PHILADELPHIA--(BUSINESS WIRE)--Comcast today announced that it will launch a 4K ultra high-definition (UHD) set-top box later this year as it brings the Xfinity in UHD catalog to the X1 platform. The new X1 set-top box, the Xi4, will deliver Xfinity TV customers 4K UHD content—four times the resolution of high-definition—directly to the television, enabling X1 customers to enjoy unlimited virtual 4K linear channels by creating personalized playlists from the Xfinity in UHD library. Customers wi
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