Vorrichtung zur Kompensation der akustischen Rückkopplung bei einem System zur aktiven Geräuschminderung

摘要

The structural model of the disclosed acoustic feedback compensating device for an active sound dampening system shows, according to a representation used in the regulation technique, a block (234) having the transmission function Hp(z) of the acoustically disturbed space. Block (243) represents the transmission function of the acoustic feedback HFB(z) that reigns between the secondary sound source and the reference sensor in the space and falsifies the reference signal x(k) at point (23). Block (210) represents the transmission function G(z) of the adaptive regulator. A(z) and B(z) represent the filter functions of digital filters (201) and (202) that together behave like an Infinite Impulse Response filter. Block (220) represents function HFB(z) of the path of propagation model (220) or of the reference path of propagation connected antiparallel to the regulator (210). Acoustic feedback is electrically compensated by connecting the path of propagation model (220) with a negative sign on the input of the adaptive regulator (210). The destructive superimposition of the disturbing sound d(k) and the compensating sound y(k) at point (25) of the error sensor gives the error signal e(k) that is transmitted as an input signal to the adapting input of the regulator (210).