Patents by Inventor Lutsen Ludgerus Albertus Hendrikus Dooper
Lutsen Ludgerus Albertus Hendrikus Dooper has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10008994Abstract: An audio amplifier system is described comprising: a variable gain audio processor for processing digital audio signal, a digital to analog converter coupled to the audio processor, and configured to receive the processed digital audio signal, a variable gain amplifier having an input coupled to the output of the digital to analog converter and operably connected to a power supply, a controller coupled to the variable gain audio processor and the variable gain amplifier and configured to switch the audio amplifier system between a first operating mode having a first power supply voltage value and a second operating mode having a second higher power supply voltage value; wherein the controller is operable in the first operating mode to set the audio amplifier system gain to a desired gain value and in the second operating mode to maintain the desired gain value.Type: GrantFiled: April 6, 2017Date of Patent: June 26, 2018Assignee: NXP B.V.Inventors: Marco Berkhout, Lûtsen Ludgerus Albertus Hendrikus Dooper, Maarten van Dommelen, Han Martijn Schuurmans
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Patent number: 9826294Abstract: A loudspeaker controller (1) for controlling a loudspeaker (2), configured to determine time-varying impedance information of the loudspeaker (2) based on a loudspeaker voltage and a measure of a loudspeaker current and provide for control of the loudspeaker (2) in accordance with said time-varying impedance information.Type: GrantFiled: May 18, 2017Date of Patent: November 21, 2017Assignee: NXP B.V.Inventors: Temujin Gautama, Alan OCinneide, Lutsen Ludgerus Albertus Hendrikus Dooper
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Publication number: 20170294888Abstract: An audio amplifier system is described comprising: a variable gain audio processor for processing digital audio signal, a digital to analog converter coupled to the audio processor, and configured to receive the processed digital audio signal, a variable gain amplifier having an input coupled to the output of the digital to analog converter and operably connected to a power supply, a controller coupled to the variable gain audio processor and the variable gain amplifier and configured to switch the audio amplifier system between a first operating mode having a first power supply voltage value and a second operating mode having a second higher power supply voltage value; wherein the controller is operable in the first operating mode to set the audio amplifier system gain to a desired gain value and in the second operating mode to maintain the desired gain value.Type: ApplicationFiled: April 6, 2017Publication date: October 12, 2017Inventors: Marco Berkhout, Lûtsen Ludgerus Albertus Hendrikus Dooper, Maarten van Dommelen, Han Martijn Schuurmans
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Publication number: 20170257686Abstract: A loudspeaker controller (1) for controlling a loudspeaker (2), configured to determine time-varying impedance information of the loudspeaker (2) based on a loudspeaker voltage and a measure of a loudspeaker current and provide for control of the loudspeaker (2) in accordance with said time-varying impedance information.Type: ApplicationFiled: May 18, 2017Publication date: September 7, 2017Inventors: Temujin Gautama, Alan OCinneide, Lutsen Ludgerus Albertus Hendrikus Dooper
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Patent number: 9674593Abstract: A loudspeaker controller (1) for controlling a loudspeaker (2), configured to determine time-varying impedance information of the loudspeaker (2) based on a loudspeaker voltage and a measure of a loudspeaker current and provide for control of the loudspeaker (2) in accordance with said time-varying impedance information.Type: GrantFiled: December 17, 2014Date of Patent: June 6, 2017Assignee: NXP B.V.Inventors: Temujin Gautama, Alan OCinneide, Lutsen Ludgerus Albertus Hendrikus Dooper
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Publication number: 20150181318Abstract: A loudspeaker controller (1) for controlling a loudspeaker (2), configured to determine time-varying impedance information of the loudspeaker (2) based on a loudspeaker voltage and a measure of a loudspeaker current and provide for control of the loudspeaker (2) in accordance with said time-varying impedance information.Type: ApplicationFiled: December 17, 2014Publication date: June 25, 2015Inventors: Temujin Gautama, Alan OCinneide, Lutsen Ludgerus Albertus Hendrikus Dooper
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Patent number: 8861748Abstract: Disclosed is a class D amplifier comprising a modulation stage having a first input for receiving an input signal and an output for producing a modulated version of the input signal; a plurality of power stages, each power stage being responsive to said modulation stage and comprising a first switch and a second switch coupled in series between a first voltage source and a second voltage source, each power stage comprising an output node between the first switch and the second switch; and a power stage control circuit for measuring the input signal level and enabling a selected number of the power stages as a function of the measured input signal level. A method for controlling such a class D amplifier is also disclosed.Type: GrantFiled: November 22, 2011Date of Patent: October 14, 2014Assignee: NXP B.V.Inventors: Lutsen Ludgerus Albertus Hendrikus Dooper, Marco Berkhout, Wilfred Repko
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Patent number: 8681853Abstract: A pulse density modulation, PDM, driver, outputs a PDM stream and can be switched to a control token. The switch takes place when the first integral of the PDM stream has a magnitude less than or equal to a first predetermined value and the second integral of the PDM stream has a magnitude less than or equal to a second predetermined value.Type: GrantFiled: March 9, 2011Date of Patent: March 25, 2014Assignee: NXP B.V.Inventor: Lûtsen Ludgerus Albertus Hendrikus Dooper
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Patent number: 8378745Abstract: A switching amplifier comprising: an output driving circuit (400) including a pair of switching transistors (M1, M2) connected in series between a pair of supply voltage lines (VP, gnd); a switch driver circuit (204a) configured to drive the switching transistors (M1, M2) with first and second respective PWM signals dependent on an input signal (101); an output connection between the pair of transistors (M1, M2) for driving an output load (403); and an output current sensing circuit for measuring a current through the output load, the output current sensing circuit comprising: a current sensing resistor (401a) connected between a first one (M2) of the pair of transistors and an adjacent supply voltage line (gnd); and a voltage sense circuit (404) connected across the current sensing resistor, wherein the voltage sense circuit is configured to sample a voltage across the current sensing resistor (401a) at a midpoint of successive corresponding portions of one of the PWM signals.Type: GrantFiled: July 14, 2010Date of Patent: February 19, 2013Assignee: NXP B.V.Inventors: Lutsen Ludgerus Albertus Hendrikus Dooper, Gerrit Dijkstra
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Publication number: 20120134514Abstract: Disclosed is a class D amplifier comprising a modulation stage having a first input for receiving an input signal and an output for producing a modulated version of the input signal; a plurality of power stages, each power stage being responsive to said modulation stage and comprising a first switch and a second switch coupled in series between a first voltage source and a second voltage source, each power stage comprising an output node between the first switch and the second switch; and a power stage control circuit for measuring the input signal level and enabling a selected number of the power stages as a function of the measured input signal level. A method for controlling such a class D amplifier is also disclosed.Type: ApplicationFiled: November 22, 2011Publication date: May 31, 2012Applicant: NXP B.V.Inventors: Lutsen Ludgerus Albertus Hendrikus Dooper, Marco Berkhout, Wilfred Repko
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Publication number: 20110221540Abstract: A pulse density modulation, PDM, driver, outputs a PDM stream and can be switched to a control token. The switch takes place when the first integral of the PDM stream has a magnitude less than or equal to a first predetermined value and the second integral of the PDM stream has a magnitude less than or equal to a second predetermined value.Type: ApplicationFiled: March 9, 2011Publication date: September 15, 2011Applicant: NXP B.V.Inventor: Lûtsen Ludgerus Albertus Hendrikus DOOPER
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Publication number: 20110012677Abstract: A switching amplifier comprising: an output driving circuit (400) including a pair of switching transistors (M1, M2) connected in series between a pair of supply voltage lines (VP, gnd); a switch driver circuit (204a) configured to drive the switching transistors (M1, M2) with first and second respective PWM signals dependent on an input signal (101); an output connection between the pair of transistors (M1, M2) for driving an output load (403); and an output current sensing circuit for measuring a current through the output load, the output current sensing circuit comprising: a current sensing resistor (401a) connected between a first one (M2) of the pair of transistors and an adjacent supply voltage line (gnd); and a voltage sense circuit (404) connected across the current sensing resistor, wherein the voltage sense circuit is configured to sample a voltage across the current sensing resistor (401a) at a midpoint of successive corresponding portions of one of the PWM signals.Type: ApplicationFiled: July 14, 2010Publication date: January 20, 2011Applicant: NXP B.V.Inventors: Lutsen Ludgerus Albertus Hendrikus Dooper, Gerrit Dijkstra
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Publication number: 20090315623Abstract: A class D amplifier (1) comprises an input unit (11) for receiving a digital input signal (Vin), a pulse shaping unit (12) for producing pulse shaped signals in dependence of the input signal (Vin), a comparator unit (13) for comparing the pulse shaped signals and producing a comparator signal, a driver unit (14) for producing driver signals in dependence of the comparator signal, a switching output unit (15) for producing a pulse width modulated output signal (Vout) in dependence of the driver signals, and a feedback unit (16) for feeding the output signal (Vout) back to the pulse shaping unit (12). The input unit (11) comprises a clipping control unit (10) for controlling the duty cycle of the pulse width modulated output signal (Vout).Type: ApplicationFiled: July 4, 2007Publication date: December 24, 2009Applicant: NXP B.V.Inventors: Lutsen Ludgerus Albertus Hendrikus Dooper, Marco Berkhout