Patents by Inventor Lennart Stahl
Lennart Stahl 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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Publication number: 20200272239Abstract: An integrated haptic system may include a digital signal processor and an amplifier communicatively coupled to the digital signal processor and integrated with the digital signal processor into the integrated haptic system. The digital signal processor may be configured to receive a force sensor signal indicative of a force applied to a force sensor and generate a haptic playback signal responsive to the force. The amplifier may be configured to amplify the haptic playback signal and drive a vibrational actuator communicatively coupled to the amplifier with the haptic playback signal as amplified by the amplifier.Type: ApplicationFiled: May 11, 2020Publication date: August 27, 2020Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Harsha RAO, Rong HU, Carl Lennart STÅHL, Jie SU, Vadim KONRADI, Teemu RAMO, Anthony Stephen DOY
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Patent number: 10732714Abstract: An integrated haptic system may include a digital signal processor and an amplifier communicatively coupled to the digital signal processor and integrated with the digital signal processor into the integrated haptic system. The digital signal processor may be configured to receive a force sensor signal indicative of a force applied to a force sensor and generate a haptic playback signal responsive to the force. The amplifier may be configured to amplify the haptic playback signal and drive a vibrational actuator communicatively coupled to the amplifier with the haptic playback signal as amplified by the amplifier.Type: GrantFiled: October 2, 2017Date of Patent: August 4, 2020Assignee: Cirrus Logic, Inc.Inventors: Harsha Rao, Rong Hu, Carl Lennart Ståhl, Jie Su, Vadim Konradi, Teemu Ramo, Anthony Stephen Doy
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Publication number: 20200204913Abstract: Embodiments described herein relate to methods and apparatus for limiting the excursion of a transducer. The method comprises receiving a transducer signal; and limiting the transducer signal or a signal derived therefrom to generate a limited transducer signal for input into the transducer such that an electrical response caused by the limited transducer signal in an electrical model of the transducer would be less than a threshold electrical response, wherein the threshold electrical response has been determined by: inputting a stimulus input signal into the electrical model of the transducer, wherein the stimulus input signal is designed to cause the transducer to reach a maximum excursion; and determining the threshold electrical response as a maximum of the electrical response caused by the stimulus input signal in the electrical model of the transducer.Type: ApplicationFiled: February 27, 2020Publication date: June 25, 2020Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Carl Lennart STÅHL, Ning LI, Ziyan ZOU
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Publication number: 20200183644Abstract: A nonlinear control system and a speaker protection system are disclosed. In particular, a control system for adapting an audio output from a speaker in the proximity of an object is disclosed. The controller is configured to accept one or more input signals, and one or more estimated states produced by the model to produce one or more control signals. A speaker protection system and a quality control system are disclosed. More particularly, a system for clamping the input to a speaker dependent upon an estimate of the proximity, acoustic volume, and/or acoustic coupling of the speaker to a nearby object is disclosed.Type: ApplicationFiled: February 12, 2020Publication date: June 11, 2020Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Pär Gunnars RISBERG, Carl Lennart STÅHL, Landy TOTH
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Patent number: 10667051Abstract: Embodiments described herein relate to methods and apparatus for limiting the excursion of a transducer. The method comprises receiving a transducer signal; and limiting the transducer signal or a signal derived therefrom to generate a limited transducer signal for input into the transducer such that an electrical response caused by the limited transducer signal in an electrical model of the transducer would be less than a threshold electrical response, wherein the threshold electrical response has been determined by: inputting a stimulus input signal into the electrical model of the transducer, wherein the stimulus input signal is designed to cause the transducer to reach a maximum excursion; and determining the threshold electrical response as a maximum of the electrical response caused by the stimulus input signal in the electrical model of the transducer.Type: GrantFiled: December 18, 2018Date of Patent: May 26, 2020Assignee: Cirrus Logic, Inc.Inventor: Carl Lennart Stahl
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Patent number: 10599389Abstract: A nonlinear control system and a speaker protection system are disclosed. In particular, a control system for adapting an audio output from a speaker in the proximity of an object is disclosed. The controller is configured to accept one or more input signals, and one or more estimated states produced by the model to produce one or more control signals. A speaker protection system and a quality control system are disclosed. More particularly, a system for clamping the input to a speaker dependent upon an estimate of the proximity, acoustic volume, and/or acoustic coupling of the speaker to a nearby object is disclosed.Type: GrantFiled: November 28, 2018Date of Patent: March 24, 2020Assignee: Cirrus Logic, Inc.Inventors: Pär Gunnars Risberg, Carl Lennart Stahl, Landy Toth
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Publication number: 20190297418Abstract: Embodiments described herein relate to methods and apparatus for limiting the excursion of a transducer. The method comprises receiving a transducer signal; and limiting the transducer signal or a signal derived therefrom to generate a limited transducer signal for input into the transducer such that an electrical response caused by the limited transducer signal in an electrical model of the transducer would be less than a threshold electrical response, wherein the threshold electrical response has been determined by: inputting a stimulus input signal into the electrical model of the transducer, wherein the stimulus input signal is designed to cause the transducer to reach a maximum excursion; and determining the threshold electrical response as a maximum of the electrical response caused by the stimulus input signal in the electrical model of the transducer.Type: ApplicationFiled: December 18, 2018Publication date: September 26, 2019Applicant: Cirrus Logic International Semiconductor Ltd.Inventor: Carl Lennart STAHL
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Publication number: 20190295755Abstract: A method may include generating an electrical drive waveform associated with a target actuator by stretching or compressing a reference drive waveform associated with a reference actuator in a time domain of the reference drive waveform in accordance with a time adjustment factor, wherein the time adjustment factor is determine based on a difference between a resonant frequency of the target actuator and a resonant frequency of the reference actuator. The same or another method may include generating an electrical drive waveform associated with a target actuator by increasing or decreasing an amplitude of a reference drive waveform associated with a reference actuator in accordance with an amplitude adjustment factor, wherein the amplitude adjustment factor is determined based on a difference between a resonant frequency of the target actuator and a resonant frequency of the reference actuator.Type: ApplicationFiled: August 27, 2018Publication date: September 26, 2019Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Vadim KONRADI, Carl Lennart STÅHL, Rong HU
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Patent number: 10338883Abstract: A nonlinear control system and a speaker protection system are disclosed. In particular, a control system for adapting an audio output from a speaker in the proximity of an object is disclosed. The controller is configured to accept one or more input signals, and one or more estimated states produced by the model to produce one or more control signals. A speaker protection system and a quality control system are disclosed. More particularly, a system for clamping the input to a speaker dependent upon an estimate of the proximity, acoustic volume, and/or acoustic coupling of the speaker to a nearby object is disclosed.Type: GrantFiled: May 20, 2016Date of Patent: July 2, 2019Assignee: Cirrus Logic, Inc.Inventors: Pär Gunnars Risberg, Carl Lennart Stahl, Landy Toth
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Publication number: 20190129687Abstract: A nonlinear control system and a speaker protection system are disclosed. In particular, a control system for adapting an audio output from a speaker in the proximity of an object is disclosed. The controller is configured to accept one or more input signals, and one or more estimated states produced by the model to produce one or more control signals. A speaker protection system and a quality control system are disclosed. More particularly, a system for clamping the input to a speaker dependent upon an estimate of the proximity, acoustic volume, and/or acoustic coupling of the speaker to a nearby object is disclosed.Type: ApplicationFiled: November 28, 2018Publication date: May 2, 2019Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Pär Gunnars RISBERG, Carl Lennart STAHL, Landy TOTH
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Publication number: 20180321748Abstract: An integrated haptic system may include a digital signal processor and an amplifier communicatively coupled to the digital signal processor and integrated with the digital signal processor into the integrated haptic system. The digital signal processor may be configured to receive a force sensor signal indicative of a force applied to a force sensor and generate a haptic playback signal responsive to the force. The amplifier may be configured to amplify the haptic playback signal and drive a vibrational actuator communicatively coupled to the amplifier with the haptic playback signal as amplified by the amplifier.Type: ApplicationFiled: October 2, 2017Publication date: November 8, 2018Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Harsha RAO, Rong HU, Carl Lennart STÅHL, Jie SU, Vadim KONRADI, Teemu RAMO, Anthony Stephen Doy
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Publication number: 20180136899Abstract: A nonlinear control system and a speaker protection system are disclosed. In particular, a control system for adapting an audio output from a speaker in the proximity of an object is disclosed. The controller is configured to accept one or more input signals, and one or more estimated states produced by the model to produce one or more control signals. A speaker protection system and a quality control system are disclosed. More particularly, a system for clamping the input to a speaker dependent upon an estimate of the proximity, acoustic volume, and/or acoustic coupling of the speaker to a nearby object is disclosed.Type: ApplicationFiled: May 20, 2016Publication date: May 17, 2018Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Pär Gunnars RISBERG, Carl Lennart STAHL, Landy TOTH
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Patent number: 6854659Abstract: A system for cooling heat generating objects arranged in a room. The system adapts in real time to changing cooling demands of the objects. Remote sensors mounted in proximity to the heat generating objects relay information to cooling units, which adjust their operation in response to the information.Type: GrantFiled: September 23, 2002Date of Patent: February 15, 2005Assignee: KLiebert CorporationInventors: Lennart Stahl, Christian Belady
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Patent number: 6705389Abstract: A method and system are disclosed for cooling a heat generating object. A coolant is passed through a heat exchanger so that heated air passing through a first portion of the heat exchanger is cooled. A fan unit is selectively positioned relative to the heat exchanger. When activated, the fan unit draws the cooled air through a second portion of the heat exchanger and directs the twice cooled air towards the heat generating object. The fan unit may be repositioned along a different portion of the heat exchanger so as to redefine the flow of air drawn from and directed towards the heat generating object.Type: GrantFiled: July 17, 2000Date of Patent: March 16, 2004Assignee: Emerson Electric Co.Inventors: Lennart Stahl, Christian Belady
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Patent number: 6644384Abstract: A method and system for high density modular cooling system is disclosed. Cooling coils and fans are interleaved so as to cover all usable space with the enclosed area behind the interleaved cooling coils and fans acting as a plenum. A cooling fluid is circulated through the cooling coils by the interleaved fans.Type: GrantFiled: September 23, 2002Date of Patent: November 11, 2003Assignee: Liebert CorporationInventor: Lennart Stahl
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Patent number: 6564858Abstract: A method and system are disclosed for cooling a heat generating object. A coolant is passed through a heat exchanger so that heated air passing through the heat exchanger is cooled. A fan unit is selectively positioned adjacent to a first side of the heat exchanger. When activated, the fan unit draws the cooled air through the heat exchanger and directs the cooled air towards the heat generating object. The fan unit may be repositioned along a second side of the heat exchanger so as to redefine the flow of air drawn from and directed towards the heat generating object.Type: GrantFiled: July 17, 2000Date of Patent: May 20, 2003Assignee: Liebert CorporationInventors: Lennart Stahl, Christian Belady
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Patent number: 6557624Abstract: A method and system are disclosed for cooling a room having one or more heat generating objects. A number of heat exchangers are disposed adjacent a floor or ceiling and extends substantially entirely or partially between the walls of the room. A fan unit is disposed adjacent the heat exchanger and draws or blows cooled air from the heat exchanger and directs the drawn air into the room. The fan unit is capable of being repositioned along a different portion of the heat exchanger so as to redefine the flow of cooled air into the room. The cooling system components are modularized enabling configuration of a number of components to cool a room.Type: GrantFiled: August 9, 2000Date of Patent: May 6, 2003Assignee: Liebert CorporationInventors: Lennart Stahl, Christian L. Belady
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Publication number: 20030079490Abstract: A method and system for high density modular cooling system is disclosed. Cooling coils and fans are interleaved so as to cover all usable space with the enclosed area behind the interleaved cooling coils and fans acting as a plenum. A cooling fluid is circulated through the cooling coils by the interleaved fans.Type: ApplicationFiled: September 23, 2002Publication date: May 1, 2003Inventor: Lennart Stahl
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Publication number: 20030075313Abstract: A system for cooling heat generating objects arranged in a room. The system adapts in real time to changing cooling demands of the objects. Remote sensors mounted in proximity to the heat generating objects relay information to cooling units, which adjust their operation in response to the information.Type: ApplicationFiled: September 23, 2002Publication date: April 24, 2003Inventors: Lennart Stahl, Christian Belady
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Patent number: 6305406Abstract: A spray hood device for containing a fluid spray leak in a fluid-based cooling system. A cover member surrounds a given component subject to a fluid spray leak, containing fluid sprays, preventing the fluid sprays from reaching equipment therebelow and minimizing fluid leakage damage.Type: GrantFiled: June 2, 1998Date of Patent: October 23, 2001Assignees: Emerson Electric Co., AT&TInventors: Lennart Ståhl, John Francis Wallace, Jr., John Cardenas Parraz, Montford Henry Clark, David Winn