infrasound
/ˈin-frə-ˌsau̇nd/ (ame, mw)
infrasound — 名詞
1. Sound that exists as pressure waves at frequencies too low for the human ear to
次聲波
頻率低於人耳聽覺範圍的聲音
Sound that exists as pressure waves at frequencies too low for the human ear to detect, typically below about 20 hertz, though it can sometimes be felt as a physical vibration rather than heard.
Hassan learned that elephants use infrasound to communicate across distances of up to ten kilometres.
Hassan 學到，大象會利用次聲波在長達十公里的距離外互相溝通。
use infrasound to communicate [across distance]
The volcano monitoring station detected strong infrasound signals three hours before the eruption.
火山監測站在噴發前三小時便偵測到強烈的次聲波訊號。
detect infrasound signals from [natural source]
Residents near the wind farm blamed the infrasound from the turbines for their headaches.
風力發電機附近的居民認為，渦輪葉片產生的次聲波是他們頭痛的原因。
Qing's research team placed infrasound sensors along the coast to track approaching tsunami waves.
Qing 的研究團隊在海岸線安裝了次聲波感測器，用來追蹤即將到來的海嘯波浪。
The cinema installed special panels to reduce infrasound leakage into neighbouring rooms.
電影院加裝了隔音板，以減少次聲波滲透到隔壁的房間。
- low-frequency sound
more general term that can include audible low frequencies as well as those below the hearing range
- sub-audible sound
less common; emphasises that the sound cannot be heard, whereas infrasound is defined by frequency range
- ultrasound
sound waves at frequencies above the human hearing range, typically above 20,000 hertz
文法句型
infrasound + noun (infrasound waves / infrasound signals)
detect / produce / generate + infrasound
用法筆記
Frequently used as an attributive noun before another noun (e.g. infrasound waves, infrasound detection). Contrast with ultrasound, which refers to frequencies above the human hearing range. Infrasound is uncountable in standard scientific writing — use 'an infrasound signal' or 'a type of infrasound' rather than 'an infrasound' when a countable expression is needed.