| 摘要 |
PURPOSE:To enable the quantitative measurement of human body influence quantity, by separating and extracting a sound pressure component from the output of an air vibration detector at every neighboring region corresponding to various factors of human body sensation and performing weighting corresponding to the contribution ratio to various factors to add said sound pressure component. CONSTITUTION:Band pass filters 3a-3m are connected to an air vibration detector 1 capable of detecting sound from audible sound to low frequency sound through an amplifier 2 and the output of the air vibration detector 1 corresponding to sound pressure is separated into sound components A1-Am at every proper number of required bands and said components A1-Am are extracted while weighting is performed corresponding to a sound level by non-linear type operators 4a-4m. Next, operational amplifiers 5a-5m are connected to the operators 4a-4m and predetermined weighting coefficient is multiplied to said sound pressure components A1-Am while the weighted components are added and an analogue amount is calculated by non-linear type operators 6a-6m and an operational amplifier 7 to enable display. At this time, for example, contribution ratios to an oppresive sensation, a vibration sensation and a hearing sensation respectively predominate at 10Hz or less, 10-20Hz and 20Hz or more and, with due regard to this, weighting coefficient is determined. |
