Patent
Sound generator for a system for influencing exhaust noise of a motor vehicle
TLDR
In this article, a sound generator for a system for influencing sound waves propagating through an exhaust system of a vehicle driven by an internal combustion engine, including an enclosure comprised of an upper shell and a lower shell, is configured for a fluid communication with the exhaust system.Abstract:
A sound generator, for a system for influencing sound waves propagating through an exhaust system of a vehicle driven by an internal combustion engine, includes an enclosure comprised of an upper shell and a lower shell. A bell mouth, supported by the lower shell and penetrating the lower shell, is configured for a fluid communication with the exhaust system. A loudspeaker is disposed in the enclosure and supported by the bell mouth. The lower shell of the enclosure supports the upper shell of the enclosure. The bell mouth is solely supported by the lower shell of the enclosure. The lower shell may include at least one air-tight feed-through for a control wire connected to the loudspeaker and/or at least one pressure equalizing valve. An anti-sound system is provided that includes the sound generator and a vehicle is provided with the anti-sound system.read more
Citations
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Patent
Active noise cancellation
TL;DR: In this article, an active noise cancellation system and method was proposed, in which the active noise controller generates an anti-noise signal based on an error signal, and a loudspeaker operatively coupled to the active noises controller converts the anti noise signal into anti noise sound, and the error sensor is disposed at the front face of the loudspeaker.
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TL;DR: In this article, a sound control system of a vehicle includes a sound controller module configured to determine N magnitudes for outputting a predetermined engine sound at N frequencies, where N is an integer greater than one.
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TL;DR: In this article, a sound transmission device with at least one membrane is configured to vibrate so as to mechanically transmit sound waves incident upon it, the sound transmission path being distinct from the exhaust flow path.
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TL;DR: In this article, a sound generating device for a vehicle exhaust system has a housing, a sound generator located in the housing, and a housing wall that comprises an opening for the sound generator and a sound channel that extends in the house.
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Sound generating assembly unit
TL;DR: In this article, a sound generation assembly unit for an exhaust device of an internal combustion engine is described, which includes a sound generator module with a sound module housing to be arranged at an exhaust gas guide element.
References
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PatentDOI
Internal ported band pass enclosure for sound cancellation
TL;DR: A transducer arrangement for active noise cancellation in conduits, for example, in motor vehicles where an electronic control produces a drive signal for a transducers that emits cancellation pulses phased 180° from the sound pressure pulses passing through an exhaust conduit, where both front and rear sides of the transducers are acoustically coupled to improve the efficiency of transducers operation as mentioned in this paper.
Patent
Electronic muffler assembly with exhaust bypass
TL;DR: In this paper, an active noise cancellation system is used to quiet engine exhaust noise, where a microphone senses noise in the vicinity of the tailpipe and provides a signal to a control unit.
Patent
Active noise control system for exhaust systems and method for controlling the same
Christof Lücking,Andre Mengel +1 more
TL;DR: An active noise control system for exhaust systems of a combustion engine operated vehicle comprises an anti-sound control connectable to an engine control of the vehicle and a loudspeaker connected to the control for receiving control signals as discussed by the authors.
Patent
Active muffler for exhaust system of internal-combustion engine, particularly motor vehicle, has housing, sound guidance channel, which is inserted into housing and connection support
Jan Krüger,Manfred Nicolai +1 more
TL;DR: In this article, the active muffler has a housing, a sound guidance channel, and a connection support guided from the housing, over that a muffler is connectable to an exhaust system.
Patent
Active sound absorbers
TL;DR: In this article, an active sound absorber for an exhaust system of an internal combustion engine of a motor vehicle was proposed. But the active membrane was not used for vibration stimulation.