In depth: The tech to watch this Olympics – and how we'll be watching in 2020

The road to Tokyo, via RioWith the Olympics rivalled only by the World Cup when it comes to viewing figures, it's hardly surprising that the Games are no stranger to new broadcast tech. Back in 1964, host city Tokyo was the first to broadcast live TV images via satellite to a gobsmacked world, and local company Toshiba even filmed the sumo wrestling and judo events using its new colour transmission system.Right now Brazil is gearing up for the smartest sporting event yet, with the Rio 2016 Olymp