Patents Assigned to Cirrus Logic, Inc.
  • Communication apparatus with ambient noise reduction
    Patent number: 10950215
    Abstract: Noise reduction circuitry for a communication apparatus can apply different noise reduction transfer functions, depending on whether a listening device is connected to the apparatus. If no listening device is connected, the noise reduction transfer function can be adapted for use with microphones and speakers that form an integral part of the communication apparatus, which may be a cellular telephone. If a listening device is connected, the noise reduction transfer function can be adapted for use with microphones and speakers that form a part of the listening device. This allows the noise reduction circuitry to provide improved noise reduction performance.
    Type: Grant
    Filed: June 10, 2020
    Date of Patent: March 16, 2021
    Assignee: Cirrus Logic, Inc.
    Inventor: Alastair Sibbald
  • Dynamic on ear headset detection
    Patent number: 10951972
    Abstract: A method and device for detecting whether a headset is on ear. Microphone signals from a plurality of microphones are used to derive a plurality of signal feature measures, which are normalized to a common reference scale. The signal feature measures are weighted based upon detected signal conditions in the microphone signals. The normalized and variably weighted signal feature measures are then combined to produce an output indication of whether a headset is on ear.
    Type: Grant
    Filed: February 28, 2019
    Date of Patent: March 16, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: Vitaliy Sapozhnykov, Thomas Ivan Harvey, Nafiseh Erfaniansaeedi, Robert Luke
  • Generating prompts for user vocalisation for biometric speaker recognition
    Patent number: 10950245
    Abstract: This application describes methods and apparatus for generating a prompt to be presented to a user for the user to vocalise as part of speaker recognition. An apparatus according to an embodiment has a selector for selecting at least one vocal prompt element to form at least part of said prompt from a predetermined set of a plurality of vocal prompt elements. The selector is configured to select the vocal prompt element based, at least partly, on an indication of the operating conditions for the biometric speaker recognition, for example background noise. The prompt is selected to be one which will provide a good likelihood of discrimination between users when vocalised and used for speaker recognition in the current operating conditions. The prompt may be issued as part of a verification process for an existing user or an enrolment process for an enrolling user.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: March 16, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: John Laurence Melanson, John Paul Lesso
  • Successive approximation register analog-to-digital converter with multiple sample capacitors
    Patent number: 10951225
    Abstract: A SAR ADC may include a plurality of capacitor networks, wherein each capacitor network of the plurality of capacitor networks has a sampling capacitor for sampling an analog input signal to the SAR ADC and at least one non-sampling capacitor. The SAR ADC may also include a DAC including a plurality of sub-DACs including at least a first sub-DAC representing most significant bits of an output of the SAR ADC, wherein the output of the first sub-DAC is coupled to the sampling capacitors of the plurality of capacitor networks and a second sub-DAC representing bits of the output of the SAR ADC lesser in magnitude significance than those of the first sub-DAC, wherein the output of the second sub-DAC is coupled to a respective one of at least one non-sampling capacitor of each of the plurality of capacitor networks.
    Type: Grant
    Filed: March 17, 2020
    Date of Patent: March 16, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: Donelson A. Shannon, Edmund M. Schneider, Jianping Wen
  • Fluency aid
    Patent number: 10945876
    Abstract: The present disclosure provides a fluency aid comprising: a masking signal generator; a switch operable to switch the masking signal generator between an ON state and an OFF state, wherein, when in the ON state, the masking signal generator is operable to generate a masking signal; a sound generator operable to receive the masking signal from the masking signal generator and generate a masking sound for output to a user of the fluency aid; and a voice detector operable to detect a voice of the user, wherein the masking signal generator is operable to generate the masking signal at least until the voice of the user is detected by the voice detector.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: March 16, 2021
    Assignee: Cirrus Logic, Inc.
    Inventor: Tahir Rashid
  • False triggering prevention in a resonant phase sensing system
    Patent number: 10942610
    Abstract: A system may include a resistive-inductive-capacitive sensor, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to at a plurality of periodic intervals, measure phase information associated with the resistive-inductive-capacitive sensor and based on the phase information, determine a displacement of a mechanical member relative to the resistive-inductive-capacitive sensor. The system may also include a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency and a driving amplitude, wherein at least one of the driving frequency and the driving amplitude varies among the plurality of periodic intervals.
    Type: Grant
    Filed: March 26, 2020
    Date of Patent: March 9, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: Siddharth Maru, Tejasvi Das, Luke Lapointe, Srdjan Marijanovic, Zhong You, Drew Kinney, Anthony S. Doy, Eric J. King
  • Loudspeaker driver systems
    Patent number: 10945069
    Abstract: A system for driving a loudspeaker having a plurality of coils, the system comprising: a modulator configured to receive an input signal and to output a pulse width modulated (PWM) output signal representative of the received input signal; a delay element for receiving and applying a delay to the PWM output signal to generate a first delayed signal; a first output configured to be coupled to a first coil of the plurality of coils of the loudspeaker, wherein the first output is coupled to the output of the modulator; and a second output configured to be coupled to a second coil of the plurality of coils of the loudspeaker, wherein the second output is coupled to the output of the delay.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: March 9, 2021
    Assignee: Cirrus Logic, Inc.
    Inventor: John P. Lesso
  • Low-latency compensating audio filters using negative group delay
    Patent number: 10945074
    Abstract: A system may include an input configured to receive an audio signal, a filter having a negative group delay within a range of frequencies which are human-audible, the filter configured to receive the audio signal and filter the audio signal to generate a filtered audio signal, and a modulator configured to receive the filtered audio signal and modulate the filtered audio signal to generate a modulated filtered audio signal for communication over a digital interface.
    Type: Grant
    Filed: July 25, 2019
    Date of Patent: March 9, 2021
    Assignee: Cirrus Logic, Inc.
    Inventor: John L. Melanson
  • Temperature monitoring
    Patent number: 10935439
    Abstract: This application relates to methods and apparatus for temperature monitoring for integrated circuits, and in particular to temperature monitoring using a locked-loop circuits, e.g. FLLs, PLLs or DLLs. According to embodiments a locked-loop circuit (200, 600) includes a controlled signal timing module (201, 601), wherein the timing properties of an output signal (SOUT, SFB) are dependent on a value of a control signal and on temperature. A controller (201, 601) compares a feedback signal (SFB) output from the timing module to a reference signal (SREF) and generates a control signal (SC) to maintain a desired timing relationship. A temperature monitor (202) monitors temperature based on the value of the control signal. For FLLs and PLLs the signal timing module may be a controlled oscillator (201).
    Type: Grant
    Filed: August 20, 2018
    Date of Patent: March 2, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: John Paul Lesso, Gordon James Bates
  • On-chip resonance detection and transfer function mapping of resistive-inductive-capacitive sensors
    Patent number: 10935620
    Abstract: A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor with a driving signal at a driving frequency, and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to, during a calibration phase of the measurement circuit, measure phase and amplitude information associated with the resistive-inductive-capacitive sensor and based on the phase and amplitude information, determine at least one of a resonant frequency of the resistive-inductive-capacitive sensor and a transfer function of the resistive-inductive-capacitive sensor.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: March 2, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: Tejasvi Das, Siddharth Maru, Matthew Beardsworth, Bruce E. Duewer, Michael A. Kost
  • Use of reference sensor in resonant phase sensing system
    Patent number: 10921159
    Abstract: A system may include a first resistive-inductive-capacitive sensor, a second resistive-inductive-capacitive sensor, and a measurement circuit communicatively coupled to the first resistive-inductive-capacitive sensor and the second resistive-inductive-capacitive sensor and configured to measure first phase information associated with the first resistive-inductive-capacitive sensor, measure second phase information associated with the second resistive-inductive-capacitive sensor, and based on the first phase information and the second phase information, determine a displacement of a mechanical member relative to the first resistive-inductive-capacitive sensor.
    Type: Grant
    Filed: March 12, 2019
    Date of Patent: February 16, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: Tejasvi Das, Zhong You, Siddharth Maru, Eric J. King, Johann G. Gaboriau, Luke Lapointe, Matthew Beardsworth
  • Speech recognition
    Patent number: 10923128
    Abstract: A method of performing speech recognition, comprises, at a first device: receiving an audio signal representing speech; performing a first data integrity check operation on the received audio signal; performing a speaker recognition process on the received audio signal; forwarding the received audio signal to a second device, wherein the second device comprises a speech recognition function; and forwarding an output of the first data integrity check operation to the second device.
    Type: Grant
    Filed: August 29, 2018
    Date of Patent: February 16, 2021
    Assignee: Cirrus Logic, Inc.
    Inventor: John Paul Lesso
  • Pinna proximity detection
    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
  • Dual device semiconductor structures with shared drain
    Patent number: 10917052
    Abstract: Transistors may be manufactured with a shared drain to reduce die area consumed by circuitry. In one example, two transistors can be manufactured that include two body regions that abut a shared drain region. The two transistors can be independently operated by coupling terminals to a source and a gate for each transistor and the shared drain. Characteristics of the two transistors can be controlled by adjusting feature sizes, such as overlap between the gate and the shared drain for a transistor. In particular, two transistors with different voltage requirements can be manufactured using a shared drain structure, which can be useful in amplifier circuitry and in particular Class-D amplifiers.
    Type: Grant
    Filed: April 5, 2019
    Date of Patent: February 9, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: Shanjen Pan, Marc L. Tarabbia, Christian Larsen
  • Amplifiers
    Patent number: 10917053
    Abstract: This application relates to amplifier circuits for amplifying an audio signal. An amplifier circuit (100) has a voltage regulator (201) for outputting a supply voltage to an amplifier (104). An output capacitor (103) coupled to an output node of the voltage regulator. The voltage regulator is operable in a voltage-control mode to maintain the output voltage (VS) at a nominal output voltage and in current-control mode to limit the input current drawn to exceed a defined limit. A controller (301) is operable in a first mode to define the nominal output voltage so as not to exceed a first voltage magnitude and in a second mode to define the nominal output voltage to be equal to a second, higher, voltage magnitude.
    Type: Grant
    Filed: January 14, 2020
    Date of Patent: February 9, 2021
    Assignee: Cirrus Logic, Inc.
    Inventor: Terence Orr
  • Apparatus for and method of wind detection
    Patent number: 10917716
    Abstract: A method, comprising: obtain one or more accelerometer signals derived from an accelerometer; and determining one or more parameters of wind at the accelerometer based on the one or more accelerometer signals.
    Type: Grant
    Filed: June 19, 2019
    Date of Patent: February 9, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: Vitaliy Sapozhnykov, Thomas I. Harvey, Hock Lim, David Watts
  • Augmented multi-stage boost converter
    Patent number: 10917013
    Abstract: A boost converter may include a first stage comprising a first dual anti-wound inductor constructed such that its windings generate opposing magnetic fields in its magnetic core, and a second stage comprising a second dual anti-wound inductor constructed such that its windings generate opposing magnetic fields in its magnetic core. The boost converter may also include control circuitry for controlling the first stage and the second stage to have a plurality of phases comprising a first phase wherein a first coil of the first dual anti-wound inductor and a second coil of the second dual anti-wound inductor are coupled in parallel between a power supply and a ground voltage and a second phase wherein the first coil of the first dual anti-wound inductor and the second coil of the second dual anti-wound inductor are coupled in series between the power supply and the ground voltage.
    Type: Grant
    Filed: November 22, 2019
    Date of Patent: February 9, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: John L. Melanson, Eric J. King, Jason W. Lawrence
  • Biometric authentication
    Patent number: 10915614
    Abstract: A method for authenticating a user of an electronic device is disclosed. The method comprises: responsive to detection of a trigger event indicative of a user interaction with the electronic device, generating an audio probe signal to play through an audio transducer of the electronic device; receiving a first audio signal comprising a response of the user's ear to the audio probe signal; receiving a second audio signal comprising speech of the user; and applying an ear biometric algorithm to the first audio signal and a voice biometric algorithm to the second audio signal to authenticate the user as an authorised user.
    Type: Grant
    Filed: August 31, 2018
    Date of Patent: February 9, 2021
    Assignee: Cirrus Logic, Inc.
    Inventor: John Paul Lesso
  • Resonant phase sensing of resistive-inductive-capacitive sensors
    Patent number: 10908200
    Abstract: A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency, and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to measure phase information associated with the resistive-inductive-capacitive sensor and based on the phase information, determine a displacement of a mechanical member relative to the resistive-inductive-capacitive sensor, wherein the displacement of the mechanical member causes a change in an impedance of the resistive-inductive-capacitive sensor.
    Type: Grant
    Filed: February 4, 2019
    Date of Patent: February 2, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: Zhong You, Siddharth Maru, Tejasvi Das, Luke Lapointe, Eric J. King, Anthony S. Doy, Srdjan Marjianovic, Drew Kinney, Matthew Beardsworth, Emmanuel Marchais
  • Calibration of current sense amplifier with common-mode rejection
    Patent number: 10901012
    Abstract: A method for calculating a calibration gain used for common-mode rejection in a current sensing system may include measuring a first value of a common-mode voltage associated with the current sensing system and a first output value of the current sensing system occurring at the first value of the common-mode voltage, measuring a second value of the common-mode voltage associated with the current sensing system and a second output value of the current sensing system occurring at the second value of the common-mode voltage, and based on a difference between the second output value of the current sensing system and the first output value of the current sensing system and a difference between the second value of the common-mode voltage and the first value of the common-mode voltage, calculating the calibration gain.
    Type: Grant
    Filed: March 15, 2019
    Date of Patent: January 26, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: Katy Holland, Vamsikrishna Parupalli, Christian Larsen, Graeme Mackay