False cord phonation - Laryngopedia

Making voice by vibrating the false vocal cords. This kind of phonation is unlike normal phonation or voice-making, which uses the true vocal cords.

False cord phonation produces a much deeper, rougher voice quality than normal phonation. It is purposefully used in certain kinds of vocal performance, such as Tibetan chant or heavy metal screaming. It can also occasionally serve as an alternate voice for a person whose true cords are unable to vibrate—due, for example, to their surgical removal or to scarring. It can also be produced concurrently with true cord phonation to produce a “Louis Armstrong” effect.