Broadband Decoupling Definition:
In 13C NMR spectroscopy, a technique in which all 13C!1H splitting is suppressed with the use of two rf transmitters.
Broadband Decoupling Explained:
The first transmitter make 13C resonate, while the second transmitter causes all 1H to resonate. In effect, decoupling occurs, in which all the signals are shown as singlets.