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公开(公告)号：US09831843B1
公开(公告)日：2017-11-28
申请号：US14204793
申请日：2014-03-11
Applicant: Cirrus Logic, Inc.
Inventor： Tejasvi Das , Bharath Kumar Thandri , Anand Ilango , Aniruddha Satoskar , Daniel John Allen , Xiaofan Fei
CPC classification number: H03G3/20 , H03G3/001 , H03G3/002 , H03G3/02 , H03G3/3005 , H03G3/3026 , H03M1/66 , H03M1/70
Abstract: An audio playback path of an audio apparatus includes a digital modulator, a digital-to-analog converter (DAC), and a power amplifier. The digital modulator receives a playback signal corresponding to playback audio content and generates a digital input signal in accordance with the playback signal. The DAC receives the audio input signal and generates an analog preamplifier signal. The power amplifier generates an audio output signal in accordance with the preamplifier signal and an analog attenuation determined by the analog attenuation signal. The apparatus may include a volume control input to receive a volume control signal and a playback controller configured to perform operations including generating an analog attenuation signal in accordance with the volume control signal, monitoring a playback state indicated by the playback parameters, and responsive to detecting the playback state satisfying the playback criterion, modifying a selected playback parameter to improve a performance parameter of the playback path.
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公开(公告)号：US20160173112A1
公开(公告)日：2016-06-16
申请号：US15050857
申请日：2016-02-23
Applicant: Cirrus Logic, Inc.
Inventor： Tejasvi Das , John L. Melanson
CPC classification number: H03M1/002 , H03M1/0845 , H03M1/66 , H03M1/662 , H03M1/68 , H03M1/70 , H03M1/785 , H03M3/32 , H03M3/392 , H03M3/414 , H03M3/416 , H03M3/50
Abstract: In accordance with embodiments of the present disclosure, a processing system may include a plurality of processing paths including a first processing path and a second processing path, a digital-to-analog stage output, and a controller. The first processing path may include a first digital-to-analog converter for converting the digital input signal into a first intermediate analog signal, the first digital-to-analog converter configured to operate in a high-power state and a low-power state. The second processing path may include a second digital-to-analog converter for converting a digital input signal into a second intermediate analog signal. The digital-to-analog stage output may be configured to generate an analog signal comprising a sum of the first intermediate analog signal and the second intermediate analog signal. The controller may be configured to operate the first digital-to-analog converter in the lower-power state when a magnitude of the digital input signal is below a threshold magnitude.
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公开(公告)号：US09337795B2
公开(公告)日：2016-05-10
申请号：US14481201
申请日：2014-09-09
Applicant: Cirrus Logic, Inc.
Inventor： Tejasvi Das , Xin Zhao , Ted Burk , Ku He , John L. Melanson , Xiaofan Fei
CPC classification number: H03G3/20 , H03G3/001 , H03G3/002 , H03G3/3005 , H03G3/3089
Abstract: A signal path may operate in one of a plurality of gain modes such that for each gain mode, the product of a digital gain and an analog signal gain of the signal path associated with the particular gain mode are approximately equal to a fixed path gain. During each of one or more calibration phases, a calibration system may measure analog signals at a plurality of nodes of the first path portion, calculate an actual analog gain associated with the gain mode based on the analog signals measured at the plurality of nodes, calculate an error between the fixed path gain and a mathematical product of the actual analog gain associated with the gain mode and the digital gain associated with the gain mode, and modify at least one of the digital gain and the analog gain associated with the gain mode in conformity with the error.
Abstract translation: 信号路径可以以多种增益模式之一操作，使得对于每个增益模式，与特定增益模式相关联的信号路径的数字增益和模拟信号增益的乘积近似等于固定路径增益。 在一个或多个校准阶段的每一个期间，校准系统可以测量第一路径部分的多个节点处的模拟信号，基于在多个节点处测量的模拟信号来计算与增益模式相关联的实际模拟增益，计算 固定路径增益与与增益模式相关联的实际模拟增益与与增益模式相关联的数字增益的数学乘积之间的误差，并且修改与增益模式相关联的数字增益和模拟增益中的至少一个 符合错误。
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14.发明授权公开(公告)号：US09301046B1
公开(公告)日：2016-03-29
申请号：US14039662
申请日：2013-09-27
Applicant: Cirrus Logic, Inc.
Inventor： Tejasvi Das , Xiaofan Fei , Miao Song
IPC: H04R3/00
CPC classification number: H04R3/04 , H04R1/1041
Abstract: A control circuit coupled to a differential audio output stage may, responsive to a transition in a power supply voltage generated by a power supply, modify at least one of: (i) a first bandwidth associated with the power supply; (ii) a second bandwidth associated with a common-mode voltage generator for generating a desired output common-mode voltage based on the power supply voltage; and (iii) a third bandwidth associated with a common-mode feedback loop of the audio-output stage for setting an actual common-mode voltage at each of the pair of differential output terminals based on the desired output common-mode voltage; such that the second bandwidth is greater than or substantially equal to the first bandwidth during the transition and the third bandwidth is greater than or substantially equal to the second bandwidth during the transition.
Abstract translation: 耦合到差分音频输出级的控制电路可以响应于由电源产生的电源电压的转变来修改以下至少一个：（i）与电源相关联的第一带宽; （ii）与共模电压发生器相关联的第二带宽，用于基于所述电源电压产生期望的输出共模电压; 以及（iii）与所述音频输出级的共模反馈回路相关联的第三带宽，用于基于所述期望的输出共模电压来设置所述一对差分输出端中的每一对的实际共模电压; 使得第二带宽大于或基本上等于转换期间的第一带宽，并且第三带宽在转换期间大于或基本等于第二带宽。
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Patent Agency Ranking
公开(公告)号：US09680488B2
公开(公告)日：2017-06-13
申请号：US15050857
申请日：2016-02-23
Applicant: Cirrus Logic, Inc.
Inventor： Tejasvi Das , John L. Melanson , John C. Tucker , Xiaofan Fei
CPC classification number: H03M1/002 , H03M1/0845 , H03M1/66 , H03M1/662 , H03M1/68 , H03M1/70 , H03M1/785 , H03M3/32 , H03M3/392 , H03M3/414 , H03M3/416 , H03M3/50
Abstract: In accordance with embodiments of the present disclosure, a processing system may include a plurality of processing paths including a first processing path and a second processing path, a digital-to-analog stage output, and a controller. The first processing path may include a first digital-to-analog converter for converting the digital input signal into a first intermediate analog signal, the first digital-to-analog converter configured to operate in a high-power state and a low-power state. The second processing path may include a second digital-to-analog converter for converting a digital input signal into a second intermediate analog signal. The digital-to-analog stage output may be configured to generate an analog signal comprising a sum of the first intermediate analog signal and the second intermediate analog signal. The controller may be configured to operate the first digital-to-analog converter in the lower-power state when a magnitude of the digital input signal is below a threshold magnitude.
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公开(公告)号：US09391576B1
公开(公告)日：2016-07-12
申请号：US14083972
申请日：2013-11-19
Applicant: Cirrus Logic, Inc.
Inventor： Aniruddha Satoskar , Daniel John Allen , Tejasvi Das
CPC classification number: H03G3/3026 , H03G3/001 , H03G3/002 , H03G3/3005 , H03M1/186 , H03M1/66 , H03M1/70
Abstract: In accordance with embodiments of the present disclosure, an apparatus for providing an output signal to an audio transducer may include an analog signal path portion, a digital-to-analog converter (DAC), and a control circuit. The analog signal path portion may have an audio input for receiving an analog input signal, an audio output for providing the output signal, and a selectable analog attenuation, and may be configured to generate the output signal based on the analog input signal and in conformity with the selectable analog attenuation. The DAC may have a selectable digital gain and may be configured to convert a digital audio input signal into the analog input signal in conformity with the selectable digital gain. The control circuit may be configured to select the selectable analog attenuation and select the selectable digital gain based on a magnitude of a signal indicative of the output signal.
Abstract translation: 根据本公开的实施例，用于向音频换能器提供输出信号的装置可以包括模拟信号路径部分，数模转换器（DAC）和控制电路。 模拟信号路径部分可以具有用于接收模拟输入信号的音频输入，用于提供输出信号的音频输出和可选择的模拟衰减，并且可以被配置为基于模拟输入信号生成输出信号 具有可选择的模拟衰减。 DAC可以具有可选择的数字增益，并且可以被配置为根据可选择的数字增益将数字音频输入信号转换成模拟输入信号。 控制电路可以被配置为基于指示输出信号的信号的大小来选择可选择的模拟衰减并选择可选数字增益。
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公开(公告)号：US09306588B2
公开(公告)日：2016-04-05
申请号：US14680830
申请日：2015-04-07
Applicant: Cirrus Logic, Inc.
Inventor： Tejasvi Das , John L. Melanson , John C. Tucker , Xiaofan Fei
CPC classification number: H03M1/002 , H03M1/0845 , H03M1/66 , H03M1/662 , H03M1/68 , H03M1/70 , H03M1/785 , H03M3/32 , H03M3/392 , H03M3/414 , H03M3/416 , H03M3/50
Abstract: In accordance with embodiments of the present disclosure, a processing system may include a plurality of processing paths including a first processing path and a second processing path, a digital-to-analog stage output, and a controller. The first processing path may include a first digital-to-analog converter for converting the digital input signal into a first intermediate analog signal, the first digital-to-analog converter configured to operate in a high-power state and a low-power state. The second processing path may include a second digital-to-analog converter for converting a digital input signal into a second intermediate analog signal. The digital-to-analog stage output may be configured to generate an analog signal comprising a sum of the first intermediate analog signal and the second intermediate analog signal. The controller may be configured to operate the first digital-to-analog converter in the lower-power state when a magnitude of the digital input signal is below a threshold magnitude.
Abstract translation: 根据本公开的实施例，处理系统可以包括多个处理路径，包括第一处理路径和第二处理路径，数模转换阶段输出和控制器。 第一处理路径可以包括用于将数字输入信号转换成第一中间模拟信号的第一数模转换器，第一数模转换器被配置为在大功率状态和低功率状态 。 第二处理路径可以包括用于将数字输入信号转换成第二中间模拟信号的第二数模转换器。 数模转换级输出可以被配置为产生包括第一中间模拟信号和第二中间模拟信号之和的模拟信号。 控制器可以被配置为当数字输入信号的幅度低于阈值大小时，在较低功率状态下操作第一数模转换器。
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18.发明申请公开(公告)号：US20160080862A1
公开(公告)日：2016-03-17
申请号：US14483659
申请日：2014-09-11
Applicant: Cirrus Logic, Inc.
Inventor： Ku He , Tejasvi Das , John L. Melanson
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.
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19.发明申请REDUCING AUDIO ARTIFACTS IN A SYSTEM FOR ENHANCING DYNAMIC RANGE OF AUDIO SIGNAL PATH 审中-公开在音频信号路径增加动态范围的系统中减少音频作品公开(公告)号：US20150381130A1
公开(公告)日：2015-12-31
申请号：US14467969
申请日：2014-08-25
Applicant: Cirrus Logic, Inc.
Inventor： Tejasvi Das , Ku He , John L. Melanson
CPC classification number: H04R3/02 , H03G3/001 , H03G3/002 , H03G3/3005 , H03G3/3026 , H03M1/70 , H04R2430/01
Abstract: In accordance with embodiments of the present disclosure, an apparatus for providing an output signal to an audio transducer may include a control circuit. The control circuit may be configured to predict, based on a magnitude of a signal indicative of the output signal, an occurrence of an event for changing a selectable digital gain and a selectable analog gain and an audio signal path, and responsive to predicting the occurrence of the event, change, at an approximate time in which a zero crossing of the signal indicative of the output signal occurs, the selectable digital gain and the selectable analog gain.
Abstract translation: 根据本公开的实施例，用于向音频换能器提供输出信号的装置可以包括控制电路。 控制电路可以被配置为基于指示输出信号的信号的大小来预测用于改变可选数字增益和可选择的模拟增益和音频信号路径的事件的发生，并且响应于预测发生 在发生指示输出信号的信号的零交叉的近似时间，可选择的数字增益和可选择的模拟增益之间改变事件。
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