Abstract: A control installation of the playing time of a sporting event, in particular of the basketball game type, including a portable acquisition and detection system of a whistle signaling the stoppage of the playing time, said portable system converting the acoustic signals into digital signals, digitally processing these digital signals and delivering a digital refereeing signal in response to the detection of the whistle; and a fixed system for controlling the playing time in digital radio connection with the portable system and comprising controller for controlling the stoppage and/or restarting of a stopwatch counting down the playing time in response to the reception of the digital refereeing signal, the invention also concerning the portable system alone and the fixed system alone specially adapted for the portable system, as well as an audio-digital communication terminal by temporal multiplexing integrating such a portable system.