| 摘要 |
The invention relates to a method and a system for the active reduction, at a predetermined area, of the energy of a sound signal (d<SUB>k</SUB>(n)), also called a diffused noise signal, generated at said area by a primary signal (x<SUB>k</SUB>(n)), or noise signal, by the emission of a plurality of counter-noise signals (y<SUB>k</SUB>(n)) having an effect antagonistic to the diffused noise signal (d<SUB>k</SUB>(n)), each of said counter-noise signals (y<SUB>k</SUB>(n)) including a feedback counter-noise signal (yfbk<SUB>k</SUB>(n)) and a feed-forward counter-noise signal (yfwd<SUB>k</SUB>(n)). The method of the invention comprises detecting the periodical components of diffused noise signal (d<SUB>k</SUB>(n)) for adjusting the feedback counter-noise signal (yfbk<SUB>k</SUB>(n)), and modelling the inverse of the secondary path for adjusting the feedback counter-noise (yfbk<SUB>k</SUB>(n)) and feed-forward counter-noise (yfwd<SUB>k</SUB>(n)) signals. The invention can be implemented to any type of industrial or non-industrial noise and in any location such as working places and relaxation places. |
