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Amazon’s Alexa is getting a more natural-sounding voice
September 21, 2023

Amazon’s Alexa is getting a more natural-sounding voice

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In addition to getting a generative AI-powered upgrade, and the ability to continue conversations without again using the wakeword ‘Alexa,’ Amazon’s voice assistant is going to gain a more natural-sounding voice. The company introduced today an updated ‘speech-to-speech’ engine that’s now more context-aware of the user’s emotions and the tone of your voice, which then allows Alexa to respond with a similar emotional variation in its output.

The company demoed the new voice which offered a less robotic-sounding Alexa, which included more expressiveness — something the company noted was powered by large transformers that were trained on different languages and accents.

For example, if a customer asked for an update about their favorite sports team and they had won the latest game, Alexa would be able to respond with a joyful voice. If they had lost, however, Alexa would sound more empathetic.

‘And we’re working on a new model — which we refer to as speech-to-speech — again powered by massive transformers. Instead of first converting a customer’s audio request into text using speech recognition, and then using an LLM to generate a text response or an action, and then text-to-speech to produce audio back — this new model will unify these tasks, creating a much richer conversational experience,’ said SVP of Alexa Rohit Prasad.

Amazon said Alexa will be able to exhibit attributes like laughter, surprise, and even uh-huhs that encourage users to continue the conversation.

This is all powered by Amazon’s Large Text-to-Speech (LTTS) and Speech-to-Speech (S2S) technologies. The former enables Alexa to adapt its response using textual input such as a user’s request or the topic that is being discussed, while the latter layers on audio input in addition to text to allow Alexa to adapt its response with more conversational richness, Amazon says.

Correction, 9/20/23 12:28 pm et: the new engine is dubbed ‘speech-to-speech,’ not ‘text-to-speech.’ The article was updated to reflect this. 


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