Berthelsen
Andrew James Berthelsen, Marshalltown, IA US
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20120217426 | VALVE APPARATUS HAVING A DOUBLE-OFFSET SHAFT CONNECTION - Valve apparatus having a double-offset shaft connection are described herein. An example flow control member includes a sealing surface to move relative to a seal where the flow control member has a first axis and a second axis substantially perpendicular to the first axis and the first and second axes intersect a center of curvature of the sealing surface. The flow control member also includes an opening to receive a shaft where the opening has a third axis passing through the opening to define a pivot about which the sealing surface rotates. The third axis is offset from the first and second axes. | 08-30-2012 |
Kim Berthelsen, Ulfborg DK
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20100090472 | Wind Turbine Rotor Blade and Method of Manufacturing Such Rotor Blade - The invention relates to a wind turbine rotor blade comprising a blade tip and a lightning protection system. The blade includes at least one metallic lightning receptor at the surface of the blade in proximity of the distal end of the blade tip. The blade comprises a blade shell configured partly by a fibre-reinforced laminate, and the blade also comprises an electrically down-conducting element in the form of a metallic mesh. The electrically down-conducting element extends only to a certain distance from the distal end of the tip of the blade, said distance being larger than a distance between the position of the lightning receptor and the distal end of the tip of the blade. It is hereby ensured that a stroke of lightning will strike the receptor more likely than the electrically down-conducting element. | 04-15-2010 |
Kim Spetzler Berthelsen, Køge DK
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20160105746 | OVERHEAT PROTECTOR AND PROTECTION METHODOLOGY FOR ELECTRODYNAMIC LOUDSPEAKERS - The present invention relates in one aspect to a voice coil temperature protector for electrodynamic loudspeakers. The voice coil temperature protector comprises an audio signal input for receipt of an audio signal supplied by an audio signal source and a probe signal source for generation of a low-frequency probe signal. A signal combiner is configured to combine the audio signal with the low-frequency probe signal to provide a composite loudspeaker drive signal comprising an audio signal component and a probe signal component. The voice coil temperature protector comprises a current detector configured for detecting a level of a probe current component flowing through the voice coil in response to the composite loudspeaker drive signal and a current comparator which is configured to comparing the detected level of the probe current component with a predetermined probe current threshold. The predetermined probe current threshold corresponds to a predetermined voice coil temperature via a known temperature dependency of a voice coil resistance. The voice coil temperature protector further comprises a signal controller configured for attenuating a level of the audio signal in response to the probe current component falls below the predetermined probe current threshold. | 04-14-2016 |
Kim Spetzler Berthelsen, Koge DK
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20140241536 | METHOD AND DETECTOR OF LOUDSPEAKER DIAPHRAGM EXCURSION - The present invention relates in one aspect to a method of detecting diaphragm excursion of an electrodynamic loudspeaker. The method comprises steps of generating an audio signal for application to a voice coil of the electrodynamic loudspeaker and adding a high-frequency probe signal to the audio signal to generate a composite drive signal. The method further comprises a step of applying the composite drive signal to the voice coil through an output amplifier and detecting a modulation level of a probe signal current flowing through the voice coil. | 08-28-2014 |
20150030167 | Method of Detecting Enclosure Leakage of Enclosure Mounted Loudspeakers - A method of detecting enclosure leakage of an electrodynamic loudspeaker mounted in an enclosure or box may include applying an audio signal to a voice coil of the electrodynamic loudspeaker through an output amplifier and detecting a voice coil current flowing into the voice coil. A voltage across the voice coil may be detected and an impedance or admittance of the loudspeaker across a predetermined audio frequency range may be detected based on the detected voice coil current and voice coil voltage. A fundamental resonance frequency of the loudspeaker may be determined based on the detected impedance or admittance and compared with a nominal fundamental resonance frequency of the loudspeaker representing a sealed state of the enclosure. Acoustic leakage of the enclosure may be detected based on a deviation between the determined the fundamental resonance frequency and the nominal fundamental resonance frequency of the electrodynamic loudspeaker. | 01-29-2015 |
20150030169 | Method of Controlling Sound Reproduction of Enclosure Mounted Loudspeakers - A method of controlling sound reproduction may include applying an audio signal to a voice coil of the electrodynamic loudspeaker to produce sound, detecting one of an impedance and admittance of the loudspeaker across a predetermined audio frequency range based on a detected voice coil current and voice coil voltage and determining a fundamental resonance frequency of the loudspeaker based on the detected impedance or admittance. The fundamental resonance frequency of the loudspeaker may be compared with a nominal fundamental resonance frequency of the loudspeaker representing a nominal acoustic operating condition of the loudspeaker. A change of operating condition of the loudspeaker may be detected based on a frequency deviation between the determined fundamental resonance frequency and a nominal fundamental resonance frequency of the loudspeaker. The level of the audio signal may be attenuated in response to the frequency deviation meets a predetermined frequency error criterion. | 01-29-2015 |
20150124982 | METHOD OF ESTIMATING DIAPHRAGM EXCURSION OF A LOUDSPEAKER - A method of estimating diaphragm excursion of an electrodynamic loudspeaker may be performed using audio signals. An audio output signal may be applied to a voice coil of the electrodynamic loudspeaker through an output amplifier to produce sound. A detected voice coil current and a determined voice coil voltage may be applied to a linear adaptive digital loudspeaker model that has a plurality of adaptive loudspeaker parameters. The parameter values of the adaptive loudspeaker parameters may be computed based on the linear adaptive digital loudspeaker model and applied to a non-linear state-space model of the electrodynamic loudspeaker. For the non-linear state-space model, a predetermined non-linear function may be applied to at least one of the plurality of received parameter values to compute at least one non-linearity compensated parameter value of the adaptive loudspeaker parameters, to determine an instantaneous excursion of the diaphragm. | 05-07-2015 |
20150229353 | ECHO CANCELLATION METHODOLOGY AND ASSEMBLY FOR ELECTROACOUSTIC COMMUNICATION APPARATUSES - A feedback cancellation assembly for an electroacoustic communication apparatus may include a signal transmission path for generation and emission of an outgoing sound signal to an external environment through an electrodynamic loudspeaker and a signal reception path comprising a microphone for generation of a microphone input signal corresponding to sound received from the external environment. The signal reception path may generate a digital microphone signal. The outgoing sound signal may be acoustically coupled to the microphone. An electronic feedback cancellation path may be coupled between a tapping node and a summing node to produce a feedback cancellation signal to the summing node. | 08-13-2015 |
20150281836 | TRANSDUCER AMPLIFICATION CIRCUIT - A transducer amplification circuit may include a preamplifier circuit with a signal input receiving a transducer signal to provide an amplified transducer signal comprising audible frequency components and ultrasonic frequency components. The transducer amplification circuit may include a first sigma-delta modulator configured to sample and quantize the amplified transducer signal to generate a first digital transducer signal comprising a first quantization noise signal. The first sigma-delta modulator may include a first noise transfer function having a high pass response in at least a portion of an audible frequency range to push the quantization noise signal to ultrasonic frequencies. A second sigma-delta modulator is configured to sample and quantize the amplified transducer signal to generate a second digital transducer signal comprising a second quantization noise signal. The second sigma-delta modulator may include a second noise transfer function with a magnitude minimum placed at the ultrasonic frequencies. | 10-01-2015 |
Lafs Hoffmann Berthelsen, Kolding DK
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20120063921 | Control Algorithm of Variable Speed Pumping System - A pumping system includes a pump for moving water. In one aspect, this is in connection with performance of an operation. The system includes a variable speed motor operatively connected to drive the pump. A value indicative of flow rate of water is determined and the motor is controlled to adjust the flow rate indicative value toward a constant. A value indicative of flow pressure is determined and the motor is controlled to adjust the flow pressure indicative value toward a constant. A selection is made between flow rate control and flow pressure control. In another aspect, the pump is controlled to perform a first operation, and is operated to perform a second water operation. Control of operation of the pump to perform the first water operation is altered in response to operation of the pump to perform the second operation. | 03-15-2012 |
Lars Berthelsen, Kolding DK
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20120025748 | METHOD FOR STARTING A SINGLE-PHASE INDUCTION MOTOR - The invention relates to a method ( | 02-02-2012 |
Timothy Berthelsen, Tillamook, OR US
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20080277246 | Reciprocating slat conveyer - The present disclosure concerns embodiments of a reciprocating slat conveyor, such as used to form the floor of a mobile cargo container. For example, the slat conveyor can be installed in the collection area of a garbage collection truck. In particular embodiments, the conveyor includes an elongated floor assembly that has a concave upper surface such that the left and right longitudinal sides of the floor assembly curve upwardly from the longitudinal center of the floor assembly. In this manner, materials, especially liquids, tend to funnel downwardly along the curved portions of the floor assembly and accumulate proximate the center of the floor assembly. | 11-13-2008 |
Timothy M. Berthelsen, Tillamook, OR US
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20130186733 | Double-Sealed, Bearingless, Reciprocating Conveyor With Slat-Supporting Guide Trough Subdecks - A reciprocating slat conveyor includes a plurality of laterally and substantially parallel longitudinal trough-like subdecks and a plurality of longitudinal slats adjacent to and parallel to each other. The slats are in a sliding relationship with a pair of adjacent subdecks and cover the longitudinal space between the pair of adjacent subdecks. The subdecks longitudinally support two adjacent slats at or near a slat longitudinal side edge. The subdecks conduct the movement of the slats, preferably without distinct bearing elements therebetween. Some preferred embodiments include raised double-seal system. | 07-25-2013 |
20140090960 | Bearingless Reciprocating Slat-Type Conveyor Assemblies - A tipper retrofit bearingless reciprocating slat-type conveyor assembly | 04-03-2014 |
Trygve Berthelsen, Royneberg NO
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20100006290 | METHODS OF MAKING MULTIPLE CASING CUTS - Methods of removing casing from a wellbore, the method including disposing a drilling tool assembly in a wellbore, the drilling tool assembly including a cutting device, a spearing device, and a jarring device. The methods further including activating the cutting device, cutting a first casing segment, deactivating the cutting device and activating a spearing device. The method further including engaging the spearing device with the first casing segment, activating the jarring device to free the first casing segment, and removing the first casing segment from the wellbore. | 01-14-2010 |