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21. 发明授权

US07584009B2 Multi-chip PWM synchronization and communication 有权
标题翻译：多芯片PWM同步通讯
公开(公告)号：US07584009B2
公开(公告)日：2009-09-01
申请号：US10805593
申请日：2004-03-19
申请人： Jack B. Andersen , Daniel L. W. Chieng , Michael A. Kost , Jan A. Larson
发明人： Jack B. Andersen , Daniel L. W. Chieng , Michael A. Kost , Jan A. Larson
IPC分类号： G06F17/00
CPC分类号： H04L7/02 , H03F1/523 , H03F3/2171 , H03F3/2175 , H03F2200/331 , H03G7/007 , H04L7/005
摘要： Systems and methods for synchronizing multiple digital audio controller chips, wherein one of the chips is designated as a master and the other chips are designated as slaves. A common line connects all of the chips and is used to transmit synchronization signals from the master to the slaves. Each of the chips listens for an appropriate signal and, when the signal is detected, all of the chips simultaneously begin operation. In one embodiment, the synchronization signal comprises a transition on the shared line to an active state. The transition is repeated at fixed intervals and maintained in the active state for a fixed period in order to enable the chips to determine whether synchronization is being maintained. The signal may be sampled and/or filtered to improve reliability. The chips may be able to drive the shared line active to indicate that synchronization has been lost.
摘要翻译：用于同步多个数字音频控制器芯片的系统和方法，其中芯片之一被指定为主机，而其他芯片被指定为从机。一条公共线路连接所有芯片，并用于将同步信号从主机传输到从机。每个芯片侦听适当的信号，并且当检测到信号时，所有芯片同时开始运行。在一个实施例中，同步信号包括在共享线路上的转换到活动状态。以固定的间隔重复该转换，并将其保持在活动状态一段固定的时间段，以便芯片确定是否保持同步。信号可以被采样和/或滤波以提高可靠性。芯片可能能够驱动共享线路活动以指示同步已丢失。

22. 发明授权

US07590251B2 Clip detection in PWM amplifier 有权
标题翻译： PWM放大器中的片段检测
公开(公告)号：US07590251B2
公开(公告)日：2009-09-15
申请号：US10805588
申请日：2004-03-19
申请人： Jack B. Andersen , Larry E. Hand , Wilson E. Taylor
发明人： Jack B. Andersen , Larry E. Hand , Wilson E. Taylor
IPC分类号： H03G7/00 , H04B15/00 , G06F17/00
CPC分类号： H03M3/48 , H03F1/523 , H03F3/2171 , H03F2200/331 , H03F2200/66 , H03G3/002 , H03G7/007 , H04L7/005 , H04L7/02
摘要： Systems and methods for detecting clipping conditions in an audio signal and processing the signal to reduce the clipping conditions. In one embodiment, a system comprises a noise shaper, a modulator, an output stage and other components. A detector detects clipping in the noise shaper and a signal processor processes the audio signal input to the noise shaper based on feedback received from the detector. The signal processor may function to modify the input audio signal in different ways in response to different conditions that are detected by the detector. A filter may be included to filter the output of the detector before being provided to the signal processor. A flag circuit may be coupled between the filter and the signal processor to assert an output signal until the signal processor resets the flag circuit.
摘要翻译：用于检测音频信号中的限幅条件并处理信号以减少削波条件的系统和方法。在一个实施例中，系统包括噪声整形器，调制器，输出级和其它组件。检测器检测噪声整形器中的限幅，并且信号处理器基于从检测器接收到的反馈来处理输入到噪声整形器的音频信号。响应于由检测器检测到的不同条件，信号处理器可以以不同的方式修改输入音频信号。可以包括滤波器以在提供给信号处理器之前对检测器的输出进行滤波。标志电路可以耦合在滤波器和信号处理器之间以断言输出信号，直到信号处理器复位标志电路。

23. 发明授权

US07706545B2 Systems and methods for protection of audio amplifier circuits 失效
标题翻译：用于保护音频放大器电路的系统和方法
公开(公告)号：US07706545B2
公开(公告)日：2010-04-27
申请号：US10805594
申请日：2004-03-19
申请人： Michael A. Kost , Jack B. Andersen , Wilson E. Taylor
发明人： Michael A. Kost , Jack B. Andersen , Wilson E. Taylor
IPC分类号： H03G11/00 , H03G7/00 , H04B15/00 , H02B1/00
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。

24. 发明授权

US07023268B1 Systems and methods for automatically adjusting channel timing 有权
标题翻译：自动调整通道时间的系统和方法
公开(公告)号：US07023268B1
公开(公告)日：2006-04-04
申请号：US10805741
申请日：2004-03-22
申请人： Wilson E. Taylor , Jack B. Andersen , Michael Rovner , Michael A. Kost
发明人： Wilson E. Taylor , Jack B. Andersen , Michael Rovner , Michael A. Kost
IPC分类号： H03F3/38
CPC分类号： H03F3/217 , H03F1/32 , H03F3/181 , H03F2200/03 , H03F2200/331
摘要： Systems and methods for automatically adjusting the alignment of high-side and low-side pulse width modulated signals to improve dead time and shoot-through conditions. In one embodiment, a system includes a digital amplifier controller, an amplifier output stage coupled to the controller and configured to receive audio signals from the controller, and one or more sensors coupled to the output stage. The sensors are configured to detect and/or measure various parameters, such as shoot-through current and distortion, which are associated with the operation of the output stage. The sensors provide feedback to an internal processor or modulator of the controller, which then adjusts the timing of the high-side and low-side signals to improve the operating conditions of the output stage by minimizing shoot-through current and/or distortion.
摘要翻译：用于自动调整高边和低边脉宽调制信号对准的系统和方法，以改善死区时间和直通条件。在一个实施例中，系统包括数字放大器控制器，耦合到控制器并被配置为从控制器接收音频信号的放大器输出级以及耦合到输出级的一个或多个传感器。传感器被配置为检测和/或测量与输出级的操作相关联的各种参数，例如直通电流和失真。传感器向控制器的内部处理器或调制器提供反馈，控制器的调制器然后通过最小化直通电流和/或失真来调节高端和低端信号的定时，以改善输出级的工作状态。

25. 发明授权

US07738613B1 Streaming multi-channel audio as packetized data or parallel data with a separate input frame sync 失效
标题翻译：将多通道音频流作为分组数据或具有单独输入帧同步的并行数据
公开(公告)号：US07738613B1
公开(公告)日：2010-06-15
申请号：US10805574
申请日：2004-03-20
申请人： Jack B. Andersen , Joel W. Page , Daniel L. W. Chieng , Douglas D. Gephardt
发明人： Jack B. Andersen , Joel W. Page , Daniel L. W. Chieng , Douglas D. Gephardt
IPC分类号： H04L7/00
CPC分类号： H04L7/0029 , H03H17/0275 , H03H17/0685 , H04L7/005 , H04L25/4902
摘要： Systems and methods for converting a data stream from a first sample rate to a second sample rate, where the data is received in bursts. In one embodiment, a method includes receiving bursty audio data on a first input line and receiving synchronization data on a second input line that is separate from the first input line. An input sample rate is then estimated for the received audio data based on the received synchronization data and the audio data is converted to an output sample rate. The input sample rate is determined by counting samples received in a time interval and potentially low-pass filtering the result. The audio data may be in packetized, parallel, or other forms, and the synchronization data may include individual signals, such as pulses or bits received at regular or irregular intervals.
摘要翻译：用于将数据流从第一采样率转换为第二采样率的系统和方法，其中数据以突发方式接收。在一个实施例中，一种方法包括在第一输入线上接收突发音频数据，并在与第一输入线分开的第二输入线上接收同步数据。然后，基于接收到的同步数据对接收到的音频数据估计输入采样率，并将音频数据转换为输出采样率。输入采样率通过对在时间间隔中接收到的样本进行计数并潜在地对结果进行低通滤波来确定。音频数据可以是打包的，并行的或其他形式，并且同步数据可以包括各种信号，例如以规则或不规则的间隔接收的脉冲或位。

26. 发明申请

US20090143884A1 SYSTEMS AND METHODS FOR SAMPLE RATE CONVERSION 有权
标题翻译：用于样本速率转换的系统和方法
公开(公告)号：US20090143884A1
公开(公告)日：2009-06-04
申请号：US12343317
申请日：2008-12-23
申请人： Daniel L.W. Chieng , Jack B. Andersen , Larry E. Hand
发明人： Daniel L.W. Chieng , Jack B. Andersen , Larry E. Hand
IPC分类号： G06F17/00 , H04L7/00
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。

27. 发明授权

US07929718B1 Systems and methods for switching and mixing signals in a multi-channel amplifier 有权
标题翻译：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
申请人： Douglas D. Gephardt , Jack B. Andersen , Larry E. Hand
发明人： Douglas D. Gephardt , Jack B. Andersen , Larry E. Hand
IPC分类号： H03F99/00 , H02B1/00 , H04R29/00 , G06F17/00
CPC分类号： H03F3/68 , H03F3/217
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。

28. 发明申请

US20070176660A1 Systems and Methods for Pulse Width Modulating Asymmetric Signal Levels 有权
标题翻译：脉宽调制不对称信号电平的系统与方法
公开(公告)号：US20070176660A1
公开(公告)日：2007-08-02
申请号：US11669643
申请日：2007-01-31
申请人： Jack B. Andersen , Michael A. Kost
发明人： Jack B. Andersen , Michael A. Kost
IPC分类号： H03K3/017
CPC分类号： H03K7/08 , H03F3/2173 , H03F2200/03 , H03F2200/351
摘要： Systems and methods for pulse width modulating waveforms to represent asymmetric signal levels using pulses that are symmetric within their respective switching periods. One embodiment comprises a pulse width modulation system including an asymmetric correction unit and a pair of modulators. The asymmetric correction unit receives samples of an input signal and produces two separate output signals for corresponding modulators. For each sample, the asymmetric correction unit determines whether the signal level of the sample is symmetric or asymmetric. If the signal level of the sample is symmetric, the sample is forwarded to each of the modulators. If the signal level is asymmetric, the asymmetric correction unit increases one modified sample to the next higher symmetric signal level and decreases another modified sample to the next lower symmetric signal level and forwards the modified samples to the modulators.
摘要翻译：用于脉冲宽度调制波形的系统和方法，以使用在其各自的切换周期内对称的脉冲来表示不对称信号电平。一个实施例包括包括非对称校正单元和一对调制器的脉宽调制系统。不对称校正单元接收输入信号的采样，并为相应的调制器产生两个分离的输出信号。对于每个样本，不对称校正单元确定样本的信号电平是对称还是不对称。如果样品的信号电平是对称的，则将样品转发到每个调制器。如果信号电平不对称，则不对称校正单元将一个修改的采样增加到下一个较高的对称信号电平，并将另一个修改的采样降低到下一个较低对称信号电平，并将修改的采样转发到调制器。

29. 发明申请

US20080278230A1 Systems and Methods for Correcting Errors Resulting from Component Mismatch in a Feedback Path 有权
标题翻译：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
申请人： Michael A. Kost , Jack B. Andersen , Daniel L.W. Chieng
发明人： Michael A. Kost , Jack B. Andersen , Daniel L.W. Chieng
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。

30. 发明授权

US07425853B2 Systems and methods for pulse width modulating asymmetric signal levels 有权
标题翻译：用于脉宽调制不对称信号电平的系统和方法
公开(公告)号：US07425853B2
公开(公告)日：2008-09-16
申请号：US11669643
申请日：2007-01-31
申请人： Jack B. Andersen , Michael A. Kost
发明人： Jack B. Andersen , Michael A. Kost
IPC分类号： H03K3/017
CPC分类号： H03K7/08 , H03F3/2173 , H03F2200/03 , H03F2200/351
摘要： Systems and methods for pulse width modulating waveforms to represent asymmetric signal levels using pulses that are symmetric within their respective switching periods. One embodiment comprises a pulse width modulation system including an asymmetric correction unit and a pair of modulators. The asymmetric correction unit receives samples of an input signal and produces two separate output signals for corresponding modulators. For each sample, the asymmetric correction unit determines whether the signal level of the sample is symmetric or asymmetric. If the signal level of the sample is symmetric, the sample is forwarded to each of the modulators. If the signal level is asymmetric, the asymmetric correction unit increases one modified sample to the next higher symmetric signal level and decreases another modified sample to the next lower symmetric signal level and forwards the modified samples to the modulators.
摘要翻译：用于脉冲宽度调制波形的系统和方法，以使用在其各自的切换周期内对称的脉冲来表示不对称信号电平。一个实施例包括包括非对称校正单元和一对调制器的脉宽调制系统。不对称校正单元接收输入信号的采样，并为相应的调制器产生两个分离的输出信号。对于每个样本，不对称校正单元确定样本的信号电平是对称还是不对称。如果样品的信号电平是对称的，则将样品转发到每个调制器。如果信号电平不对称，则不对称校正单元将一个修改的采样增加到下一个较高的对称信号电平，并将另一个修改的采样降低到下一个较低对称信号电平，并将修改的采样转发到调制器。

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