Title :
On noise propagation in closed-loop linear predictive coding
Author :
Kruger, Heinrich ; Geiser, Bernd ; Vary, Peter
Author_Institution :
Inst. of Commun. Syst. & Data Process. (ind), RWTH Aachen Univ., Aachen, Germany
Abstract :
A new noise production and propagation model for open- and closed loop linear predictive coding (LPC) is proposed in this paper. The model allows to accurately predict the overall SNR even at lower bit rates where the conventional high rate theory fails. Moreover, a source of LPC encoder instabilities is pointed out which is due to the interaction between the quantizer and the (filtered) feedback of the quantization error. The new model is verified by measurements.
Keywords :
linear codes; quantisation (signal); LPC encoder instabilities; bit rates; closed-loop linear predictive coding; noise production model; noise propagation model; open-loop linear predictive coding; overall SNR prediction; quantization error feedback; quantization error quantizer; Bit rate; Encoding; Gain; Noise shaping; Quantization (signal); Signal to noise ratio; linear predictive coding; quantization;
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2014 IEEE International Conference on
Conference_Location :
Florence
DOI :
10.1109/ICASSP.2014.6854290
