The story
MIPRO was established in 1995 by founder K.C. Chang, who had in 1970 designed the first FM wireless microphone in Taiwan and obtained the first patent for a condenser microphone capsule in Taiwan.
In 2001 MIPRO introduced a technology they termed ACT (Automatic Channel Targeting). "ACT" synchronizes the receiver and transmitter frequencies. This was followed in 2006 by MIPRO introducing the first encrypted digital wireless microphone system and later, digital wireless tour guide & language interpretation Systems in Taiwan.
From Wikipedia’s article on MIPRO, shared under CC BY-SA 4.0.4