Modified LMS algorithms for robust ADPCM

Author

Pesquet, J.C. ; Tziritas, G. ; Macchi, O.

Author_Institution

Lab. des Signaux et Syst., ESE, Gif-sur-Yvette, France

fYear

1990

fDate

3-6 Apr 1990

Firstpage

1405

Abstract

The robustness of adaptive differential pulse code modulation (ADPCM) systems versus transmission errors is addressed. To secure the stability of the decoder, it is necessary to modify the form of the LMS (least-mean-square) algorithm used to adapt the predictor. Solutions introducing soft constraints are investigated. The leakage algorithm is proved to be not fully satisfactory, and a new stabilizing algorithm is presented that makes it possible to achieve good performances. Compared to existing methods, the main advantage of this algorithm is its low computational complexity. Form a theoretical point of view, the effect of transmission errors is described by a set of nonlinear recurrent equations. An analysis is carries out in the deterministic second-order case

Keywords

computational complexity; filtering and prediction theory; least squares approximations; pulse-code modulation; adaptive differential pulse code modulation; deterministic second-order case; leakage algorithm; low computational complexity; modified LMS algorithm; modified least mean square algorithm; nonlinear recurrent equations; predictor; robust ADPCM; soft constraints; stabilizing algorithm; transmission errors; Computational complexity; Decoding; Image coding; Least squares approximation; Modulation coding; Nonlinear equations; Pulse compression methods; Pulse modulation; Robustness; Stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on

Conference_Location

Albuquerque, NM

ISSN

1520-6149

Type

conf

DOI

10.1109/ICASSP.1990.115652

Filename

115652