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公开(公告)号：US20090302938A1
公开(公告)日：2009-12-10
申请号：US12542634
申请日：2009-08-17
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： 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：US20090143884A1
公开(公告)日：2009-06-04
申请号：US12343317
申请日：2008-12-23
CPC分类号： H03F3/217 , H03F2200/03 , H03H17/0275 , H03H17/0642 , H03H17/0685
摘要： Systems and methods are provided for converting input data streams having variable input sample rates to an output sample rate, which systems and methods are used in processing the data streams. In one embodiment, a system includes a clock source, a counter configured to count cycles for a corresponding data stream, and a data processor. The data processor is configured to read the number of cycles counted by the counter between received frame sync signals and to convert the first data stream to the predetermined output sample rate based on the corresponding number of cycles counted.
摘要翻译： 提供了用于将具有可变输入采样率的输入数据流转换为输出采样率的系统和方法，哪些系统和方法用于处理数据流。 在一个实施例中，系统包括时钟源，被配置为对相应数据流计数周期的计数器和数据处理器。 数据处理器被配置为读取由接收到的帧同步信号之间的计数器计数的周期数，并且基于相应的计数周期将第一数据流转换成预定的输出采样率。
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公开(公告)号：US20090027117A1
公开(公告)日：2009-01-29
申请号：US11782702
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
IPC分类号： H03F3/38
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：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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5.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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