A system includes an Active Noise Control (ANC) module unit configured to be installed within an air intake or exhaust of a power generation unit. The ANC module unit includes an ANC housing shaped to fit within the air intake or exhaust, an ANC core configured to be secured within the ANC housing, which includes a microphone configured to detect a sound generated by the power generation unit, a control board configured to control the noise-canceling sound based on the sound signal from the microphone and a set of pre-determined noise reduction transfer functions, and a first speaker configured to deliver a first noise-canceling sound to the air intake or exhaust.

A sound generating system for an exhaust system of an internal combustion engine of a motor vehicle includes an electrically actuatable sound generating device to generate sound outside a vehicle interior space. A sound sensor is configured to detect the sound generated by the sound generating device in combination with sound carried by an exhaust gas stream outside the exhaust system. The sound sensor is arranged in a region of a license plate or a rearview camera of the motor vehicle. Furthermore, a motor vehicle includes such a sound generating system. In addition, there is presented a sound sensor unit for such a sound generating system.

An exhaust gas system for an internal combustion engine of a motor vehicle includes at least one exhaust gas line and an active sound-generation device, which comprises a sound line with a mouth that opens into the exhaust gas line and is connected to an electrical sound source. A housing surrounds at least one portion of the exhaust gas line arranged downstream of the mouth of the sound line into the exhaust gas line when viewed in a flow direction of the exhaust gas. The said housing is connected to an error sensor and a cavity is formed between an outer side of the exhaust gas line and an inner side of the housing. The at least one portion of the exhaust gas line extending in the housing has at least one opening that opens into the cavity.

An active sound effect generation system includes: an intake pipe microphone for detecting a vibration noise signal produced in an intake pipe of an internal combustion engine; a driver seat speaker for outputting a sound including a sound effect, and an active sound effect generation device. The active sound effect generation device includes: a reference signal generator for extracting an acoustic component belonging to a predetermined frequency band based on a rotational frequency of the engine from the vibration noise signal, and generating a harmonic reference signal based on the extracted acoustic component; and an adder for generating a control signal to be used to generate the sound effect on the basis of the reference signal, and outputting the control signal to the driver seat speaker. The reference signal generator sets a center frequency for the acoustic component based on the rotational frequency of the engine.

A noise reduction device includes a second corrector that generates a correction signal by correcting an output signal or a standard signal by a predetermined parameter and adds the generated correction signal to an error signal, to generate a corrected error signal approximating the error signal to an error signal indicating a residual sound occurring in a sound reception location.

A vehicle comprising: an internal combustion engine having a cylinder and an exhaust manifold for collecting exhaust gases expelled from the cylinder; an exhaust system configured to channel exhaust gases along a flow path from the exhaust manifold to an exhaust outlet, the exhaust system comprising an exhaust component configured to cause an alteration to engine-generated sound pulses passing through the exhaust component; and a sound bypass device comprising a sound inlet port at a first location on the exhaust system before a first exhaust component along the flow path and a sound outlet port at a second location on the exhaust system after the first exhaust component along the flow path, the sound bypass device being configured to transmit engine-generated sound pulses from the sound inlet port to the sound outlet port whilst preventing flow of exhaust gases from the sound inlet port to the sound outlet port.

A vehicle exhaust system includes a first exhaust gas path and a second exhaust gas path. At least one valve is positioned within the first exhaust gas path and an active noise control system is associated with the second exhaust gas path. An example method includes, providing the first exhaust gas path with a first tailpipe having a first outlet and the second exhaust gas path with a second tailpipe having a second outlet separate from the first outlet. The valve and the active noise control system are controlled simultaneously to control noise generated by the vehicle exhaust system.

A method for performing an active profiling of the sound emitted by a vehicle engine including the steps of injecting second acoustic waves (MW), which are able to combine with the first acoustic waves (EW) in a merge point in said primary propagation path and to generate third resulting acoustic waves (RW); and generating a driving signal for the diffuser by regulating the amplitude of harmonics of the driving signal (SP) as a function of reference acoustic waves and of a workpoint of the engine, calculating equalization coefficients (.sub.1, . . . , .sub.M) to be applied to the amplitudes of said harmonics of the driving signal (SP) via a self-tuning procedure, and comparing the reference acoustic waves (TW) with a simulation (SRW) of the resulting waves. The simulation (SRW) is obtained by applying to a simulation of the second acoustic waves a model of the secondary propagation path.

The present disclosure relates to a vehicle exhaust assembly (1) for an internal combustion engine. The vehicle exhaust assembly (1) comprises an exhaust system (3) and an exhaust mounting assembly (4) for mounting the exhaust system (3) to a vehicle (2). The exhaust system (3) comprises an inlet section (5) for connection to the internal combustion engine; an intermediate section (6) connected to the inlet section (5); an outlet section (7) for exhausting gases from the internal combustion engine; and one or more exhaust decoupler (8) for decoupling the intermediate section (6) from the inlet section (5). The exhaust mounting assembly (4) comprises one or more first isolator device (20-1, 20-2) for resiliently constraining movement of the intermediate section (6) of the exhaust system (3) in a longitudinal direction; and one or more second isolator device (20-3, 20-4) for resiliently constraining movement of the outlet section (7) of the vehicle (2) exhaust in a transverse direction. The present disclosure also relates to a vehicle (2) including a vehicle exhaust assembly (1).

Combustion gas of an internal combustion engine passes through an exhaust system to an outlet opening. A detection device generates a state signal that describes an engine noise of the internal combustion engine. A control apparatus actuates at least one loudspeaker to produce a sound at the outlet opening based on the state signal to compensate for the engine noise or produce another engine noise, independently of the state signal based on predetermined audio data and thereby to use the at least one loudspeaker to audibly output an advisory signal described by the audio data.