公开(公告)号：US20180152198A1

公开(公告)日：2018-05-31

申请号：US15878907

申请日：2018-01-24

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John Paul LESSO ,  Emmanuel Philippe Christian HARDY

IPC: H03M7/30 ,  H03M1/50 ,  H03M1/18 ,  H03K9/08 ,  H03K7/08 ,  H03M3/00

CPC classification number: H03M7/30 ,  H03K7/08 ,  H03K9/08 ,  H03M1/18 ,  H03M1/181 ,  H03M1/50 ,  H03M1/504 ,  H03M3/484

Abstract: This application relates to analogue-to-digital converters (ADCs). An ADC 200 has a first converter (201) for receiving an analogue input signal (AIN) and outputting a time encode signal (DT), such as a pulse-width-modulated (PWM) signal, based on input signal and a first conversion gain setting (GIN). In some embodiments the first converter has a PWM modulator (401) for generating a PWM signal such that the input signal is encoded by pulse widths that can vary continuously in time. A second converter (202) receives the time encoded signal and outputs a digital output signal (DOUT) based on the time encoded signal (DT) and a second conversion gain setting (GO). The second converter may have a first PWM-to-digital modulator (403). A gain allocation block (204) generates the first and second conversion gain settings based on the time encoded signal (DT). The gain allocation block (204) may have a second PWM-to-digital modulator (203) which may be of lower latency and/or lower resolution that the first PWM-to-digital modulator (403).

公开(公告)号：US20180040325A1

公开(公告)日：2018-02-08

申请号：US15666267

申请日：2017-08-01

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John Laurence MELANSON ,  John Paul LESSO

IPC: G10L17/24 ,  G10L17/06 ,  G10L17/02

CPC classification number: G10L17/24 ,  G10L17/02 ,  G10L17/06

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.

公开(公告)号：US20170284825A1

公开(公告)日：2017-10-05

申请号：US15628057

申请日：2017-06-20

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John Paul LESSO ,  Emmanuel Philippe Christian HARDY ,  James Thomas DEAS ,  Toru IDO

IPC: H04R3/06 ,  G01D5/24 ,  G01D5/244 ,  G01P15/125 ,  H03M1/06 ,  H03M3/00 ,  H04R19/00 ,  H04R19/04 ,  G01D3/02 ,  G01P15/08 ,  H03M1/12 ,  H04R29/00

CPC classification number: H04R3/06 ,  G01D3/02 ,  G01D5/24 ,  G01D5/24476 ,  G01P15/125 ,  G01P2015/0865 ,  H03M1/0609 ,  H03M1/12 ,  H03M3/352 ,  H03M3/458 ,  H04R19/005 ,  H04R19/04 ,  H04R29/004 ,  H04R2201/003 ,  H04R2499/11

Abstract: This application relates to circuitry for processing sense signals generated by MEMS capacitive transducers for compensating for distortion in such sense signals. The circuitry has a signal path between an input (204) for receiving the sense signal and an output (205) for outputting an output signal based on said sense signal. Compensation circuitry (206, 207) is configured to monitor the signal at a first point along the signal path and generate a correction signal (Scorr); and modify the signal at at least a second point along said signal path based on said correction signal. The correction signal is generated as a function of the value of the signal at the first point along the signal path so as to introduce compensation components into the output signal that compensate for distortion components in the sense signal. The first point in the signal path may be before or after the second point in the signal path. The monitoring may be performed in an analogue or a digital part of the signal path and in either case the modification may be applied in an analogue or a digital part of the signal path.

公开(公告)号：US20170251303A1

公开(公告)日：2017-08-31

申请号：US15439480

申请日：2017-02-22

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John Paul LESSO ,  John Laurence MELANSON

IPC: H04R3/06 ,  H04R19/00 ,  H04R19/04

CPC classification number: H04R3/06 ,  H04R3/00 ,  H04R19/005 ,  H04R19/04 ,  H04R2201/003 ,  H04R2217/03 ,  H04R2410/00 ,  H04R2420/09 ,  H04R2430/03 ,  H04R2499/11

Abstract: This application relates to methods and apparatus for digital microphones. Disclosed is a digital microphone apparatus (300) for outputting a digital output signal (DATA) at a sample rate defined by a received clock signal (CLK). The apparatus includes a band splitter (302) configured to receive a microphone signal (SMD) indicative of an output of a microphone transducer and split said microphone signal into first signal path (SP1) for frequencies in a first band and a second signal path (SP2) for frequencies in a second band, the frequencies of the second band being higher than the frequencies in the first band. A modulation block (304) is configured to operate on the second signal path to apply a selective gain modulation to signals in the second signal path.

公开(公告)号：US20230389334A1

公开(公告)日：2023-11-30

申请号：US18323838

申请日：2023-05-25

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John Paul LESSO ,  Gordon James BATES

IPC: H10B61/00 ,  G06N3/02 ,  G11C11/16 ,  H10N50/10

CPC classification number: H10B61/10 ,  H10N50/10 ,  G11C11/165 ,  G06N3/02

Abstract: There is described a two-terminal multi-level memristor element synthesised from binary memristors, which is configured to implement a variable resistance based on unary or binary code words. There is further described a circuit such as a synapse circuit implemented using a multi-level memristor element.

公开(公告)号：US20230387705A1

公开(公告)日：2023-11-30

申请号：US17824687

申请日：2022-05-25

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John Paul LESSO ,  Toru IDO ,  Claire MOTION

IPC: H02J7/00 ,  G01N27/403 ,  H02J7/34 ,  G01R31/385

CPC classification number: H02J7/0048 ,  G01N27/403 ,  H02J7/007 ,  H02J7/34 ,  G01R31/385

Abstract: Apparatus for delivering power from a battery node of a battery to an output node, the output node coupled to an analyte monitoring device, the apparatus comprising: a slow charging path between the battery node and the output node; a fast charging path parallel to the slow charging path, the fast charging path switchably coupled between the battery node and the output node; and control circuitry configured to: selectively couple the fast charging path between the battery node and the output node to allow faster transfer of charge between the battery node and the output node than the slow charging path.

公开(公告)号：US20230290335A1

公开(公告)日：2023-09-14

申请号：US18318269

申请日：2023-05-16

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John Paul LESSO ,  Toru IDO

IPC: G10L15/06 ,  G10L19/26 ,  G10L25/78

CPC classification number: G10L15/06 ,  G10L19/26 ,  G10L25/78 ,  G10L2025/937

Abstract: A method of detecting live speech comprises: receiving a signal containing speech; obtaining a first component of the received signal in a first frequency band, wherein the first frequency band includes audio frequencies; and obtaining a second component of the received signal in a second frequency band higher than the first frequency band. Then, modulation of the first component of the received signal is detected; modulation of the second component of the received signal is detected; and the modulation of the first component of the received signal and the modulation of the second component of the received signal are compared. It may then be determined that the speech may not be live speech, if the modulation of the first component of the received signal differs from the modulation of the second component of the received signal.

公开(公告)号：US20230247362A1

公开(公告)日：2023-08-03

申请号：US18296266

申请日：2023-04-05

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John Paul LESSO ,  Mark James MCCLOY-STEVENS ,  John Bruce BOWLERWELL ,  Yanto SURYONO ,  Xin ZHAO ,  Morgan Timothy PRIOR

IPC: H04R5/04 ,  H03F3/183 ,  H03G3/30 ,  H04R29/00 ,  H04S1/00 ,  H04R5/02

CPC classification number: H04R5/04 ,  H03F3/183 ,  H03G3/3005 ,  H04R29/001 ,  H04S1/007 ,  H04R5/02 ,  H03G2201/103

Abstract: This application relates to audio driving circuitry (100), and in particular to audio driving circuitry for outputting first and second audio driving signals for driving a stereo audio load (106), which may be a stereo audio load of an accessory apparatus (102) removably coupled to the audio driving circuitry in use. A load monitor (111) is provided for monitoring to monitor, from a monitoring node (112), an indication of a common mode return current passing through a common return path, together with an indication of a common mode component of the first and second audio driving signals and to determine an impedance characteristic of the stereo audio load. The load monitor (111) can provide dynamic monitoring of any significant change in load impedance. In some embodiments the load monitor (111) comprises an adaptive filter (301) which adapts a parameter of the filter which is related to the load impedance so as to determine the indication of load impedance.

公开(公告)号：US20230005470A1

公开(公告)日：2023-01-05

申请号：US17943745

申请日：2022-09-13

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John Paul LESSO

IPC: G10L15/07 ,  G10L15/28 ,  G06F1/16

Abstract: A method of own voice detection is provided for a user of a device. A first signal is detected, representing air-conducted speech using a first microphone of the device. A second signal is detected, representing bone-conducted speech using a bone-conduction sensor of the device. The first signal is filtered to obtain a component of the first signal at a speech articulation rate, and the second signal is filtered to obtain a component of the second signal at the speech articulation rate. The component of the first signal at the speech articulation rate and the component of the second signal at the speech articulation rate are compared, and it is determined that the speech has not been generated by the user of the device, if a difference between the component of the first signal at the speech articulation rate and the component of the second signal at the speech articulation rate exceeds a threshold value.

公开(公告)号：US20220085814A1

公开(公告)日：2022-03-17

申请号：US17536637

申请日：2021-11-29

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John Laurence PENNOCK ,  John Paul LESSO

IPC: H03K19/0948 ,  H03K17/16 ,  H03K19/003 ,  H03M1/00

Abstract: This application relates to control of semiconductor devices, in particular MOS devices, so as to reduce RTS/flicker noise. A circuit (100) includes a first MOS device (103, 104) and a bias controller (107). The circuit is operable in at least a first circuit state (PRO) in which the first MOS device is active to contribute to a first signal (Sout) and a second circuit state (PRST) in which the first MOS device does not contribute to the first signal. The bias controller is operable to control voltages at one or more terminals of the first MOS device to apply a pre-bias (VPB1, VPB2) during an instance of the second circuit state. The pre-bias is applied to set an occupancy state of charge carriers traps within the first MOS device, to limit noise during subsequent operation in the first circuit state. In embodiments, the bias controller is configured so that at least one parameter of the pre-bias is selectively variable in use based on one or more operating conditions.