Moving formants and pitch can disguise voices while keeping speech intelligible

Evidence

Between pitch shifting and formant shifting, Praat can accomplish a very convincing gender transformation, although the female → male voice seems to work best. By moving formants and pitch around in other ways, voices may be disguised to hide the identity of the owner without compromising intelligibility. — Eric J. Heller, Why You Hear What You Hear- An…, 1726

Categorization

• XREF: Connects to voice disguise, speaker identification, and forensics; also to the mechanics of voice gender perception from earlier chapters on pitch and formants.