Adaptive noise cancelling arrangement, a noise reduction system

Details Adaptive noise cancelling arrangement, a noise reduction system Adaptive noise cancelling arrangement, a noise reduction system

1996-12-11

1998-04-14

Isen, Forester W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

455570, H04B 1500

Patent

active

057402566

ABSTRACT:
A known cross-coupled adaptive noise cancelling arrangement uses an adaptive noise filter and an adaptive cross-talk filter in a feedback loop for cancelling correlated noise at a primary signal input and reference input. This known cross-coupled ANC does not operate satisfactorily, particularly not for acoustic noise cancellation. This leads to reverberant-like sound signals, in particular in a typical office room with remote noise sources. A different configuration of a cross-coupled adaptive noise cancelling arrangement gives rise to a better performance. The adaptive cross-talk filter is now split into a pre-filter section and an adaptive filter section, the sections using different input signals. The pre-filter section estimates the desired signal from the input signal of the noise cancelling arrangement, and the adaptive filter section has its input coupled to the output of the noise cancelling arrangement, a delay section being provided between the input and the output of the noise cancelling arrangement. In an embodiment, the pre-filter section and the adaptive filter section are separate filters.

REFERENCES:
patent: 5033082 (1991-07-01), Eriksson et al.
patent: 5473701 (1995-12-01), Cezanne et al.
patent: 5581495 (1996-12-01), Adrins et al.

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