Patents by Inventor Theis Buchwald Christiansen

Theis Buchwald Christiansen 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).

  • Thermal control of voice coils in loudspeakers
    Patent number: 8774419
    Abstract: In an embodiment of the invention, the voice coil of an electro dynamic transducer is protected against thermal overload by estimating the temperature of a magnet in the electro dynamic transducer. When a power limit based on the temperature of the magnet and on a predetermined voice coil temperature limit is reached by an audio signal, the power applied to the voice coil is reduced.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: July 8, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Lars Risbo, Milind Anil Borkar, Theis Buchwald Christiansen
  • Thermal Control of Voice Coils in Loudspeakers
    Publication number: 20130077794
    Abstract: In an embodiment of the invention, the voice coil of an electro dynamic transducer is protected against thermal overload by estimating the temperature of a magnet in the electro dynamic transducer. When a power limit based on the temperature of the magnet and on a predetermined voice coil temperature limit is reached by an audio signal, the power applied to the voice coil is reduced.
    Type: Application
    Filed: September 28, 2011
    Publication date: March 28, 2013
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Lars Risbo, Milind Anil Borkar, Theis Buchwald Christiansen
  • Over-Excursion Protection for Loudspeakers
    Publication number: 20130077795
    Abstract: In an embodiment of the invention, over-excursion of a diaphragm in an electro dynamic transducer is reduced by attenuating low frequency content in an audio signal when the power of an audio signal exceeds a predetermined power limit. The audio signal is used to drive the input of an amplifier and the output of the amplifier drives the electro dynamic transducer. When the audio signal does not exceed a predetermined power limit, the low frequency content in the input audio signal is amplified.
    Type: Application
    Filed: September 28, 2011
    Publication date: March 28, 2013
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Lars Risbo, Milind Anil Borkar, Theis Buchwald Christiansen
  • Thermal Protection for Loudspeakers
    Publication number: 20130077796
    Abstract: In an embodiment of the invention, the voice coil of an electro dynamic transducer is protected by measuring the power of the input audio signal. When a predetermined power limit is reached by the input audio signal, the power of the input audio signal is reduced.
    Type: Application
    Filed: September 28, 2011
    Publication date: March 28, 2013
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Lars Risbo, Milind Anil Borkar, Theis Buchwald Christiansen, Wendyam Fernand David Traore