| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 381710500 | Within duct | 12 |
| 20090010446 | SOUND CONTROL APPARATUS OF IMAGE FORMING APPARATUS - A sound control apparatus of image forming apparatus includes a sound-transmitting channel in which the sound in the image forming apparatus can be transmitted to the outside of the image forming apparatus, a sound-collecting portion which is provided at the sound-transmitting channel and collects sounds, and a speaker which is provided at the outside of the apparatus to the sound-collecting portion in the sound-transmitting channel and outputs sounds corresponding to the sounds collected by the sound-collecting portion, where a channel length between the sound-collecting portion and the speaker in the sound-transmitting channel is longer than a linear distance between the sound-collecting portion and the speaker. | 01-08-2009 |
| 20100002890 | Electronic Device Having Active Noise Control With An External Sensor - An electronic device includes an enclosure for the electronic device and a duct extending from an interior to an exterior of the enclosure to exhaust airflow from the enclosure. The electronic device further includes an active noise control mechanism. The active noise control mechanism includes an internal sensor, an external sensor, and an acoustic wave generator. The internal sensor is arranged within the enclosure to sense a noise and generate an internal sensor output, and the external sensor is arranged outside of the enclosure to detect sounds and generate an external sensor output. Based on the internal sensor output and the external sensor output, the acoustic wave generator generates an acoustic wave within the duct to reduce the noise. | 01-07-2010 |
| 20120275614 | NOISE CANCELLATION UNIT - A noise cancellation unit includes: a duct connected to an outlet of an electronic apparatus and configured to pass an exhaust flow discharged from the outlet therethrough; a first microphone provided to the duct; a speaker provided to the duct downstream of the first microphone; a second microphone provided to the duct downstream of the speaker; a first windscreen wall configured to prevent the exhaust flow from colliding with the first microphone; a second windscreen wall configured to prevent the exhaust flow from colliding with the second microphone; and a signal processing circuit configured to generate, based on outputs of the first microphone and the second microphone, a sound signal for removing a noise included in the exhaust flow and supply the sound signal to the speaker. | 11-01-2012 |
| 20120288111 | TRANSMISSION PATH COMPENSATOR - The invention relates to a system for generating anti-noise in an exhaust-gas line ( | 11-15-2012 |
| 20120308023 | ACTIVE NOISE CONTROL SYSTEM FOR EXHAUST SYSTEMS AND METHOD FOR CONTROLLING THE SAME - 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 and designed for generating an anti-sound in a sound generator, fluidically connectable to the exhaust system. In the control, at least two curves are stored in order to cancel airborne sound conducted in the exhaust system through outputting the signal to the loudspeaker. The curves cover different temperature ranges of the exhaust gas, which temperature ranges overlap one another by pairs or directly adjoin one another. The control is furthermore designed to select a curve suitable for a respective temperature of the exhaust gas conducted in the exhaust system from the available curves by means of signals output by the engine control and output signals to the loudspeaker making use of this curve. | 12-06-2012 |
| 20130108067 | OVERLOAD PROTECTION FOR LOUDSPEAKERS IN EXHAUST SYSTEMS | 05-02-2013 |
| 20130121501 | ACTIVE NOISE CONTROL APPARATUS FOR INTAKE SYSTEM OF VEHICLE - An active noise control apparatus for an intake system of a vehicle may include a filter mounted on a portion of the intake system for blocking foreign materials; and a speaker assembly detachably installed at the portion to which the filter is mounted. | 05-16-2013 |
| 20140023200 | AIR CONDITIONING UNIT - The invention relates to an air conditioning unit having an air duct, having a fan for conveying an airflow through the air duct, having a heat exchanger for the thermal conditioning of the airflow and having an apparatus for noise reduction, which apparatus has a microphone, a loudspeaker and an evaluation and control unit, the microphone being arranged in a housing indentation of the duct wall of the air duct, the housing indentation having a wall and the loudspeaker being arranged at least partially in an opening of the duct wall of the air duct in a manner which is spaced apart from the microphone in the direction of the noise emission, wherein the wall of the housing indentation is curved at least partially, the housing indentation of the microphone being covered with a porous acoustically transparent material. | 01-23-2014 |
| 20140133667 | SYSTEM AND METHOD FOR ATTENUATING NOISE FROM A FLUID MACHINE OR A TURBULENT NOISE SOURCE - A noise cancellation system for transporting a fluid (M) from an inlet in one space (RM | 05-15-2014 |
| 20140341385 | DUAL RESONATOR CHAMBER WITH VARIABLE VOLUME - The dual resonator chamber with variable volume includes first and second housings. The second housing is slidably mounted within the first housing such that a second inner neck portion of the second housing is slidably mounted about the first inner neck portion of the first housing and forms a fluid-tight seal therewith. A sliding wall is slidably mounted within the second housing, dividing the interior thereof into upper and lower resonator chambers. At least one first actutator selectively adjusts the height of the sliding wall with respect to the second lower end of the second housing to selectively adjust volumes of the upper and lower resonator chambers. At least one second actuator selectively adjusts the height of the second housing with respect to the first housing to selectively adjust the neck length of the lower resonator chamber. | 11-20-2014 |
| 20150071452 | ACTIVE SOUND GENERATION DEVICE - An active sound generation device for exhaust gas systems of motor vehicles having a housing and a sound generation means arranged in the housing, in particular a loudspeaker, with a closed sound generation surface and a margin sealingly surrounding the sound generation surface, wherein, for the reduction of the manufacturing costs, the housing has an at least sectionally cylindrical shape and the inner diameter of the cylindrical shape corresponds to the projection of the outer periphery of the margin surrounding the sound generation surface onto a surface perpendicular to the cylinder axis such that the sound generation means can be inserted in a gas-tight manner at any desired point of the cylindrical section. | 03-12-2015 |
| 20150124990 | ACTUATOR ARRANGEMENT ON A VEHICLE STRUCTURE - An arrangement ( | 05-07-2015 |
