公开(公告)号：US08742684B2

公开(公告)日：2014-06-03

申请号：US13942220

申请日：2013-07-15

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson

IPC: H05B37/02

CPC classification number: H05B33/0815 ,  H05B33/0818 ,  H05B33/0848 ,  H05B33/086 ,  Y02B20/347

Abstract: A light emitting diode (LED) lighting system and method are disclosed. The LED lighting system and method include an LED controller to accurately control a current in an LED system. The LED controller includes components to calculate, based on the current and an active time period of an LED current time period, an actual charge amount delivered to the LED system wherein the LED current time period is duty cycle modulated at a rate of greater than fifty (50) Hz and to utilize the actual charge amount to modify and provide a desired target charge amount to be delivered during a future active time period of the LED current time period. The LED system and method further involve components to compare the actual charge amount to a desired charge amount for the active time period and compensate for a difference between the actual charge amount and the desired charge amount during the future active time period.

Abstract translation: 公开了一种发光二极管（LED）照明系统和方法。 LED照明系统和方法包括用于精确地控制LED系统中的电流的LED控制器。 LED控制器包括基于LED当前时间段的当前时间和当前时间周期来计算传送到LED系统的实际充电量的组件，其中LED电流时间周期以大于50的速率进行占空比调制 （50）Hz，并且利用实际电荷量来修改并提供在LED当前时间段的未来有效时间段期间要传送的期望目标电荷量。 LED系统和方法还包括将实际电荷量与活动时间段期望的电荷量进行比较的部件，并补偿在未来的有效时间段期间实际电荷量与期望充电量之间的差值。

公开(公告)号：US20140019247A1

公开(公告)日：2014-01-16

申请号：US13728347

申请日：2012-12-27

Applicant: CIRRUS LOGIC, INC.

Inventor： John L. Melanson

IPC: H04W24/00

CPC classification number: H04M1/72572 ,  G01S5/30

Abstract: A mobile device includes a display, a microphone, and a controller all within an enclosure sized and shaped such that the enclosure is readily transported on a person of a user of the mobile device. The microphone is configured to receive an audio signal from an audio signal source. The controller is coupled to the microphone and the display, and configured to, based at least on information included in the audio signal, determine a delay between a transmission of the audio signal from the audio signal source to receipt of the audio signal by the microphone. The controller is further configured to, based at least on the delay, determine a geographical location of the mobile device. The controller is also configured to, based on the geographical location of the mobile device, display geographical information to the display indicative of the geographical location.

Abstract translation: 移动设备包括显示器，麦克风和控制器，所有这些都在外壳内，其尺寸和形状使得外壳容易地在移动设备的用户的人员上传送。 麦克风被配置为从音频信号源接收音频信号。 控制器耦合到麦克风和显示器，并且被配置为至少基于包括在音频信号中的信息，确定音频信号从音频信号源到麦克风接收音频信号之间的延迟 。 控制器还被配置为至少基于延迟来确定移动设备的地理位置。 控制器还被配置为基于移动设备的地理位置，将地理信息显示到指示地理位置的显示器。

公开(公告)号：US20130300309A1

公开(公告)日：2013-11-14

申请号：US13942220

申请日：2013-07-15

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0818 ,  H05B33/0848 ,  H05B33/086 ,  Y02B20/347

Abstract: A light emitting diode (LED) lighting system and method are disclosed, The LED lighting system and method include an LED controller to accurately control a current in an LED system. The LED controller includes components to calculate, based on the current and an active time period of an LED current time period, an actual charge amount delivered to the LED system wherein the LED current time period is duty cycle modulated at a rate of greater than fifty (50) Hz and to utilize the actual charge amount to modify and provide a desired target charge amount to be delivered during a future active time period of the LED current time period, The LED system and method further involve components to compare the actual charge amount to a desired charge amount for the active time period and compensate for a difference between the actual charge amount and the desired charge amount during the future active time period.

Abstract translation: 公开了一种发光二极管（LED）照明系统和方法。该LED照明系统和方法包括：LED控制器，用于精确地控制LED系统中的电流。 LED控制器包括基于LED当前时间段的当前时间和当前时间周期来计算传送到LED系统的实际充电量的组件，其中LED电流时间周期以大于50的速率进行占空比调制 （50）Hz，并且利用实际充电量来修改并提供在LED当前时间段的未来有效时间段期间要传送的期望目标电荷量。LED系统和方法还包括用于比较实际充电量 达到期望的充电量，并且在未来的活动时间段期间补偿实际充电量与期望充电量之间的差。

公开(公告)号：US20130271027A1

公开(公告)日：2013-10-17

申请号：US13917194

申请日：2013-06-13

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H03K17/18 ,  H03K17/567 ,  H03K17/687 ,  H03K17/6872 ,  H03K17/74 ,  H05B33/0809 ,  H05B33/0818 ,  H05B33/0845 ,  H05B33/0848 ,  H05B33/0851 ,  H05B33/0887 ,  Y02B20/346 ,  Y02B20/347 ,  Y10S315/04 ,  Y10S323/905

Abstract: A light emitting diode (LED) lighting system includes a power factor correction (PFC) controller that determines at least one power factor correction control parameter from phase delays of a phase modulated signal. In at least one embodiment, a peak voltage of the phase modulated signal is a PFC control parameter used by the PFC controller to control power factor correction and generation of a link voltage by a PFC LED driver circuit. The phase delays. are related to a peak voltage of the phase modulated signal. Thus, in at least one embodiment, detecting the phase delay in one or more cycles of the phase modulated signal allows the PFC controller to determine the peak voltage of the phase modulated signal.

Abstract translation: 发光二极管（LED）照明系统包括功率因数校正（PFC）控制器，其从相位调制信号的相位延迟确定至少一个功率因数校正控制参数。 在至少一个实施例中，相位调制信号的峰值电压是由PFC控制器使用的PFC控制参数，以通过PFC LED驱动器电路来控制功率因数校正和产生链路电压。 相位延迟。 与相位调制信号的峰值电压有关。 因此，在至少一个实施例中，在相位调制信号的一个或多个周期中检测相位延迟允许PFC控制器确定相位调制信号的峰值电压。

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：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：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：US10033390B2

公开(公告)日：2018-07-24

申请号：US14747068

申请日：2015-06-23

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Roderick D. Holley ,  Jaimin Mehta

IPC: H01L35/00 ,  H01L37/00 ,  H03L1/02 ,  H03L7/099 ,  H03B5/32

Abstract: A system may include a sampling circuit, a temperature calibration system, a phase detector, a virtual phase-locked loop, and a sample rate converter. The sampling circuit may be configured to generate a series of digitally-sampled data at a sampling frequency provided by a local clock. The temperature calibration system may be configured to determine a temperature-based timing compensation with respect to the local clock. The phase detector may be configured to estimate an error of the local clock in view of the reference clock. The virtual phase-locked loop may be configured to generate a virtual clock based on the temperature-based timing compensation and the error. The sample rate converter may be configured to generate a corrected series of digitally-sampled data in response to the virtual clock by interpolating the series of digitally-sampled data to correct for the error.

公开(公告)号：US09998823B2

公开(公告)日：2018-06-12

申请号：US14507372

申请日：2014-10-06

Applicant: Cirrus Logic, Inc.

Inventor： Ku He ,  Tejasvi Das ,  John L. Melanson ,  Anniruddha Satoskar

IPC: H04R3/00 ,  H03G3/20 ,  H03G3/00 ,  H04R3/04 ,  H03G3/30 ,  H03G9/00

CPC classification number: H04R3/00 ,  H03G3/00 ,  H03G3/20 ,  H03G3/3005 ,  H03G3/3089 ,  H04R3/04 ,  H04R2430/00

Abstract: In accordance with embodiments of the present disclosure, a control circuit may be configured to, responsive to an indication to switch between gain modes of a signal path having an analog path portion and a digital signal path portion, switch a selectable analog gain of the analog path portion between a first analog gain and a second analog gain, switch a selectable digital gain of the digital signal path portion between a first digital gain and a second digital gain, wherein the product of the first analog gain and the first digital gain is approximately equal to the product of the second analog gain and the second digital gain, and control an analog response of the signal path to reduce the occurrence of audio artifacts present in the output signal as a result of the switch between gain modes of the signal path.A signal path may have an analog path portion and a digital signal path portion. The digital portion may have a selectable digitally-controlled gain and may be configured to convert a digital audio input signal into an analog input signal in conformity with the selectable digitally-controlled gain, the digital signal path portion comprising a modulator including a forward path and a feedback path. The forward path may include a loop filter for generating a filtered signal responsive to the digital audio input signal and a feedback signal, a quantizer responsive to the filtered signal for generating a quantized signal, and a first gain element configured to apply the selectable digitally-controlled gain to a signal within the forward path. The feedback path may be configured to generate the feedback signal responsive to the quantized signal, the feedback path including a second gain element having a gain inversely proportional to the selectable digitally-controlled gain.

公开(公告)号：US09596537B2

公开(公告)日：2017-03-14

申请号：US14483659

申请日：2014-09-11

Applicant: Cirrus Logic, Inc.

Inventor： Ku He ,  Tejasvi Das ,  John L. Melanson ,  Aniruddha Satoskar

IPC: H03G3/00 ,  H04R3/00 ,  H03G3/20 ,  H04R3/04 ,  H03G3/30 ,  H03F99/00

CPC classification number: H04R3/00 ,  H03G3/00 ,  H03G3/20 ,  H03G3/3005 ,  H03G3/3089 ,  H04R3/04 ,  H04R2430/00

Abstract: In accordance with embodiments of the present disclosure, a control circuit may be configured to, responsive to an indication to switch between gain modes of a signal path having an analog path portion and a digital signal path portion, switch a selectable analog gain of the analog path portion between a first analog gain and a second analog gain, switch a selectable digital gain of the digital signal path portion between a first digital gain and a second digital gain, wherein the product of the first analog gain and the first digital gain is approximately equal to the product of the second analog gain and the second digital gain, and control an analog response of the signal path to reduce the occurrence of audio artifacts present in the output signal as a result of the switch between gain modes of the signal path.A signal path may have an analog path portion and a digital signal path portion. The digital portion may have a selectable digitally-controlled gain and may be configured to convert a digital audio input signal into an analog input signal in conformity with the selectable digitally-controlled gain, the digital signal path portion comprising a modulator including a forward path and a feedback path. The forward path may include a loop filter for generating a filtered signal responsive to the digital audio input signal and a feedback signal, a quantizer responsive to the filtered signal for generating a quantized signal, and a first gain element configured to apply the selectable digitally-controlled gain to a signal within the forward path. The feedback path may be configured to generate the feedback signal responsive to the quantized signal, the feedback path including a second gain element having a gain inversely proportional to the selectable digitally-controlled gain.

Abstract translation: 信号路径可以具有模拟路径部分和数字信号路径部分。 数字部分可以具有可选择的数字控制的增益，并且可以被配置为将数字音频输入信号转换成符合可选数字控制的增益的模拟输入信号，数字信号路径部分包括调制器，包括前向路径和 反馈路径。 正向路径可以包括环路滤波器，用于响应于数字音频输入信号和反馈信号产生经滤波的信号，响应于经滤波的信号产生量化信号的量化器，以及第一增益元件，被配置为将可选择的数字 - 控制增益到正向路径内的信号。 反馈路径可以被配置为响应于量化信号产生反馈信号，反馈路径包括具有与可选数字控制增益成反比的增益的第二增益元件。