Method and apparatus for noise burst detection in a signal proce

Details Method and apparatus for noise burst detection in a signal proce Method and apparatus for noise burst detection in a signal proce

1992-01-15

1994-06-07

Harvey, Jack B.

Boots, shoes, and leggings

375 27, 375 34, 375 99, 375 76, 341143, G06K 940, H04B 1406, H04B 1500

Patent

active

053195736

ABSTRACT:
A signal processor such as an ADPCM decoder (28b) receives an input signal. As part of the CCITT Recommendation G.726 algorithm, ADPCM decoder (28b) processes the input signal to provide a linear reconstructed signal s.sub.r (k). When enabled, a noise detector (50) samples the reconstructed signal s.sub.r (k) once for each of a predetermined number of received samples. The noise detector (50) adds the absolute value of the reconstructed signal s.sub.r (k) to a total energy estimate. At the end of the predetermined number of samples, the noise detector (50) compares the total energy estimate to a product of a noise threshold and the predetermined number. If the total energy estimate exceeds this product, then a noise indication is provided. This calculation prevents the need for time-consuming division operation which is difficult for high-performance digital signal processors (70).

REFERENCES:
patent: 5259001 (1993-11-01), Carleto et al.
Nelson et al.; Title: "Digital methods for the detection of incipient fault conditions in spaceborne power systems"; 25th Intersociety Energy Conversion Engineering Conference 25th:1990; Nov.
Analysis Transmission and Filtering of Signals by Mansour Javid et al. (Textbook) pp. 109-105, 1981.

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