Linear microphone array for acoustic impulse response measurements using reciprocal method: Effects of microphone holder

Abstract

This article describes a linear microphone array used for measuring head-related impulse responses simultaneously at various radial distances using the reciprocal method. The microphone array consists of miniature 5.8 mm diameter electret condenser microphones (ECMs) arranged on a boom, using a 3D printed microphone holder with pillars. The frequency response of the ECM with the 1 mm thick band holder increased monotonically above 5 kHz and was 2 dB higher at 20 kHz compared to the frequency response of the bare ECM. When multiple ECMs were arranged on a boom at 200 mm intervals using microphone holders with a 3 mm diameter pillar, reflections from the pillar and boom were negligible, regardless of whether the height of the ECM from the boom was 30 mm or 60 mm.