Cirrus Logic Inc.

Bruce Eliot Duewer

Tejasvi Das

Matthew Beardsworth

John L Melanson

Siddharth Maru

Dylan Alexander Hester

Shafagh Kamkar

Michael Allan Kost

Michael Allen Kost

Pablo Peso Parada

Hamid Sepehr

Willem Zwart

Tom Birchall

Anthony Stephen Doy

Kartik Nanda

Marc John Kobayashi

Brian David Trotter

Xin Zhao

Stephen Timothy Hodapp

Bradley Allan Lambert

Richard Dean Putman

Pradeep Dhananjay

David Hisky

Gautham Devendra Kamath

Timothy Thomas Rueger

Mohammad Ranjbar

Bhupendra Singh Manola

Lei Ding

Jason Lee Wardlaw

Tom Gong Lei

Xaiofan Fei

Vitaliy Kulikov

Jason Matocha

Jason L Wardlaw

Brad Allan Lambert

A system may include an array of sensor elements, the array of sensor elements each comprising a first type of passive reactive element, a second type of passive reactive element electrically coupled to the array of sensor elements, a driver configured to drive the array of sensor elements and the second type of passive reactive element, and control circuitry configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.

Single-capacitor inductive sense systems

A force sensing system for determining if a user input has occurred, the system comprising: an input channel, to receive an input from at least one force sensor; an activity detection stage, to monitor an activity level of the input from the at least one force sensor and, responsive to an activity level which may be indicative of a user input being reached, to generate an indication that an activity has occurred at the force sensor; and an event detection stage to receive said indication, and to determine if a user input has occurred based on the received input from the at least one force sensor.

Force sensing system and method

A system may include at least one resistive-inductive-capacitive sensor and a control circuit configured to maintain timing parameters for operation of the at least one resistive-inductive-capacitive sensor and vary at least one of the timing parameters to control a spectrum associated with the at least one resistive-inductive-capacitive sensor, wherein the spectrum comprises one of a sensor activity spectrum of the at least one resistive-inductive-capacitive sensor and a current usage spectrum associated with electrical current delivered to the at least one resistive-inductive-capacitive sensor from a source of electrical energy.

Spread spectrum sensor scanning using resistive-inductive-capacitive sensors

A system may include an audio coder-decoder (codec) having a plurality of digital-to-analog converters (DACs) and a plurality of analog-to-digital converters (ADCs), a serial interface communicatively coupled to the audio codec wherein the serial interface is configured to communicate audio streams to or from the audio codec, wherein the audio codec is configured to be configured as a device on the serial interface, and logic configured to control performance of a communication path within the audio codec based on one or more system conditions associated with the system.

Variable performance codec

A single-bit audio stream can be converted to a modified single-bit audio stream with a constant edge rate while maintaining a modulation index of the original audio stream using direct mapping. With direct mapping, a pre-filter bank may be combined with a multi-bit symbol mapper to select symbols for the modified audio stream with a constant edge rate per symbol and the same modulation index as the original audio stream. The output of the pre-filter bank may be an audio stream with no consecutive full-scale symbols. Using the output of the pre-filter bank, a multi-bit symbol mapper may use the symbol selector to output a symbol with a constant edge rate per symbol and the same modulation index as the original signal. The symbols may be converted to an analog signal for reproduction of audio content using a transducer.

Direct mapping

A system may include a plurality of actively-driven inductive sensors and a plurality of control circuits, each control circuit of the plurality of control circuits configured to control operation of a respective set of the actively-driven inductive sensors, each control circuit of the plurality of control circuits communicatively coupled to the other control circuits via a connection configured to distribute synchronization information among the plurality of control circuits. Each of the plurality of control circuits may further be configured to configure a schedule for controlling time-division multiplexed operation of its respective set of actively-driven inductive sensors and control time-division multiplexed operation of its respective set of actively-driven inductive sensors based on the schedule and the synchronization information in order to minimize interference among the plurality of actively-driven inductive sensors.

Multi-chip synchronization in sensor applications

Converting a single-bit audio stream to a stream of symbols with a constant edge rate

An encoding for data in an audio data stream may be indicated in the data stream using a footer stored in low-order bits of data frames in the audio data stream. When the audio data stream may include either Pulse Code Modulation (PCM) or Direct Stream Digital (DSD) data, PCM data may be marked with a footer to indicate the encoding as PCM. The footer may be a fixed value, an alternating fixed value, a predetermined sequence of values, or a value computed based on the PCM data. Examples of computed values for the footer marker may include an error code, an error correction code (ECC), and a scrambled code.

Pulse code modulation (PCM) data-marking

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.

On-chip resonance detection and transfer function mapping of resistive-inductive-capacitive sensors

A method for generating a not-yet (NYET) signal in a recovered reference system for recovering a device reference clock on a device, wherein the NYET signal indicates that the device is not yet ready for transition into a low power mode, in order to improve a quality of a recovered reference clock representative of a host reference clock of a host communicatively coupled to the device, may be provided. The method may include detecting receipt of start-of-frame markers from the host to the device, responsive to detecting receipt of the markers, determining whether a condition for NYET generation is being met, responsive to the condition for NYET generation being met, generating the NYET signal to cause the host to continue generating the markers, and responsive to the condition for NYET generation not being met, causing the device to generate an acknowledge signal for transition of the device into the low power mode.

Recovery of reference clock on a device

Growing community of inventors

Austin, TX, United States of America

Bruce Eliot Duewer