A Testing Method for Binaural Sensitivity to Sound Sources Under Different Sound Source Characteristics

When designing the layout of cockpit speakers and warning sounds for civil aircraft, it is necessary to consider the sensitivity of both ears to sound sources with different characteristics. Therefore, a method for testing binaural sensitivity to sound sources under various characteristics is proposed. The sound pressure time-domain signals collected by an artificial head and a single microphone under different sound source orientations and frequencies were obtained experimentally. The narrow-band spectrum analysis was performed on the two signals, and the narrow-band spectral difference was used as a sensitivity evaluation index to characterize the sensitivity of the binaural system to sound sources under different sound source characteristics. Different from traditional testing methods, the proposed method explores the impact of different frequency pure tones on the sensitivity of the binaural to sound sources. In addition, it improves the adjustment method of the relative position of the sound source and the artificial head, reducing the requirement for the free-field range of the anechoic chamber in such testing. Based on the analysis of the experimental results, the variation law of binaural sensitivity to sound source under different sound source characteristics are summarized, which has important guiding significance for the design of civil aircraft cockpit acoustic environment.