Patents by Inventor Stephen D. Julstrom

Stephen D. Julstrom 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).

  • Publication number: 20210257981
    Abstract: An integrated system for hearing protection and enhancement having earpieces including microphones and receivers to provide for user control of ambience level (mic gain), monitor input, control over limiting of excessive levels, and frequency equalization, all with very wide input dynamic range capability and controlled output dynamic range. The user control comprises a wired or wireless smartphone app. Also, the wide input dynamic range is achieved by placement of limiter circuitry capable of handling the entire input dynamic range prior to the most dynamic range limited circuit blocks: digital EQ block, output amplifier, earpiece receiver, and the users' ears. Switches allow combining left and right signals to be directed to a user's favored ear, if necessary.
    Type: Application
    Filed: February 15, 2021
    Publication date: August 19, 2021
    Inventors: Stephen D. Julstrom, Michael J. Santucci
  • Patent number: 11095965
    Abstract: Systems and methods for reducing wind noise in an electronic hearing protector are provided. The electronic hearing protector includes a housing and a windscreen. The housing includes a cut-out portion having at least one acoustic inlet. The windscreen covers the cut-out portion and includes an outer surface. An acoustic path within the cut-out portion from an effective center of the acoustic inlet(s) to the windscreen is at least 100 degrees. A minimum distance from the effective center of the acoustic inlet(s) to the outer surface of the windscreen is at least 2.5 millimeters. In various embodiments, the electronic hearing protector may include a high-level limiter disposed in the housing. The high-level limiter selectively attenuates a frequency below a voice range more than a frequency in the voice range of a microphone input signal to provide a signal output with noise reduction at frequencies outside of the voice range.
    Type: Grant
    Filed: August 14, 2020
    Date of Patent: August 17, 2021
    Assignee: ETYMOTIC RESEARCH, INC.
    Inventors: Stephen D. Julstrom, Tim Monroe, Charles Aldous
  • Publication number: 20200374612
    Abstract: Systems and methods for reducing wind noise in an electronic hearing protector are provided. The electronic hearing protector includes a housing and a windscreen. The housing includes a cut-out portion having at least one acoustic inlet. The windscreen covers the cut-out portion and includes an outer surface. An acoustic path within the cut-out portion from an effective center of the acoustic inlet(s) to the windscreen is at least 100 degrees. A minimum distance from the effective center of the acoustic inlet(s) to the outer surface of the windscreen is at least 2.5 millimeters. In various embodiments, the electronic hearing protector may include a high-level limiter disposed in the housing. The high-level limiter selectively attenuates a frequency below a voice range more than a frequency in the voice range of a microphone input signal to provide a signal output with noise reduction at frequencies outside of the voice range.
    Type: Application
    Filed: August 14, 2020
    Publication date: November 26, 2020
    Inventors: Stephen D. Julstrom, Tim Monroe, Charles Aldous
  • Patent number: 10779069
    Abstract: Systems and methods for reducing wind noise in an electronic hearing protector are provided. The electronic hearing protector includes a housing and a windscreen. The housing includes a cut-out portion having at least one acoustic inlet. The windscreen covers the cut-out portion and includes an outer surface. An acoustic path within the cut-out portion from an effective center of the acoustic inlet(s) to the windscreen is at least 100 degrees. A minimum distance from the effective center of the acoustic inlet(s) to the outer surface of the windscreen is at least 2.5 millimeters. In various embodiments, the electronic hearing protector may include a high-level limiter disposed in the housing. The high-level limiter selectively attenuates a frequency below a voice range more than a frequency in the voice range of a microphone input signal to provide a signal output with noise reduction at frequencies outside of the voice range.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: September 15, 2020
    Assignee: ETYMOTIC RESEARCH, INC.
    Inventors: Stephen D. Julstrom, Tim Monroe, Charles Aldous
  • Patent number: 10476609
    Abstract: A system and/or method is provided for enhanced listening of audio signals acquired via a telecoil by performing hum filtering. The system may include a telecoil and a telecoil hum filter. The telecoil hum filter may include a comb notch filter. The comb notch filter may include a delay module and a comb notch filter summing module. The telecoil may be operable to receive a magnetic signal and convert the magnetic signal to an input audio signal. The delay module of the comb notch filter may be configured to generate a delayed signal by applying a delay to the input audio signal. The delay may be based on a fundamental hum frequency. The comb notch filter summing module may be configured to generate a comb notch filter output signal by adding the input audio signal and the delay signal.
    Type: Grant
    Filed: November 21, 2017
    Date of Patent: November 12, 2019
    Assignee: ETYMOTIC RESEARCH, INC.
    Inventor: Stephen D. Julstrom
  • Publication number: 20190182575
    Abstract: Systems and methods for reducing wind noise in an electronic hearing protector are provided. The electronic hearing protector includes a housing and a windscreen. The housing includes a cut-out portion having at least one acoustic inlet. The windscreen covers the cut-out portion and includes an outer surface. An acoustic path within the cut-out portion from an effective center of the acoustic inlet(s) to the windscreen is at least 100 degrees. A minimum distance from the effective center of the acoustic inlet(s) to the outer surface of the windscreen is at least 2.5 millimeters. In various embodiments, the electronic hearing protector may include a high-level limiter disposed in the housing. The high-level limiter selectively attenuates a frequency below a voice range more than a frequency in the voice range of a microphone input signal to provide a signal output with noise reduction at frequencies outside of the voice range.
    Type: Application
    Filed: November 30, 2018
    Publication date: June 13, 2019
    Inventors: Stephen D. Julstrom, Tim Monroe, Charles Aldous
  • Publication number: 20180091238
    Abstract: A system and/or method is provided for enhanced listening of audio signals acquired via a telecoil by performing hum filtering. The system may include a telecoil and a telecoil hum filter. The telecoil hum filter may include a comb notch filter. The comb notch filter may include a delay module and a comb notch filter summing module. The telecoil may be operable to receive a magnetic signal and convert the magnetic signal to an input audio signal. The delay module of the comb notch filter may be configured to generate a delayed signal by applying a delay to the input audio signal. The delay may be based on a fundamental hum frequency. The comb notch filter summing module may be configured to generate a comb notch filter output signal by adding the input audio signal and the delay signal.
    Type: Application
    Filed: November 21, 2017
    Publication date: March 29, 2018
    Inventor: Stephen D. Julstrom
  • Patent number: 9859990
    Abstract: A system and/or method is provided for enhanced listening of audio signals acquired via a telecoil by performing hum filtering. The system may include a telecoil and a telecoil hum filter. The telecoil hum filter may include a comb notch filter. The comb notch filter may include a delay module and a comb notch filter summing module. The telecoil may be operable to receive a magnetic signal and convert the magnetic signal to an input audio signal. The delay module of the comb notch filter may be configured to generate a delayed signal by applying a delay to the input audio signal. The delay may be based on a fundamental hum frequency. The comb notch filter summing module may be configured to generate a comb notch filter output signal by adding the input audio signal and the delay signal.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: January 2, 2018
    Assignee: ETYMOTIC RESEARCH, INC.
    Inventor: Stephen D. Julstrom
  • Publication number: 20160323043
    Abstract: A system and/or method is provided for enhanced listening of audio signals acquired via a telecoil by performing hum filtering. The system may include a telecoil and a telecoil hum filter. The telecoil hum filter may include a comb notch filter. The comb notch filter may include a delay module and a comb notch filter summing module. The telecoil may be operable to receive a magnetic signal and convert the magnetic signal to an input audio signal. The delay module of the comb notch filter may be configured to generate a delayed signal by applying a delay to the input audio signal. The delay may be based on a fundamental hum frequency. The comb notch filter summing module may be configured to generate a comb notch filter output signal by adding the input audio signal and the delay signal.
    Type: Application
    Filed: April 28, 2016
    Publication date: November 3, 2016
    Inventor: Stephen D. Julstrom
  • Patent number: 9232292
    Abstract: Certain embodiments provide an in-the-ear device. The in-the-ear device includes a housing including a microphone inlet. The in-the-ear device also includes a microphone and a windscreen. The microphone is disposed within the housing adjacent to the microphone inlet. The windscreen includes a porous screen and an attachment mechanism coupled to the porous screen. The attachment mechanism is configured to detachably couple to the housing surrounding a perimeter of the microphone inlet such that an acoustic seal is formed between the windscreen and the housing.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: January 5, 2016
    Assignee: ETYMOTIC RESEARCH, INC.
    Inventors: Andrew J. Haapapuro, Stephen D. Julstrom, Viorel Drambarean, Timothy Scott Monroe
  • Publication number: 20140254852
    Abstract: Certain embodiments provide an in-the-ear device. The in-the-ear device includes a housing including a microphone inlet. The in-the-ear device also includes a microphone and a windscreen. The microphone is disposed within the housing adjacent to the microphone inlet. The windscreen includes a porous screen and an attachment mechanism coupled to the porous screen. The attachment mechanism is configured to detachably couple to the housing surrounding a perimeter of the microphone inlet such that an acoustic seal is formed between the windscreen and the housing.
    Type: Application
    Filed: February 25, 2014
    Publication date: September 11, 2014
    Applicant: Etymotic Research Inc.
    Inventors: Andrew J. Haapapuro, Stephen D. Julstrom, Viorel Drambarean, Timothy Scott Monroe
  • Patent number: 8460816
    Abstract: Rechargeable battery assemblies and methods of constructing rechargeable battery assemblies are provided. Rechargeable battery assemblies can include a storage cell and receive circuitry comprising a receive coil operatively connected to receive control circuitry, the receive coil configured to receive inductively coupled current, the receive control circuitry configured to rectify the current and communicate charging power to the storage cell, the coil wound around a shield/core comprising magnetically permeable material, and the shield/core disposed around the storage cell.
    Type: Grant
    Filed: October 8, 2009
    Date of Patent: June 11, 2013
    Assignee: Etymotic Research, Inc.
    Inventors: Stephen D. Julstrom, Timothy S. Monroe, Mead C. Killion, John E. Oltman
  • Patent number: 8160261
    Abstract: An earphone monitoring system is disclosed that provides for user information and control regarding ambient and monitored sound levels.
    Type: Grant
    Filed: January 18, 2006
    Date of Patent: April 17, 2012
    Assignee: Sensaphonics, Inc.
    Inventors: Robert B. Schulein, Stephen D. Julstrom, Michael J. Santucci
  • Publication number: 20110084654
    Abstract: Inductively coupled battery charging systems and methods are provided. Transmit circuitry can include a transmit coil operatively part of a transmit resonant circuit that exhibits resonance at a transmit resonant frequency and an unloaded Q value of at least about 20. Transmit coil can generate a magnetic field at about the transmit resonant frequency. Rechargeable battery assembly can include a receive coil configured to receive inductively coupled current, and circuitry configured to rectify the current and communicate charging power to a storage cell. Receive coil can be part of a receive resonant circuit that exhibits resonance at about the transmit resonant frequency. Transmit circuitry can be configured to detect the rechargeable battery assembly by monitoring a load on the transmit coil.
    Type: Application
    Filed: October 8, 2009
    Publication date: April 14, 2011
    Applicant: ETYMOTIC RESEARCH INC.
    Inventors: Stephen D. Julstrom, Timothy S. Monroe
  • Publication number: 20110086256
    Abstract: Rechargeable battery assemblies and methods of constructing rechargeable battery assemblies are provided. Rechargeable battery assemblies can include a storage cell and receive circuitry comprising a receive coil operatively connected to receive control circuitry, the receive coil configured to receive inductively coupled current, the receive control circuitry configured to rectify the current and communicate charging power to the storage cell, the coil wound around a shield/core comprising magnetically permeable material, and the shield/core disposed around the storage cell.
    Type: Application
    Filed: October 8, 2009
    Publication date: April 14, 2011
    Applicant: ETYMOTIC RESEARCH INC.
    Inventors: Stephen D. Julstrom, Timothy S. Monroe, Mead C. Killion, John E. Oltman
  • Publication number: 20110084752
    Abstract: Systems and methods for maintaining a drive signal to a resonant circuit at a resonant frequency are provided. A system for maintaining a drive signal to a resonant circuit at a resonant frequency can include: an oscillator configured to provide an output to a phase comparator and a drive circuit, the drive circuit configured to provide a drive signal to a resonant circuit; a phase detector configured to receive a filtered version of the drive signal from the resonant circuit and provide a phase-indicating signal to the phase comparator; and the phase comparator, wherein the phase comparator is configured to provide a signal based on the phase difference between the oscillator output and the phase-indicating signal, wherein the signal from the phase comparator is used to control the frequency of the oscillator such that the phase difference converges to a fixed value.
    Type: Application
    Filed: October 8, 2009
    Publication date: April 14, 2011
    Applicant: ETYMOTIC RESEARCH INC.
    Inventors: Stephen D. Julstrom, Timothy S. Monroe
  • Publication number: 20110084652
    Abstract: Inductively coupled battery charging systems and methods are provided. Transmit circuitry can include a transmit coil operatively part of a transmit resonant circuit that exhibits resonance at a transmit resonant frequency and an unloaded Q value of at least about 20. Transmit coil can generate a magnetic field at about the transmit resonant frequency. Rechargeable battery assembly can include a receive coil configured to receive inductively coupled current, and circuitry configured to rectify the current and communicate charging power to a storage cell. Receive coil can be part of a receive resonant circuit that exhibits resonance at about the transmit resonant frequency and an unloaded Q value of at least about 10. Transmit circuitry can include multiple transmit coils and can selectively discontinue production of alternating current in the coils generating fields that are not most strongly coupled to the receive coil.
    Type: Application
    Filed: October 8, 2009
    Publication date: April 14, 2011
    Applicant: ETYMOTIC RESEARCH INC.
    Inventors: Stephen D. Julstrom, Timothy S. Monroe
  • Publication number: 20110084653
    Abstract: Inductively coupled battery charging systems and methods are provided. Transmit circuitry can include a transmit coil operatively part of a transmit resonant circuit exhibiting resonance at a transmit resonant frequency and an unloaded Q value of at least about 20. Transmit coil can generate a magnetic field at about the transmit resonant frequency. Rechargeable battery assembly can include a receive coil configured to receive inductively coupled current, and circuitry configured to rectify the current and communicate charging power to a storage cell. Receive coil can be part of a receive resonant circuit that exhibits resonance at about the transmit resonant frequency. Transmit circuitry can be configured to regulate alternating current produced in the transmit coil based on current flowing in the transmit resonant circuit and/or maintain the magnetic field at about the transmit resonant frequency by maintaining about a ninety degree phase shift between a square wave input and output.
    Type: Application
    Filed: October 8, 2009
    Publication date: April 14, 2011
    Applicant: ETYMOTIC RESEARCH INC.
    Inventors: Stephen D. Julstrom, Timothy S. Monroe
  • Patent number: 7522740
    Abstract: A hearing improvement device using a multi-coil coupling system and methods for operating such a device are disclosed. An embodiment of the present invention may use an array microphone to provide highly directional reception. The received audio signal may be filtered, amplified, and converted into a magnetic field for coupling to the telecoil in a conventional hearing aid. Multiple transmit inductors may be used to effectively couple to both in-the-ear and behind-the-ear type hearing aids, and an additional embodiment is disclosed which may be used with an earphone, for users not requiring a hearing aid.
    Type: Grant
    Filed: February 1, 2006
    Date of Patent: April 21, 2009
    Assignee: Etymotic Research, Inc.
    Inventors: Stephen D. Julstrom, Viorel Drambarean, Willem Soede
  • Patent number: 7110553
    Abstract: A directional microphone assembly suitable for subsurface mounting. A directional pickup pattern is developed from the outputs of a plurality of omnidirectional microphone elements mounted in an assembly behind a surface such that their acoustic excitation comes from the opposite side of the surface through small openings in the surface. The openings may have varying dimensions and may be covered with acoustically semi-transparent material without significantly degrading the assembly frequency response or polar pattern. Precautions are taken to ensure design robustness considering practical microphone element characteristics and potential high levels of low-frequency excitation.
    Type: Grant
    Filed: February 3, 1998
    Date of Patent: September 19, 2006
    Assignee: Etymotic Research, Inc.
    Inventors: Stephen D. Julstrom, Robert B. Schulein