公开(公告)号：US20090116654A1

公开(公告)日：2009-05-07

申请号：US12351627

申请日：2009-01-09

申请人： Thomas H. Hansen ,  Anker Bjoern-Josefsen ,  Lars Risbo ,  Douglas A. Roberson

发明人： Thomas H. Hansen ,  Anker Bjoern-Josefsen ,  Lars Risbo ,  Douglas A. Roberson

IPC分类号： H04R5/00

CPC分类号： H03F3/2173 ,  H03F3/211 ,  H03F3/68 ,  H03F2200/331

摘要： A multiple-channel audio processor (10) and an associated plurality of power stages (22) in an audio system are disclosed. The audio processor (10) includes a plurality of audio amplifier channels (22), each of which includes a pulse-code-modulation (PCM) to pulse-width-modulation (PWM) conversion function (25), which generates PWM signals for application to the plurality of power stages (22). The audio amplifier channels (20) each also include an interchannel delay function (28) for delaying the PWM edges relative to other channels (20), for reducing noise. The audio amplifier channels (20) each also include delay adjust circuitry (32) for gradually increasing and decreasing the interchannel delay of the channel (20) on startup and shutdown. This permits a single control terminal (VALID) at the processor to globally enable and disable all of the power stages (22).

摘要翻译： 公开了音频系统中的多声道音频处理器（10）和相关联的多个功率级（22）。 音频处理器（10）包括多个音频放大器通道（22），每个音频放大器通道包括脉冲编码调制（PCM）到脉冲宽度调制（PWM）转换功能（25），其产生用于 应用于多个功率级（22）。 音频放大器通道（20）每个还包括用于相对于其它通道（20）延迟PWM边沿的通道间延迟功能（28），以减少噪声。 音频放大器通道（20）还包括延迟调整电路（32），用于在启动和关闭时逐渐增加和减少通道（20）的通道间延迟。 这允许处理器处的单个控制终端（VALID）全局地启用和禁用所有功率级（22）。

公开(公告)号：US07894536B2

公开(公告)日：2011-02-22

申请号：US10724817

申请日：2003-11-24

申请人： Lars Risbo ,  Thomas H. Hansen

发明人： Lars Risbo ,  Thomas H. Hansen

IPC分类号： H04B14/04

CPC分类号： H03M3/388 ,  H03M3/458 ,  H03M3/50

摘要： An error model can be utilized to mitigate errors associated with a conversion system, such as an analog-to-digital or digital-to analog converter. The error model is adaptively calibrated to approximate error characteristics associated with at least a portion of the conversion system, such as a digital-to analog converter. The error model can be generated on-line during system operation or off-line to improve performance of various types of signal converters and systems using such signal converters.

摘要翻译： 可以使用错误模型来减轻与诸如模数转换器或数模转换器的转换系统相关联的错误。 误差模型被自适应地校准以近似与转换系统的至少一部分相关联的误差特性，例如数模转换器。 误差模型可以在系统运行或离线期间在线生成，以改善使用这种信号转换器的各种类型的信号转换器和系统的性能。

公开(公告)号：US07346113B2

公开(公告)日：2008-03-18

申请号：US10206750

申请日：2002-07-26

申请人： Thomas H. Hansen ,  Lars Risbo

发明人： Thomas H. Hansen ,  Lars Risbo

IPC分类号： H04B14/04 ,  H04L23/00

CPC分类号： H03M7/3006

摘要： A system and method are provided for stopping a quantized signal from a noise-shaper with a significantly reduced inband transient, compared to a traditional random stop of a noise-shaped signal. The noise-shaped signal is stopped at a favorable time controlled by a detector that monitors the noise-shaped signal. The detector indicates the occurrence of a good time to stop the noise-shaper such that the transient due to the stop is minimized in a fashion that substantially reduces the inband disturbance.

摘要翻译： 与噪声信号的传统随机停止相比，提供了一种系统和方法，用于从具有明显减小的带内瞬态的噪声整形器停止量化信号。 噪声状信号在由监视噪声信号的检测器控制的有利时间停止。 检测器指示出现停止噪声整形器的良好时间，使得由于停止而产生的瞬变以使得带内扰动显着减小的方式被最小化。

公开(公告)号：US06720825B2

公开(公告)日：2004-04-13

申请号：US10104853

申请日：2002-03-22

申请人： Thomas H. Hansen ,  Lars Risbo ,  Venkateswar R. Kowkutla

发明人： Thomas H. Hansen ,  Lars Risbo ,  Venkateswar R. Kowkutla

IPC分类号： H03F338

CPC分类号： H03F3/38 ,  H03F1/305 ,  H03F3/217

摘要： A system and method for reducing audible turn-on and turn-off transients in switching amplifiers employs a frequency shaped start sequence in front of a modulated zero-signal or a frequency shaped stop sequence following a modulated zero-signal.

摘要翻译： 用于减少开关放大器中的可听到的导通和关断瞬变的系统和方法在调制的零信号之后的调制的零信号或频率形状的停止序列前采用频率形状的起始序列。