Digital Filtration of an Audio Signal to Minimize the Resonances in the Room Acoustic Response

The quality of an audio signal reproduction in the room is depending on many factors. Since the CD audio has become standard, the audio devices have to provide high quality reproduction. In comparison with video playback, where the lower resolution and frame rate is often satisfactory for the user, very high standards are expected in audio products area. High performance of the modern consumer electronics assures the sufficient quality of the digital-to-analogue conversion even in the lower-price segment of the players. The differences between various products are brought on especially by terminal amplifiers. The very significant influence on the audio reproduction have loudspeakers and acoustical qualities of the audition room of which the reflections and resonance are most problematic. Overall audio device quality is the matter of selection of the appropriate product, the improvement of a room response is then the ultimate task. The problems with resonance appear also in many other disciplines, we will investigate feed-forward techniques for their suppression which are applied in positioning and robotics.