| 摘要 |
The system uses a small probe assembly (50) containing a sound source (24,52,54), acoustic energy detector, such as microphone (30,52,56) inserted into the ear, acoustic calibration waveguide, stimulus signal generator coupled to the acoustic source, and signal processor which receives the set of detected calibration electrical signal from the acoustic energy detector when probe is positioned in the acoustic calibration waveguide. The linear responses, or transfer functions include reflectance, admittance and impedance. The calibration procedure is based on measured pressure responses in one or more calibration waveguides (60), and upon a model of transfer function of each of the calibration waveguides. The linear responses are established by measuring the transfer functions at different levels of acoustic stimulus. By applying changes in static pressure to the ear through an additional probe tube (68,70) in the probe assembly, the system measures the dependence on static pressure of any linear or nonlinear power based functions. |
