Patents by Inventor Alan J. Seefeldt

Alan J. Seefeldt 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).

  • Patent number: 10728692
    Abstract: Embodiments are directed to upward-firing speakers that reflect sound off a ceiling to a listening location at a distance from a speaker. The reflected sound provides height cues to reproduce audio objects that have overhead audio components. A virtual height filter based on a directional hearing model is applied to the upward-firing driver signal to improve the perception of height for audio signals transmitted by the virtual height speaker to provide optimum reproduction of the overhead reflected sound. The upward firing driver is tilted at an inclination angle of approximately 20 degrees to the horizontal axis of the speaker and separate height and direct terminal connections are provided to interface to an adaptive audio rendering system.
    Type: Grant
    Filed: June 25, 2019
    Date of Patent: July 28, 2020
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Brett G. Crockett, Alan J. Seefeldt, C. Phillip Brown
  • Patent number: 10707824
    Abstract: Volume leveler controller and controlling method are disclosed. In one embodiment, A volume leveler controller includes an audio content classifier for identifying the content type of an audio signal in real time; and an adjusting unit for adjusting a volume leveler in a continuous manner based on the content type as identified. The adjusting unit may configured to positively correlate the dynamic gain of the volume leveler with informative content types of the audio signal, and negatively correlate the dynamic gain of the volume leveler with interfering content types of the audio signal.
    Type: Grant
    Filed: July 12, 2019
    Date of Patent: July 7, 2020
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Jun Wang, Lie Lu, Alan J. Seefeldt
  • Patent number: 10680569
    Abstract: Distortion reducing multi-band compressor with timbre preservation is provided. Timbre preservation is achieved by determining a time-varying threshold in each of a plurality frequency bands as a function of a respective fixed threshold for the frequency band and, at least in part, an audio signal level and a fixed threshold outside such frequency band. If a particular frequency band receives significant gain reduction due to being above or approaching its fixed threshold, then a time-varying threshold of one or more other frequency bands are also decreased to receive some gain reduction. In a specific embodiment, time-varying thresholds can be computed from an average difference of the audio input signal in each frequency band and its respective fixed threshold.
    Type: Grant
    Filed: February 26, 2019
    Date of Patent: June 9, 2020
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Alan J. Seefeldt
  • Patent number: 10659899
    Abstract: Embodiments are directed to a method of rendering adaptive audio by receiving input audio comprising channel-based audio, audio objects, and dynamic objects, wherein the dynamic objects are classified as sets of low-priority dynamic objects and high-priority dynamic objects, rendering the channel-based audio, the audio objects, and the low-priority dynamic objects in a first rendering processor of an audio processing system, and rendering the high-priority dynamic objects in a second rendering processor of the audio processing system. The rendered audio is then subject to virtualization and post-processing steps for playback through soundbars and other similar limited height capable speakers.
    Type: Grant
    Filed: December 19, 2018
    Date of Patent: May 19, 2020
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Joshua Brandon Lando, Freddie Sanchez, Alan J Seefeldt
  • Publication number: 20200144979
    Abstract: In some embodiments, a method for processing an audio signal in an audio processing apparatus is disclosed. The method includes receiving an audio signal and a parameter, the parameter indicating a location of an auditory event boundary. An audio portion between consecutive auditory event boundaries constitutes an auditory event. The method further includes applying a modification to the audio signal based in part on an occurrence of the auditory event. The parameter may be generated by monitoring a characteristic of the audio signal and identifying a change in the characteristic.
    Type: Application
    Filed: December 29, 2019
    Publication date: May 7, 2020
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Brett G. CROCKETT, Alan J. SEEFELDT
  • Patent number: 10606550
    Abstract: In an audio encoder, for audio content received in a source audio format, default gains are generated based on a default dynamic range compression (DRC) curve, and non-default gains are generated for a non-default gain profile. Based on the default gains and non-default gains, differential gains are generated. An audio signal comprising the audio content, the default DRC curve, and differential gains is generated. In an audio decoder, the default DRC curve and the differential gains are identified from the audio signal. Default gains are re-generated based on the default DRC curve. Based on the combination of the re-generated default gains and the differential gains, operations are performed on the audio content extracted from the audio signal.
    Type: Grant
    Filed: April 17, 2019
    Date of Patent: March 31, 2020
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Jeroen Koppens, Jeffrey Riedmiller, Kristofer Kjoerling, Alexander Stahlmann, Holger Hoerich, Alan J. Seefeldt
  • Patent number: 10602294
    Abstract: An audio processing system and method which calculates, based on spatial metadata of the audio object, a panning coefficient for each of the audio objects in relation to each of a plurality of predefined channel coverage zones. Converts the audio signal into submixes in relation to the predefined channel coverage zones based on the calculated panning coefficients and the audio objects. Each of the submixes indicating a sum of components of the plurality of the audio objects in relation to one of the predefined channel coverage zones. Generating a submix gain by applying an audio processing to each of the submix and controls an object gain applied to each of the audio objects. The object gain being as a function of the panning coefficients for each of the audio objects and the submix gains in relation to each of the predefined channel coverage zones.
    Type: Grant
    Filed: March 28, 2019
    Date of Patent: March 24, 2020
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Alan J. Seefeldt, Lie Lu, Chen Zhang
  • Patent number: 10595128
    Abstract: Embodiments are directed to a virtual height filter for use with or in an upward-firing speaker system that reflects sound off a ceiling to a listening location at a distance from a speaker, and that provides height cues to reproduce audio objects that have overhead audio components. A virtual height filter based on a directional hearing model is applied to the upward-firing driver signal to improve the perception of height for audio signals transmitted by the virtual height speaker to provide optimum reproduction of the overhead reflected sound. The virtual height filter is provided by any one or combination of analog or digital filter circuits, or mechanical structures including speaker grill, enclosure, or driver design or configuration.
    Type: Grant
    Filed: June 4, 2019
    Date of Patent: March 17, 2020
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Michael J. Smithers, Brett G. Crockett, Alan J. Seefeldt, C. Phillip Brown
  • Patent number: 10586553
    Abstract: In an apparatus configured to perform signal processing on audio data of a first sampling rate, methods disclosed herein comprise receiving audio data of a second sampling rate, the second sampling rate being higher than the first sampling rate. The methods comprise applying filtering to the audio data of the second sampling rate to thereby produce first filtered audio data and second filtered audio data, the first filtered audio data comprising mainly component frequencies which are audible to the human ear, the second filtered audio data comprising mainly components frequencies which are substantially inaudible to the human ear. The methods further comprise applying first signal processing to the first filtered audio data; and applying second signal processing to the second filtered audio data, the second signal processing having a lower computational complexity than the first signal processing. Corresponding apparatus and computer readable media are also disclosed herein.
    Type: Grant
    Filed: September 21, 2016
    Date of Patent: March 10, 2020
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Nicholas L. Engel, Nicholas Luke Appleton, Alan J. Seefeldt
  • Publication number: 20200077178
    Abstract: Embodiments are directed to a speaker system that contains an array of multiple dispersion drivers that creates an expansive acoustic pattern to playback multi-channel audio content through a standalone speaker. The speaker system comprises an interface receiving stereo audio; an upmixer generating surround sound formatted audio from the stereo audio including one or more height channels; a virtualizer/downmixer component coupled to the upmixer and generating speaker feeds for two or more loudspeaker output sections, configured to play back the stereo audio, wherein each output section is further configured to play its own dedicated stereo audio signals; and a set of drivers each coupled to a respective output section and configured to project sound in at least two different dispersion patterns.
    Type: Application
    Filed: February 28, 2018
    Publication date: March 5, 2020
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Warren MANSFIELD, Alan J. SEEFELDT, Peter Michael RAZUKAS, Arun SAMBANDAM
  • Publication number: 20200065055
    Abstract: Embodiments are described for a method of rendering audio for playback through headphones comprising receiving digital audio content, receiving binaural rendering metadata generated by an authoring tool processing the received digital audio content, receiving playback metadata generated by a playback device, and combining the binaural rendering metadata and playback metadata to optimize playback of the digital audio content through the headphones.
    Type: Application
    Filed: November 4, 2019
    Publication date: February 27, 2020
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Nicolas R. TSINGOS, Rhonda WILSON, Sunil BHARITKAR, C. Phillip BROWN, Alan J. SEEFELDT, Remi AUDFRAY
  • Publication number: 20200021909
    Abstract: A speaker for transmitting reflected sound waves off an upper surface down to a listening environment, comprising: a cabinet containing a plurality of audio drivers, direct-firing drivers within the cabinet oriented to transmit sound along a horizontal axis substantially perpendicular to a front surface of the cabinet, and a pair of upward-firing slotted drivers placed proximate to ends of an top surface of the cabinet and oriented at an inclination angle relative to the horizontal axis. The slotted drivers are configured to create an overlapping reflected sound projection for high frequency sound when reflected down to a listening position located at a distance in front of the speaker pair. Such a speaker projects reflected sound that provides wider horizontal or side-to-side dispersion to better cover the listening area.
    Type: Application
    Filed: September 21, 2019
    Publication date: January 16, 2020
    Applicant: Dolby Laboratories Licensing Corporation
    Inventors: Michael J. SMITHERS, Alan J. SEEFELDT
  • Patent number: 10523169
    Abstract: In some embodiments, a method for processing an audio signal in an audio processing apparatus is disclosed. The method includes receiving an audio signal and a parameter, the parameter indicating a location of an auditory event boundary. An audio portion between consecutive auditory event boundaries constitutes an auditory event. The method further includes applying a modification to the audio signal based in part on an occurrence of the auditory event. The parameter may be generated by monitoring a characteristic of the audio signal and identifying a change in the characteristic.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: December 31, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Brett G. Crockett, Alan J. Seefeldt
  • Patent number: 10503461
    Abstract: Embodiments are described for a method of rendering audio for playback through headphones comprising receiving digital audio content, receiving binaural rendering metadata generated by an authoring tool processing the received digital audio content, receiving playback metadata generated by a playback device, and combining the binaural rendering metadata and playback metadata to optimize playback of the digital audio content through the headphones.
    Type: Grant
    Filed: March 13, 2019
    Date of Patent: December 10, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Nicolas R. Tsingos, Rhonda Wilson, Sunil Bharitkar, C. Phillip Brown, Alan J. Seefeldt, Remi Audfray
  • Publication number: 20190373398
    Abstract: A first playback stream presentation intended for reproduction on a first audio reproduction system and transform parameters may be received and decoded. The second playback stream presentation may be intended for reproduction on headphones. The transform parameters may be applied to an intermediate playback stream presentation to obtain the second playback stream presentation. The intermediate playback stream presentation may be the first playback stream presentation, a downmix of the first playback stream presentation, or an upmix of the first playback stream presentation. A cross-talk-cancelled signal may be obtained by processing the second playback stream presentation with a cross-talk cancellation algorithm. The cross-talk-cancelled signal may be processed by a dynamic equalization or gain stage wherein an amount of equalization or gain may be dependent on a level of the first playback stream presentation or the second playback stream presentation.
    Type: Application
    Filed: January 10, 2018
    Publication date: December 5, 2019
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Dirk Jeroen Breebaart, Alan J. Seefeldt
  • Publication number: 20190334497
    Abstract: Volume leveler controller and controlling method are disclosed. In one embodiment, A volume leveler controller includes an audio content classifier for identifying the content type of an audio signal in real time; and an adjusting unit for adjusting a volume leveler in a continuous manner based on the content type as identified. The adjusting unit may configured to positively correlate the dynamic gain of the volume leveler with informative content types of the audio signal, and negatively correlate the dynamic gain of the volume leveler with interfering content types of the audio signal.
    Type: Application
    Filed: July 12, 2019
    Publication date: October 31, 2019
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Jun WANG, Lie LU, Alan J. SEEFELDT
  • Publication number: 20190327575
    Abstract: A system and method of modifying a binaural signal using headtracking information. The system calculates a delay, a first filter response, and a second filter response, and applies these to the left and right components of the binaural signal according to the headtracking information. The system may also apply headtracking to parametric binaural signals. In this manner, headtracking may be applied to pre-rendered binaural audio.
    Type: Application
    Filed: June 20, 2017
    Publication date: October 24, 2019
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: C. Phillip Brown, Joshua Brandon Lando, Mark F. Davis, Alan J. Seefeldt, David Matthew Cooper, Dirk Jeroen Breebaart, Rhonda Wilson
  • Publication number: 20190320283
    Abstract: Embodiments are directed to upward-firing speakers that reflect sound off a ceiling to a listening location at a distance from a speaker. The reflected sound provides height cues to reproduce audio objects that have overhead audio components. A virtual height filter based on a directional hearing model is applied to the upward-firing driver signal to improve the perception of height for audio signals transmitted by the virtual height speaker to provide optimum reproduction of the overhead reflected sound. The upward firing driver is tilted at an inclination angle of approximately 20 degrees to the horizontal axis of the speaker and separate height and direct terminal connections are provided to interface to an adaptive audio rendering system.
    Type: Application
    Filed: June 25, 2019
    Publication date: October 17, 2019
    Applicant: DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Brett G. CROCKETT, Alan J. SEEFELDT, C. Phillip BROWN
  • Publication number: 20190310822
    Abstract: In an audio encoder, for audio content received in a source audio format, default gains are generated based on a default dynamic range compression (DRC) curve, and non-default gains are generated for a non-default gain profile. Based on the default gains and non-default gains, differential gains are generated. An audio signal comprising the audio content, the default DRC curve, and differential gains is generated. In an audio decoder, the default DRC curve and the differential gains are identified from the audio signal. Default gains are re-generated based on the default DRC curve. Based on the combination of the re-generated default gains and the differential gains, operations are performed on the audio content extracted from the audio signal.
    Type: Application
    Filed: April 17, 2019
    Publication date: October 10, 2019
    Inventors: Jeroen Koppens, Alexander Stahlmann, Jeffrey Riedmiller, Kristofer Kjoerling, Holger Hoerich, Alan J. Seefeldt
  • Patent number: 10425723
    Abstract: A soundbar speaker for transmitting reflected sound waves off an upper surface down to a listening environment, comprising: a cabinet containing a plurality of audio drivers, direct-firing drivers within the cabinet oriented to transmit sound along a horizontal axis substantially perpendicular to a front surface of the cabinet, and a pair of upward-firing slotted drivers placed proximate to ends of an top surface of the cabinet and oriented at an inclination angle relative to the horizontal axis. The slotted drivers are configured to create an overlapping reflected sound projection for high frequency sound when reflected down to a listening position located at a distance in front of the speaker pair. Such a speaker projects reflected sound that provides wider horizontal or side-to-side dispersion to better cover the listening area.
    Type: Grant
    Filed: August 11, 2016
    Date of Patent: September 24, 2019
    Assignee: Dolby Laboratories Licensing Corporation
    Inventors: Michael J. Smithers, Alan J. Seefeldt