Adaptive noise level estimator

Details Adaptive noise level estimator Adaptive noise level estimator

2005-01-11

2005-01-11

Harvey, Minsun Oh (Department: 2644)

Electrical audio signal processing systems and devices

Noise or distortion suppression

C704S226000

Reexamination Certificate

active

06842526

ABSTRACT:
A process for determining an estimated value for the noise level n of a background noise superimposed on an acoustic useful signal is characterized in that the estimated value n(x) for a sampled input signal x(k) is defined as a value n1(x) which is determined by means of the minimum value of the quantity of all the successive maximum values of the input signal x(k) in each case found within a short time interval ts≧1 ms; that the value n1(x) is adopted as estimated value n(x) for the current noise level n when the dynamic variations of the input signal x(k) undershoot a threshold value ∈; and that otherwise the estimated value determined in the preceding step is adopted unchanged as new estimated value n(x). In this way it is possible to achieve an extremely exact determination of the current noise level with very fast adaptation times which are considerably shorter than in known processes, with the need for only a relatively small computation outlay.

REFERENCES:
patent: 3855423 (1974-12-01), Brendzel et al.
patent: 4000369 (1976-12-01), Paul et al.
patent: 4885790 (1989-12-01), McAulay et al.

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