Experiments and analysis of bone conduction effect of real human head

Based on the principle of OtoAcoustic Emissions (OAE) and the method of three- interval paradigm separation, a method of applying swept tone to bone transducer is proposed to obtain the full frequency of Stimulus Frequency OtoAcoustic Emissions (SFOAE) quickly and accurately. In order to study the bone conduction effect of the head of real person, the relative relationship between the measured OAE signal and the stimulus signal of bone transducer is defined as OtoAcoustic related Bone Conduction Response Function (OAR-BCRF). The results of OAR-BCRF experiment on 10 normal hearing subjects showed that the envelope shape of OAR-BCRF measured under different stimulus levels had no significant difference, only the amplitude showed gradual elevations as the stimulus level increased; the overall trends of OAR-BCRF envelope at mastoid and mandibular condyle were similar, but there were differences in different frequency bands, and the transcranial transmission of the mandibular condyle was lower than that of the mastoid. The mean OAR-BCRF data showed that the maximum difference of OAR-BCRF amplitude was 13 dB on the ipsilateral side and 19 dB on the contralateral side between 2 kHz and 6 kHz. The OAR-BCRF envelopes of ipsilateral and contralateral sides were similar, and the isolation of bilateral bone conduction was not significant. The OAR-BCRF study in this paper effectively discusses the physiological characteristics of bone conduction transmission in real person, which can provide the basis for related research such as transcranial attenuation and spatial acoustic localization of bone conduction.