Traditional coverage of the sport switches between cameras above and underwater. It's not possible to use a single camera to capture all the action because of the different way light refracts in air and water.

With Twinscam two cameras, one underwater and one above the water, have their zoom and focus synchronized to produce a single, realistic image. The result is an image that perfectly matches the above and underwater shots for a complete view of the performance.

NHK used the system at last year's Japan Open synchronized swimming championship and hopes it will be used at next year's London Olympics.

It also showed a Mitsubishi iMiev electric vehicle equipped for live broadcasting. The car has all the equipment needed to support and switch up to four video sources, and send back a live signal. The car's main battery provides a 100-kilometer range and a second battery can power the equipment for up to 2 hours.

Calling it cramped might be an understatement, but the car will allow NHK to broadcast from residential areas where trucks can't go because of noise or narrow streets.