Enlarge / The first Amazon Echo speaker. (credit: Luke MacGregor/Bloomberg via Getty Images)

A Delaware federal court has ordered Amazon to pay $46.7 million for infringing on four patents belonging to VB Assets with Amazon's Echo smart speakers and Alexa virtual assistant. A lawsuit from Nuance Communications-owned VB Assets, previously known as VoiceBox Technologies, claimed to have already invented a circular speaker that could connect to the web and answer voice-dictated prompts with a female, robotic voice.

Wednesday's judgment [PDF], initially reported by Reuters, orders Amazon to pay the sum via running royalty rather than a lump sum. The ruling follows a jury verdict [PDF] finding that Amazon infringed upon four of VoiceBox's patents. The patents relate to providing network-coordinated conversational services, a conversational voice user interface, and tying advertisements to natural language processing of voice-based input. VB Assets originally accused Amazon of infringing on six of its patents.

Amazon still has time to appeal the judgment, and VoiceBox has time to seek reimbursement for related costs.