrained unrestricted spherical quantization, where amplitude, phase and frequency are quantized dependently. We derive a high-rate approximation of the average ℓ2-distortion and use this to analytically derive formulas for optimal spherical scalar quantizers. These quantizers minimize the average distortion, while the corresponding quantization indices satisfy an entropy constraint. The quantizers turn out to be flexible and of low complexity, in the sense that they can be determined for varying entropy constraints without any iterative retraining procedures. As a consequence of minimizing the ℓ2-norm of the (quantization) error signal, the quantizers depend on both the shape and length of the analysis/synthesis window.
Keywords :
audio coding; distortion; entropy codes; iterative methods; minimisation; quantisation (signal); amplitude parameter quantization; audio signal processing; average ℓ2-distortion minimisation; entropy constrained minimization; entropy constrained unrestricted spherical quantization; entropy constraint satisfaction; entropy constraint variation; frequency parameter quantization; iterative retraining procedure; optimal spherical scalar quantizer; phase parameter quantization; sinusoidal model parameters quantization; Abstracts; Entropy; Programmable logic arrays; Quantization (signal);
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal Processing Conference, 2004 12th European
Conference_Location :
Vienna
Print_ISBN :
978-320-0001-65-7
Type :
conf
Filename :
7080154
Link To Document :
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