Noiseless and invisible transmission of directions and similar instructions

For the purpose of soundless and invisible transmission of instructions to actors, the instructions are entered in an input device which converts these into electrical signals, wherein via a transmitter device the signals are converted into a form suitable for transmission and transmitted. Each actor wears a small and lightweight receiver device which can be worn unobtrusively below the clothing. The receiver device receives and decodes the signals transmitted and passes them on to one or more vibration emitters e.g. vibration motors, which the actor also wears unobtrusively below his clothing. Consequently, instructions and directions are relayed to actors, noiselessly.