Sigma Designs, a leader in digital media processing for consumer appliances, announced that TISNet, a subsidiary of Tatung Company, currently responsible for Tatung Company's worldwide DSTB, NPVR, digital home product sales, and software development and technical support, launched its set-top box (STB), the STB4000C, based on Sigma's Designs EM8620 and EM8622 media processors at last week's Supercomm 2005. The TISNet STB4000C supports up to 720p/1080i of high resolution video output, as well as manages multiple outputs to provide under 720p playback and PIP (Picture-in-Picture), simultaneously displaying video for up to four monitors or televisions.