Light signal system for deaf persons

This system has at least one acoustic or electrical sensor device and at least one optical output device. Both devices are connected to one another via the power supply system, the sensor device exhibiting an RF transmitter which outputs a modulated data word to the power system when the sensor responds. The output device is equipped with an RF receiver which has a corresponding demodulator which is followed by a comparator for detecting the data word and an optical transducer. In such a light signal system, a high operational reliability is to be achieved by an error-correcting transmission method by means of an increased redundancy in the transmission of the data words. For this purpose, the transmitter transmits the data word at the same phase angle as the power system frequency and, additionally, an inverse data word, and the comparator of the receiver activates the optical transducer if at least one of the data words is received and detected.