ACTIVE SUPPRESSION OF AUDIO NOISE Russian patent published in 2015 - IPC G10K11/178 

FIELD: physics, acoustics.

SUBSTANCE: invention relates to active acoustic noise suppression means. A noise suppression system comprises a microphone which generates a detected signal and an audio converter which emits an audio signal for suppressing audio in an audio environment. The system also includes a feedback circuit from the microphone to the audio converter, comprising a non-adaptive suppression filter and variable gain. A noise suppressor comprises a gain detector which determines secondary path gain for at least part of the secondary path in the feedback loop. The secondary path may include a microphone, an audio converter and an acoustic path in between, but does not include a non-adaptive suppression filter or variable gain. A gain controller controls gain at the variable gain in response to secondary path gain.

EFFECT: high efficiency of noise suppression.

15 cl, 7 dwg