This thesis proposes a novel robust approach based on digital filtering to solve
the described problems. A combination of feedback and feedforward filter design
allows for either approaching personal silence or a natural perception of one’s own
voice and the acoustic environment.
The main contributions are:
• Novel design concept for ANC / OEC systems which are robust w.r.t. acoustical
variations of ear canals and earpiece fittings
• Novel structure for combined feedforward-feedback filters with adaptive
stability control
• Analysis of variability of acoustic front-end (headset) as well as electronic
back-end (digital signal processing incl. AD/DA-conversion) and implications on ANC/OEC performance
• Real-time implementation of algorithms on a PC-sized dSPACE system as
well as a mobile integrated circuit (Analog Devices ADAU 1777)
• Objective instrumental and subjective auditive evaluation of the concepts