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    • 6. 发明授权
    • Method of automatic gain modulation and apparatus implementing the same
    • 自动增益调制方法及其实现方法
    • US08416966B2
    • 2013-04-09
    • US12899830
    • 2010-10-07
    • An Pang LiChih-Lung ChenChun Hsien Su
    • An Pang LiChih-Lung ChenChun Hsien Su
    • H03G3/00
    • H03G3/3089H03G3/3005
    • Provided is method for automatic audio gain modulation and a related apparatus. In order to prevent the unstable signals as continuously increasing or decreasing the gain when the signals hover around an upper threshold, it's featured that the method is to predict the signal intensity as pre-adding a predict gain in a hold time before outputting signals. By determining whether the prediction exceeds a predetermined threshold or not, the suitable and adjustable gains can be obtained without exceeding the predetermined threshold. In the automatic gain control mechanism, it's to decrease the gain gradually as automatically entering an attack time, or to increase the gain gradually as performing a conventional auto-gain control procedure including entering a release time. The claimed method can modulate the gain automatically by predicting the gain, and confine the signals under a threshold. In addition to avoid sawtooth phenomena, the method can stabilize the signals.
    • 提供了一种用于自动音频增益调制的方法和相关装置。 为了防止不稳定信号在信号悬停在上限阈值附近时持续增加或减小增益,其特征在于该方法是在输出信号之前将信号强度预测为在预设增益保持时间内预加增益。 通过确定预测是否超过预定阈值,可以在不超过预定阈值的情况下获得适当和可调节的增益。 在自动增益控制机构中,随着自动进入攻击时间逐渐减小增益,或者随着执行常规的自动增益控制程序(包括进入释放时间)而逐渐增加增益。 所要求的方法可以通过预测增益自动调制增益,并将信号限制在阈值以下。 除了避免锯齿现象外,该方法可以稳定信号。
    • 9. 发明授权
    • Wide dynamic input range transconductor-based amplifier circuit for
speech signal processing
    • 宽动态输入范围基于跨导体的放大电路,用于语音信号处理
    • US5844444A
    • 1998-12-01
    • US800712
    • 1997-02-14
    • Chin-san WuChun-hsien Su
    • Chin-san WuChun-hsien Su
    • H03G3/20H03G3/30
    • H03G3/301
    • A two-opamp gain stage wide dynamic range automatic level control circuit (WDR ALC) for implementation in a speech applications is disclosed. The first gain stage is formed by an inverting opamp with a transconductor device in the feedback loop. The first gain stage produces an output voltage which is coupled to a second gain stage via an ac coupling capacitor. The second gain stage is formed by an inverting opamp which produces the output voltages for the (WDR ALC). A fraction of the first stage's output voltage is fed back to the transconductor device. The transconductor device acts as a voltage controlled resistor that is effectively parallel with the feedback resistor of the first stage opamp. The output voltage of the second stage is fed back to peak detector adapted for speech electronic circuitry applications. The output of the peak detector is compared with a preset peak voltage by a converter which generates the control voltage for the transconductor device. Upon being activated, the transconductor device sinks a fraction of input current that is proportional to the output voltage of the first stage which effectively reduces the gain of the first stage. The gain reduction of the first stage suppresses the output voltage of the second stage to control the over gain of the (WDR ALC). The object of having an automatic level control circuit (ALC) operational over a broad range of input voltages is accomplished by virtue of having the input voltage applied directly to the first gain stage which is not affected by the transconductor device. The relaxation of the dependency of performance of the ALC on a transconductor device results in simplifying the design of the transconductor device.
    • 公开了一种用于语音应用中实现的双运放增益级宽动态范围自动电平控制电路(WDR ALC)。 第一增益级由在反馈回路中具有跨导器件的反相运算放大器形成。 第一增益级产生经由交流耦合电容耦合到第二增益级的输出电压。 第二增益级由产生(WDR ALC)的输出电压的反相运算放大器形成。 第一级输出电压的一小部分被反馈到跨导器件。 跨导器件用作与第一级运算放大器的反馈电阻有效并联的压控电阻器。 将第二级的输出电压反馈到适用于语音电子电路应用的峰值检测器。 通过转换器将峰值检测器的输出与预设的峰值电压进行比较,该转换器产生跨导器件的控制电压。 在被激活时,跨导器件吸收与第一级的输出电压成比例的一部分输入电流,其有效地降低了第一级的增益。 第一级的增益减小抑制第二级的输出电压来控制(WDR ALC)的过度增益。 具有在宽范围的输入电压下工作的自动电平控制电路(ALC)的目的是通过使输入电压直接施加到不受跨导体器件影响的第一增益级来实现。 ALC对跨导器件的性能的依赖性的放宽导致了跨导体器件的设计的简化。
    • 10. 发明授权
    • Plasma system
    • 等离子体系
    • US08092750B2
    • 2012-01-10
    • US12388552
    • 2009-02-19
    • Chi-Hung LiuChen-Der TsaiChun-Hsien SuWen-Tung HsuJen-Hui TsaiChun Huang
    • Chi-Hung LiuChen-Der TsaiChun-Hsien SuWen-Tung HsuJen-Hui TsaiChun Huang
    • H05H1/24
    • H05H1/2406H05H2001/2456
    • A plasma system for generating a plasma is generated. The plasma system includes a tube, a positive electrode and a negative electrode. The tube has a plasma jet opening, a first end surface and a second end surface. The plasma jet opening penetrates the wall of the tube. The plasma passes through the plasma jet opening and is emitted to the outside of the tube. The positive electrode has a side surface facing and adjacent to the tube. The negative electrode is separated from the positive electrode by a first predetermined distance. The negative electrode has a negative electrode side surface facing and adjacent to the tube. The first positive electrode and the first negative electrode are disposed between the first end surface and the second end surface, and a portion of the plasma jet opening is disposed between the positive electrode and the negative electrode.
    • 产生用于产生等离子体的等离子体系统。 等离子体系包括管,正极和负极。 管具有等离子体射流开口,第一端面和第二端面。 等离子体射流开口穿过管的壁。 等离子体通过等离子体射流开口并被发射到管的外部。 正极具有面向和邻近管的侧表面。 负极与正极分离第一预定距离。 负极具有面对并与管相邻的负极侧面。 第一正极和第一负极设置在第一端面和第二端面之间,等离子体喷射口的一部分配置在正极和负极之间。