公开(公告)号：US10116473B1

公开(公告)日：2018-10-30

申请号：US15926395

申请日：2018-03-20

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Pradeep Dhananjay ,  Tejasvi Das ,  Bhupendra Manola ,  Bruce E. Duewer

IPC: H04L25/49 ,  H04L25/03 ,  H04R3/04 ,  H04B14/04

CPC classification number: H04L25/4927 ,  H03F1/0227 ,  H03F1/025 ,  H03F3/187 ,  H03F3/213 ,  H03F2200/03 ,  H03F2200/331 ,  H04B14/046 ,  H04L25/03159 ,  H04R3/04

Abstract: An apparatus may include a delta-sigma modulator for quantization noise shaping of a digital signal, a digital-to-analog converter configured to generate an analog signal from the digital signal, and an amplifier configured to amplify the analog signal and powered from a charge pump, wherein the charge pump is configured to operate at a switching frequency approximately equal to a zero of a modulator noise transfer function of the delta-sigma modulator, such that the impact of charge pump noise on a total harmonic distortion noise of the apparatus is minimized.

公开(公告)号：US11536758B2

公开(公告)日：2022-12-27

申请号：US16517046

申请日：2019-07-19

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jason L. Wardlaw ,  Michael A. Kost ,  Anthony S. Doy ,  Tejasvi Das ,  Siddharth Maru ,  Xin Zhao ,  Matthew Beardsworth ,  Bruce E. Duewer

IPC: G01R27/28 ,  G01L9/00 ,  G01H13/00 ,  G01R27/26 ,  G01R27/02 ,  G06F3/01

Abstract: 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.

公开(公告)号：US11107485B2

公开(公告)日：2021-08-31

申请号：US16530798

申请日：2019-08-02

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Shafagh Kamkar ,  Dylan A. Hester ,  Bruce E. Duewer

IPC: H03M5/08 ,  G10L19/16 ,  H03M5/14 ,  G06F3/16 ,  G10L19/02 ,  G10L19/032 ,  G10L19/26

Abstract: 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.

公开(公告)号：US11050971B2

公开(公告)日：2021-06-29

申请号：US16694362

申请日：2019-11-25

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Shafagh Kamkar ,  Bruce E. Duewer ,  Dylan A. Hester

IPC: H04N9/80 ,  H04N5/926 ,  H03M13/47 ,  H03M13/09 ,  G11B20/18 ,  G11B20/10 ,  H03M13/29

Abstract: 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.

公开(公告)号：US10522155B2

公开(公告)日：2019-12-31

申请号：US15693900

申请日：2017-09-01

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Shafagh Kamkar ,  Bruce E. Duewer ,  Dylan A. Hester

IPC: G10L19/00 ,  G10L19/005 ,  H04L1/00 ,  G10L19/16 ,  G10L19/22 ,  G11B20/00 ,  G11B20/10

Abstract: 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.

公开(公告)号：US20180240464A1

公开(公告)日：2018-08-23

申请号：US15693900

申请日：2017-09-01

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Shafagh Kamkar ,  Bruce E. Duewer ,  Dylan A. Hester

IPC: G10L19/005 ,  H04L1/00 ,  G10L19/16 ,  G10L19/22

Abstract: 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.

公开(公告)号：US20180166088A1

公开(公告)日：2018-06-14

申请号：US15373745

申请日：2016-12-09

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Bruce E. Duewer ,  Dylan A. Hester ,  Shafagh Kamkar

IPC: G10L19/16 ,  G10L19/22 ,  G06F3/16

CPC classification number: G10L19/167 ,  G06F3/165 ,  G10L19/22

Abstract: A data encoding may be determined by examining the data itself. By examining the data, such as by identifying characteristics of the data, the data encoding may be identified and the substantive information extracted from the data by decoding the data according to the identified data encoding. The data encoding may be identified without extra control or header information separate from the encoded data itself. The identification of data encoding may be determined by a plurality of detectors examining different characteristics of the data and determining an encoding of the data based on each of those individual characteristics. The output of the detectors may be collected and used to decide the encoding of the data. One example application involves determining if audio data is DSD- or PCM-encoded audio data by examining only the data itself.

公开(公告)号：US11836290B2

公开(公告)日：2023-12-05

申请号：US17157304

申请日：2021-01-25

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Michael A. Kost ,  Bruce E. Duewer ,  Tejasvi Das ,  Matthew Beardsworth ,  Anthony S. Doy

IPC: G06F3/01 ,  G01D5/14 ,  G01D5/24 ,  G01D5/20 ,  G01D5/16

CPC classification number: G06F3/016 ,  G01D5/14 ,  G01D5/16 ,  G01D5/20 ,  G01D5/24

Abstract: 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.

公开(公告)号：US11507267B2

公开(公告)日：2022-11-22

申请号：US17471529

申请日：2021-09-10

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Hamid Sepehr ,  Pablo Peso Parada ,  Willem Zwart ,  Tom Birchall ,  Michael Allen Kost ,  Tejasvi Das ,  Siddharth Maru ,  Matthew Beardsworth ,  Bruce E. Duewer

IPC: G06F3/0488 ,  G06F3/041 ,  G01L5/162 ,  G01L5/165 ,  G01L5/167 ,  G01L5/164

Abstract: 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.

公开(公告)号：US20210099667A1

公开(公告)日：2021-04-01

申请号：US16694362

申请日：2019-11-25

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Shafagh Kamkar ,  Bruce E. Duewer ,  Dylan A. Hester

IPC: H04N5/926 ,  H03M13/47 ,  H03M13/09 ,  H03M13/29 ,  G11B20/18 ,  G11B20/10

Abstract: 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.