How do Echo Devices Recognize the Wake Word?
Echo devices are designed to detect only your chosen wake word (Amazon, Alexa, Computer, or Echo). The device detects wake word by identifying acoustic patterns that match the wake word. Once the word is detected, audio begins streaming to the cloud, including a fraction of a second of audio before the wake word. No audio is stored or sent to the cloud unless the device detects the wake word (or Alexa is activated by pressing a button).
Which types of numbers Amazon Alexa not Supported?
Alexa app has awesome features and skills for you. You can easily make calls or messaging with Alexa. But Alexa calling doesn't support calls of the numbers - emergency service numbers, premium rate numbers, etc.
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