公开(公告)号：US09620101B1

公开(公告)日：2017-04-11

申请号：US14048485

申请日：2013-10-08

申请人： Cirrus Logic, Inc.

发明人： Bharath Kumar Thandri ,  Aniruddha Satoskar ,  Jeffrey D. Alderson ,  John L. Melanson

IPC分类号： G10K11/16

CPC分类号： G10K11/178 ,  G10K11/1785 ,  G10K2210/3212 ,  H02M3/07 ,  H03F1/0222 ,  H03F1/26 ,  H03F3/187 ,  H03F3/72 ,  H03F2200/507

摘要： An audio amplifier circuit may include a power amplifier, a charge pump power supply, and a control circuit. The power amplifier may have an audio input for receiving an audio input signal, an audio output for providing the output signal, and a power supply input. The charge pump power supply may provide a power supply voltage to the power supply input. The charge pump power supply may have a select input for selecting an operating mode of the power supply. In a first operating mode, the power supply voltage may equal to a first voltage, and in a second operating mode, the power supply voltage may be substantially equal to a second voltage which is a rational fraction of the first voltage. The control circuit may generate the select input based on a magnitude of anti-noise generated by an adaptive noise cancellation system associated with the audio transducer.

公开(公告)号：US20150163592A1

公开(公告)日：2015-06-11

申请号：US14101955

申请日：2013-12-10

申请人： Cirrus Logic, Inc.

发明人： Jeffrey D. Alderson

IPC分类号： H04R3/00

CPC分类号： H04R3/002 ,  G10K11/178 ,  G10K11/17854 ,  G10K11/17881 ,  G10K2210/3017 ,  G10K2210/3051 ,  H04R2410/03

摘要： A method may include adaptively generating an anti-noise signal from filtering a reference microphone signal with an adaptive filter in conformity with an error microphone signal and the reference microphone signal. The method may also include adjusting the response of the adaptive filter by combining injected noise with the reference microphone signal and receiving the injected noise by a copy of the adaptive filter so that the response of the copy is controlled by the adaptive filter adapting to cancel a combination of the ambient audio sounds and the injected noise and controlling the response of the adaptive filter with the coefficients adapted in the copy, whereby the injected noise is not present in the anti-noise signal and wherein each of a sample rate of the copy and a rate of adapting of the adaptive filter is significantly less than a sample rate of the adaptive filter.

摘要翻译： 一种方法可以包括自适应地产生抗噪声信号，以使用符合误差麦克风信号和参考麦克风信号的自适应滤波器对参考麦克风信号进行滤波。 该方法还可以包括通过将注入的噪声与参考麦克风信号相结合来调整自适应滤波器的响应，并通过自适应滤波器的副本接收注入的噪声，使得复制的响应由适配滤波器进行控制， 环境音频声音和注入的噪声的组合，并且利用在复制中适应的系数来控制自适应滤波器的响应，由此注入的噪声不存在于抗噪声信号中，并且其中复制和 自适应滤波器的适应率显着小于自适应滤波器的采样率。

公开(公告)号：US09276594B2

公开(公告)日：2016-03-01

申请号：US13840345

申请日：2013-03-15

申请人： Cirrus Logic, Inc.

发明人： Cory Jay Peterson ,  Bhoodev Kumar ,  Daniel John Allen ,  Jeffrey D. Alderson

IPC分类号： H03L7/06 ,  H03L7/10

CPC分类号： H03L7/104

摘要： Noise may be reduced by delaying signal propagation outside of a time window when a change in another signal is expected. A time window may be defined between the change of the first clock signal and the change of the second clock signal during which a third signal, such as a data signal, does not propagate through the circuit. When a change occurs in a third signal after the first clock signal change while the first clock signal is at a different level than a second clock signal, propagation of the third signal change may be delayed until a change in the second clock signal is received. Delayed propagation may be achieved through a latch and hold circuit with no metastability.

摘要翻译： 当预期另一信号的变化时，通过延迟时间窗外的信号传播可以降低噪声。 可以在第一时钟信号的变化和第二时钟信号的变化之间定义时间窗口，在该时间窗口期间诸如数据信号的第三信号不传播通过电路。 当第一时钟信号在第一时钟信号处于与第二时钟信号不同的电平之后，第三信号发生变化时，第三信号改变的传播可被延迟直到接收到第二时钟信号的改变。 可以通过没有亚稳态的锁存和保持电路来实现延迟传播。

公开(公告)号：US20140266337A1

公开(公告)日：2014-09-18

申请号：US13840345

申请日：2013-03-15

申请人： Cirrus Logic, Inc.

发明人： Cory Jay Peterson ,  Bhoodev Kumar ,  Daniel John Allen ,  Jeffrey D. Alderson

IPC分类号： H03L7/10

CPC分类号： H03L7/104

摘要： Noise may be reduced by delaying signal propagation outside of a time window when a change in another signal is expected. A time window may be defined between the change of the first clock signal and the change of the second clock signal during which a third signal, such as a data signal, does not propagate through the circuit. When a change occurs in a third signal after the first clock signal change while the first clock signal is at a different level than a second clock signal, propagation of the third signal change may be delayed until a change in the second clock signal is received. Delayed propagation may be achieved through a latch and hold circuit with no metastability.

摘要翻译： 当预期另一信号的变化时，通过延迟时间窗外的信号传播可以降低噪声。 可以在第一时钟信号的变化和第二时钟信号的变化之间定义时间窗口，在该时间窗口期间诸如数据信号的第三信号不传播通过电路。 当第一时钟信号在第一时钟信号处于与第二时钟信号不同的电平之后，第三信号发生变化时，第三信号改变的传播可被延迟，直到接收到第二时钟信号的改变。 可以通过没有亚稳态的锁存和保持电路来实现延迟传播。

公开(公告)号：US10382864B2

公开(公告)日：2019-08-13

申请号：US14101777

申请日：2013-12-10

申请人： Cirrus Logic, Inc.

发明人： Jeffrey D. Alderson ,  Jon D. Hendrix

IPC分类号： H04R3/04 ,  G10K11/178

摘要： In accordance with systems and methods of the present disclosure, a method may include receiving an error microphone signal indicative of an acoustic output of a transducer and ambient audio sounds at the acoustic output of the transducer. The method may also include generating an anti-noise signal to reduce the presence of the ambient audio sounds at the acoustic output of the transducer based at least on the error microphone signal. The method may further include generating an equalized source audio signal from a source audio signal by adapting, based at least on the error microphone signal, a response of the adaptive playback equalization system to minimize a difference between the source audio signal and the error microphone signal. The method may additionally include combining the anti-noise signal with the equalized source audio signal to generate an audio signal provided to the transducer.

公开(公告)号：US09460701B2

公开(公告)日：2016-10-04

申请号：US13943454

申请日：2013-07-16

申请人： Cirrus Logic, Inc.

发明人： Chin Huang Yong ,  Jeffrey D. Alderson

IPC分类号： A61F11/06 ,  G10K11/16 ,  G10K11/178

CPC分类号： G10K11/16 ,  G10K11/178 ,  G10K11/17817 ,  G10K11/17833 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/1081 ,  G10K2210/3014 ,  G10K2210/3017 ,  G10K2210/3022 ,  G10K2210/3027 ,  G10K2210/30351

摘要： A processing circuit may comprise an adaptive filter having a response generating an anti-noise signal from a reference microphone signal, a secondary path estimate filter modeling an electro-acoustic path of a source audio signal, a biasing portion that generates a scaled anti-noise signal by applying a scaling factor and the response of the secondary path estimate filter to the anti-noise signal, and a coefficient control block that shapes the response of the adaptive filter in conformity with the reference microphone signal and a modified playback corrected error signal by adapting the response of the adaptive filter to minimize ambient audio sounds in the error microphone signal, wherein the playback corrected error is based on a difference between the error microphone signal and the source audio signal and the modified playback corrected error signal is based on a difference between the playback corrected error signal and the scaled anti-noise signal.

摘要翻译： 处理电路可以包括具有从参考麦克风信号产生抗噪声信号的响应的自适应滤波器，对源音频信号的电声路径建模的次路径估计滤波器，产生缩放抗噪声的偏置部分 通过对抗噪声信号应用缩放因子和次路径估计滤波器的响应的信号;以及系数控制块，其根据参考麦克风信号和经修改的重放校正误差信号对自适应滤波器的响应进行整形， 适应自适应滤波器的响应以最小化误差麦克风信号中的环境音频声音，其中重放校正误差基于误差麦克风信号和源音频信号之间的差异，并且经修改的重放校正误差信号基于差 在重放校正误差信号和缩放的抗噪声信号之间。

公开(公告)号：US09066176B2

公开(公告)日：2015-06-23

申请号：US13950854

申请日：2013-07-25

申请人： Cirrus Logic, Inc.

发明人： Jon D. Hendrix ,  Ning Li ,  Jeffrey D. Alderson

IPC分类号： H04R5/033 ,  G10K11/178 ,  H04R1/10

CPC分类号： H04R5/033 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3026 ,  G10K2210/3028 ,  G10K2210/3048 ,  G10K2210/3049 ,  H04R1/1083 ,  H04R2410/05

摘要： In accordance with method and systems of the present disclosure, a processing circuit may implement an adaptive filter having a response that generates the anti-noise signal from the reference microphone signal to reduce the presence of the ambient audio sounds heard by the listener, a coefficient control block that shapes the response of the adaptive filter in conformity with the error microphone signal and the reference microphone signal by adapting the response of the adaptive filter to minimize the ambient audio sounds in the error microphone signal, and a coefficient bias control block which biases coefficients of the coefficient control block towards zero in a range of frequencies outside of a frequency response of the source audio signal.

摘要翻译： 根据本公开的方法和系统，处理电路可以实现具有从参考麦克风信号产生抗噪声信号的响应的自适应滤波器，以减少听众听到的环境音频声音的存在，系数 控制块，其通过调整自适应滤波器的响应来最小化误差麦克风信号中的环境音频声音，使自适应滤波器的响应与误差麦克风信号和参考麦克风信号一致，以及偏差的系数偏置控制块 系数控制块的系数在源音频信号的频率响应之外的频率范围内朝向零。

公开(公告)号：US20140307899A1

公开(公告)日：2014-10-16

申请号：US13950854

申请日：2013-07-25

申请人： Cirrus Logic, Inc.

发明人： Jon D. Hendrix ,  Ning Li ,  Jeffrey D. Alderson

IPC分类号： G10K11/16 ,  H04R5/033

CPC分类号： H04R5/033 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3026 ,  G10K2210/3028 ,  G10K2210/3048 ,  G10K2210/3049 ,  H04R1/1083 ,  H04R2410/05

摘要： In accordance with method and systems of the present disclosure, a processing circuit may implement an adaptive filter having a response that generates the anti-noise signal from the reference microphone signal to reduce the presence of the ambient audio sounds heard by the listener, a coefficient control block that shapes the response of the adaptive filter in conformity with the error microphone signal and the reference microphone signal by adapting the response of the adaptive filter to minimize the ambient audio sounds in the error microphone signal, and a coefficient bias control block which biases coefficients of the coefficient control block towards zero in a range of frequencies outside of a frequency response of the source audio signal.

摘要翻译： 根据本公开的方法和系统，处理电路可以实现具有从参考麦克风信号产生抗噪声信号的响应的自适应滤波器，以减少听众听到的环境音频声音的存在，系数 控制块，其通过调整自适应滤波器的响应来最小化误差麦克风信号中的环境音频声音，使自适应滤波器的响应与误差麦克风信号和参考麦克风信号一致，以及偏差的系数偏置控制块 系数控制块的系数在源音频信号的频率响应之外的频率范围内朝向零。

公开(公告)号：US10219071B2

公开(公告)日：2019-02-26

申请号：US14101955

申请日：2013-12-10

申请人： Cirrus Logic, Inc.

发明人： Jeffrey D. Alderson

IPC分类号： H04R3/00 ,  G10K11/178

摘要： A method may include adaptively generating an anti-noise signal from filtering a reference microphone signal with an adaptive filter in conformity with an error microphone signal and the reference microphone signal. The method may also include adjusting the response of the adaptive filter by combining injected noise with the reference microphone signal and receiving the injected noise by a copy of the adaptive filter so that the response of the copy is controlled by the adaptive filter adapting to cancel a combination of the ambient audio sounds and the injected noise and controlling the response of the adaptive filter with the coefficients adapted in the copy, whereby the injected noise is not present in the anti-noise signal and wherein each of a sample rate of the copy and a rate of adapting of the adaptive filter is significantly less than a sample rate of the adaptive filter.

公开(公告)号：US10181315B2

公开(公告)日：2019-01-15

申请号：US14304208

申请日：2014-06-13

申请人： Cirrus Logic, Inc.

发明人： Jeffrey D. Alderson ,  Jon D. Hendrix ,  Dayong Zhou

IPC分类号： G10K11/178 ,  H04R1/10 ,  H04R3/00 ,  H04R5/033

摘要： In accordance with the present disclosure, an adaptive noise cancellation system may include a controller. The controller may be configured to determine a degree of convergence of an adaptive coefficient control block for controlling an adaptive response of the adaptive noise cancellation system. The controller may enable adaptation of the adaptive coefficient control block if the degree of convergence of the adaptive response is below a particular threshold and disable adaptation of the adaptive coefficient control block if the degree of convergence of the adaptive response is above a particular threshold, such that when the adaptive noise cancellation system is adequately converged, the adaptive noise cancellation system may conserve power by disabling one or more of its components.