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11.再颁专利Systems and methods for implementing a sample rate converter using hardware and software to maximize speed and flexibility 有权使用硬件和软件实现采样率转换器的系统和方法，以最大限度地提高速度和灵活性公开(公告)号：USRE43489E1
公开(公告)日：2012-06-26
申请号：US12359021
申请日：2009-01-23
申请人： Jack B. Andersen , Larry E. Hand , Daniel L. W. Chieng , Joel W. Page , Wilson E. Taylor , Tonya Andersen
发明人： Jack B. Andersen , Larry E. Hand , Daniel L. W. Chieng , Joel W. Page , Wilson E. Taylor , Tonya Andersen
IPC分类号： H03M7/00
CPC分类号： H03H17/0621 , H03H2218/06
摘要： Systems and methods for converting a digital input data stream from a first sample rate to a second, fixed sample rate using a combination of hardware and software components. In one embodiment, a system includes a rate estimator configured to estimate the sample rate of an input data stream, a phase selection unit configured to select a phase for interpolation of a set of polyphase filter coefficients based on the estimated sample rate, a coefficient interpolator configured to interpolate the filter coefficients based on the selected phase, and a convolution unit configured to convolve the interpolated filter coefficients with samples of the input data stream to produce samples of a re-sampled output data stream. One or more hardware or software components are shared between multiple channels that can process data streams having independently variable sample rates.
摘要翻译： 用于使用硬件和软件组件的组合将数字输入数据流从第一采样率转换为第二固定采样率的系统和方法。 在一个实施例中，系统包括：速率估计器，被配置为估计输入数据流的采样率;相位选择单元，被配置为基于所估计的采样率来选择用于内插多相滤波器系数的相位;系数内插器 被配置为基于所选择的相位内插所述滤波器系数;以及卷积单元，其被配置为将所述内插滤波器系数与所述输入数据流的采样进行卷积，以产生重新采样的输出数据流的采样。 一个或多个硬件或软件组件在可以处理具有独立可变采样率的数据流的多个通道之间共享。
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公开(公告)号：US07518444B2
公开(公告)日：2009-04-14
申请号：US11672191
申请日：2007-02-07
IPC分类号： H03F3/38
CPC分类号： H03F3/2171 , H03F1/32 , H03F1/52 , H03F1/523 , H03F3/2175 , H03F2200/03 , H03F2200/153 , H03F2200/351
摘要： Systems and methods for improving the stability of feedback and/or feed-forward subsystems in digital amplifiers. One embodiment comprises a digital pulse width modulation (PWM) controller. The controller includes an input for receiving a digital audio input signal and is configured to generate a PWM output signal based on the input signal at an output. The controller also has control inputs for receiving external audio correction signals such as feedback and power supply feed-forward signals. The controller has correction circuitry for processing the received external control signals and modifying the input signal based on these signals. Fault detectors monitor fault conditions at various locations within the correction circuitry, and a protection control unit receives fault signals from the fault detectors and modifies operation of the controller in response to the fault signals.
摘要翻译： 用于提高数字放大器中反馈和/或前馈子系统稳定性的系统和方法。 一个实施例包括数字脉宽调制（PWM）控制器。 控制器包括用于接收数字音频输入信号的输入端，并且被配置为基于输出端的输入信号产生PWM输出信号。 控制器还具有用于接收外部音频校正信号（如反馈和电源前馈信号）的控制输入。 该控制器具有校正电路，用于处理所接收的外部控制信号，并根据这些信号修改输入信号。 故障检测器监视校正电路内的各个位置的故障状况，保护控制单元从故障检测器接收故障信号，并根据故障信号修改控制器的操作。
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公开(公告)号：US20090027118A1
公开(公告)日：2009-01-29
申请号：US11782708
申请日：2007-07-25
申请人： Jack B. Andersen , Peter Craven , Michael A. Kost , Daniel L.W. Chieng , Larry E. Hand , Wilson E. Taylor
发明人： Jack B. Andersen , Peter Craven , Michael A. Kost , Daniel L.W. Chieng , Larry E. Hand , Wilson E. Taylor
CPC分类号： H03F3/217
摘要： Systems and methods for performance improvements in digital switching amplifiers using a low delay corrector. In one embodiment, a digital pulse width modulation (PWM) amplifier includes a signal processing plant configured to receive and process an input audio signal. The amplifier also includes a low delay corrector configured to receive signals output by the plant. The output of the low delay corrector is added to the input audio signal as feedback. The plant may consist of a modulator and power switch, a noise shaper, or any other type of plant. An analog-to-digital converter (ADC) may be provided to convert the output audio signal to a digital signal. Filtering may be implemented before or after the ADC, and a decimator may be placed after the ADC if it is an oversampling ADC.
摘要翻译： 使用低延迟校正器的数字开关放大器性能改进的系统和方法。 在一个实施例中，数字脉宽调制（PWM）放大器包括被配置为接收和处理输入音频信号的信号处理设备。 放大器还包括低延迟校正器，其被配置为接收由工厂输出的信号。 低延迟校正器的输出作为反馈被添加到输入音频信号。 该设备可以由调制器和电源开关，噪声整形器或任何其它类型的设备组成。 可以提供模数转换器（ADC）以将输出音频信号转换为数字信号。 可以在ADC之前或之后实现滤波，如果ADC是过采样ADC，则可以在ADC之后放置抽取器。
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14.发明授权Systems and methods for correcting errors resulting from component mismatch in a feedback path 有权用于校正由反馈路径中的组件不匹配引起的错误的系统和方法公开(公告)号：US07482865B2
公开(公告)日：2009-01-27
申请号：US11672331
申请日：2007-02-07
IPC分类号： H03F3/38
CPC分类号： H03F3/2173 , H03F1/30 , H03F1/34 , H03F2200/03 , H03F2200/351
摘要： Systems and methods for minimizing performance degradation due to component mismatch in the feedback path of a digital PWM amplifier feedback loop. One embodiment comprises a digital pulse width modulated (PWM) amplifier with feedback. The amplification subsystem receives a digital audio signal and produces an analog output signal. The feedback loop produces a feedback signal based on the filtered analog output signal and modifies the digital audio signal based on the feedback signal. The feedback loop includes a filter configured to filter the analog output signal and correction circuitry configured to correct component mismatch errors introduced by the filter. In one embodiment, the correction circuitry receives a measurement of a power supply voltage, multiplies the measured voltage by a gain and adds the scaled measurement to the feedback signal to correct for the component mismatch errors.
摘要翻译： 用于使数字PWM放大器反馈回路的反馈路径中的组件不匹配导致性能下降最小化的系统和方法。 一个实施例包括具有反馈的数字脉宽调制（PWM）放大器。 放大子系统接收数字音频信号并产生模拟输出信号。 反馈回路基于滤波的模拟输出信号产生反馈信号，并且基于反馈信号修改数字音频信号。 反馈回路包括被配置为过滤模拟输出信号的滤波器和被配置为校正由滤波器引入的元件失配误差的校正电路。 在一个实施例中，校正电路接收电源电压的测量，将测量的电压乘以增益，并将缩放的测量值加到反馈信号上，以校正组件失配误差。
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15.发明申请Systems and Methods for Correcting Errors Resulting from Component Mismatch in a Feedback Path 有权用于纠正由反馈路径中的组件不匹配引起的错误的系统和方法公开(公告)号：US20080278230A1
公开(公告)日：2008-11-13
申请号：US11672331
申请日：2007-02-07
IPC分类号： H03F3/38
CPC分类号： H03F3/2173 , H03F1/30 , H03F1/34 , H03F2200/03 , H03F2200/351
摘要： Systems and methods for minimizing performance degradation due to component mismatch in the feedback path of a digital PWM amplifier feedback loop. One embodiment comprises a digital pulse width modulated (PWM) amplifier with feedback. The amplification subsystem receives a digital audio signal and produces an analog output signal. The feedback loop produces a feedback signal based on the filtered analog output signal and modifies the digital audio signal based on the feedback signal. The feedback loop includes a filter configured to filter the analog output signal and correction circuitry configured to correct component mismatch errors introduced by the filter. In one embodiment, the correction circuitry receives a measurement of a power supply voltage, multiplies the measured voltage by a gain and adds the scaled measurement to the feedback signal to correct for the component mismatch errors.
摘要翻译： 用于使数字PWM放大器反馈回路的反馈路径中的组件不匹配导致性能下降最小化的系统和方法。 一个实施例包括具有反馈的数字脉宽调制（PWM）放大器。 放大子系统接收数字音频信号并产生模拟输出信号。 反馈回路基于滤波的模拟输出信号产生反馈信号，并且基于反馈信号修改数字音频信号。 反馈回路包括被配置为过滤模拟输出信号的滤波器和被配置为校正由滤波器引入的元件失配误差的校正电路。 在一个实施例中，校正电路接收电源电压的测量，将测量的电压乘以增益，并将缩放的测量值加到反馈信号上，以校正组件失配误差。
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16.发明授权Apparatus and method for safely handling asychronous shutdown of pulsewidth modulated output 有权用于安全处理脉冲宽度调制输出的异步关断的装置和方法公开(公告)号：US06925115B1
公开(公告)日：2005-08-02
申请号：US10328281
申请日：2002-12-23
申请人： Jack B. Andersen , Wasim Quddus
发明人： Jack B. Andersen , Wasim Quddus
CPC分类号： H03F3/217 , H03F1/52 , H03F2200/03 , H03F2200/331 , H03F2200/351
摘要： An apparatus and method for safely handling asynchronous shutdown of pulsewidth modulated output. A shutdown circuit controls asynchronous shutdown of a pulsewidth modulated stage to ensure that pulsewidth modulated signals of less duration than a minimum period does not occur at transition edges of the pulsewidth modulated signal, in which such short pulses may affect the proper operation of output circuitry.
摘要翻译： 一种用于安全处理脉宽调制输出的异步关断的装置和方法。 关断电路控制脉冲宽度调制级的异步关断，以确保在脉冲宽度调制信号的过渡边缘处不发生比最小周期更短持续时间的脉宽调制信号，其中这样的短脉冲可能影响输出电路的正常操作。
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17.发明授权Systems and methods for switching and mixing signals in a multi-channel amplifier 有权用于在多通道放大器中切换和混合信号的系统和方法公开(公告)号：US07929718B1
公开(公告)日：2011-04-19
申请号：US10843852
申请日：2004-05-12
摘要： Systems and methods for scaling the number of output channels that can be provided in an audio amplification system. In one embodiment, a digital pulse width modulation (PWM) amplification system includes multiple four-channel PWM controller chips that are interconnected to enable synchronization and transfer of digital audio data from one chip to another. Input audio signals received by each of the channels are processed by sample rate converters to generate internal audio signals that have a predetermined sample rate and format. Each of the channels is synchronized so that the internal audio signal of each channel can be processed and output by any of the other channels. The PWM controller chips are connected by a high-speed interconnect that enables the transfer of data between them. Each input audio signal can be mapped to any of the outputs and can be mixed with other input signals.
摘要翻译： 用于缩放可在音频放大系统中提供的输出通道数量的系统和方法。 在一个实施例中，数字脉宽调制（PWM）放大系统包括互连的多个四通道PWM控制器芯片，以实现数字音频数据从一个芯片到另一个芯片的同步和传输。 由每个通道接收的输入音频信号由采样率转换器处理以产生具有预定采样率和格式的内部音频信号。 每个通道被同步，使得每个通道的内部音频信号可以被任何其他通道处理和输出。 PWM控制器芯片通过高速互连连接，可以在它们之间传输数据。 每个输入音频信号可以映射到任何一个输出，并且可以与其他输入信号混合。
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公开(公告)号：US07812666B2
公开(公告)日：2010-10-12
申请号：US12542634
申请日：2009-08-17
申请人： Daniel L. W. Chieng , Peter G. Craven , Michael A. Kost , Jack B. Andersen , Larry E. Hand , Wilson E. Taylor
发明人： Daniel L. W. Chieng , Peter G. Craven , Michael A. Kost , Jack B. Andersen , Larry E. Hand , Wilson E. Taylor
IPC分类号： H03F3/68
CPC分类号： H03F3/217
摘要： A low delay corrector (LDC) unit includes a non-linear function generator and a filter. The nonlinear function generator receives a first signal and outputs a second signal in dependence on the first signal and a transfer function of the nonlinear function generator. The filter is fed in dependence on the second signal output by the nonlinear function generator. The first signal received by the nonlinear function generator is derived in dependence on an input signal provided to an input of the LDC unit and an output of the filter. An output of the LDC unit is derived in dependence on the first signal received by the nonlinear function generator and the second signal output by the nonlinear function generator.
摘要翻译： 低延迟校正器（LDC）单元包括非线性函数发生器和滤波器。 非线性函数发生器接收第一信号并根据第一信号和非线性函数发生器的传递函数输出第二信号。 滤波器根据由非线性函数发生器输出的第二信号进给。 根据提供给LDC单元的输入的输入信号和滤波器的输出，导出由非线性函数发生器接收到的第一信号。 根据由非线性函数发生器接收到的第一信号和由非线性函数发生器输出的第二信号，导出LDC单元的输出。
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公开(公告)号：US07728658B2
公开(公告)日：2010-06-01
申请号：US11782702
申请日：2007-07-25
申请人： Jack B. Andersen , Peter G. Craven , Michael A. Kost , Daniel L. W. Chieng , Larry E. Hand , Wilson E. Taylor
发明人： Jack B. Andersen , Peter G. Craven , Michael A. Kost , Daniel L. W. Chieng , Larry E. Hand , Wilson E. Taylor
CPC分类号： H03F1/3258 , H03F1/26 , H03F1/3241 , H03F3/217
摘要： Systems and methods for performance improvements in digital switching amplifiers using low-pass filtering to reduce noise and distortion. In one embodiment, a digital pulse width modulation (PWM) amplifier includes a signal processing plant configured to receive and process an input audio signal. The amplifier also includes a low-pass filter configured to filter audio signals output by the plant. The filtered output of the plant is added to the input audio signal as feedback. The plant may consist of a modulator and power switch, a noise shaper, or any other type of plant. An analog-to-digital converter (ADC) may be provided to convert the output audio signal to a digital signal. Filtering may be implemented before or after the ADC, and a decimator may be placed after the ADC if it is an oversampling ADC.
摘要翻译： 使用低通滤波技术降低噪声和失真的数字开关放大器性能改进的系统和方法。 在一个实施例中，数字脉宽调制（PWM）放大器包括被配置为接收和处理输入音频信号的信号处理设备。 放大器还包括一个低通滤波器，用于滤除工厂输出的音频信号。 工厂的滤波输出作为反馈被添加到输入音频信号。 该设备可以由调制器和电源开关，噪声整形器或任何其它类型的设备组成。 可以提供模数转换器（ADC）以将输出音频信号转换为数字信号。 可以在ADC之前或之后实现滤波，如果ADC是过采样ADC，则可以在ADC之后放置抽取器。
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公开(公告)号：US07706545B2
公开(公告)日：2010-04-27
申请号：US10805594
申请日：2004-03-19
CPC分类号： H04L7/02 , H03F1/523 , H03F3/2171 , H03F2200/331 , H03F2200/342 , H03F2200/351 , H03G7/007 , H04L7/005
摘要： Systems and methods for providing protection from failure events in a digital audio amplification system. One embodiment of the invention comprises a system having a digital amplifier controller, an amplifier output stage coupled to the controller and configured to receive audio signals from the controller, one or more sensors coupled to the output stage and one or more low-pass filters coupled to receive sensor signals from the one or more sensors. The low-pass filter is configured to filter the sensor signals and to provide the filtered sensor signals to the controller, which provides a programmable response to the filtered sensor signals. The response may range from not taking any action, to limiting the amplification of audio signals, to shutting down the system.
摘要翻译： 用于提供数字音频放大系统中的故障事件保护的系统和方法。 本发明的一个实施例包括具有数字放大器控制器的系统，放大器输出级，其耦合到控制器并且被配置为从控制器接收音频信号，耦合到输出级的一个或多个传感器和耦合到输出级的一个或多个低通滤波器 以从一个或多个传感器接收传感器信号。 低通滤波器被配置为对传感器信号进行滤波，并将滤波后的传感器信号提供给控制器，该控制器为滤波后的传感器信号提供可编程响应。 响应可能不在于采取任何行动，限制音频信号的放大，关闭系统。
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