Hedy Lamarr and George Antheil had an idea that was radically different – communication through multiple frequency channels. The concept of just how to implement what’s now known as Frequency Hopping was scribbled in pencil on an envelope in Antheil’s home. The genesis of that idea – the seminal concept behind spread spectrum – is immortalized on this envelope, published here for the first time for the world to see.
Front image describing the torpedo
guidance system
Back image showing piano roll style synchronization