公开(公告)号：US20040174901A1

公开(公告)日：2004-09-09

申请号：US10799831

申请日：2004-03-13

Applicant: Cirrus Logic, Inc

Inventor： Amar Ghori ,  John White

IPC: H04J003/16

CPC classification number: H04N9/641 ,  H04N5/38 ,  H04N5/4401 ,  H04N21/4622 ,  H04W76/10

Abstract: The invention provides a method and apparatus for incorporating an appliance into a computer system. One embodiment of the invention has a computer with a first digital wireless transceiver, and an appliance unit with a second digital wireless transceiver for communicatively coupling to the first wireless transceiver. This appliance unit also has (1) an output device, communicatively coupled to the second wireless transceiver, for presenting an output presentation based on signals received from the computer via the wireless transceivers, and (2) an input device, communicatively coupled to the second wireless transceiver, for receiving input signals from a operator of the appliance unit.

Abstract translation: 本发明提供了一种用于将设备并入到计算机系统中的方法和装置。 本发明的一个实施例具有具有第一数字无线收发器的计算机，以及具有用于通信地耦合到第一无线收发器的第二数字无线收发器的设备单元。 该设备单元还具有（1）通信地耦合到第二无线收发器的输出设备，用于经由无线收发器基于从计算机接收的信号呈现输出呈现，以及（2）输入设备，通信地耦合到第二 无线收发器，用于接收来自设备单元的操作者的输入信号。

公开(公告)号：US20040172486A1

公开(公告)日：2004-09-02

申请号：US10785129

申请日：2004-02-24

Applicant: Cirrus Logic, Inc.

Inventor： Amar Ghori ,  John White

IPC: G06F003/00

CPC classification number: H04N9/641 ,  H04N5/38 ,  H04N5/4401 ,  H04N21/4104 ,  H04N21/4131 ,  H04N21/43615 ,  H04N21/43637 ,  H04N21/443 ,  H04W76/10

Abstract: The invention provides a method and apparatus for incorporating an appliance into a computer system. One embodiment of the invention has a computer with a first digital wireless transceiver, and an appliance unit with a second digital wireless transceiver for communicatively coupling to the first wireless transceiver. This appliance unit also has (1) an output device, communicatively coupled to the second wireless transceiver, for presenting an output presentation based on signals received from the computer via the wireless transceivers, and (2) an input device, communicatively coupled to the second wireless transceiver, for receiving input signals from a operator of the appliance unit.

公开(公告)号：US20040004565A1

公开(公告)日：2004-01-08

申请号：US10191016

申请日：2002-07-08

Applicant: Cirrus Logic, Inc.

Inventor： John Laurence Melanson

IPC: H03M003/00

CPC classification number: H03M7/3006 ,  H03M7/3026 ,  H03M7/304

Abstract: A noise shaper including a filter system for generating a first set of poles and zeros characterizing noise attenuation in a signal baseband of a noise transfer function and at least one additional set of at least one pole and one zero characterizing noise attenuation in at least one additional band outside the baseband of the noise transfer function.

公开(公告)号：US20020147753A1

公开(公告)日：2002-10-10

申请号：US09773058

申请日：2001-01-30

Applicant: Cirrus Logic, Inc.

Inventor： Raghunath Rao ,  Girish Subramaniam

IPC: G06F007/38

CPC classification number: G06F7/552 ,  G06F7/483

Abstract: A method of calculating xM/N, x having a range and M and N integers. The range of x is partitioned into a selected number of intervals and a determination is made as to the interval into which x falls. x is normalized with a normalization factor calculated for the interval into which x falls to obtain a normalized value xnull within a normalized range. A value of xnullM/N is calculated over the normalized range and a value for xM/N is calculated by multiplying the calculated value of xnullM/N by a renormalization factor calculated for the interval in which x falls.

Abstract translation: 一种计算具有范围和M和N个整数的xM / N，x的方法。 x的范围被分割成选定数量的间隔，并且确定x落入的间隔。 x用对于x下降的间隔计算的归一化因子进行归一化，以获得标准化范围内的归一化值x'。 在标准化范围内计算x'M / N的值，并且通过将x'M / N的计算值乘以x计算的间隔的重新归一化因子来计算xM / N的值。

公开(公告)号：US10812024B2

公开(公告)日：2020-10-20

申请号：US14706587

申请日：2015-05-07

Applicant: Cirrus Logic, Inc.

Inventor： Eric J. King ,  John L. Melanson ,  Siddharth Maru

IPC: H03F1/08 ,  H02M3/158 ,  H03F3/217 ,  H03F1/02 ,  H03F3/181 ,  H02M7/00 ,  H02M7/48

Abstract: In accordance with embodiments of the present disclosure, a system may include an impedance estimator configured to estimate an impedance of a load and generate a target current based at least on an input voltage and the impedance, a voltage feedback loop responsive to a difference between the input voltage and an output voltage of the load, and a current controller configured to, responsive to the voltage feedback loop, the impedance estimator, and the input voltage, generate an output current to the load.

公开(公告)号：US10468048B2

公开(公告)日：2019-11-05

申请号：US14578567

申请日：2014-12-22

Applicant: Cirrus Logic, Inc.

Inventor： Nitin Kwatra ,  Jeffrey Alderson ,  Jon D. Hendrix

IPC: G10L21/0208 ,  G10K11/175 ,  G10K11/178 ,  H04M1/20

Abstract: A personal audio device, such as a wireless telephone, includes noise canceling circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone may also be provided proximate the speaker to estimate an electro-acoustical path from the noise canceling circuit through the transducer. A processing circuit uses the reference and/or error microphone, optionally along with a microphone provided for capturing near-end speech, to determine whether one of the reference or error microphones is obstructed by comparing their received signal content and takes action to avoid generation of erroneous anti-noise.

公开(公告)号：US10401886B1

公开(公告)日：2019-09-03

申请号：US14813549

申请日：2015-07-30

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Rahul Singh ,  Prashanth Drakshappalli ,  Dale Brummel

IPC: G05F1/565 ,  G05F1/46 ,  G05F1/56

Abstract: A system may include a first voltage reference for generating a first voltage for operating a circuit, a second voltage reference having a higher precision than the first voltage reference, and a controller. The controller may be configured to determine a presence or an absence of a condition for calibrating the first voltage reference. The controller may also be configured to, responsive to the presence of the condition, enable the second voltage reference to generate a second voltage for calibrating the first voltage reference. The controller may further be configured to, responsive to the absence of the condition, disable the second voltage reference.

公开(公告)号：US10249284B2

公开(公告)日：2019-04-02

申请号：US15786701

申请日：2017-10-18

Applicant: Cirrus Logic, Inc.

Inventor： Nitin Kwatra ,  Ali Abdollahzadeh Milani ,  Jeffrey Alderson

IPC: G10K11/178 ,  H04R1/10 ,  G10L21/0208 ,  G10L21/0364

Abstract: A personal audio device, such as a wireless telephone, includes noise canceling that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is provided proximate the speaker to measure the output of the transducer in order to control the adaptation of the anti-noise signal and to estimate an electro-acoustical path from the noise canceling circuit through the transducer. The anti-noise signal is adaptively generated to minimize the ambient audio sounds at the error microphone. A processing circuit that performs the adaptive noise canceling (ANC) function also filters one or both of the reference and/or error microphone signals, to bias the adaptation of the adaptive filter in one or more frequency regions to alter a degree of the minimization of the ambient audio sounds at the error microphone.

公开(公告)号：US10225653B2

公开(公告)日：2019-03-05

申请号：US15675314

申请日：2017-08-11

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric Swanson

IPC: H04R17/00 ,  H04R3/00 ,  H04R1/10 ,  H04R3/04 ,  H04R1/04 ,  H04W52/02 ,  H04R19/04 ,  H04R19/02

Abstract: In accordance with embodiments of the present disclosure, a device may include a piezoelectric speaker for generating sound, a microphone, and a controller communicatively coupled to the speaker and the microphone. The controller may be configured to receive a first signal from the piezoelectric speaker, the first signal induced at least in part by sound incident on the speaker other than sound generated by the piezoelectric speaker, receive a second signal from the microphone, the second signal induced by sound incident on the microphone, process at least one of the first signal and the second signal to determine at least one characteristic of sound incident upon at least one of the piezoelectric speaker and the microphone, and select at least one of the microphone and the piezoelectric speaker as a signal source for incident sound based on the at least one characteristic.

公开(公告)号：US10206032B2

公开(公告)日：2019-02-12

申请号：US13962515

申请日：2013-08-08

Applicant: Cirrus Logic, Inc.

Inventor： Jeffrey D. Alderson ,  Jon D. Hendrix ,  Antonio J. Miller ,  Robert G. Kratsas ,  Jens-Peter B. Axelsson ,  Dayong Zhou ,  Yang Lu ,  Chin Huang Yong

IPC: H04R3/00 ,  G10K11/178

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.