Control in door call installation

摘要

The signal transmitter (3) communicates with the control (2), whose functions are controllable by the transmitter signals, with the transmitter containing a call signal generator (6), e.g. a door bell by which the control is actuatable. Typically the transmitter is a speaker (7), generating and transmitting a speech signal for actuating the control which may contain a memory (9) for recording information to be called out, with the transmitter signals used for triggering the reproduction of the recorded message.