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PlainTalk is the collective name for several speech synthesis (MacinTalk) and speech recognition technologies developed by Apple Inc. In 1990, Apple invested a lot of work and money in speech recognition technology, hiring many researchers in the field. The result was "PlainTalk", released with the AV models in the Macintosh Quadra series from 1993. It was made a standard system component in System 7.1.2, and has since been shipped on all PowerPC and some 68k Macintoshes.
Apple's text-to-speech uses diphones. Compared to other methods of synthesizing speech, it is not very resource-intensive, but limits how natural the speech synthesis can be. American English and Spanish versions have been available, but since the advent of Mac OS X, Apple has shipped only American English voices, relying on third-party suppliers such as Acapela Group to supply voices for other languages (in OS X 10.7, Apple licensed a lot of third-party voices and made them available for download within the Speech control panel).
An application programming interface known as the Speech Manager enables third-party developers to use speech synthesis in their applications. There are various control sequences that can be used to fine-tune the intonation and rhythm. The volume, pitch and rate of the speech can be configured as well, allowing for singing.
Input to the synthesizer can be controlled explicitly using a special phoneme alphabet.
The initial Macintosh text-to-speech engine, MacinTalk (named by Denise Chandler), was used by Apple in the 1984 introduction of the Macintosh in which the computer announced itself to the world (and poked fun at the weight of an IBM computer). While it was incorporated into the Macintosh's operating system, it was not officially supported by Apple (though programming information was made available through an Apple Technical Note). MacinTalk was developed by Joseph Katz and Mark Barton who later founded SoftVoice, Inc. which currently markets TTS engines for Windows, Linux and embedded platforms. Macintalk used direct access to the original Macintosh sound hardware and all attempts to license the source code by Apple to update it for newer Macs failed.  
Eventually, Apple released a supported speech synthesis system, called MacinTalk 2. It supports any Macintosh running System Software 6.0.7 or later. It remained the recommended version for slower machines even after the release of MacinTalk 3 and Pro.
MacinTalk 3, Pro
MacinTalk 3 introduced a great variety of voices. Apart from the standard adult voices "Ralph", "Fred" and "Kathy", and children's voices like "Princess" and "Junior", various novelty voices were included, like "Whisper", "Zarvox" (a robotic voice with melodic background sounds, with a similar voice called "Trinoids" also included), "Cellos" (a voice that sang its text to an Edvard Grieg tune, with similarly singing voices like "Good News", "Bad News", "Pipe Organ"), "Albert" (a hoarse-sounding voice), "Bells", "Boing", "Bubbles", and others.
Each of these voices came with its own example text, that would be spoken when one hit the "Test" button in the Speech control panel. Some would just say their name, language and the version of MacinTalk they were introduced with. Others would say funny things, like "I sure like being inside this fancy computer", "I have a frog in my throat... No, I mean a real frog!", "We must rejoice in this morbid voice" (a parody of Western church hymnody with organ music), or "The light you see at the end of the tunnel is the headlamp of a fast approaching train". These voices as well as their test texts are still in Mac OS X today.
With the increase in computing power that the AV Macs and PowerPC based Macintoshes provided, Apple could afford to increase the quality of the synthesis. MacinTalk 3 required a 33 MHz 68030 processor and MacinTalk Pro required a 68040 or better and at least 1 MB of RAM. Each synthesizer supported a different set of voices.
Text-to-speech in Mac OS X
Text-to-speech has been a part of every Mac OS X (later macOS) version. The Victoria voice was enhanced significantly in Mac OS X v10.3, and added as Vicki (Victoria was not removed). Its size was almost 20 times greater, because of the higher-quality diphone samples used.
The Speak selected text when key is pressed feature allows selected text from any application to be read via a key combination. From Mac OS X 10.1 to Mac OS X 10.6, the feature would copy the selected text to the clipboard and read it from there. From Mac OS X 10.7 to Mac OS X 10.10, a new implementation of the feature required software developers to implement a speech synthesis API into their applications. This prevented the clipboard from being overwritten, but also meant that, for applications that did not use the API, the feature would not function as expected, reading the title bar rather than the selected text.
In macOS Sierra 10.12, Siri was introduced for the Mac, however, the voice wasn't available as a System Voice, which meant that the Siri voices could be only used in Siri. Siri was made available as a System voice in macOS Catalina 10.15, so that it would work for any text. The Siri voices work in a completely different way and the
say command remains unable to use Siri.
Apple hired many speech recognition researchers in 1990. After about a year, they demonstrated a technology codenamed Casper. It was released as part of the PlainTalk package in 1993. Although available for all PowerPC Macintoshes and AV 68k machines (it was one of the few applications that made use of the DSP in the Centris 660AV and Quadra 840AV), it was not part of the default system install prior to Mac OS X, requiring the user to perform a custom OS installation to get speech recognition capabilities.
In Mac OS X 10.7 Lion and earlier, Apple's speech recognition was voice-command oriented only, i.e. not intended for dictation. It can be configured to listen for commands when a hot key is pressed, after being addressed with an activation phrase such as "Computer", or "Macintosh", or without prompt. A graphical status monitor, often in the form of an animated character, provides visual and textual feedback about listening status, available commands and actions. It can also communicate back with the user using speech synthesis.
Early versions of the speech recognition provided full access to the menus. This support was later removed, since it required too many resources and made recognition less reliable, only to be re-added in Mac OS X 10.3 as a "universal access technology" called spoken user interface.
The user can launch items located in a special folder, called "Speakable Items", simply by speaking their name (while the system is in listening mode). Apple shipped a number of AppleScripts in this folder, but aliases, documents and folders can be opened in the same way.
Additional functionality is provided by individual applications. An application programming interface lets programs define and modify an available vocabulary. For example, the Finder provides a vocabulary for manipulating files and windows.
In OS X 10.8 Mountain Lion, Apple introduced “Dictation,” intended for general text. Originally, it required the sending of audio data to Apple servers for processing. In OS X 10.9 Mavericks, Apple added the option to download support for dictation without an Internet connection. As of OS X 10.9.3, eight languages (19 dialects) are supported.
In popular culture
The MacinTalk speech synthesis can be heard in a few radio programmes:
The MacinTalk speech synthesis can be heard in a few songs:
- MacinTalk's "Vicki" speaks during the breaks in Studio Killers' "In Tokyo."
- "Repeating Yesterday" from As I Lay Dying's Shadows Are Security album used MacinTalk in the intro.
- "Satisfaction" by Benny Benassi, as well as other songs by him.
- "Toby's Mac" by tobyMac, from his first album Momentum.
- MacinTalk's "Fred" is featured in the Radiohead songs "Paranoid Android" and "Fitter Happier", both off their 1997 album OK Computer. In the former song, Fred is used to provide background vocals, while in the latter he acts as the lead "vocalist."
- Fall Out Boy used MacinTalk at the beginning of "Grand Theft Autumn/Where Is Your Boy" (Millennium Version) and at the end of the last track and bonus tracks on their Infinity on High album.
- The French band Air uses several Macintosh voices in their track "How Does it Make You Feel"
- "Yoshimi Battles the Pink Robots, Pt. 1" by The Flaming Lips features the "Zarvox" voice
- Many Aphex Twin tracks including "Ventolin (Crowsmengegus Mix)", Funny Little Man" and "Cow Cud Is a Twin" also feature PlainTalk
- The song "John Orr the Arsonist" by And Then There Were None features a short monologue using this voice.
- "The Vic-E Interpretation - Interlude" from TLC's album FanMail features "Victoria" comparing and contrasting club culture in the US and Japan.
- The "Intro" from OutKast's Stankonia album features the "Bells" voice.
- The song "Pomme C" by French singer Calogero on the album Pomme C features a short monologue at the very beginning using the voice "Vicki"
- "DWYL" by Phil Joel
- The album Antichrist Superstar by the band Marilyn Manson makes repeated use of MacinTalk voices "Kathy", "Princess", and "Junior", often layered on top of each other. The album's title song ends with the MacinTalk voices repeating, "When you are suffering, know that I have betrayed you". MacinTalk voices are used again in the music video and live performances of "Antichrist Superstar". The MacinTalk voices repeat "You might as well kill yourself—you're already dead" at the end of the song. The song "Man That You Fear" also ends with MacinTalk voices saying, "When all of your wishes are granted, many of your dreams will be destroyed."
- Most of Mr Oizo's Transsexual EP and Lambs Anger album contains MacinTalk voices
- Korea Idol T-ara's song "Bo Peep Bo Peep" from the Absolute First Album introduction part 'Don't lose your temper so quickly'
- The El-P song "Stepfather Factory", from the 2002 album Fantastic Damage, ends with MacinTalk voices repeating, "Why are you making me hurt you? I love you".
- In EDM producer Skrillex's track titled "I Wish You All The Luck Of The World", the MacinTalk voice "Alex" can be heard repeating "David, I wish you all the luck in the world" several times in various pitches.
- Rob & Goldie's 1997 track "The Shadow (The Process Mix by Rick Smith for Underworld)" makes extensive use of the "Victoria" voice, reading a dictionary definition of "shadow" and a poem from the book Process: A Tomato Project.
- Jean-Michel Jarre's album "Métamorphoses" from 2000 uses MacinTalk to generate lyrics on the track "Love, Love, Love".
- The opening line of "Treasure" by Bruno Mars on the album Unorthodox Jukebox is the voice Alex saying, "Baby squirrel, you's a sexy motherfucker".
- In "Sometimes Things Get, Whatever" by deadmau5 from the album Random Album Title, the looped line, "Sometimes things get complicated" is a combination of the "Ralph" and "Kathy" voices.
- Electro house duo BSOD's (deadmau5 & Steve Duda) track "This is the Hook" uses the "Ralph" voice to signal different parts of a typical electronic music track.
- German electronic act Monolake uses the PlainTalk "Whisper" voice in the track "Bicom" on their album Cinemascope.
- Plogue Art et Technologie's virtual synthesizer chipspeech emulates MacinTalk 1.0.
- I'm A Disco Dancer (And A Sweet Romancer) by Christopher Just uses various MacinTalk voices
- David James uses some MacinTalk voices in his song (Always) A Permanent State
- The "Ralph" voice serves as the voice of the computerized autopilot AUTO in the 2008 Disney-Pixar film WALL-E. MacinTalk is credited as that voice in the film's end credits.
- In Blank Check, Preston used MacInTalk as the Voice of M.Macintosh to buy a house over the phone.
- The "Fred" voice is used in the 2021 Sony Pictures Animation film The Mitchells vs. the Machines for the robot vacuums that appear in the film.
- MacinTalk was used to perform the part of the wheelchair-using motor neurone disease patient with a voice synthesizer in the animated Family Guy episode "Ready, Willing and Disabled", who would later appear again in "Brian the Bachelor" and "Brian Goes Back to College". It was furthermore used in "Peterotica", when Stewie plays with "the speech function on his Macintosh", Using Talking Moose software, Stewie gets his laptop to say "Stewie is cool." It was also in "April in Quahog", where MacinTalk Fred voices Stephen Hawking.
- The voice "Whisper" was used to introduce episodes on Serial Experiments Lain, and in the eyecatches for Boogiepop Phantom. Both anime featured Yōta Tsuruoka as the sound director.
- In the early years of Adult Swim, a pitched down "Junior" voice was used as the announcer for the former "Adult Swim Action" block.
- In the Transformers: Animated episodes "TransWarped", "Decepticon Air" and "This is Why I Hate Machines", the Autobot Perceptor's voice was performed via MacinTalk speech generation, using the "Fred" voice.
- It was also used in the cartoon Whatever Happened to... Robot Jones? as the voice of Robot Jones' father, Dad Unit, and Robot in the first season.
- It was also used as the voice for the Red vs. Blue character, the lying A.I Gary/Gamma.
- The Mac OS X novelty voice "Boing" was used for the Robot face (SSF/Splaat) for Klasky Csupo.
- In one of Boomerang's older blocks Boomeraction, the voice used for the block was a low pitch version of the "Trinoids" novelty voice.
- In the Venture Bros episode "All This and Gargantua-2", the voice is used for the robots on the titular space station.
- It was used in Scrapheap Challenge Season 1 as the voice that announces the time remaining for the challenges.
- The "Junior" voice was used in the Wayside episode "Mad Hot."
- In Doki, the "Trinoids" voice was used in one episode called, "To Catch A Fish."
- The "Junior" voice was used once in Hi Hi Puffy AmiYumi in the episode "Mean Machine".
- The "Fred" voice was used in the Space Ghost Coast to Coast episode "Warren", and episodes 1 to 14 of Wonder Showzen.
- The "Junior" or "Kathy" and "Fred" voices can be heard in the theme song for Pickle and Peanut.
In video games
- MacinTalk was used in the Japanese version of the game Killer7, as the voices of the Remnant Psyches.
- MacinTalk was used in the game No More Heroes. Before each boss fight, the "Whisper" voice would announce the current boss's name.
- The video game series KKnD featured the MacinTalk voice "Zarvox" for the 21st century robotic units located in tech bunkers in both games.
- The original 1999 release of The Silver Case used "Ralph" and "Boing" in its intro track.
- The video game Grand Theft Auto IV used "Vicki" as the voice of the DJ of the in-game radio station "The Journey".
- The 2009 video game Machinarium features several Macintalk voices in its ambient music.
- The 3DO version of Star Control 2 used "Bruce" as the voice of the Slylandro Probe. The game credits the voice of the Probe as 840AV. "Agnes" was also used as the voice of the Captain's ship's computer, heard on the first encounter with the Orz race.
- The Japanese and European versions of Sonic CD used MacinTalk voices in the background music of Metallic Madness' Bad Future stages.
- The video game Castle Crashers used the novelty voice Boing, for a character known as The Painter.
- The 2003 video game Shin Megami Tensei: Nocturne used "Albert" for vocals in its soundtrack.
In web videos
- MacinTalk voice "Zarvox" was used to voice the robot in the Smosh video "AWESOME NEW ROBOT!", and the "Fred" voice was used to voice Stephen Hawking in "15 HOUR ENERGY!"
- YouTuber Max Gilardi used various Macintalk voices for his videos.
- The Making Fiends web series had a version of the episode "Kitty Kitty Kitty", where the original audio was replaced with a computerized speech simulator.
- The opening for Nitro Rad has the voice saying the words "Nitro Rad."
- The MTV Home Video logo from 1998 to 2010 uses the "Kathy", "Trinoids", and "Fred" voices.
Apple produced two microphones under the product name "Apple PlainTalk Microphone". The first shipped inclusive with Macintosh LC and early Performa models, and was circular in appearance. It was designed to sit in a holder attached to the side of a CRT display, and be lifted out and held by the mouth when talking. The second model was introduced alongside the AV models in the Macintosh Quadra series in 1993 but was also sold separately. It was designed to be positioned on top of the screen and to be sensitive to sound from the front. Both models had a longer connector, the tip of which was used to provide the microphone with bias voltage.
- Ginger Jernigan; Jim Reekes (June 1989) [April 1985]. "Technical Note #019: How To Produce Continuous Sound Without Clicking". Apple Computer Inc. Retrieved 18 September 2019.
- Jim Reekes (February 1, 1990). "Technical Note PT22, a.k.a. #268: MacinTalk—The Final Chapter by MacinTalk—The Final Chapter". Apple Computer Inc. Retrieved 18 September 2019.
The outcome of this work was MacinTalk. MacinTalk is a file that can be placed into the System Folder of an ordinary Macintosh computer and allow text to be transformed into speech for the introduction in 1984. It was felt to be an interesting piece of software, so Apple made it available to developers. Interfaces to MacinTalk were published and Apple Software Licensing allowed it to be included with developers’ products. The original project was to get a speech driver for the Macintosh, but it did not include obtaining the source code to this driver. Apple only has exactly what it gives to developers: a file to be copied into the System Folder, and this file cannot be changed since Apple does not have the source code. [The original] MacinTalk works by using a VBL task to write data directly to the sound hardware of the Macintosh Plus and SE logic boards—a method which Apple does not support. It has only been through the efforts of the Sound Manager that software that writes directly to this sound hardware continues to work. MacinTalk continues to write to the hardware addresses of the Macintosh 128K logic board, but the Sound Manager and the Apple Sound Chip work together to allow programs like MacinTalk to continue working on newer machines. The Sound Manager and the Apple Sound Chip [ASC] were introduced with the Macintosh II. The Sound Manager watches the hardware addresses that used to be present on the Macintosh. When the Sound Manager detects activity at one of these addresses, it goes into a “compatibility” mode. In this mode, it routes the data to the real sound hardware, but while this is happening, proper Sound Manager code cannot run—even the Sound Manager’s _SysBeep does not work when MacinTalk is in use. Furthermore, the compatibility mode cannot be turned off until the application requiring it calls _ExitToShell. Even an application that uses sound properly, with correct code, does not work if another application opens the MacinTalk driver. There are no solutions to this incompatibility.... In other words, if you find MacinTalk interesting and entertaining—go ahead and purchase it. Write some code and enjoy. However, be warned that MacinTalk should not be included as part of any commercial product. Apple Computer, Inc. provides no support for MacinTalk other than what is purchased with the package itself, and there will be no support in the future. Apple is committed to providing the developer community with an array of speech technologies integrated with the Sound Manager... Nothing more will be done [with the original MacinTalk]. It is a compatibility risk... causes the Sound Manager to fail... will not work with the new Sound Manager planned for System 7.0... may not work at all with future versions of the Macintosh hardware. ....#000: About Macintosh Technical Notes.... We place no restrictions on copying Technical Notes, with the exception that you cannot resell them, so read, enjoy, and share. We hope Macintosh Technical Notes will provide you with lots of valuable information while you are developing Macintosh hardware and software.Alt URL
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- Folklore.org: The Original Macintosh, about the Macintosh introduction
- API Documentation:
- MacinTalk at IMDb
- Technote TN 22 - Macintalk - The Final Chapter