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公开(公告)号：US09398374B2
公开(公告)日：2016-07-19
申请号：US14457284
申请日：2014-08-12
Applicant: Cirrus Logic, Inc.
Inventor： Khosrow Lashkari , Jie Su
Abstract: In accordance with embodiments of the present disclosure, an audio processing circuit for use in an audio device may perform non-linear acoustic echo cancellation by predicting a displacement associated with an audio speaker, wherein such prediction takes into account a nonlinear response of the audio speaker with a mathematical model that calculates the predicted displacement of the audio speaker as a function of a current signal associated with the audio speaker using a time-varying difference equation, wherein coefficients of the difference equation are based on a set of physical parameters of the audio speaker. From the predicted displacement, the processing circuit may calculate a predicted acoustic output of the audio speaker, which may be used to generate a reference signal to an acoustic echo canceller.
Abstract translation: 根据本公开的实施例，用于音频设备的音频处理电路可以通过预测与音频扬声器相关联的位移来执行非线性声学回声消除，其中这种预测考虑了音频扬声器的非线性响应 使用数学模型，其使用时变差分方程式计算作为与音频扬声器相关联的当前信号的音频扬声器的预测位移，其中差分方程的系数基于音频的一组物理参数 扬声器。 从预测的位移，处理电路可以计算音频扬声器的预测声输出，其可以用于产生到声学回波消除器的参考信号。
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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：US09391517B1
公开(公告)日：2016-07-12
申请号：US14183149
申请日：2014-02-18
Applicant: Cirrus Logic, Inc.
Inventor： Ullas Pazhayaveetil , Michael Kost
CPC classification number: H02M3/158 , G01R21/06 , G01R27/2611 , G06F1/3203 , H02M3/156 , H03F3/187 , H03F3/2175 , H03G3/004
Abstract: Thermal levels in an inductor of a boost converter may be managed by controlling an average current through the inductor. For example, a switching frequency of the boost converter between charging and discharging the inductor may be increased or decreased. Increasing or decreasing the switching frequency results in a corresponding decrease or increase in the switching period for the boost converter. The controller may adjust the switching frequency to control the average current level while maintaining a peak-to-peak current level in the inductor by monitoring the inductance of the inductor and the peak current level in the inductor.
Abstract translation: 可以通过控制通过电感器的平均电流来管理升压转换器的电感器中的热水平。 例如，可以增大或减小升压转换器在充电和放电电感器之间的开关频率。 增加或减少开关频率导致升压转换器的开关周期的相应减小或增加。 控制器可以调节开关频率以控制平均电流电平，同时通过监测电感器的电感和电感器中的峰值电流电平来保持电感器中的峰 - 峰电流电平。
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294.发明申请公开(公告)号：US20160196816A1
公开(公告)日：2016-07-07
申请号：US15070564
申请日：2016-03-15
Applicant: Cirrus Logic, Inc.
Inventor： Dayong Zhou , Yang Lu , Jon D. Hendrix , Jeffrey Alderson , Antonio John Miller , Chin Yong , Gautham Devendra Kamath
IPC: G10K11/175
CPC classification number: G10K11/175 , G10K11/16 , G10K11/178 , G10K2210/00 , G10K2210/108 , G10K2210/3011 , G10K2210/30231 , G10K2210/3028 , G10K2210/30351 , G10K2210/503
Abstract: An adaptive noise canceling (ANC) circuit adaptively generates an anti-noise signal from a reference microphone signal that is injected into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone proximate the speaker provides an error signal. A secondary path estimating adaptive filter estimates the electro-acoustical path from the noise canceling circuit through the transducer so that source audio can be removed from the error signal. Tones in the source audio, such as remote ringtones, present in downlink audio during initiation of a telephone call, are detected by a tone detector using accumulated tone persistence and non-silence hangover counting, and adaptation of the secondary path estimating adaptive filter is halted to prevent adapting to the tones. Adaptation of the adaptive filters is then sequenced so any disruption of the secondary path adaptive filter response is removed before allowing the anti-noise generating filter to adapt.
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公开(公告)号：US09379732B2
公开(公告)日：2016-06-28
申请号：US14845899
申请日：2015-09-04
Applicant: Cirrus Logic, Inc.
Inventor： John L. Melanson , Stephen T. Hodapp
Abstract: Requirements placed on the first integrator of a filter in a continuous-time delta-feedback modulator may be reduced by using circuitry to reduce the speed of a signal provided to the first integrator of the modulator. The reduction in speed applied to the signal received at the first integrator may then be compensated with circuitry elsewhere in the modulator, such that the net effect of the slow down and speed up of signals does not affect the output of the modulator. The sigma-delta modulator may be implemented in converters, such as an analog-to-digital converter (ADC).
Abstract translation: 通过使用电路来降低提供给调制器的第一积分器的信号的速度，可以减少在连续时间增量反馈调制器中对滤波器的第一积分器的要求。 然后可以利用在调制器其他地方的电路补偿施加到在第一积分器处接收的信号的速度的降低，使得信号的减速和加速的净效应不影响调制器的输出。 Σ-Δ调制器可以在诸如模数转换器（ADC）的转换器中实现。
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Patent Agency Ranking
296.发明授权Internal dynamic range control in an adaptive noise cancellation (ANC) system 有权自适应噪声消除（ANC）系统中的内部动态范围控制公开(公告)号：US09369798B1
公开(公告)日：2016-06-14
申请号：US13794979
申请日：2013-03-12
Applicant: Cirrus Logic, Inc.
Inventor： Jeffrey Alderson , Jon D. Hendrix , Gautham Devendra Kamath
CPC classification number: H04R3/002 , G10K11/178 , G10K11/17854 , G10K11/17881 , G10K11/17885 , G10K2210/1081 , G10K2210/3028 , G10K2210/3051 , H04R1/1083 , H04R2410/05 , H04R2460/01
Abstract: A personal audio device, such as a headphone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal using one or more microphone signals that measure the ambient audio. The anti-noise signal is combined with source audio to provide an output for a speaker. The anti-noise signal causes cancellation of ambient audio sounds that appear in the microphone signals. A processing circuit uses the reference microphone to generate the anti-noise signal using one or more adaptive filters. The processing circuit also includes low-pass filters that remove quantization noise images at the output of the adaptive filter to reduce the dynamic range required at the output of the adaptive filter.
Abstract translation: 诸如耳机的个人音频设备包括使用测量环境音频的一个或多个麦克风信号自适应地生成抗噪声信号的自适应噪声消除（ANC）电路。 抗噪声信号与源音频相结合，为扬声器提供输出。 抗噪声信号会导致消除麦克风信号中出现的环境音频声音。 处理电路使用参考麦克风使用一个或多个自适应滤波器产生抗噪声信号。 处理电路还包括低通滤波器，其在自适应滤波器的输出处去除量化噪声图像，以减少在自适应滤波器的输出处所需的动态范围。
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297.发明授权公开(公告)号：US09368099B2
公开(公告)日：2016-06-14
申请号：US14228322
申请日：2014-03-28
Applicant: Cirrus Logic, Inc.
Inventor： Jeffrey Alderson , Nitin Kwatra , Gautham Devendra Kamath , Ali Abdollahzadeh Milani , John L. Melanson
IPC: G10K11/16 , G10K11/178
CPC classification number: G10K11/178 , G10K2210/108 , G10K2210/1081 , G10K2210/1082 , G10K2210/3017 , G10K2210/3028 , G10K2210/3035 , G10K2210/3049 , G10K2210/3056 , G10K2210/511
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 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. A processing circuit that performs the adaptive noise canceling (ANC) function also either adjusts the frequency response of the anti-noise signal with respect to the reference microphone signal, and/or by adjusting the response of the adaptive filter independent of the adaptation provided by the reference microphone signal.
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公开(公告)号：US20160126908A1
公开(公告)日：2016-05-05
申请号：US14840894
申请日：2015-08-31
Applicant: Cirrus Logic, Inc.
Inventor： Eric J. King , Christophe J. Amadi , John L. Melanson
IPC: H03F3/217
CPC classification number: H03F3/2175 , H03F1/0277 , H03F1/083 , H03F3/181 , H03F3/185 , H03F3/217 , H03F3/2171 , H03F3/2173 , H03F3/2178 , H03F2200/03 , H03F2200/231
Abstract: A method for producing an output voltage to a load may include, in a power stage comprising power converter having a power inductor, a plurality of switches arranged to sequentially operate in a plurality of switch configurations, and an output for producing the output voltage comprising a first output terminal and a second output terminal, controlling the linear amplifier to transfer electrical energy from the input source of the power stage to the load in accordance with one or more least significant bits of a digital input signal, and controlling the power converter in accordance with bits of the digital input signal other than the one or more least significant bits to sequentially apply switch configurations from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to transfer electrical energy from the input source of the power stage to the load.
Abstract translation: 用于向负载产生输出电压的方法可以包括在包括具有功率电感器的功率转换器的功率级中，布置成以多个开关配置顺序工作的多个开关，以及用于产生包括 第一输出端和第二输出端，控制线性放大器根据数字输入信号的一个或多个最低有效位将电能从功率级的输入源传输到负载，并根据 其中所述数字输入信号的位与所述一个或多个最低有效位不同，以顺序地施加来自所述多个开关配置的开关配置以选择性地激活或去激活所述多个开关中的每一个，以便从所述多个开关的输入源 功率级到负载。
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299.发明授权Sidetone management in an adaptive noise canceling (ANC) system including secondary path modeling 有权自适应噪声消除（ANC）系统中的侧音管理包括二次路径建模公开(公告)号：US09325821B1
公开(公告)日：2016-04-26
申请号：US13686353
申请日：2012-11-27
Applicant: Cirrus Logic, Inc.
Inventor： Jon D. Hendrix , Ali Abdollahzadeh Milani
CPC classification number: H04M1/03 , G10K11/175 , G10K11/178 , G10K11/17825 , G10K11/17854 , G10K11/17881 , G10K2210/108 , G10K2210/30231 , G10K2210/30391 , G10K2210/503 , H04R29/00
Abstract: A wireless telephone includes an adaptive noise canceling (ANC) 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 is also provided proximate the speaker to provide an error signal indicative of the effectiveness of the noise cancellation. A secondary path estimating adaptive filter is used to estimate the electro-acoustical path from the noise canceling circuit through the transducer so that source audio can be removed from the error signal. Sidetone is injected into the transducer output, but is not provided to the coefficient control of the secondary path estimating adaptive filter, so that the ambient noise present in the near-end speech microphone signal, and thus present in the sidetone information, does not destabilize the ANC circuit or otherwise cause improper generation of the anti-noise signal.
Abstract translation: 无线电话包括自适应噪声消除（ANC）电路，其自适应地从参考麦克风信号产生抗噪声信号，并将抗噪声信号注入到扬声器或其他换能器输出中以引起环境声音的消除。 在扬声器附近还提供误差麦克风以提供指示噪声消除的有效性的误差信号。 二次路径估计自适应滤波器用于估计通过换能器的噪声消除电路的电声路径，从而可以从误差信号中去除源音频。 侧耳被注入到换能器输出中，但不提供给二次路径估计自适应滤波器的系数控制，使得近端话音麦克风信号中存在的环境噪声因而存在于侧音信息中并不破坏稳定 ANC电路或其他原因造成不正确的抗噪声信号产生。
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300.发明授权公开(公告)号：US09325434B2
公开(公告)日：2016-04-26
申请号：US14276237
申请日：2014-05-13
Applicant: Cirrus Logic, Inc.
Inventor： John L. Melanson , John C. Tucker
CPC classification number: H04B15/04 , G05B15/02 , G05F1/14 , G06F1/08 , G06F3/165 , H04B2215/067 , H04B2215/068
Abstract: A mobile device may include a digital data driver and digital data receiver for communication of digital signals within the mobile device at a selected clock rate. The mobile device may also have a device external for the digital data driver and digital data receiver for communication of external signals, such as radio-frequency signals, to and from the mobile device. To avoid interference of frequency harmonics of a digital signal with such external signals, the digital data driver may be configured to control the digital signal based on the frequency of the external signals, such that interference of the external signal by spectral content of the digital signal is minimized, while maintaining the selected clock rate.
Abstract translation: 移动设备可以包括数字数据驱动器和数字数据接收器，用于以选定的时钟速率在移动设备内通信数字信号。 移动设备还可以具有用于数字数据驱动器的外部设备和数字数据接收器，用于将外部信号（例如射频信号）传送到移动设备和从移动设备通信。 为了避免数字信号与这种外部信号的频率谐波的干扰，数字数据驱动器可以被配置为基于外部信号的频率来控制数字信号，使得通过数字信号的频谱内容对外部信号的干扰 同时保持选定的时钟频率。
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