This room is covered with soundproofing material, so the sound doesn't leak outside.

He honked the car horn to get my attention.

Infrasound is a type of sound that is inaudible to the human ear.

Debuccalization refers to the phenomenon in phonetics where a specific sound is pronounced outside the oral cavity.

Kunminjōon is a book for teaching the correct pronunciation of Hangul.

Understanding the concept of 'Ha-line conversion sounds' is important in learning Japanese.