Acoustic Path Database for ANC In-Ear Headphone Development
* Presenting author
Active noise cancellation (ANC) for headphones is an emerging field with growing interest in consumer applications. Developing such an ANC system involves modeling the system from measurements, designing the algorithms and simulating the performance before building a real-time system. Modeling the system considers the transfer functions between loudspeaker and microphones, called secondary and feedback path, as well as the transfer function between the microphones, called primary path. These paths are modeled with varying degrees of accuracy in the development process: From coarse physical models, e.g., with pure delay; over measured paths under ideal conditions, called nominal; to considering uncertainty due to various operating conditions.We saw of a lack of publically available measured paths of ANC headphones. Hence, this publication describes an alongside published database containing two measurement sets of the Bose QC20 in-ear headphone without ANC electronics. The first set contains primary, secondary and feedback paths of 23 subjects measured in an acoustic booth. The second set contains primary paths measured for equally distributed directions on a horizontal plane. Measurements were done in a semi-anechoic chamber with a dummy head. The database can be used to consider inter-person differences and direction-of-arrival dependency in algorithm design and simulation.