1.
natural voice; one's normal speaking voice
A person's natural, unmodified voice, as opposed to a deliberately altered or affected voice.
彼女は地声が大きい。
She has a naturally loud voice.
電話と地声が全然違う人がいる。
Some people sound completely different on the phone than in person.
地声が低いから、カラオケで女性の曲は歌いにくい。
My natural voice is low, so it's hard to sing female songs at karaoke.
2.
chest voice (singing)
In singing terminology, the natural lower register produced by the chest resonance, as opposed to falsetto or head voice.
あの歌手は地声で高い音まで出せる。
That singer can hit high notes in their chest voice.
地声が低いから、カラオケで女性の曲は歌いにくい。
My natural voice is low, so it's hard to sing female songs at karaoke.
地声から裏声への切り替えが上手な歌手だ。
That singer is skilled at switching from chest voice to falsetto.
地声の音域を広げるためにボイストレーニングをしている。
I'm doing voice training to extend my chest voice range.
The word 地 here means "base" or "natural" (as in 地毛, natural hair color). Both senses share the core meaning of the unaltered, natural voice.
COMMON COLLOCATIONS:
- 地声が大きい: to have a naturally loud voice
- 地声が低い/高い: to have a naturally low/high voice
- 地声で歌う: to sing in one's chest voice
RELATED TERMS:
- 裏声: falsetto; head voice
- 作り声: affected voice; put-on voice
- 声色: voice imitation; vocal mimicry