If the score is high enough, Siri wakes up. It then uses a temporal integration process to compute a confidence score that the phrase you uttered was "Hey Siri". The "Hey Siri" detector uses a Deep Neural Network (DNN) to convert the acoustic pattern of your voice at each instant into a probability distribution over speech sounds. When it detects "Hey Siri", the rest of Siri parses the following speech as a command or query. ![]() A very small speech recognizer runs all the time and listens for just those two words. The "Hey Siri" feature allows users to invoke Siri hands-free.
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