驗證網址www.sengpielaudio.com安全性

dBA weighting filter frequency to dBA and dBC dB(A) and dB(C) A weighted sound calculate DIN IEC 651

Also no dBC measured values can be converted to dBA values. The frequency composition of the signal is not known. Readings of a pure 1 kHz tone should be identical, whether ... The A-weighting filter curve is defined from 20 Hz to 20 kHz. This is intended...

網址安全性掃描由 google 提供


英現罕見陰陽蝶 生殖器官雌雄各半   英國倫敦自然歷史博物館近日有一隻「陰陽蝶」誕生,特別的是竟然連生殖器官都是雌雄各半的連接在一起,蝴蝶愛好者Luke Brown表示,純雙邊雌雄嵌體(bilateral gynandromorphs)非常罕見,在30年的職業生涯只有遇到過3次。 ...

全文閱讀