Audio information transmission system - has noise suppression stage at loudspeaker end for eliminating switching noise

摘要

The transmission system is used between a radio receiver (1) and one or more spaced loudspeakers (2), coupled to the receiver (1) via a LF signal line (3). A noise suppression circuit is incorporated for elimination of the spurious noise signals resulting from the switching out of the receiver (1). Pref. the noise suppression circuit is controlled from the receiver (1) via the LF signal line (3), or via the voltage supply line (7) providing the operating voltage for the loudspeaker circuit (8), the noise suppression provided by a mute circuit (6) inserted between a pair of end amplifier stages. ADVANTAGE - Simple elimination of switching noise.