Patents by Inventor Siddharth Raghunandan

Siddharth Raghunandan 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).

  • Acoustic delay measurement using adaptive filter with programmable delay buffer
    Patent number: 11238879
    Abstract: An acoustic delay measurement apparatus measures an audio delay introduced by an audio system. A programmable delay buffer, which introduces a programmable delay into the audio stream, receives an audio stream from an audio source and outputs a reference signal representing the audio stream. An adaptive filter is responsive to the reference signal to generate an estimate signal to match on convergence of the adaptive filter an audio signal output by the audio system, which is the audio stream delayed by an amount representative of the audio delay introduced by the audio system. A processor including a coefficient analysis block reads coefficients in the adaptive filter after convergence, computes a delay introduced into said estimate signal by the adaptive filter, and adds the computed delay to the programmable delay buffer to provide a measurement of the audio delay.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: February 1, 2022
    Assignee: Microsemi Semiconductor (U.S.) Inc.
    Inventors: Siddharth Raghunandan, David Colby, Dean Morgan
  • ACOUSTIC DELAY MEASUREMENT USING ADAPTIVE FILTER WITH PROGRAMMABLE DELAY BUFFER
    Publication number: 20190130929
    Abstract: An acoustic delay measurement apparatus measures an audio delay introduced by an audio system. A programmable delay buffer, which introduces a programmable delay into the audio stream, receives an audio stream from an audio source and outputs a reference signal representing the audio stream. An adaptive filter is responsive to the reference signal to generate an estimate signal to match on convergence of the adaptive filter an audio signal output by the audio system, which is the audio stream delayed by an amount representative of the audio delay introduced by the audio system. A processor including a coefficient analysis block reads coefficients in the adaptive filter after convergence, computes a delay introduced into said estimate signal by the adaptive filter, and adds the computed delay to the programmable delay buffer to provide a measurement of the audio delay.
    Type: Application
    Filed: October 31, 2018
    Publication date: May 2, 2019
    Applicant: Microsemi Semiconductor (U.S.) Inc.
    Inventors: Siddharth Raghunandan, David Colby, Dean Morgan