[geoff]

On 15/10/2015 11:40 a.m., wrote:
Scott Dorsey:

An analogy with a city skyline: The individual buildings are
the waveform, while an imaginary line from the top of each
building to the next would be the envelope. But remember:
the 'envelope' is just an outline.


Yeah, the visual analogy is far easier to understand than "low-pass
filtering", especially for the non-technical. But still, it has been
explained already so many times ....

geoff