An update coming out today will enable Home's built-in assistant to learn the different voices of up to six people, although they can't all be talking to the internet-connected speaker at the same time.
Distinguishing voices will allow Home to be more personal in some of its responses, depending on who triggers the assistant with the phrase, "OK Google" or "Hey Google."
For instance, once Home is trained to recognise a user named Joe, the assistant will automatically be able to tell him what traffic is like on his commute, list events on his daily calendar or even play his favorite songs. Then another user named Jane could get similar information from Home, but customised for her.
The Echo doesn't yet recognise different voices, so Alexa can't retrieve more personal information for different accounts.
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Google's voice-distinction feature, however, won't prevent unauthorised users from activating the assistant, as long as Home's microphone is turned on.
That loophole allowed Burger King to recently air a TV commercial that included the phrase "OK Google" to prompt Home's assistant to recite the ingredients of the fast-food restaurant's Whopper burger from a Wikipedia entry.
Google quickly blocked Burger King's commercial from toying with the Home assistant, but the marketing stunt illustrated how the technology can be manipulated. Voice- personalisation eventually could enable Home's users to block others from accessing the device, but Google isn't ready to do that yet.
The voice-distinction feature also isn't being offered for the same digital assistant that operates on Google's Pixel phone and other smartphones running on the latest version of its Android software. Google doesn't think the technology is necessary on phones because most of those devices are password-protected and are usually used by just one person.