Which linguistic innovation dramatically improved voice assistant accuracy around 2012, leading to their widespread retail adoption?

Voice assistants have transformed how we interact with technology, but their development relies heavily on linguistic expertise and natural language processing. Behind the polished interfaces of Alexa, Siri, and others lies a fascinating history of product development challenges in computational linguistics. This poll tests your knowledge about a pivotal moment in voice assistant technology that changed the retail customer experience forever.

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Deep neural networks for speech recognition
Rule-based grammatical parsing systems
Multilingual thesaurus integration
Phoneme-based voice synthesis technology