Patents by Inventor Jeffrey D. Alderson

Jeffrey D. Alderson 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: 20210225352
    Abstract: An integrated circuit for implementing at least a portion of a personal audio device may include an output for providing an output signal to a transducer, wherein the output signal includes a pilot signal, a microphone input for receiving a microphone signal from a microphone indicative of an output of the transducer, and a processing circuit. The processing circuit may be configured to implement a pilot signal control to apply an adjustment to the pilot signal as necessary to maintain the pilot signal at a substantially constant magnitude regardless of proximity of the transducer to a pinna and implement a proximity determination block configured to determine proximity of the transducer to the pinna based on the adjustment.
    Type: Application
    Filed: January 7, 2021
    Publication date: July 22, 2021
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Viral PARIKH, Jon D. HENDRIX, Jeffrey D. ALDERSON, Vitaliy SAPOZHNYKOV, Nafiseh Erfanian SAEEDI, Thomas I. HARVEY, Robert LUKE
  • Publication number: 20210125469
    Abstract: A system may include an electromagnetic load capable of generating a haptic event and a haptic processor configured to receive at least one first parameter indicative of a desired perception of the haptic event to a user of a device comprising the electromagnetic load, receive at least one second parameter indicative of one or more characteristics of the device, and process the at least one first parameter and the at least one second parameter to generate a driving signal to the electromagnetic load in order to produce the desired perception to the user despite variances in the device that cause an actual perception of the haptic event to vary from the desired perception.
    Type: Application
    Filed: September 30, 2020
    Publication date: April 29, 2021
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Jeffrey D. ALDERSON, John L. MELANSON, Anthony S. DOY, Eric LINDEMANN
  • Patent number: 10923097
    Abstract: An integrated circuit for implementing at least a portion of a personal audio device may include an output for providing an output signal to a transducer, wherein the output signal includes a pilot signal, a microphone input for receiving a microphone signal from a microphone indicative of an output of the transducer, and a processing circuit. The processing circuit may be configured to implement a pilot signal control to apply an adjustment to the pilot signal as necessary to maintain the pilot signal at a substantially constant magnitude regardless of proximity of the transducer to a pinna and implement a proximity determination block configured to determine proximity of the transducer to the pinna based on the adjustment.
    Type: Grant
    Filed: August 13, 2019
    Date of Patent: February 16, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: Viral Parikh, Jon D. Hendrix, Jeffrey D. Alderson, Vitaliy Sapozhnykov, Nafiseh Erfanian Saeedi, Thomas I. Harvey, Robert Luke
  • Publication number: 20200058285
    Abstract: An integrated circuit for implementing at least a portion of a personal audio device may include an output for providing an output signal to a transducer, wherein the output signal includes a pilot signal, a microphone input for receiving a microphone signal from a microphone indicative of an output of the transducer, and a processing circuit. The processing circuit may be configured to implement a pilot signal control to apply an adjustment to the pilot signal as necessary to maintain the pilot signal at a substantially constant magnitude regardless of proximity of the transducer to a pinna and implement a proximity determination block configured to determine proximity of the transducer to the pinna based on the adjustment.
    Type: Application
    Filed: August 13, 2019
    Publication date: February 20, 2020
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Viral PARIKH, Jon D. HENDRIX, Jeffrey D. ALDERSON, Vitaliy SAPOZHNYKOV, Nafiseh ERFANIAN SAEEDI, Thomas I. HARVEY, Robert LUKE
  • Patent number: 10382864
    Abstract: In accordance with systems and methods of the present disclosure, a method may include receiving an error microphone signal indicative of an acoustic output of a transducer and ambient audio sounds at the acoustic output of the transducer. The method may also include generating an anti-noise signal to reduce the presence of the ambient audio sounds at the acoustic output of the transducer based at least on the error microphone signal. The method may further include generating an equalized source audio signal from a source audio signal by adapting, based at least on the error microphone signal, a response of the adaptive playback equalization system to minimize a difference between the source audio signal and the error microphone signal. The method may additionally include combining the anti-noise signal with the equalized source audio signal to generate an audio signal provided to the transducer.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: August 13, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: Jeffrey D. Alderson, Jon D. Hendrix
  • Patent number: 10290296
    Abstract: An integrated circuit may include an output for providing an output signal to a transducer including both a source audio signal for playback to a listener and an anti-noise signal for countering the effect of ambient audio sounds in an acoustic output of the transducer, an ambient microphone input for receiving an ambient microphone signal indicative of the ambient audio sounds; an error microphone input for receiving an error microphone signal indicative of the output of the transducer and the ambient audio sounds at the transducer; and a processing circuit that implements a feedback path having a feedback response that generates a feedback anti-noise signal from the error microphone signal, wherein a signal gain of the feedback path is a function of the ambient microphone signal, and wherein the anti-noise signal comprises at least the feedback anti-noise signal.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: May 14, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: Jon D. Hendrix, Jeffrey D. Alderson, Chin Huang Yong, Ryan A. Hellman
  • Patent number: 10249283
    Abstract: The handling of disturbances to audio signals may be improved with an adaptive noise cancellation (ANC) system that performs tone suppression and howl suppression in a collaborative manner. Such ANC systems may be configured to detect a first tone in an input signal at a first tone frequency and extract the detected first tone from the input signal. The ANC systems may also be configured to adaptively filter the extracted first tone to generate a second tone that has a magnitude that is approximately equal to a magnitude of the extracted first tone and a phase that is approximately opposite the phase of the extracted first tone. The ANC systems may be further configured to add the second tone to an intermediate signal that is based, at least in part, on the input signal to generate the output signal.
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: April 2, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: Dayong Zhou, Yang Lu, Jeffrey D. Alderson, Eric King
  • Patent number: 10219071
    Abstract: A method may include adaptively generating an anti-noise signal from filtering a reference microphone signal with an adaptive filter in conformity with an error microphone signal and the reference microphone signal. The method may also include adjusting the response of the adaptive filter by combining injected noise with the reference microphone signal and receiving the injected noise by a copy of the adaptive filter so that the response of the copy is controlled by the adaptive filter adapting to cancel a combination of the ambient audio sounds and the injected noise and controlling the response of the adaptive filter with the coefficients adapted in the copy, whereby the injected noise is not present in the anti-noise signal and wherein each of a sample rate of the copy and a rate of adapting of the adaptive filter is significantly less than a sample rate of the adaptive filter.
    Type: Grant
    Filed: December 10, 2013
    Date of Patent: February 26, 2019
    Assignee: Cirrus Logic, Inc.
    Inventor: Jeffrey D. Alderson
  • Patent number: 10206032
    Abstract: In accordance with the present disclosure, an integrated circuit for implementing at least a portion of a personal audio device may include an output and a processing circuit. The output may provide an output signal to a transducer including both a source audio signal for playback to a listener and an anti-noise signal for countering the effect of ambient audio sounds in an acoustic output of the transducer. The processing circuit may implement an adaptive noise cancellation system that generates the anti-noise signal to reduce the presence of the ambient audio sounds heard by the listener by adapting, based on a presence of the source audio signal, a response of the adaptive noise cancellation system to minimize the ambient audio sounds at the acoustic output of the transducer, wherein the adaptive noise cancellation system is configured to adapt both in the presence and the absence of the source audio signal.
    Type: Grant
    Filed: August 8, 2013
    Date of Patent: February 12, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: Jeffrey D. Alderson, Jon D. Hendrix, Antonio J. Miller, Robert G. Kratsas, Jens-Peter B. Axelsson, Dayong Zhou, Yang Lu, Chin Huang Yong
  • Publication number: 20190043467
    Abstract: The handling of disturbances to audio signals may be improved with an adaptive noise cancellation (ANC) system that performs tone suppression and howl suppression in a collaborative manner. Such ANC systems may be configured to detect a first tone in an input signal at a first tone frequency and extract the detected first tone from the input signal. The ANC systems may also be configured to adaptively filter the extracted first tone to generate a second tone that has a magnitude that is approximately equal to a magnitude of the extracted first tone and a phase that is approximately opposite the phase of the extracted first tone. The ANC systems may be further configured to add the second tone to an intermediate signal that is based, at least in part, on the input signal to generate the output signal.
    Type: Application
    Filed: August 4, 2017
    Publication date: February 7, 2019
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Dayong Zhou, Yang Lu, Jeffrey D. Alderson, Eric King
  • Patent number: 10181315
    Abstract: In accordance with the present disclosure, an adaptive noise cancellation system may include a controller. The controller may be configured to determine a degree of convergence of an adaptive coefficient control block for controlling an adaptive response of the adaptive noise cancellation system. The controller may enable adaptation of the adaptive coefficient control block if the degree of convergence of the adaptive response is below a particular threshold and disable adaptation of the adaptive coefficient control block if the degree of convergence of the adaptive response is above a particular threshold, such that when the adaptive noise cancellation system is adequately converged, the adaptive noise cancellation system may conserve power by disabling one or more of its components.
    Type: Grant
    Filed: June 13, 2014
    Date of Patent: January 15, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: Jeffrey D. Alderson, Jon D. Hendrix, Dayong Zhou
  • Patent number: 10152960
    Abstract: An integrated circuit may include an output for providing a signal to a transducer including both source audio for playback to a listener and an anti-noise signal for countering the effects of ambient audio sounds in an acoustic output of the transducer, a microphone input for receiving a microphone signal indicative of ambient sounds at the transducer, a link control input for receiving link control information of a communications link coupling the integrated circuit to the transducer and/or a microphone for generating the microphone signal, wherein the link control information includes a link quality metric of the communications link, and a processing circuit comprising a filter having a response that generates the anti-noise signal in conformity with the microphone signal to minimize the ambient sounds at the acoustic output of the transducer, wherein the processing circuit modifies generation of the anti-noise signal responsive to the link quality metric.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: December 11, 2018
    Assignee: Cirrus Logic, Inc.
    Inventors: Jon D. Hendrix, Nitin Kwatra, Jeffrey D. Alderson
  • Patent number: 9812114
    Abstract: A method may include adaptively generating an anti-noise signal for countering the effects of ambient audio sounds at an acoustic output of the transducer by adapting a response of an adaptive filter that filters a reference microphone signal in conformity with an error microphone signal and the reference microphone signal to minimize the ambient audio sounds in the error microphone, generating a scaled anti-noise signal by applying a scaling factor to the anti-noise signal, further adjusting the response of the adaptive filter independent of a source audio signal by altering an input to the coefficient control block of the adaptive filter to compensate for the scaling factor, and combining the scaled anti-noise signal with the source audio signal to generate an audio signal provided to the transducer.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: November 7, 2017
    Assignee: Cirrus Logic, Inc.
    Inventors: Jeffrey D. Alderson, Jon D. Hendrix, Sang-Ik Terry Cho, Chin Huang Yong, John L. Melanson
  • Publication number: 20170256248
    Abstract: A method may include adaptively generating an anti-noise signal for countering the effects of ambient audio sounds at an acoustic output of the transducer by adapting a response of an adaptive filter that filters a reference microphone signal in conformity with an error microphone signal and the reference microphone signal to minimize the ambient audio sounds in the error microphone, generating a scaled anti-noise signal by applying a scaling factor to the anti-noise signal, further adjusting the response of the adaptive filter independent of a source audio signal by altering an input to the coefficient control block of the adaptive filter to compensate for the scaling factor, and combining the scaled anti-noise signal with the source audio signal to generate an audio signal provided to the transducer.
    Type: Application
    Filed: March 2, 2016
    Publication date: September 7, 2017
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Jeffrey D. Alderson, Jon D. Hendrix, Sang-Ik Terry Cho, Chin Huang Yong, John L. Melanson
  • Patent number: 9740428
    Abstract: Accessing a circular buffer in memory from a processor may be performed with the aid of precomputed values stored in a pointer descriptor field of a processor storage element, such as a register. The pointer descriptor may store a precomputed value for calculating a memory address in the circular buffer, which may include two values, in which the two values are based, at least in part, on the size of the circular buffer, but neither be the size of the circular buffer. The first value may be used to derive a starting memory location for a circular buffer. The second value may be used in combination with the first value to calculate an end memory location. The start and end locations or addresses, along with the precomputed stored values, are then used to calculate the next address based on the current address of a circular buffer in an efficient manner.
    Type: Grant
    Filed: May 5, 2016
    Date of Patent: August 22, 2017
    Assignee: CIRRUS LOGIC, INC.
    Inventors: Bryant E. Sorensen, Anthony James Magrath, Jeffrey D. Alderson
  • Publication number: 20170133000
    Abstract: An integrated circuit may include an output for providing an output signal to a transducer including both a source audio signal for playback to a listener and an anti-noise signal for countering the effect of ambient audio sounds in an acoustic output of the transducer, an ambient microphone input for receiving an ambient microphone signal indicative of the ambient audio sounds; an error microphone input for receiving an error microphone signal indicative of the output of the transducer and the ambient audio sounds at the transducer; and a processing circuit that implements a feedback path having a feedback response that generates a feedback anti-noise signal from the error microphone signal, wherein a signal gain of the feedback path is a function of the ambient microphone signal, and wherein the anti-noise signal comprises at least the feedback anti-noise signal.
    Type: Application
    Filed: October 28, 2016
    Publication date: May 11, 2017
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Jon D. HENDRIX, Jeffrey D. ALDERSON, Chin Huang YONG, Ryan A. HELLMAN
  • Patent number: 9620101
    Abstract: An audio amplifier circuit may include a power amplifier, a charge pump power supply, and a control circuit. The power amplifier may have an audio input for receiving an audio input signal, an audio output for providing the output signal, and a power supply input. The charge pump power supply may provide a power supply voltage to the power supply input. The charge pump power supply may have a select input for selecting an operating mode of the power supply. In a first operating mode, the power supply voltage may equal to a first voltage, and in a second operating mode, the power supply voltage may be substantially equal to a second voltage which is a rational fraction of the first voltage. The control circuit may generate the select input based on a magnitude of anti-noise generated by an adaptive noise cancellation system associated with the audio transducer.
    Type: Grant
    Filed: October 8, 2013
    Date of Patent: April 11, 2017
    Assignee: Cirrus Logic, Inc.
    Inventors: Bharath Kumar Thandri, Aniruddha Satoskar, Jeffrey D. Alderson, John L. Melanson
  • Publication number: 20170084263
    Abstract: An integrated circuit may include an output for providing a signal to a transducer including both source audio for playback to a listener and an anti-noise signal for countering the effects of ambient audio sounds in an acoustic output of the transducer, a microphone input for receiving a microphone signal indicative of ambient sounds at the transducer, a link control input for receiving link control information of a communications link coupling the integrated circuit to the transducer and/or a microphone for generating the microphone signal, wherein the link control information includes a link quality metric of the communications link, and a processing circuit comprising a filter having a response that generates the anti-noise signal in conformity with the microphone signal to minimize the ambient sounds at the acoustic output of the transducer, wherein the processing circuit modifies generation of the anti-noise signal responsive to the link quality metric.
    Type: Application
    Filed: February 25, 2016
    Publication date: March 23, 2017
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Jon D. Hendrix, Nitin Kwatra, Jeffrey D. Alderson
  • Publication number: 20160365084
    Abstract: In accordance with embodiments of the present disclosure, a hybrid finite impulse response filter having a plurality of delay stages comprising a first filter portion and a second filter portion. In some embodiments, the first filter portion may be a high-rate filter portion associated with a first portion of the plurality of delay stages and configured to filter an input signal having a first sampling rate to generate a first intermediate output signal and the second portion may be a low-rate filter portion associated with a second portion of the plurality of delay stages and configured to filter a downsampled version of the input signal at a second sampling rate to generate a second intermediate output signal.
    Type: Application
    Filed: June 9, 2015
    Publication date: December 15, 2016
    Inventors: Jeffrey D. Alderson, John L. Melanson, Nitin Kwatra, Ryan A. Hellman
  • Patent number: 9460701
    Abstract: A processing circuit may comprise an adaptive filter having a response generating an anti-noise signal from a reference microphone signal, a secondary path estimate filter modeling an electro-acoustic path of a source audio signal, a biasing portion that generates a scaled anti-noise signal by applying a scaling factor and the response of the secondary path estimate filter to the anti-noise signal, and a coefficient control block that shapes the response of the adaptive filter in conformity with the reference microphone signal and a modified playback corrected error signal by adapting the response of the adaptive filter to minimize ambient audio sounds in the error microphone signal, wherein the playback corrected error is based on a difference between the error microphone signal and the source audio signal and the modified playback corrected error signal is based on a difference between the playback corrected error signal and the scaled anti-noise signal.
    Type: Grant
    Filed: July 16, 2013
    Date of Patent: October 4, 2016
    Assignee: Cirrus Logic, Inc.
    Inventors: Chin Huang Yong, Jeffrey D. Alderson