Respeecher was reused in Obi-Wan Kenobi for Darth Vader, presumably due to James Earl Jones, who was 91 years old during production, being too old to perform the character's menacing voice on his own note Jones' Role Reprises as Vader in Star Wars Rebels and Rogue One sounded noticeably worn, and those instances were nearly a decade before production on Obi-Wan began. This was carried forward with The Book of Boba Fett. voice simulator called Respeecher to compose new lines for the character using archival samples of Mark Hamill's voice in the 70s and 80s, as the real Hamill's voice changed significantly since the Return of the Jedi days.
In The Mandalorian season finale, Luke Skywalker's voice is this, using an A.I. The person with Locked-In Syndrome in Scrubs. The Mechonoids in "The Chase" have very peculiar voices created by cutting up a tape of a human voice actor until it is just phonemes, a sort of analog Vocaloid. They look like tin cans, but they have some powerful emotion inside them. A truly mechanical voice would probably be one-note-just-like-this, but Daleks have a cadence to their voices, and they also go "EX-TER-MI-NATE! EX-TER-MI- NAAAAATE!" with each intonation rising in pitch and volume. The Daleks, also, do not have mechanical voices, only voices that sound mechanical. The 2009 revival version of the Cybermen simply had an actor's voice run through a ring modulator with a different setting to what was used for the Daleks. The BBC did the Cyberman voices for most of the 1960s by having a human actor use an electrolarynx (an artificial throat-vibrating device for people who had lost their larynx to cancer or injury - they're rarely heard nowadays, but a prominent fictional user is Ned in South Park). The initial creepy sing-song voice of the Cybermen in "The Tenth Planet" was created by (human) voice actors imitating the glitchy speech cadences of the first ever 'singing' computer, IBM 704. Record your voice with Dalek speech-patterns, over-amplify it to add clipping distortions (this step is the one people often forget or don't know about, including, occasionally, the actual BBC effects people), then run the results through a ring modulator plugin using 20-40Hz for the frequency of the modulation. It's actually pretty easy to duplicate the Dalek voices. The BBC originally considered doing this for the Daleks, but with 1963 technology, they could have done only 45 seconds of dialogue this way, so they used a human voices filtered through a ring modulator. #Bee simulator voice actors series
The Cylons in the 1978 original Battlestar Galactica series spoke this way (human actors run through a synthesizer).