Robust single- and multi-loudspeaker least-squares-based equalization for hearing devices

Abstract To improve the sound quality of hearing devices, equalization filters can be used to achieve acoustic transparency, i.e., listening with device in ear is perceptually similar open ear. The filter needs ensure that superposition equalized signal played by and leaking through into canal matches a processed version reaching eardrum Depending on processing delay device, comb-filtering artifacts occur due this superposition, which may degrade perceived quality. In paper, we propose unified least-squares-based procedure design single- multi-loudspeaker for devices aimed at achieving transparency. account non-minimum phase components, utilize so-called group compensation. reduce artifacts, use frequency-dependent regularization. Experimental results using measured transfer functions from earpiece show proposed robust transparency reduces impact artifacts. A comparison between shows both cases performance achieved different desired functions.