Abstract: A noise reduction system for actively blocking a noise source for a means of transport. The noise reduction system comprises at least one counter sound source and at least one intensity sensor. The at least one counter sound source and the at least one intensity sensor are arranged in a measuring region. In the measuring region, measuring of the noise intensity of the noise source and measuring of the counter sound intensity of the counter sound source are by the intensity sensor. Based on the measured noise intensity and the counter sound intensity, the counter sound source is controllable such that the sound energy input of the noise source can be globally reduced by the counter sound source.

Abstract: The present application relates to a sound reduction device as well as to a corresponding method. The sound reduction device comprises a sound pickup for measuring an occurring error signal of a primary sound wave of the noise source and of a secondary sound wave of a narrow-band electroacoustic transducer. This error signal may be transmitted to a control unit, which receives a reference signal of the noise source and generates a control signal which is adapted to change the mechanical values of the electroacoustic transducer.

Abstract: The invention relates to a method and device for active sound damping in a closed interior space (1) having an external wall which comprises at least one wall section (3, 4) with a primary sound source (6) which emits a primary sound signal induced by an interference signal (5), with at least one secondary sound generator (7; 12) in the interior space for generating a secondary sound signal, at least one sound pick-up device (10) in the interior space for detecting a sound signal in the interior space and a control device (8) which is connected to the at least one secondary sound generator (7; 12) and to the at least one sound pick-up device (10) and which controls the at least one secondary sound generator in dependence on the output signal of the at least one sound pick-up device so that the secondary sound signal is positioned substantially complementary to the primary sound signal.

Abstract: A noise reduction system for actively blocking a noise source for a means of transport. The noise reduction system comprises at least one counter sound source and at least one intensity sensor. The at least one counter sound source and the at least one intensity sensor are arranged in a measuring region. In the measuring region, measuring of the noise intensity of the noise source and measuring of the counter sound intensity of the counter sound source are by the intensity sensor. Based on the measured noise intensity and the counter sound intensity, the counter sound source is controllable such that the sound energy input of the noise source can be globally reduced by the counter sound source.

Abstract: An active countersound system for actively reducing the sound waves of primary sound waves, with a regulator unit, an error sensor, a reference sensor and several secondary actuators.

Abstract: The present application relates to a sound reduction device as well as to a corresponding method. The sound reduction device comprises a sound pickup for measuring an occurring error signal of a primary sound wave of the noise source and of a secondary sound wave of a narrow-band electroacoustic transducer. This error signal may be transmitted to a control unit, which receives a reference signal of the noise source and generates a control signal which is adapted to change the mechanical values of the electroacoustic transducer.