As part of the system electronics, Microtune’s tuner chips enable the TiVo set-top’s TV entertainment, multimedia and interactive services capabilities, including superb HD pictures and sound.

And:

The two tuners, when integrated into the new TiVo dual-tuner set-top box, deliver the robust, reliable radio frequency (RF) performance required for enabling off-air TV broadcasts, hundreds of different cable channels, video-on-demand programs, recording and playback of TV programs, interactive advertising and the high-quality video available for download through the TiVoCast(TM) service

I realize they couched it with “As part of the system electronics” and “when integrated into the new TiVo dual-tuner set-top box”, but it sounds like they’re implying their chips are involved in more than what they really do – tune cable and broadcast signals. Picked up from Business Wire.