The pitch-raising procedure – the feminization of the voice – is called glottoplasty.
There is a substantial difference in the pitches of the voices of men and women. Women who find their own speaking voice too low for comfort and transwomen (male-to-female transsexuals) may want to raise the pitch of their voice.
Various pitch-raising procedures are available. Some are performed under local anesthesia, and some under general anesthesia. The choice of procedure depends on whether the patient wishes to raise the pitch of their voice slightly (a woman who wishes to get rid of a low bass voice) or to achieve a substantial change in pitch (e.g. when a male larynx is adjusted – “tuned,” in a way – to produce a female voice).