Patents by Inventor Jan S. Erkelens

Jan S. Erkelens 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).

  • Determining noise and sound power level differences between primary and reference channels
    Patent number: 10332541
    Abstract: A method for estimating and minimizing a noise power level difference (NPLD) between a primary channel and a reference channel of an audio device, includes receiving, by a primary channel, an audio signal that has a speech signal level and a noise signal level; receiving, by a reference channel, the audio signal with another speech signal level and another noise signal level; using the reference channel to estimate the noise signal level in the primary channel by reducing the another speech signal level; and compensating for a difference between the noise signal level and the another noise signal level to minimize a noise power level difference NPLD between the primary channel and the reference channel.
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: June 25, 2019
    Assignee: Cirrus Logic, Inc.
    Inventor: Jan S. Erkelens
  • Determining noise and sound power level differences between primary and reference channels
    Patent number: 10127919
    Abstract: A method for estimating a noise power level difference (NPLD) between a primary microphone and a reference microphone of an audio device includes obtaining primary and reference channels of an audio signal with primary and reference microphones of an audio device and estimating a noise magnitude of the reference channel of the audio signal to provide a noise variance estimate for one or more frequencies. A modelled probability density function (PDF) of a fast Fourier transform (FFT) coefficient of the primary channel of the audio signal is maximized to provide a NPLD between the noise variance estimate of the reference channel and a noise variance estimate of the primary channel. A modelled PDF of an FFT coefficient of the reference channel of the audio signal is maximized to provide a complex speech power level difference (SPLD) coefficient between the speech FFT coefficients of the primary and reference channel.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: November 13, 2018
    Assignee: Cirrus Logic, Inc.
    Inventor: Jan S. Erkelens
  • DETERMINING NOISE AND SOUND POWER LEVEL DIFFERENCES BETWEEN PRIMARY AND REFERENCE CHANNELS
    Publication number: 20180047412
    Abstract: A method for estimating and minimizing a noise power level difference (NPLD) between a primary channel and a reference channel of an audio device, includes receiving, by a primary channel, an audio signal that has a speech signal level and a noise signal level; receiving, by a reference channel, the audio signal with another speech signal level and another noise signal level; using the reference channel to estimate the noise signal level in the primary channel by reducing the another speech signal level; and compensating for a difference between the noise signal level and the another noise signal level to minimize a noise power level difference NPLD between the primary channel and the reference channel.
    Type: Application
    Filed: October 11, 2017
    Publication date: February 15, 2018
    Applicant: Cirrus Logic, Inc.
    Inventor: Jan S. Erkelens
  • DETERMINING NOISE AND SOUND POWER LEVEL DIFFERENCES BETWEEN PRIMARY AND REFERENCE CHANNELS
    Publication number: 20160134984
    Abstract: A method for estimating a noise power level difference (NPLD) between a primary microphone and a reference microphone of an audio device includes obtaining primary and reference channels of an audio signal with primary and reference microphones of an audio device and estimating a noise magnitude of the reference channel of the audio signal to provide a noise variance estimate for one or more frequencies. A modelled probability density function (PDF) of a fast Fourier transform (FFT) coefficient of the primary channel of the audio signal is maximized to provide a NPLD between the noise variance estimate of the reference channel and a noise variance estimate of the primary channel. A modelled PDF of an FFT coefficient of the reference channel of the audio signal is maximized to provide a complex speech power level difference (SPLD) coefficient between the speech FFT coefficients of the primary and reference channel.
    Type: Application
    Filed: November 11, 2015
    Publication date: May 12, 2016
    Applicant: CYPHER, LLC
    Inventor: Jan S. Erkelens