公开(公告)号：US08489661B2

公开(公告)日：2013-07-16

申请号：US11610861

申请日：2006-12-14

申请人： John L. Melanson

发明人： John L. Melanson

IPC分类号： G06F17/17 ,  G06F7/38

CPC分类号： H03H17/0283 ,  H03H17/0416 ,  H03H17/0455

摘要： A signal processing system includes a digital sample rate converter to convert a signal sampled at a first sampling frequency into a corresponding signal sampled at a second sampling frequency. In at least one embodiment, the sample rate converter includes a digital sample rate conversion filter. The digital sample rate conversion filter includes a digital filter that models a continuous time filter such as a low pass RC filter and generates filtered samples. The digital sample rate conversion filter also includes an interpolation filter that determines samples between the digital filtered samples. A sample selector selects the samples generated by the interpolation filter at the second sampling frequency. In at least one embodiment, the sample selector determines when to generate interpolated samples and the amount of time offset from an adjacent sample generated by the digital filter.

摘要翻译： 信号处理系统包括数字采样率转换器，用于将以第一采样频率采样的信号转换成以第二采样频率采样的对应信号。 在至少一个实施例中，采样率转换器包括数字采样率转换滤波器。 数字采样率转换滤波器包括一个数字滤波器，用于对诸如低通RC滤波器的连续时间滤波器进行建模，并产生滤波后的样本。 数字采样率转换滤波器还包括一个内插滤波器，用于确定数字滤波样本之间的样本。 采样选择器以第二采样频率选择由内插滤波器生成的采样。 在至少一个实施例中，采样选择器确定何时生成内插采样以及从数字滤波器产生的相邻采样偏移的时间量。

公开(公告)号：US20120308024A1

公开(公告)日：2012-12-06

申请号：US13333484

申请日：2011-12-21

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

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

IPC分类号： G10K11/16

CPC分类号： G10K11/178 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/1082 ,  G10K2210/3017 ,  G10K2210/3028 ,  G10K2210/3035 ,  G10K2210/3049 ,  G10K2210/3056 ,  G10K2210/511

摘要： 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.

摘要翻译： 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：US08248145B2

公开(公告)日：2012-08-21

申请号：US12495457

申请日：2009-06-30

申请人： John L. Melanson

发明人： John L. Melanson

IPC分类号： H03K17/60

CPC分类号： H02M3/158 ,  H03K17/102

摘要： An electronic system includes a low breakdown voltage (LBV) switch internal to an integrated circuit controller to control conductivity of an external, high breakdown voltage (HBV) switch. In at least one embodiment, the internal LBV switch and a cascode configuration of the LBV and HBV switches allow the controller to control the LBV switch and the HBV switch using an internal (“on-chip”) control signal. In at least one embodiment, the LBV switch and the cascode configuration of the HBV switch also allows the controller to control the LBV and HBV switches with more accuracy and less parasitic losses relative to directly controlling the HBV switch. Thus, in at least one embodiment, the low breakdown voltage switch is fabricated as part of an integrated circuit controller, and the high breakdown voltage switch is fabricated separately and located external to the integrated circuit controller.

摘要翻译： 电子系统包括集成电路控制器内部的低击穿电压（LBV）开关，以控制外部高电压（HBV）开关的电导率。 在至少一个实施例中，LBV和HBV开关的内部LBV开关和共源共栅配置允许控制器使用内部（“片上”）控制信号来控制LBV开关和HBV开关。 在至少一个实施例中，HBV开关的LBV开关和共源共栅配置还允许控制器相对于直接控制HBV开关具有更高的精度和更小的寄生损耗来控制LBV和HBV开关。 因此，在至少一个实施例中，低击穿电压开关被制造为集成电路控制器的一部分，并且高击穿电压开关被单独制造并且位于集成电路控制器的外部。

公开(公告)号：US08238576B2

公开(公告)日：2012-08-07

申请号：US11238338

申请日：2005-09-29

申请人： Joel McKee Cooper ,  John L. Melanson ,  Pu Liu

发明人： Joel McKee Cooper ,  John L. Melanson ,  Pu Liu

IPC分类号： H03G5/00

CPC分类号： H04S3/00

摘要： A signal processing system includes a level dependent bass management system. The level dependent bass management system utilizes audio input signal level information to apply at least one of multiple, available bass management solutions to generate one or more output signals from the audio input signal. In at least one embodiment, initially the level dependent bass management system boosts components of the audio input signal in the low frequency range by an amount sufficient to at least partially compensate for low frequency attenuation of the first speaker without exceeding one or more acceptable limitations of the signal processing system. If boosting alone cannot completely compensate for low frequency attenuation of the first speaker without exceeding one or more acceptable limitations of the signal processing system, the level dependent bass management system processes the audio input signal using an alternate low frequency management solution.

摘要翻译： 信号处理系统包括一个依赖于电平的低音管理系统。 电平依赖低音管理系统利用音频输入信号电平信息来应用多个可用低音管理解决方案中的至少一个以从音频输入信号产生一个或多个输出信号。 在至少一个实施例中，电平依赖低音管理系统最初将低频范围内的音频输入信号的分量提升足以至少部分地补偿第一扬声器的低频衰减的量，而不超过一个或多个可接受的限制 信号处理系统。 如果单独升压不能完全补偿第一扬声器的低频衰减，而不超过信号处理系统的一个或多个可接受的限制，则依赖于电平的低音管理系统使用替代的低频管理解决方案处理音频输入信号。

公开(公告)号：US08212493B2

公开(公告)日：2012-07-03

申请号：US12495720

申请日：2009-06-30

申请人： John L. Melanson ,  Mauro L. Gaetano ,  Eric King ,  Robert Grisamore ,  Zhaohui He

发明人： John L. Melanson ,  Mauro L. Gaetano ,  Eric King ,  Robert Grisamore ,  Zhaohui He

IPC分类号： H05B41/36 ,  H02M3/335

CPC分类号： H02M3/3374

摘要： A cascaded power converter having an auxiliary power supply operated from the second switching power stage provides efficient operation by activating the auxiliary power supply early in the startup process. A low energy transfer operating mode is initiated in the second switching power stage to charge the auxiliary power supply output without generating significant disruption at the load. After the first switching power stage is started and the intermediate node voltage has increased to a level sufficient to operate the second switching power stage, the final switching power stage enters a normal operating mode. The low energy transfer operating mode has a substantially reduced switching rate and pulse width from that of the normal operating mode.

摘要翻译： 具有从第二开关功率级操作的辅助电源的级联功率转换器通过在启动过程中提前启动辅助电源来提供有效的操作。 在第二开关功率级中启动低能量传递操作模式以对辅助电源输出进行充电，而不会在负载下产生显着的中断。 在第一开关功率级开始并且中间节点电压已经增加到足以操作第二开关功率级的电平之后，最终开关功率级进入正常工作模式。 低能量转移操作模式与正常操作模式相比具有显着降低的开关速率和脉冲宽度。

公开(公告)号：US08130127B1

公开(公告)日：2012-03-06

申请号：US12827522

申请日：2010-06-30

申请人： Robin Matthew Tsang ,  John Christopher Tucker ,  John L. Melanson

发明人： Robin Matthew Tsang ,  John Christopher Tucker ,  John L. Melanson

IPC分类号： H03M3/00

CPC分类号： H03M3/322 ,  H03M3/452

摘要： A discrete time delta-sigma modulator circuit, which may be used to implement an analog-to-digital converter (ADC) provides improved anti-aliasing performance when lower quantization rates are selected, by maintaining the clocking rate of a first stage in the delta-sigma modulator loop filter at a rate higher than would ordinarily be selected for a lower quantization rate. To accomplish the anti-aliasing improvement, the ratio between the quantization rate and the clocking rate of the first integrator is reduced at the lower quantization rate, resulting in a first true alias image at a multiple of the quantization rate, permitting anti-aliasing filters to more effectively attenuate the alias image, and attenuating the images spaced at the quantization rate via the averaging operation of the first integrator.

摘要翻译： 可用于实现模数转换器（ADC）的离散时间Δ-Σ调制器电路通过将第一级的时钟速率保持在三角形（delta）中来提供较低量化速率时提供的改进的抗混叠性能 Σ调制器环路滤波器的速率高于通常为较低量化速率选择的速率。 为了实现抗锯齿改进，第一积分器的量化速率与时钟速率之间的比例以较低的量化速率降低，从而产生了以量化速率倍数的第一真实混叠图像，从而允许抗混叠滤波器 以更有效地衰减别名图像，并且通过第一积分器的平均化操作来衰减以量化速率间隔的图像。

公开(公告)号：US08120341B2

公开(公告)日：2012-02-21

申请号：US12114130

申请日：2008-05-02

申请人： John L. Melanson

发明人： John L. Melanson

IPC分类号： G05F1/40

CPC分类号： H02M1/4225 ,  H03M3/476 ,  Y02B70/126 ,  Y02P80/112

摘要： A power control system includes a switch mode controller to control the switching mode of a switching power converter. The switch mode controller generates a switch control signal that controls conductivity of a switch of the switching power converter. Controlling conductivity of the switch controls the switch mode of the switching power converter. The switch mode controller includes a period generator to determine a period of the switch control signal and to vary the determined period to generate a broad frequency spectrum of the switch control signal when the determined period corresponds with a frequency in at least a portion of an audible frequency band. Generating a switch control signal with a broad frequency spectrum in the audible frequency band allows the system to utilize switching frequencies in the audible frequency band.

摘要翻译： 功率控制系统包括用于控制开关功率转换器的开关模式的开关模式控制器。 开关模式控制器产生控制开关功率转换器的开关的电导率的开关控制信号。 控制开关电导率控制开关电源转换器的开关模式。 开关模式控制器包括周期发生器，用于确定开关控制信号的周期，并且当所确定的周期对应于可听见的至少一部分中的频率时，改变所确定的周期以产生开关控制信号的宽频谱 频带。 在可听频带中产生具有宽频谱的开关控制信号允许系统利用可听频带中的开关频率。

公开(公告)号：US08009077B1

公开(公告)日：2011-08-30

申请号：US12564182

申请日：2009-09-22

申请人： John L. Melanson

发明人： John L. Melanson

IPC分类号： H03M1/12

CPC分类号： H03M3/368 ,  H03M3/43

摘要： A delta-sigma analog-to-digital converter (ADC) circuit improves performance by reducing the amount of noise and other error sampled by the reference switching circuit. The reference is operated such that one or more reference capacitors remain coupled to an input summing node of the ADC input integrator when an input value to a feedback digital-to-analog converter (DAC) indicates that their contribution is not required to apply a reference in the next quantization period. The reference switching network can select from two or more of the following reference options: 1) switch the reference capacitor to apply a charge quanta as per an ordinary switched-capacitor cycle, 2) switch the reference voltage on a second terminal of the reference capacitor to apply an opposite polarity charge quanta, or 3) leave the first terminal of the reference capacitor coupled to the integrator without changing the voltage at the second terminal of the reference capacitor.

摘要翻译： Δ-Σ模数转换器（ADC）电路通过减少由参考开关电路采样的噪声和其他误差来提高性能。 操作该参考，使得一个或多个参考电容器保持耦合到ADC输入积分器的输入求和节点，当反馈数模转换器（DAC）的输入值指示它们的贡献不需要应用参考 在下一个量化周期。 参考开关网络可以从以下两个或多个参考选项中进行选择：1）根据普通的开关电容器周期切换参考电容器以施加电荷量子; 2）将参考电压切换到参考电容器的第二个端子 以施加相反极性的电荷量子，或3）使参考电容器的第一端子耦合到积分器而不改变参考电容器的第二端子处的电压。

公开(公告)号：US07969125B2

公开(公告)日：2011-06-28

申请号：US11967275

申请日：2007-12-31

申请人： John L. Melanson

发明人： John L. Melanson

IPC分类号： G05F1/00

CPC分类号： H02M1/4225 ,  H03M3/476 ,  Y02B70/126 ,  Y02P80/112

摘要： A power control system includes a switching power converter and a programmable power factor correction (PFC) and output voltage controller. The programmable PFC and output voltage controller generates a control signal to control power factor correction and voltage regulation of the switching power converter. In at least one embodiment, the control signal is a pulse width modulated signal. The programmability of the PFC and output voltage controller provides the programmable PFC and output voltage controller flexibility to operate in accordance with programmable parameters, to adapt to various operating environments, and to respond to various operating exigencies. In at least one embodiment, the programmable PFC and output voltage controller includes a state machine to process one or more programmable, operational parameters to determine the period and pulse width states of the control signal.

摘要翻译： 功率控制系统包括开关功率转换器和可编程功率因数校正（PFC）和输出电压控制器。 可编程PFC和输出电压控制器产生控制信号，以控制开关电源转换器的功率因数校正和电压调节。 在至少一个实施例中，控制信号是脉宽调制信号。 PFC和输出电压控制器的可编程性使可编程PFC和输出电压控制器的灵活性能够根据可编程参数进行操作，以适应各种操作环境，并响应各种操作的紧急情况。 在至少一个实施例中，可编程PFC和输出电压控制器包括处理一个或多个可编程的操作参数以确定控制信号的周期和脉冲宽度状态的状态机。

公开(公告)号：US20110103111A1

公开(公告)日：2011-05-05

申请号：US12986761

申请日：2011-01-07

申请人： John L. Melanson

发明人： John L. Melanson

IPC分类号： H02M7/217

CPC分类号： H02M1/4225 ,  H03M3/476 ,  Y02B70/126 ,  Y02P80/112

摘要： A power control system includes a switching power converter and a controller, and the controller responds to a time-varying voltage source signal by generating a switch control signal having a period that varies in accordance with at least one of the following: (i) the period of the switch control signal trends inversely to estimated power delivered to a load coupled to the switching power converter, (ii) the period of the switch control signal trends inversely to instantaneous voltage levels of the voltage source signal, and (iii) the period of the switch control signal trends directly with a line voltage level of the time-varying voltage source signal. In at least one embodiment, the controller achieves an efficient correlation between the switching period with associated switching losses and the instantaneous power transferred to the switching power converter while providing power factor correction (PFC).

摘要翻译： 功率控制系统包括开关功率转换器和控制器，并且控制器通过产生具有根据以下至少一个而变化的周期的开关控制信号来响应时变电压源信号：（i） 开关控制信号的周期与传送到耦合到开关功率转换器的负载的估计功率成反比，（ii）开关控制信号的周期与电压源信号的瞬时电压电平成反比，以及（iii）周期 的开关控制信号趋势直接与时变电压源信号的线路电压电平。 在至少一个实施例中，控制器在提供功率因数校正（PFC）的同时，在相关的开关损耗的开关周期与传送到开关功率转换器的瞬时功率之间实现有效的相关性。