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MOUNTAIN VIEW, Calif. (AP) — Google is prepping for a summer rollout of Duplex, a new voice-powered digital concierge that can call businesses with simple requests. That has meant addressing criticism that it sometimes sounds too human.

Google explains that adding spoken fillers like “um” and “ah” improved Duplex’s ability to book appointments because it was able to interact more naturally with humans.

Duplex will also identify itself as an automated assistant upfront and will disclose that it’s recording calls when speaking with people who answer the phone. Google provided these and other details in a demonstration for reporters Tuesday ahead of the system’s gradual roll out this summer.

The company is taking great pains to assure its new feature conforms to its new principles for artificial intelligence, which it released earlier this month.

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