Patents Assigned to Bruel & Kjaer Sound & Vibration Measurement A/S
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Patent number: 10288474Abstract: The present invention relates to a method and an acoustic measurement system for determining individual noise sound contributions of a plurality of physical noise sources of a motorized vehicle at a target or reference location. The method comprises steps of placing a plurality of reference microphones at respective reference positions adjacent to respective ones of the physical noise sources, placing a measurement microphone at the target location, recording a plurality of noise sound signals and recording a target noise signal. The plurality of noise sound signals are adaptively separated using blind source separation to produce a plurality of mutually independent noise sound signals representing respective estimated noise sound signals of the plurality of physical noise sources.Type: GrantFiled: May 13, 2014Date of Patent: May 14, 2019Assignee: Brüel & Kjær Sound & Vibration Measurement A/ SInventor: Andreas Percy Schuhmacher
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Patent number: 10078006Abstract: A method of determining a property of a sound field from a plurality of measured sound field parameters, the method comprising: receiving a plurality of measured sound field parameters each indicative of a sound field parameter measured by a sensor of an array of sensors, the sensor being positioned at a measurement position; providing a model of a sound field, the model comprising a set of elementary waves and having associated with it a set of model parameters; computing, from the model, computed values of the sound field parameter at each of the measurement positions and as a function of said model parameters; determining a set of parameter values of the model parameters so as to reduce an error measure by performing an iterative minimization process including a plurality of iterations, the error measure comprising an error term operable to compare the computed and the measured sound field parameters; computing the property of the sound field from the determined set of model parameters.Type: GrantFiled: June 26, 2014Date of Patent: September 18, 2018Assignee: Brüel & Kjær Sound & Vibration Measurement A/SInventor: Jørgen Hald
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Patent number: 9560462Abstract: The present invention relates to a microphone test stand comprising a slide assembly with a microphone holder surrounded by a first acoustic sealing member. The slide assembly is movable in a first direction between a first position outside an acoustical chamber with an exposed state of the microphone holder and a second position inside the acoustical chamber in a shielded state of the microphone holder. An electrical connector comprises a set of electrical connector terminals which is connectable to a set of microphone terminals for receipt of a microphone response signal from a microphone assembly arranged in the microphone holder in response to a test sound pressure in the acoustical chamber.Type: GrantFiled: December 19, 2012Date of Patent: January 31, 2017Assignee: Brüel & Kjær Sound & Vibration Measurement A/SInventors: Anders Eriksen, Erik Leon Ziegler
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Patent number: 9456266Abstract: The present invention relates to an ear simulator representing an average acoustic ear drum impedance of ears of a population of humans. Another aspect of the invention relates to an ear simulator assembly comprising an ear simulator representing average acoustic ear drum impedance and a detachable ear canal simulator to provide an ear simulator assembly representing an acoustic impedance of a human ear canal or average human canals of the population.Type: GrantFiled: April 15, 2013Date of Patent: September 27, 2016Assignee: Brül & Kjær Sound & Vibration Measurement A/SInventors: Brian Johansen, Søren Jønsson
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Patent number: 9299336Abstract: A method of determining a focused output signal of a sensor array comprising a plurality of sensors, each sensor being operable to output a sensor output signal responsive to a measured quantity, the focused output signal being indicative of a calculated quantity at a focus point; the method comprising: receiving a respective measured sensor output signal from each of the sensors; computing the focused output signal by performing a focusing calculation with respect to the measured sensor signals; wherein the method further comprises determining a subset of mesh points of a set of predetermined mesh points, each mesh point having at least one pre-computed filter parameter associated with it; and wherein computing the focused output signal comprises performing an interpolation with respect to the subset of mesh points so as to obtain an interpolated focused output signal.Type: GrantFiled: November 2, 2012Date of Patent: March 29, 2016Assignee: Brüel & Kjær Sound & Vibration Measurement A/SInventor: Jørgen Hald
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Patent number: 9200944Abstract: For determining a subjective property such as loudness of a binaural sound signal left and right sound pressures in the left and right ears of a human being, resulting from the binaural sound signal, are determined. The left and right sound pressures are frequency analyzed to obtain left and right frequency spectra. In each frequency band, the diotic (common) sound pressure in the left and right ears is determined, which would result from a plane wave frontal incidence on the human being, and that would produce the same perceived loudness as the frequency bandwidth limited left and right sound pressures. In each frequency band the inverse frontal head related transfer functions are used to determine the free-field sound pressure that would produce the same perceived loudness as the diotic sound pressure. The loudness is determined as the loudness of the totality of frequency bandwidth limited free field sound pressures, preferably using the international standard ISO 532.Type: GrantFiled: April 27, 2005Date of Patent: December 1, 2015Assignee: Brüel & Kjær Sound & Vibration Measurement A/SInventors: Ville Pekka Sivonen, Wolfgang Ellermeier, Soren Bech, Finn Kryger Nielsen
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Patent number: 9201089Abstract: A fiber optical accelerometer comprising a base structure, a first seismic mass movably coupled to the base structure through a first hinge element, a second seismic mass movably coupled to the base structure through a second hinge element, an optical fiber coupled to the first and second seismic masses at first and second attachment joints, respectively, to subject the optical fiber to varying strain by displacement of the first and second seismic masses about the first and second hinge structures, respectively.Type: GrantFiled: May 10, 2011Date of Patent: December 1, 2015Assignee: Brüel & Kjær Sound & Vibration Measurement A/SInventors: Søren Andresen, Torben Rask Licht
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Publication number: 20140313859Abstract: A method of determining a focused output signal of a sensor array comprising a plurality of sensors, each sensor being operable to output a sensor output signal responsive to a measured quantity, the focused output signal being indicative of a calculated quantity at a focus point; the method comprising: receiving a respective measured sensor output signal from each of the sensors; computing the focused output signal by performing a focusing calculation with respect to the measured sensor signals; wherein the method further comprises determining a subset of mesh points of a set of predetermined mesh points, each mesh point having at least one pre-computed filter parameter associated with it; and wherein computing the focused output signal comprises performing an interpolation with respect to the subset of mesh points so as to obtain an interpolated focused output signal.Type: ApplicationFiled: November 2, 2012Publication date: October 23, 2014Applicant: BRÜEL & KJÆR SOUND & VIBRATION MEASUREMENT A/SInventor: Jørgen Hald
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Patent number: 8848481Abstract: Disclosed is a method of reconstructing a sound field. The method comprises receiving measured values of a first acoustic quantity measured at a set of measurement locations; computing a second acoustic quantity for a target location from a superposition of plane waves. The method comprises storing a set of representations of interpolations of respective functions, each function being a function of two or less input parameters; and computing comprises computing each of a set of correlation functions, each correlation function being indicative of a correlation of the plane waves at a first one of said measurement locations with the plane waves at a second location, as a linear combination of values obtained from the set of representations of interpolations.Type: GrantFiled: June 26, 2009Date of Patent: September 30, 2014Assignee: Bruel & Kjaer Sound & Vibration Measurement A/SInventor: Jørgen Hald
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Patent number: 8843223Abstract: The present invention relates to calibration of a computerized test system (20) for testing digital audio devices (30) through a data communication interface. The computerized test system comprises a sound card and a digital calibration generator (31) for calibrating at least a signal receipt channel (25) of the computerized test system (20).Type: GrantFiled: September 22, 2009Date of Patent: September 23, 2014Assignee: Bruel & Kjaer Sound & Vibration Measurement A/SInventor: Lars Birger Nielsen
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Patent number: 8731851Abstract: Disclosed herein is a method of reconstructing a sound field. The method comprises receiving measured values indicative of a first acoustic quantity measured at a set of measurement locations; defining a set of virtual source locations; and computing a second acoustic quantity for at least one target location from one or more wave functions each representative of a respective sound field originating from a respective one of the defined set of virtual source locations; wherein the one or more wave functions are weighted by respective one or more weighting factors, and wherein computing comprises determining the one or more weighting factors from a least-norm fit of the one or more wave functions to the received measured values.Type: GrantFiled: June 26, 2009Date of Patent: May 20, 2014Assignee: Bruel & Kjaer Sound & Vibration Measurement A/SInventors: Jørgen Hald, Jesper Gomes
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Publication number: 20130104655Abstract: A fibre optical accelerometer comprising a base structure, a first seismic mass movably coupled to the base structure through a first hinge element, a second seismic mass movably coupled to the base structure through a second hinge element, an optical fibre coupled to the first and second seismic masses at first and second attachment joints, respectively, to subject the optical fibre to varying strain by displacement of the first and second seismic masses about the first and second hinge structures, respectively.Type: ApplicationFiled: May 10, 2011Publication date: May 2, 2013Applicant: Bruel & Kjaer Sound & Vibration Measurement A/SInventors: Søren Andresen, Torben Rask Licht
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Patent number: 8345428Abstract: The present invention relates to units or modules for data acquisition that may either be used as stand alone units or be used to form a modular system where a plurality of modules are mounted together in a frame or rack structure as well as combinations of such stand-alone units and frames.Type: GrantFiled: May 13, 2008Date of Patent: January 1, 2013Assignee: Brüel & Kjær Sound & Vibration Measurement A/SInventors: Carl Nielsen, Lars Kroman, Aage Vastrup, Halge Larsen, Carsten Hansen, Lars Thestrup
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Publication number: 20110172936Abstract: Disclosed herein is a method of reconstructing a sound field. The method comprises receiving measured values indicative of a first acoustic quantity measured at a set of measurement locations; defining a set of virtual source locations; and computing a second acoustic quantity for at least one target location from one or more wave functions each representative of a respective sound field originating from a respective one of the defined set of virtual source locations; wherein the one or more wave functions are weighted by respective one or more weighting factors, and wherein computing comprises determining the one or more weighting factors from a least-norm fit of the one or more wave functions to the received measured values.Type: ApplicationFiled: June 26, 2009Publication date: July 14, 2011Applicant: BRÜEL & KJÆR SOUND & VIBRATION MEASUREMENT A/SInventors: Jørgen Hald, Jesper Gomes
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Publication number: 20110164466Abstract: Disclosed is a method of reconstructing a sound field. The method comprises receiving measured values of a first acoustic quantity measured at a set of measurement locations; computing a second acoustic quantity for a target location from a superposition of plane waves. The method comprises storing a set of representations of interpolations of respective functions, each function being a function of two or less input parameters; and computing comprises computing each of a set of correlation functions, each correlation function being indicative of a correlation of the plane waves at a first one of said measurement locations with the plane waves at a second location, as a linear combination of values obtained from the set of representations of interpolations.Type: ApplicationFiled: June 26, 2009Publication date: July 7, 2011Applicant: Bruel & Kjaer Sound & Vibration Measurement A/SInventor: Jorgen Hald
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Patent number: 7936175Abstract: The present invention provides a method and an apparatus for in situ test of transducers comprising sensing elements and associated conditioning preamplifiers. The invention makes it possible to evaluate the characteristics of the complete transducer by means of higher integration of the transducer circuitry. Tests can be performed from a remote central location without additional wiring and while the transducer is in operating environment. Testing is performed by superposing test signals and test sequence control signals on the wiring for the transducer output signal, hereby offering flexibility without sacrificing simplicity. Test signalling is by additional circuitry in the transducer interpreted and routed to the input of the conditioning preamplifier based on signalling from the remote test generator, and the signals engendered from the test signals can be analyzed from a remote analyzing system for complete qualifications of the transducer under test.Type: GrantFiled: May 13, 2008Date of Patent: May 3, 2011Assignee: Brüel & Kjaer Sound & Vibration Measurement A/SInventors: Morten Kirkelund, Lars Munch Kofoed
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Publication number: 20100305886Abstract: A vibration control system provides a user-specified value of kurtosis as well as user control over a baseline random spectral density profile. The baseline random spectral density profile and a signal that embeds the desired value of kurtosis are summed in the frequency domain prior to forming a time-domain output waveform that drives a vibration table with attached unit under test. Feedback from a sense transducer attached to the vibration table or the unit under test measures the as-realized vibration's random spectral density and kurtosis value, which are then compared to the desired values to allow correction.Type: ApplicationFiled: May 28, 2010Publication date: December 2, 2010Applicant: BRUEL & KJAER, SOUND & VIBRATION MEASUREMENT A/SInventor: James Zhuge
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Method of determining the sound pressure resulting from a surface element of a sound emitting device
Patent number: 7316162Abstract: A three-dimensional array (10) of microphones (M) is used to determine the three-dimensional sound field above a surface element (?S) of a sound emitting surface (S), and the air-particle velocity (un) at the surface element (?S) is determined using Near-Field Acoustical Holography (NAH). A volume velocity sound source (11) is used to emit a volume velocity (Qv) in a listening position, and the array (10) of microphones (M) is used to determine the resulting three-dimensional sound field above the surface element (?S), and using NAH the resulting sound pressure at the surface element (?S) is determined. The acoustic transfer function (H) between the surface element (?S) and the listening position is assumed to be reciprocal and is determined as the ratio of the resulting sound pressure at the surface element (?S) to the volume velocity (Qv). The sound pressure in the listening position resulting from the surface element (?S) is determined as ?p=H.(un. ?S).Type: GrantFiled: November 10, 2004Date of Patent: January 8, 2008Assignee: Bruel & Kjaer Sound & Vibration Measurement A/SInventor: Jorgen Hald -
Patent number: D615044Type: GrantFiled: November 13, 2008Date of Patent: May 4, 2010Assignee: Brüel & Kjaer Sound & Vibration Measurement A/SInventors: Carl Nielsen, Lars Kroman, Aage Vastrup, Helge Larsen, Carsten Hansen, Lars Thestrup
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Patent number: D1000984Type: GrantFiled: February 20, 2020Date of Patent: October 10, 2023Assignee: BRÜEL & KJÆR SOUND & VIBRATION MEASUREMENT A/SInventor: Steve McGugan