Patents by Inventor Aparna R. Gurijala

Aparna R. Gurijala 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: 10236006
    Abstract: Pre-processing modules are configured to compensate for time and pitch scaling and shifting and provide compensated audio frames to a watermark detector. Audio frames are adjusted for time stretching and shrinking and for pitch shifting. Detection metrics are evaluated to identify candidates to a watermark detector. Various schemes are also detailed for tracking modifications made to audio stems mixed into audio tracks, and for accessing a history of modifications for facilitating identification of audio stems and audio tracks comprised of stems. Various approaches address interference from audio overlays added to channels of audio after embedding. One approach applies informed embedding based on phase differences between corresponding components of the channels. A detector extracts the watermark payload effectively from either additive or subtractive combination of the channels because the informed embedding ensures that the watermark survives both types of processing.
    Type: Grant
    Filed: August 7, 2017
    Date of Patent: March 19, 2019
    Assignee: Digimarc Corporation
    Inventors: Aparna R. Gurijala, Brett A. Bradley, Ravi K. Sharma
  • Patent number: 10236031
    Abstract: A dynamic path estimation method reconstructs a program timeline in real time from an incoming stream of audio or visual content in which watermark payloads are redundantly encoded. A receiving device buffers a portion of the incoming signal, executes watermark detection on the contents of the buffer, presents detection results, and then advances the incoming signal in the buffer. Each detection result corresponds to different possible detection paths, as the detector does not reveal the precise position of the watermark payload. The dynamic path estimation method operates on the detection results to determine a global cost function for each possible detection path. As the incoming audio advances through a detection buffer, the method updates cost values for the possible paths, determines a global cost for the paths, and outputs a timeline based on the path of the lowest global cost.
    Type: Grant
    Filed: April 5, 2017
    Date of Patent: March 19, 2019
    Assignee: Digimarc Corporation
    Inventor: Aparna R. Gurijala
  • Publication number: 20180246696
    Abstract: Methods and arrangements involving electronic devices, such as smartphones, tablet computers, wearable devices, etc., are disclosed. One arrangement involves a low-power processing technique for discerning cues from audio input. Another involves a technique for detecting audio activity based on the Kullback-Liebler divergence (KLD) (or a modified version thereof) of the audio input. Still other arrangements concern techniques for managing the manner in which policies are embodied on an electronic device. Others relate to distributed computing techniques. A great variety of other features are also detailed.
    Type: Application
    Filed: February 9, 2018
    Publication date: August 30, 2018
    Inventors: Ravi K. Sharma, Shankar Thagadur Shivappa, Osama M. Alattar, Brett A. Bradley, Scott M. Long, Ajith M. Kamath, Vojtech Holub, Hugh L. Brunk, Robert G. Lyons, Aparna R. Gurijala
  • Patent number: 10043527
    Abstract: A method for generating a psychoacoustic model from an audio signal transforms a block of samples of an audio signal into a frequency spectrum comprising frequency components. From this frequency spectrum, it derives group masking energies. These group masking energies each correspond to a group of neighboring frequency components in the frequency spectrum. For a group of frequency components, the method allocates the group masking energy to the frequency components in the group in proportion to energy of the frequency components within the group to provide adapted mask energies for the frequency components within the group, the adapted mask energies providing masking thresholds for the psychoacoustic model of the audio signal.
    Type: Grant
    Filed: July 18, 2016
    Date of Patent: August 7, 2018
    Assignee: Digimarc Corporation
    Inventors: Aparna R. Gurijala, Shankar Thagadur Shivappa, Ravi K. Sharma, Brett A. Bradley
  • Patent number: 10026410
    Abstract: Audio signal processing enhances audio watermark embedding and detecting processes. Audio signal processes include audio classification and adapting watermark embedding and detecting based on classification. Advances in audio watermark design include adaptive watermark signal structure data protocols, perceptual models, and insertion methods. Perceptual and robustness evaluation is integrated into audio watermark embedding to optimize audio quality relative the original signal, and to optimize robustness or data capacity. These methods are applied to audio segments in audio embedder and detector configurations to support real time operation. Feature extraction and matching are also used to adapt audio watermark embedding and detecting.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: July 17, 2018
    Assignee: Digimarc Corporation
    Inventors: Aparna R. Gurijala, Yang Bai, Ravi K. Sharma, Brett A. Bradley
  • Patent number: 9891883
    Abstract: Methods and arrangements involving electronic devices, such as smartphones, tablet computers, wearable devices, etc., are disclosed. One arrangement involves a low-power processing technique for discerning cues from audio input. Another involves a technique for detecting audio activity based on the Kullback-Liebler divergence (KLD) (or a modified version thereof) of the audio input. Still other arrangements concern techniques for managing the manner in which policies are embodied on an electronic device. Others relate to distributed computing techniques. A great variety of other features are also detailed.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: February 13, 2018
    Assignee: Digimarc Corporation
    Inventors: Ravi K. Sharma, Shankar Thagadur Shivappa, Osama M. Alattar, Brett A. Bradley, Scott M. Long, Ajith M. Kamath, Vojtech Holub, Hugh L. Brunk, Robert G. Lyons, Aparna R. Gurijala
  • Patent number: 9697578
    Abstract: The present disclosure relates generally to cell phones and cameras, and to digital watermarking involving such cell phones and cameras. One claim recites a method comprising: measuring distortion introduced by a cell phone camera; using a programmed electronic processor, quantifying the distortion; and providing quantified distortion as feedback to adjust a digital watermark embedding process in view of the distortion introduced by the cell phone camera. The act of quantifying distortion may include, e.g., quantifying a spatial frequency response (SFR) of the cell phone camera. Of course, other claims and combinations are provided too.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: July 4, 2017
    Assignee: Digimarc Corporation
    Inventors: Aparna R. Gurijala, Alastair M. Reed
  • Publication number: 20170133022
    Abstract: Audio signal processing enhances audio watermark embedding and detecting processes. Audio signal processes include audio classification and adapting watermark embedding and detecting based on classification. Advances in audio watermark design include adaptive watermark signal structure data protocols, perceptual models, and insertion methods. Perceptual and robustness evaluation is integrated into audio watermark embedding to optimize audio quality relative the original signal, and to optimize robustness or data capacity. These methods are applied to audio segments in audio embedder and detector configurations to support real time operation. Feature extraction and matching are also used to adapt audio watermark embedding and detecting.
    Type: Application
    Filed: July 26, 2016
    Publication date: May 11, 2017
    Inventors: Aparna R. Gurijala, Yang Bai, Ravi K. Sharma, Brett A. Bradley
  • Publication number: 20160378427
    Abstract: Methods and arrangements involving electronic devices, such as smartphones, tablet computers, wearable devices, etc., are disclosed. One arrangement involves a low-power processing technique for discerning cues from audio input. Another involves a technique for detecting audio activity based on the Kullback-Liebler divergence (KLD) (or a modified version thereof) of the audio input. Still other arrangements concern techniques for managing the manner in which policies are embodied on an electronic device. Others relate to distributed computing techniques. A great variety of other features are also detailed.
    Type: Application
    Filed: June 24, 2016
    Publication date: December 29, 2016
    Inventors: Ravi K. Sharma, Shankar Thagadur Shivappa, Osama M. Alattar, Brett A. Bradley, Scott M. Long, Ajith M. Kamath, Vojtech Holub, Hugh L. Brunk, Robert G. Lyons, Aparna R. Gurijala