phase cancellation encryption in Max

This patch mixes two audio signals, then makes one disappear by reversing its phase. A similar method was used by U.S. military to encrypt radio transmissions during the 20th century. A ¬†phonograph record was the ‘key’ to unlock the encoded transmission. In practice it was difficult to synchronize the two recordings to achieve phase cancellation.


folder: phase-cancellation


  • phase-cancellation-example.maxpat
  • disappearing-act.maxpat