Redux tech can turn a device display into a speaker, which would eliminate the need for speakers in small devices like smartphones and open up that space for other features.
According to regulatory filings, the transaction, as a part of which Google's United Kingdom subsidiary bought all the shares of Redux holding company NVF Tech Ltd., was completed in December past year.
"Redux has developed breakthrough technology which transforms the user experience by bringing surfaces to life with Sound and Touch", it said in an "about us" section of the company.
At the time, it said the sound quality was 'decent'.
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Last year, it received £3.7 million ($5 million) from an array of investors, including Arie Capital.
It also has technologies that add haptic feedback on mobile displays, which provides vibrations to imitate what it feels like to push physical buttons.
Some of Redux's tech has already appeared in PCs and vehicle infotainment systems. I am not sure but the display-speaker integration may also help Google improve the haptic feedback on their phones.
The startup held 178 patents, according to the company's LinkedIn page, almost all relating to using the surfaces of smartphones, tablets, and other devices into audio amplifiers.
United Kingdom tech startup Redux has been acquired by technology giant Google. If Google doesn't put Redux's technology in a smartphone, it's certainly possible that the company could put it on one of its very own Smart Displays.
At the CES consumer electronics conference in Las Vegas this week, Google is heavily promoting its voice-controlled speakers that compete with Amazon's Echo device.