Abstract
Purpose of research: We are developing and researching a BJAS device that senses bioacoustic information of health care related to the longevity of bipedal walking. BJAS-Bone joint acoustic sensor: We are developing a bioacoustic sensor that measures and diagnoses knee joint misalignment, lower limb balance decline, and lower limb muscle strength decline. Background: The number of elderly people who have difficulty walking due to longevity is increasing rapidly. The number of people requiring support and long-term care is increasing, and wasteful spending is increasing. Countermeasures: Building a body with a long walking life, developing an early walking diagnostic device, and its preventive effect will improve walking life. This report: We have developed an acoustic signal generator to test the performance of BJAS. The transfer function of this device was investigated. Transfer function: Gas transfer system and solid transfer system are set, and the input signals are sine sweep and random noise, frequency response function (FRF) and coherence function (Coh.). Result: The transfer function of each system is determined by the magnitude of the input signal, the attenuation of the system, and the eigenvalues of the signal generator. We were able to quantify the frequency characteristic PS of this signal transmission system. Conclusion: Although some corrections were found, this signal generator had sufficient functions for use in calibrating bioacoustic sensing devices.
