2018/11/08 by Søren Jønsson, Jønsson, Søren, Andreas Schuhmacher +3
Computer Science · Engineering · Medicine · Neuroscience · #Acoustic Wave Phenomena Research #Applied Physics (physics.app-ph) #Ear Surgery and Otitis Media #FOS: Physical sciences #Hearing Loss and Rehabilitation #Speech and Audio Processing
paper · pdf · doi:10.48550/arxiv.1811.03342
openalex publication_date 2018/11/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The multimedia evolution has led to increased audio signal bandwidth in new\ngenerations of smartphones, headsets, headphones, as well as hearing aids. Full\naudio bandwidth performance, up to 20 kHz, is required. This calls for wider\nband performance of the ear simulators, and head and torso simulators used by\nthe industry to evaluate these multimedia devices, as well as a better\nunderstanding of the high frequency behaviour of the human ear that these\nsimulators are supposed to replicate. Acoustic input impedance measurements are\nan important parameter when characterizing small complex cavities such as ear\nsimulators and the human ear. Today, this is well covered up to around 8-10\nkHz. In this study a calibration procedure for measuring wideband impedance is\ndeveloped, that uses multiple reference loads each defined by a detailed\nsimulated impedance, in order to increase the applicable frequency bandwidth of\nthe measurements. Comparing measured impedance magnitude, calibrated with this\nnew procedure, to detailed simulations on a widely used ear simulator (IEC711\ncoupler) shows good agreement in the full audio bandwidth. Furthermore, the\ncalibration procedure is streamlined to make it suited for a larger scale\nimpedance study of the human ear, and measurements in one human ear is\npresented.\n