The car's brakes produced a 'high-pitched' squeal.
She has a 'high-pitched' voice.
(..) We have to get out of here. You might want to speak in a lower register. What? Evolution has made women sensitive to high-pitched noises while they sleep so that they'll be roused by a crying baby. If you want to avoid waking her, speak in a lower register. (..)2007 TvShow: The Big Bang Theory Title: The Big Bran Hypothesis Season: 1 Episode 2