Editing Casper The Voice Interface (section)

= Historical Context =
In the '''1970s''', the development of the [[wikipedia:Hidden_Markov_model|HMMs]]<ref>[[Hidden Markov Models]]</ref> system made the large vocabulary for continuous speech recognition models possible for voice technology development.

Building on the advancements made with HMMs, Casper revolutionized speech recognition technology, speech recognition technology which had to require users to pause between speaking each word before, such as the early version 1.0 of [[wikipedia:Dragon_Dictate|Dragon Dictate]]<ref>[[Dragon Dictate]]</ref>. The emergence of Casper changed this situation.

In the early '''1990s''', [[wikipedia:Apple_Inc.|Apple]], after assembling a team of speech recognition experts, initiated the development of Casper. By 1991, they had a working technology project known as Casper.

In '''1993''', the Casper technology became accessible through the [[wikipedia:PlainTalk|PlainTalk]] package. While it was compatible with all PowerPC Macintosh computers and AV 68k machines, it stood out as one of the rare applications that harnessed the [[wikipedia:Digital_signal_processor|DSP]] technology within the Centris 660AV and Quadra 840AV models.

However, it was not integrated into the standard system setup before the era of Mac OS X. To access its speech recognition capabilities, users needed to undertake a personalized OS installation.<ref>https://en.wikipedia.org/wiki/PlainTalk</ref>