嗓音 (sǎng yīn) refers to the natural quality or sound of a person's voice — its timbre, pitch, and character. It is more specific than 嗓子 (sǎng zi), which can mean either 'throat' or 'voice', and unlike 语音 (yǔ yīn 'pronunciation') or 口音 (kǒu yīn 'accent'), it focuses purely on the vocal sound itself, not on how words are pronounced.