def impedance_delany_and_bazley(frequency, flow_resistivity):
    return 1.0 + 9.08 * (1000.0*frequency/flow_resistivity)**(-0.75) - 1j * 11.9 * (1000.0*frequency/flow_resistivity)**(-0.73)
Normalised specific acoustic impedance according to the empirical one-parameter model by Delany and Bazley.
dataset/ETHPy150Open python-acoustics/python-acoustics/acoustics/reflection.py/impedance_delany_and_bazley