公开(公告)号：US09076431B2

公开(公告)日：2015-07-07

申请号：US13436828

申请日：2012-03-30

Applicant: Gautham Devendra Kamath ,  Jon D. Hendrix

Inventor： Gautham Devendra Kamath ,  Jon D. Hendrix

IPC: A61F11/06 ,  G10K11/16 ,  H03B29/00 ,  H03B15/00 ,  G10K11/178

CPC classification number: G10K11/1784 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/3017 ,  G10K2210/3028 ,  G10K2210/30391 ,  G10K2210/3045 ,  G10K2210/503

Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cancel ambient audio sounds. A processing circuit implements one or more adaptive filters that control the generation of the anti-noise signal. At least one of the adaptive filters is partitioned into a first portion having a fixed frequency response and a second portion having a variable frequency response. The partitioned filter may be an adaptive filter that generates the anti-noise signal directly from the reference microphone signal. An error microphone may be provided to measure the ambient sounds and transducer output near the transducer, and a secondary path adaptive filter included to generate an error signal from the error microphone signal, which may be partitioned, alone or in combination.

Abstract translation: 诸如无线电话的个人音频设备包括自适应噪声消除（ANC）电路，其从参考麦克风信号产生抗噪声信号，并将抗噪声信号注入扬声器或其他换能器输出以消除环境声音 声音 处理电路实现一个或多个自适应滤波器，其控制抗噪声信号的产生。 自适应滤波器中的至少一个被分割成具有固定频率响应的第一部分和具有可变频率响应的第二部分。 分割滤波器可以是自适应滤波器，其直接从参考麦克风信号产生抗噪声信号。 可以提供误差麦克风来测量换能器附近的环境声音和换能器输出，以及包括的二次路径自适应滤波器，用于从误差麦克风信号中产生可单独或组合的误差信号。

公开(公告)号：US08948407B2

公开(公告)日：2015-02-03

申请号：US13333484

申请日：2011-12-21

Applicant: Jeffrey Alderson ,  Nitin Kwatra ,  Gautham Devendra Kamath ,  Ali Abdollahzadeh Milani ,  John L. Melanson

Inventor： Jeffrey Alderson ,  Nitin Kwatra ,  Gautham Devendra Kamath ,  Ali Abdollahzadeh Milani ,  John L. Melanson

IPC: A61F11/06 ,  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.

Abstract translation: 诸如无线电话的个人音频设备包括噪声消除电路，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它换能器输出中以引起环境音频声音的消除。 还可以在扬声器附近提供误差麦克风以测量换能器的输出，以便控制抗噪声信号的适应性并且估计通过换能器的噪声消除电路的电声路径。 执行自适应噪声消除（ANC）功能的处理电路还可以相对于参考麦克风信号调整抗噪声信号的频率响应，和/或通过调节独立于由 参考麦克风信号。

公开(公告)号：US08908877B2

公开(公告)日：2014-12-09

申请号：US13310380

申请日：2011-12-02

Applicant: Ali Abdollahzadeh Milani ,  Gautham Devendra Kamath

Inventor： Ali Abdollahzadeh Milani ,  Gautham Devendra Kamath

IPC: A61F11/06 ,  G10K11/178

CPC classification number: G10K11/175 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/3039 ,  G10K2210/3055 ,  G10K2210/503

Abstract: A personal audio device, such as 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 estimate an electro-acoustical path from the noise canceling circuit through the transducer. A processing circuit determines a degree of coupling between the user's ear and the transducer and adjusts the adaptive cancellation of the ambient sounds to prevent erroneous and possibly disruptive generation of the anti-noise signal if the degree of coupling lies either below or above a range of normal operating ear contact pressure.

Abstract translation: 诸如无线电话的个人音频设备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扬声器或其他换能器输出以引起取消 的环境音频声音。 在扬声器附近还设置误差麦克风，以估计从噪声消除电路通过换能器的电声路径。 处理电路确定用户的耳朵和换能器之间的耦合程度，并调整环境声音的自适应消除，以防止如果耦合度低于或高于一个范围的抗噪声信号的错误和可能的破坏性产生 正常操作耳朵接触压力。

公开(公告)号：US08452429B2

公开(公告)日：2013-05-28

申请号：US12412936

申请日：2009-03-27

Applicant: Gautham Devendra Kamath ,  Jeff W. Baumgartner ,  John Christopher Tucker

Inventor： Gautham Devendra Kamath ,  Jeff W. Baumgartner ,  John Christopher Tucker

IPC: G06F17/00

CPC classification number: G06F17/00 ,  H03H17/0628 ,  H03L1/02

Abstract: An integrated circuit audio processor having an internal-oscillator generated intermediate frequency reference provides for operation of an audio processor without requiring an external master clock. Input audio streams are sample-rate converted to an intermediate sample rate derived from the internal oscillator, which may be an LC oscillator. One or more output audio streams are generated from the one or more input audio streams at the intermediate sample rate and are converted from the intermediate sample rate to corresponding output sample rates. A divider generates the intermediate sample rate from the oscillator output, and is programmed to control the intermediate sample rate to ensure that the intermediate sample rate is in the proper range for operation of the integrated circuit. The divider can be programmed to accommodate changes in process, voltage and/or temperature of the IC, so that the intermediate sample rate is maintained near an expected frequency.

Abstract translation: 具有内部振荡器产生的中频参考的集成电路音频处理器提供音频处理器的操作而不需要外部主时钟。 输入音频流被采样率转换成从内部振荡器得到的中间采样速率，内部振荡器可以是LC振荡器。 从中间采样率的一个或多个输入音频流产生一个或多个输出音频流，并从中间采样率转换为对应的输出采样率。 分压器从振荡器输出产生中间采样率，并且被编程为控制中间采样率，以确保中间采样率在集成电路的操作的适当范围内。 分频器可以被编程以适应IC的过程，电压和/或温度的变化，使得中间采样率保持在预期频率附近。

公开(公告)号：US20120308024A1

公开(公告)日：2012-12-06

申请号：US13333484

申请日：2011-12-21

Applicant: Jeffrey Alderson ,  Nitin Kwatra ,  Gautham Devendra Kamath ,  Ali Abdollahzaden Milani ,  John L. Melanson

Inventor： Jeffrey Alderson ,  Nitin Kwatra ,  Gautham Devendra Kamath ,  Ali Abdollahzaden Milani ,  John L. Melanson

IPC: G10K11/16

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.

Abstract translation: 诸如无线电话的个人音频设备包括噪声消除电路，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它换能器输出中以引起环境音频声音的消除。 还可以在扬声器附近提供误差麦克风以测量换能器的输出，以便控制抗噪声信号的适应性并且估计通过换能器的噪声消除电路的电声路径。 执行自适应噪声消除（ANC）功能的处理电路还可以相对于参考麦克风信号调整抗噪声信号的频率响应，和/或通过调节独立于由 参考麦克风信号。

公开(公告)号：US20120207317A1

公开(公告)日：2012-08-16

申请号：US13310380

申请日：2011-12-02

Applicant: Ali Abdollahzadeh Milani ,  Gautham Devendra Kamath

Inventor： Ali Abdollahzadeh Milani ,  Gautham Devendra Kamath

IPC: H03B29/00

CPC classification number: G10K11/175 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/3039 ,  G10K2210/3055 ,  G10K2210/503

Abstract: A personal audio device, such as 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 estimate an electro-acoustical path from the noise canceling circuit through the transducer. A processing circuit determines a degree of coupling between the user's ear and the transducer and adjusts the adaptive cancellation of the ambient sounds to prevent erroneous and possibly disruptive generation of the anti-noise signal if the degree of coupling lies either below or above a range of normal operating ear contact pressure.

Abstract translation: 诸如无线电话的个人音频设备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扬声器或其他换能器输出以引起取消 的环境音频声音。 在扬声器附近还设置误差麦克风，以估计从噪声消除电路通过换能器的电声路径。 处理电路确定用户的耳朵和换能器之间的耦合程度，并调整环境声音的自适应消除，以防止如果耦合度低于或高于一个范围的抗噪声信号的错误和可能的破坏性产生 正常操作耳朵接触压力。

公开(公告)号：US07733119B1

公开(公告)日：2010-06-08

申请号：US11478707

申请日：2006-06-30

Applicant: Gautham Devendra Kamath

Inventor： Gautham Devendra Kamath

IPC: H03K17/16

CPC classification number: F17C13/002 ,  F17C13/005 ,  H03K19/1733

Abstract: Programming circuitry 200 includes a terminal 202 for coupling to a resistor having a resistance representing a corresponding programming state. Current control circuitry 204/205 selectively passes at least one exponentially weighted current through terminal 202. Detection Circuitry 201 then determines the resistance of the resistor from the at least one exponentially weighted current to determine the programming state.

Abstract translation: 编程电路200包括用于耦合到具有表示相应编程状态的电阻的电阻器的端子202。 电流控制电路204/205选择性地将至少一个指数加权的电流通过端子202.检测电路201然后从至少一个指数加权电流确定电阻器的电阻以确定编程状态。

公开(公告)号：US07557661B1

公开(公告)日：2009-07-07

申请号：US11618784

申请日：2006-12-30

Applicant: John L. Melanson ,  Gautham Devendra Kamath

Inventor： John L. Melanson ,  Gautham Devendra Kamath

IPC: H03B1/00 ,  H03L7/06 ,  H03D3/18

CPC classification number: H03L7/1976 ,  H03L7/07

Abstract: A direct digital synthesis (DDS) hybrid phase-lock loop for low-jitter synchronization provides a mechanism for generating a low-jitter clock from a timing reference that has a high jitter level. A DDS circuit provides a clock output and has an input for receiving a rational number. The rational number represents a ratio between the frequency of the clock output and the frequency of another stable clock provided to the circuit. In one implementation, a phase output of the DDS circuit is compared to a phase determined from an incoming timing reference and in another implementation, the low-jitter clock output is utilized to generate a phase number via a counter that is clocked by the clock output and captured by the timing reference.

Abstract translation: 用于低抖动同步的直接数字综合（DDS）混合锁相环提供了一种用于从具有高抖动电平的定时参考产生低抖动时钟的机制。 DDS电路提供时钟输出，并具有用于接收有理数的输入。 有理数表示时钟输出的频率与提供给电路的另一个稳定时钟的频率之间的比率。 在一个实现中，将DDS电路的相位输出与从输入定时参考确定的相位进行比较，在另一实现中，低抖动时钟输出用于经由计时器产生相位数，计数器由时钟输出 并由定时参考捕获。

公开(公告)号：US08643340B1

公开(公告)日：2014-02-04

申请号：US12569549

申请日：2009-09-29

Applicant: Gautham Devendra Kamath

Inventor： Gautham Devendra Kamath

IPC: H02J7/00

CPC classification number: H02J7/345 ,  H02J7/0024 ,  H02M3/07 ,  H02M2001/0032 ,  Y02B70/16

Abstract: An integrated circuit (IC) having an internal power supply voltage step down circuit provides efficiency while requiring a minimum of external terminals. In a first operating mode, a storage capacitor is charged from the power supply return of a group of circuits, while the group of circuits is powered from an input power supply voltage provided to the IC. In a second operating mode, the group of circuits is powered from the storage capacitor. The step-down circuit provides for halving the input power supply voltage, but multiple storage capacitors and additional operating modes can be provided for voltage division by greater factors. A sensing circuit can be employed to sense the voltage across the storage capacitor(s) and in response, select the operating mode, providing hysteretic control of the voltage supplied to the group of circuits.

Abstract translation: 具有内部电源电压降压电路的集成电路（IC）提供效率，同时需要最小的外部端子。 在第一操作模式中，从一组电路的电源返回器中充电存储电容器，同时该组电路由提供给IC的输入电源电压供电。 在第二操作模式中，该组电路由存储电容器供电。 降压电路提供输入电源电压的一半，但是可以通过更多的因素提供多个存储电容器和额外的工作模式来进行分压。 可以使用感测电路来感测存储电容器两端的电压，并且作为响应，选择操作模式，对提供给该组电路的电压提供迟滞控制。

公开(公告)号：US20120308026A1

公开(公告)日：2012-12-06

申请号：US13436828

申请日：2012-03-30

Applicant: Gautham Devendra Kamath ,  Jon D. Hendrix

Inventor： Gautham Devendra Kamath ,  Jon D. Hendrix

IPC: G10K11/16

CPC classification number: G10K11/1784 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/3017 ,  G10K2210/3028 ,  G10K2210/30391 ,  G10K2210/3045 ,  G10K2210/503

Abstract: A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cancel ambient audio sounds. A processing circuit implements one or more adaptive filters that control the generation of the anti-noise signal. At least one of the adaptive filters is partitioned into a first portion having a fixed frequency response and a second portion having a variable frequency response. The partitioned filter may be an adaptive filter that generates the anti-noise signal directly from the reference microphone signal. An error microphone may be provided to measure the ambient sounds and transducer output near the transducer, and a secondary path adaptive filter included to generate an error signal from the error microphone signal, which may be partitioned, alone or in combination.

Abstract translation: 诸如无线电话的个人音频设备包括自适应噪声消除（ANC）电路，其从参考麦克风信号产生抗噪声信号，并将抗噪声信号注入扬声器或其他换能器输出以消除环境声音 声音 处理电路实现一个或多个自适应滤波器，其控制抗噪声信号的产生。 自适应滤波器中的至少一个被分割成具有固定频率响应的第一部分和具有可变频率响应的第二部分。 分割滤波器可以是自适应滤波器，其直接从参考麦克风信号产生抗噪声信号。 可以提供误差麦克风来测量换能器附近的环境声音和换能器输出，以及包括的二次路径自适应滤波器，用于从误差麦克风信号中产生可单独或组合的误差信号。