Arrangement for recording an audio signal

摘要: The invention relates to an arrangement for obtaining record carriers carrying audio signal which is protected against further copying. For this purpose low-frequency components of the left-hand and right-hand channel are derived by means filter devices (3, 4). A first auxiliary a second added be recorded in such way that during reproduction recorded, including thereto, two loudspeaker units arranged stereo configuration signals not audible (see Fig. 1). it possible normally provided with copy-protection code form said but inhibit or recording code.