Calibration method and apparatus for ear plug type transducer for ear acoustic emission audition detection

Abstract

The invention discloses a calibrating device of an ear-plugging type energy transducer used for otoacoustic emission hearing detection. The calibrating device comprises an artificial ear, a sound pressure meter, a digital-analog converting device, an analog-digital converting device and a computer. The artificial ear is used for simulating the average acoustic characteristics of normal human ears and comprises an acoustic couple resonator and a standard microphone which is connected with one end of the acoustic couple resonator; the sound pressure meter is connected with the standard microphone of the artificial ear and is used for measuring an electrical signal produced by the standard microphone and converting the electrical signal into a sound pressure value; the digital-analog converting device is used for providing the electrical signal for detecting a loudspeaker of the energy transducer to be detected; the analog-digital converting device is used for collecting the electrical signal output by the microphone of the energy transducer to be detected; and the computer is connected with the digital-analog converting device and the analog-digital converting device. The device can complete the sensitivity calibrating work of the loudspeaker and the microphone in a process, thus being more convenient and quicker; besides, the sensitivity of the sound pressure is measured as to the microphone.

Description

technical field [0001] The invention belongs to the technical fields of electronics and electro-acoustics, and in particular relates to a calibration device and method for an ear-plug type transducer used for otoacoustic emission hearing detection Sensitivity in the application of acoustic emission hearing testing. Background technique [0002] Otoacoustic Emission (OAE) detection is a hearing detection method, mainly the detection of evoked otoacoustic emissions (evoked OAE, EOAE), which requires the transducer used for detection to be placed in the external auditory canal, and has a stimulus Acoustic and receive the function of otoacoustic emission sound signal, so the transducer should contain at least one speaker and one microphone. [0003] Sensitivity calibration of loudspeakers and microphones needs to be performed in a silent room. In particular, the transducer should be connected to an artificial ear (or human ear simulator) that simulates the average acoustic cha...

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Problems solved by technology

[0004] For the application of otoacoustic emission hearing detection, the calibration of the speaker must follow the national standard GB9396, but also follow the GB7341 series of standards; and the calibration of the microphone, that is, the measurement of the sound pressure sensitivity when the microphone is placed in the external auditory canal of the human ear, the current national standard (GB9401) and the relevant content of the international standard (IEC268-4) are to be determined. At present, the free field comparison method is mostly used for measurement, and the measurement at this time is not strictly sound pressure sensitivity

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