Pulse or digital communications – Repeaters – Testing
Patent
1992-03-23
1994-05-10
Kuntz, Curtis
Pulse or digital communications
Repeaters
Testing
375122, 341200, 341 65, H04B 1404
Patent
active
053115490
ABSTRACT:
A method and a system process the pre-echoes of an audio-digital signal coded by frequency transformation. The method and the system, after transforming the signal by a frequency transform into transform coefficients y(k), over weighting windows formed over blocks of samples x(n) including N successive samples, and then quantizing the transform coefficients y(k), make it possible to perform, after decoding the transform coefficients y(k), an optimal filtering of KALMAN filtering type. When a transition in amplitude of the signal is present in the sample block, this KALMAN filter reduces the resulting additive noise arising from the quantization coding of the transform coefficients. The method and system may be used in the processing, storage and transmission of high-fidelity quality audio digital signals.
REFERENCES:
patent: 5079621 (1992-01-01), Daly et al.
Proceedings of the 25th IEEE Conference on Decision & Control: Dec. 1986, New York (US); pp. 116-112, Lindquist: "Use of Signal Processing Algorithms in microprocessor-based control".
Jayant & Noll, "Digital Coding of Waveforms" 1984. Prentice Hall, Englewood Cliffs (US).
Bocure Tesfaldet
France Telecom
Kuntz Curtis
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