Abstract:
Sound and/or vibration in a vehicle (10) is enhanced by using at least one active powertrain mount (24, 26) to selectively generate vibrations in the vehicle body (12), at least some of which are audible to a person in a cabin of the vehicle. The method can be used to enhance the sound and feel of the vehicle powertrain. The active powertrain mounts typically include at least one active engine mount (24) but may also include at least one active transmission mount (26). The active mounts (24, 26) are controlled by an ECU to attenuate unwanted powertrain vibrations in the usual way whilst simultaneously generating vibrations in the vehicle body to augment desirable engine sounds/vibrations.
Abstract:
Esta invención consiste en una solución de eficiencia energética para motores de combustión interna, y particularmente a una solución termo acústica para sistemas de exhausto basada en un sistema de recuperación de calor, un sistema activo de cancelación de ruido y un método para controlar el mismo, desarrollado para ser usado con cualquier motor de combustión interna.
Abstract:
The invention discloses systems and methods for enhancing the sound of vocal utterances of interest in an acoustically cluttered environment. The system generates canceling signals (sound suppression signals) for an ambient audio environment and identifies and characterizes desired vocal signals and hence a vocal stream or multiple streams of interest. Each canceling signal, or collectively, the noise canceling stream, is processed so that signals associated with the desired audio stream or streams are dynamically removed from the canceling stream. This modified noise canceling stream is combined (electronically or acoustically) with the ambient to effectuate a destructive interference of all ambient sound except for the removed audio streams, thus "enhancing" the vocal streams with respect to the unwanted ambient sound. Cepstral analysis may be used to identify a fundamental frequency associated with a voiced human utterance. Filtering derived from that analysis removes the voiced utterance from the canceling signal.
Abstract:
The present invention is an active internal combustion engine exhaust noise reduction system optionally capable of harvesting acoustic energy from the exhaust stream. Salient features include at least one controllably movable reaction element, preferably designed to minimize exhaust back pressure while converting pressure and velocity variations to electrical energy.
Abstract:
Invention relates to an exhaust gas noise attenuator unit (10), the attenuator unit comprising exhaust gas inlet and an exhaust gas outlet (16) arranged in flow connection with each other via a duct section (18) between them; at least two attenuation chambers (20.1, 20.2, 20.3, 20.4) arranged in flow connection with the duct section (18); at least two attenuation chambers are reactive attenuation chambers with open gas space; and the spaces thereof are at least partially bordered by a common wall section (36, 36'), and a first one (20.1) of the at least two attenuation chambers is arranged in flow connection with the duct section (18) at a first location (12.1) in longitudinal direction; and a second one (20.2) of the at least two attenuation chambers is arranged in flow connection with the duct section (18) at a second location (12.2) in longitudinal direction.
Abstract:
A contained vortices device that allows for the flow of air or gas into and out of the device. In the process of gases moving through the device, a vortex is created within the device that allows for the separation of heavier materials, reduction of the size of any particulates, and the expelling of particulates of a significantly smaller size than was introduced to the device.
Abstract:
Le procédé d'atténuation du bruit basse fréquence produit en sortie (18) d'une ligne d'échappement (14) comporte : définir un signal de bruit à atténuer représentatif du bruit à atténuer ; émettre dans une zone d'atténuation (26) de la ligne d'échappement (14), une première onde acoustique haute fréquence (F1) à partir d'un premier transducteur (22), laquelle première onde acoustique a une fréquence porteuse supérieure à 50 kHz ; et émettre, dans la zone d'atténuation (26) de la ligne d'échappement, une seconde onde acoustique haute fréquence (F1 + Δf cb ) à partir d'un second transducteur (24), laquelle seconde onde acoustique a, pour fréquence porteuse, la fréquence porteuse de la première onde acoustique haute fréquence (F1) et contient un signal de contre-bruit basse fréquence (Δf cb ) en opposition de phase avec le au signal de bruit à atténuer.
Abstract:
The invention concerns a transverse partition (24, 124) separating two adjacent chambers (26) of an exhaust volume (12) comprising at least a passage (44, 164) for gases circulating between the two chambers, the cross-section provided for the gas circulation through the passage (44, 164) being variable under the action of the pressure difference between the two sides of the partition. Said partition comprises a wall (30, 154) notched with at least one slot (40, 160) defined between two adjacent edges of the wall, which wall is elastically deformable under the action of the pressure difference between the two sides of the partition, between a neutral position wherein the continuity of the wall is ensured, the two edges of the slot (40, 162) being substantially assembled and a deformed position wherein the two edges of the slot are spaced apart defining between them said gas circulation passage (44, 164).