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    • 1. 发明授权
    • Adaptive frequency touchscreen controller
    • 自适应频率触摸屏控制器
    • US06630929B1
    • 2003-10-07
    • US09408594
    • 1999-09-29
    • Robert AdlerJoel KentJeffrey L. SharpGeoffrey D. Wilson
    • Robert AdlerJoel KentJeffrey L. SharpGeoffrey D. Wilson
    • G09G500
    • G06F3/0436
    • A method and apparatus for adapting an acoustic touchscreen controller to the operating frequency requirements of a specific touchscreen are provided. The adaptive controller can either utilize look-up tables to achieve the desired output frequency or the it can use a multi-step process in which it first determines the frequency requirements of the touchscreen, and then adjusts the burst frequency characteristics, the receiver circuit center frequency, or both in accordance with the touchscreen requirements. In one embodiment, the adaptive controller compensates for global frequency mismatch errors. In this embodiment a digital multiplier is used to modify the output of a crystal reference oscillator. The reference oscillator output is used to control the frequency of the signal from the receiving transducers and/or to generate the desired frequency of the tone burst sent to the transmitting transducers. In another embodiment that is intended to compensate for both global and local frequency variations, the adaptive controller uses a digital signal processor. The digital signal processor, based on correction values contained in memory, defines a specific center frequency which preferably varies according to the signal delay, thus taking into account variations caused by localized variations in the acoustic wave reflective array. In yet another embodiment, a non-crystal local oscillator is used to provide the reference signal in the adaptive controller. The use of such an oscillator allows the controller to be miniaturized to a sufficient extent that it can be mounted directly to a touchscreen substrate. A feedback loop is used to compensate for oscillator drift. A discriminator circuit determines the degree of deviation from the desired frequency. The output from the discriminator is used to adjust the frequency of the local oscillator such that it tracks the frequency of the touchscreen.
    • 提供了一种用于使声学触摸屏控制器适应特定触摸屏的操作频率要求的方法和装置。 自适应控制器可以使用查找表来实现期望的输出频率,或者可以使用多步骤过程,其中它首先确定触摸屏的频率要求,然后调整突发频率特性,接收器电路中心 频率或两者均符合触屏要求。 在一个实施例中,自适应控制器补偿全局频率失配误差。 在本实施例中,使用数字乘法器来修改晶体参考振荡器的输出。 参考振荡器输出用于控制来自接收换能器的信号的频率和/或产生发送到发射换能器的音调脉冲串的期望频率。 在旨在补偿全局和局部频率变化的另一实施例中,自适应控制器使用数字信号处理器。 数字信号处理器基于存储器中包含的校正值来定义特定的中心频率,其优选地根据信号延迟而变化,因此考虑到由声波反射阵列中的局部变化引起的变化。 在又一个实施例中,使用非晶体本地振荡器来在自适应控制器中提供参考信号。 使用这种振荡器允许控制器被小型化到足以使其可以直接安装到触摸屏基板上。 反馈回路用于补偿振荡器漂移。 鉴频器电路确定与期望频率的偏差程度。 来自鉴别器的输出用于调整本地振荡器的频率,以便跟踪触摸屏的频率。
    • 2. 发明授权
    • Adaptive frequency touchscreen controller using intermediate-frequency signal processing
    • 自适应频率触摸屏控制器采用中频信号处理
    • US06396484B1
    • 2002-05-28
    • US09408818
    • 1999-09-29
    • Robert AdlerArie RavidGeoffrey D. Wilson
    • Robert AdlerArie RavidGeoffrey D. Wilson
    • G09G500
    • G06F3/0436
    • A method and apparatus for adapting an acoustic touchscreen controller to the operating frequency requirements of a specific touchscreen are provided. The adaptive controller can either utilize look-up tables to achieve the desired output frequency or the it can use a multi-step process in which it first determines the frequency requirements of the touchscreen, and then adjusts the burst frequency characteristics, the receiver circuit center frequency, or both in accordance with the touchscreen requirements. In one embodiment, the adaptive controller compensates for global frequency mismatch errors. In this embodiment a digital multiplier is used to modify the output of a crystal reference oscillator. The reference oscillator output is used to control the frequency of the signal from the receiving transducers and/or to generate the desired frequency of the tone burst sent to the transmitting transducers. In another embodiment that is intended to compensate for both global and local frequency variations, the adaptive controller uses a digital signal processor. The digital signal processor, based on correction values contained in memory, defines a specific center frequency which preferably varies according to the signal delay, thus taking into account variations caused by localized variations in the acoustic wave reflective array. In yet another embodiment, a non-crystal local oscillator is used to provide the reference signal in the adaptive controller. The use of such an oscillator allows the controller to be miniaturized to a sufficient extent that it can be mounted directly to a touchscreen substrate. A feedback loop is used to compensate for oscillator drift. A discriminator circuit determines the degree of deviation from the desired frequency. The output from the discriminator is used to adjust the frequency of the local oscillator such that it tracks the frequency of the touchscreen.
    • 提供了一种用于使声学触摸屏控制器适应特定触摸屏的操作频率要求的方法和装置。 自适应控制器可以使用查找表来实现期望的输出频率,或者可以使用多步骤过程,其中它首先确定触摸屏的频率要求,然后调整突发频率特性,接收器电路中心 频率或两者均符合触屏要求。 在一个实施例中,自适应控制器补偿全局频率失配误差。 在本实施例中,使用数字乘法器来修改晶体参考振荡器的输出。 参考振荡器输出用于控制来自接收换能器的信号的频率和/或产生发送到发射换能器的音调脉冲串的期望频率。 在旨在补偿全局和局部频率变化的另一实施例中,自适应控制器使用数字信号处理器。 数字信号处理器基于存储器中包含的校正值来定义特定的中心频率,其优选地根据信号延迟而变化,因此考虑到由声波反射阵列中的局部变化引起的变化。 在又一个实施例中,使用非晶体本地振荡器来在自适应控制器中提供参考信号。 使用这种振荡器允许控制器被小型化到足以使其可以直接安装到触摸屏基板上。 反馈回路用于补偿振荡器漂移。 鉴频器电路确定与期望频率的偏差程度。 来自鉴别器的输出用于调整本地振荡器的频率,以便跟踪触摸屏的频率。
    • 10. 发明授权
    • Sparkle-free color display
    • 无闪烁彩色显示
    • US5039907A
    • 1991-08-13
    • US298540
    • 1989-01-17
    • Robert Adler
    • Robert Adler
    • H01J29/89
    • H01J29/896
    • A color display is disclosed that has on an inner display surface a periodic pattern of luminescent deposits having a smallest deposit-to-adjacent-deposit pitch "P-D". The display has on an outer surface glare reduction means in the form of an undulating periodic pattern of light-scattering elements whose smallest element-to-adjacent-element pitch "P-E" is significantly less than the pitch "P-D" to avoid moire effects, but significantly greater than the longest wavelength of visible light to minimize diffraction effects. The color display according to the invention may comprise a color cathode ray tube havbing a touch panel on its front surface.
    • 公开了一种彩色显示器,其在内部显示表面上具有具有最小沉积物到相邻沉积间距“P-D”的发光沉积物的周期性图案。 该显示器具有外表面的眩光减少装置,其形式为光散射元件的波形周期性图案的形式,其最小元件相邻元件间距“PE”明显小于间距“PD”以避免波纹效应, 但明显大于可见光的最长波长以最小化衍射效应。 根据本发明的彩色显示器可以包括在其前表面上覆盖触摸面板的彩色阴极射线管。