Acoustic impedance 1 Acoustics 1 Asymptotic estimates 1 Asymptotic solutions 1 Discrete mathematical models 1 Errors 1 Finite difference method 1 Finite difference model 1 Frequency domain analysis 1 Frequency independent 1 Head related transfer function 1 Regression analysis 1 Reliable assessment 1 Solution verification Transfer functions 1 Wave equations 1 acoustics 1 article 1 human 1 impedance 1 leaf pinna 1 quantitative analysis 1 reliability 1 simulation 1 systematic review 1 uncertainty 1