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1. 发明授权

US07773358B2 Output current control and overload protection in digital audio amplifiers 有权
标题翻译：数字音频放大器的输出电流控制和过载保护
公开(公告)号：US07773358B2
公开(公告)日：2010-08-10
申请号：US11335028
申请日：2006-01-19
申请人： Claus Niels Neesgaard , Lars Risbo , Anker Bjørn-Josefsen
发明人： Claus Niels Neesgaard , Lars Risbo , Anker Bjørn-Josefsen
IPC分类号： H02H3/08
CPC分类号： H03F1/52 , H03F3/183 , H03F3/217 , H03F3/68 , H03F2200/426
摘要： Overcurrent and overload protection for the power output of a pulse-width-modulated digital audio system is disclosed. The overcurrent protection circuitry includes a latch that is set in responsive to output current from the power output stage that exceeds an overcurrent threshold; the output of the latch gates the pulse-width-modulated control signal to block power output for the remainder of the current pulse-width-modulated cycle; upon the end of the cycle, or the beginning of the next, the latch is cleared to enable power output in that next cycle. Overload protection is provided by circuitry including counters for counting the relative number of overcurrent cycles to normal, non-overcurrent cycles, and generating an overload signal to block power output in the event of too frequent overcurrent cycles.
摘要翻译：公开了用于脉冲宽度调制数字音频系统的功率输出的过电流和过载保护。过电流保护电路包括响应于来自功率输出级的输出电流而超过过电流阈值而设置的锁存器; 锁存器的输出将脉冲宽度调制的控制信号门控，以阻止当前脉冲宽度调制周期的其余部分的功率输出; 在循环结束或下一个开始时，锁存器被清零以在下一个周期中使能输出功率。过载保护由包括计数器的电路提供，用于将过电流周期的相对数量计算为正常的，非过电流的周期，并且在过载频率过大的情况下产生过载信号以阻止功率输出。

2. 发明授权

US07492217B2 On-the-fly introduction of inter-channel delay in a pulse-width-modulation amplifier 有权
标题翻译：在脉宽调制放大器中实时介绍通道间延迟
公开(公告)号：US07492217B2
公开(公告)日：2009-02-17
申请号：US10988268
申请日：2004-11-12
申请人： Thomas Holm Hansen , Anker Bjørn-Josefsen , Lars Risbo , Douglas A. Roberson
发明人： Thomas Holm Hansen , Anker Bjørn-Josefsen , Lars Risbo , Douglas A. Roberson
IPC分类号： H03F3/38
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）。

3. 发明授权

US07797065B2 Automute detection in digital audio amplifiers 有权
标题翻译：数字音频放大器中的自动检测
公开(公告)号：US07797065B2
公开(公告)日：2010-09-14
申请号：US11119572
申请日：2005-05-02
申请人： David Edward Zaucha , Venkateswar Reddy Kowkutla , Anker Bjørn-Josefsen , Lars Risbo , Douglas Allen Roberson , Josey George Angilivelil
发明人： David Edward Zaucha , Venkateswar Reddy Kowkutla , Anker Bjørn-Josefsen , Lars Risbo , Douglas Allen Roberson , Josey George Angilivelil
IPC分类号： G06F17/00 , H03G3/00 , H03F3/217
CPC分类号： H03F3/72 , H03F1/12 , H03F1/26 , H03F1/305 , H03F3/181 , H03F3/217 , H03F3/68 , H03F2200/03 , H03F2200/331 , H03F2200/342 , H03F2200/351 , H03G3/341
摘要： A digital audio processor for a digital audio receiver having an improved automute sequence is disclosed. The digital audio processor includes automute detection circuitry that monitors the amplitude of digital audio signals before and after the application of digital filters by digital audio processing circuitry. The amplitude of the input signals are compared against a first threshold level, while the amplitude of the output signals are compared against a second threshold level. In response to the amplitude of the input signals for all of the audio channels falling below the first threshold for a selected time period, a gain stage in each channel ramps down the volume to a mute level, and pulse-width-modulation circuitry is disabled. If the output signal amplitude falls below a second threshold for a channel, the pulse-width-modulation circuitry for that channel is disabled. Hysteresis for the input signal amplitude is preferably added into the automute exit determination.
摘要翻译：公开了一种具有改进的自动序列的数字音频接收机的数字音频处理器。数字音频处理器包括自动检测电路，其监视数字音频处理电路应用数字滤波器之前和之后的数字音频信号的幅度。将输入信号的幅度与第一阈值电平进行比较，同时将输出信号的幅度与第二阈值电平进行比较。响应于在所选择的时间周期内所有音频通道的输入信号的幅度低于第一阈值，每个通道中的增益级将音量降低到静音电平，并且脉冲宽度调制电路被禁用。如果输出信号幅度低于通道的第二阈值，则该通道的脉冲宽度调制电路被禁用。输入信号振幅的迟滞最好加在自动出口确定中。

4. 发明授权

US07279965B2 Reduction of audible artifacts in an audio system 有权
标题翻译：在音频系统中减少可听见的伪影
公开(公告)号：US07279965B2
公开(公告)日：2007-10-09
申请号：US11150952
申请日：2005-06-13
申请人： Thomas Holm Hansen , Lars Risbo , Anker Bjørn-Josefsen
发明人： Thomas Holm Hansen , Lars Risbo , Anker Bjørn-Josefsen
IPC分类号： H03F3/38
CPC分类号： H03F1/305 , H03F1/08 , H03F3/68 , H03F2200/351
摘要： An audio system includes a switch mode amplifier that provides an output signal at an output for driving a load based on at least one control signal. A control system provides the at least one control signal to control the amplifier according to an operating mode of the audio system. In a first mode, the control system providing the at least one control signal to actively control an equivalent output impedance at the output of the amplifier, gradually adjusting the equivalent output impedance from a high-impedance state to a low impedance state, so as to mitigate a voltage drop across the load (e.g., including one or more speakers) when the amplifier is activated to a second mode corresponding to the low impedance state.
摘要翻译：音频系统包括开关模式放大器，其基于至少一个控制信号在输出端提供用于驱动负载的输出信号。控制系统提供至少一个控制信号以根据音频系统的操作模式来控制放大器。在第一模式中，控制系统提供至少一个控制信号以主动地控制放大器输出处的等效输出阻抗，逐渐将等效输出阻抗从高阻抗状态调整到低阻抗状态，以便当放大器被激活到对应于低阻抗状态的第二模式时，减轻负载（例如，包括一个或多个扬声器）的电压降。

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