> Right, in ideal hardware. The problem is that in order to transmit an ideal square wave, you need infinite bandwidth. On the contrary. An ideal square wave's

> Right, in ideal hardware. The problem is that in order to transmit an ideal square wave, you need infinite bandwidth. On the contrary. An ideal square wave's higher harmonics decline rather quickly: http://en.wikipedia.org/wiki/Square_wave#Examining_the_square_wave http://en.wikipedia.org/wiki/Square_wave#Examining_the_squar... In other words, there's enough energy to cause problems at 2, 6, 10 ... times f, but at rapidly declining levels. > It will filter the components of the wave that are outside of its bandwidth, leading to 'ringing' artifacts ... Ringing artifacts are present in a system whose bandwidth rolls off abruptly. It's less significant in a system with a gradual drop-off in response, like a piece of wire acting as a broadband antenna.