Matsushita Electric Industrial Co. said Friday it has agreed with Comcast Corp., the largest U.S. cable television operator, to supply core software to be used for cable television Internet services in the United States.

The software, which allows users to receive the Internet and interactive services through cable TVs, will be installed in digital cable set-top boxes to be built for Comcast, Matsushita Electric said.

In the United States, where cable TV services have become increasingly digitized, users can add the functions of digital TVs to their cable TVs by installing the software in receivers, Matsushita said.