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    • 2. 发明授权
    • Switched capacitor filter for use with a digital-to-analog (D/A)
converter
    • 用于数/模(D / A)转换器的开关电容滤波器
    • US4968989A
    • 1990-11-06
    • US40168
    • 1987-04-20
    • John A. OlmsteadSalomon Vulih
    • John A. OlmsteadSalomon Vulih
    • H03M1/00
    • H03M1/0626H03M1/66
    • The output of a digital-to-analog (D/A) converter is coupled to the input of a filter. The D/A converter is initialized each time a new digital word is applied to the D/A converter for conversion, whereby each data conversion cycle (T.sub.D) includes an initialization interval (T.sub.I) followed by a conversion interval (T.sub.C). During T.sub.I the output of the D/A converter is driven to a reference level and during T.sub.C to the output of the D/A converter corresponds to the value of the input signal. The input section of the filter stores the D/A output just prior to initialization and, for during T.sub.I, coupling the stored value within the filter for processing while inhibiting the coupling to the filter of the reference level present at the D/A output.
    • 数模(D / A)转换器的输出耦合到滤波器的输入端。 每当将新的数字字施加到D / A转换器进行转换时,D / A转换器被初始化,由此每个数据转换周期(TD)包括初始化间隔(TI),随后是转换间隔(TC)。 在TI期间,D / A转换器的输出被驱动到参考电平,并且在TC期间,D / A转换器的输出对应于输入信号的值。 滤波器的输入部分在初始化之前存储D / A输出,并且在TI期间将存储的值耦合到滤波器内进行处理,同时禁止与D / A输出端存在的参考电平的滤波器的耦合。
    • 4. 发明授权
    • PCM Detector
    • PCM检测器
    • US4275416A
    • 1981-06-23
    • US125641
    • 1980-02-28
    • Charles B. Dieterich
    • Charles B. Dieterich
    • H04L25/06H04N7/088H04N9/85H04N9/493H04N7/08
    • H04N9/85H04L25/06H04N7/088
    • A current source supplies current to an integrator representative of a difference between the instantaneous and average values of a video signal having a PCM data component time division multiplexed with an analog luminance component. The integrator is enabled during the central portion of each PCM signaling interval and reset to a reference level during initial and terminal portions of the intervals. Asymmetry of the peak-to-peak PCM signal levels with respect to the average signal level tends to result in asymmetrical excursions of the integrator output voltage relative to the reference level. This asymmetry is corrected by means of a charge source that supplied a predetermined quantity of charge continuously or in discrete packets to the integrator during the central portion of each PCM signaling interval. The integrator voltage excursions are thereby equalized and a substantially uniform probability of detection of the PCM data levels may be realized by means of a threshold device having a threshold level substantially equal to the reference level.
    • 电流源向积分器提供电流,代表具有与模拟亮度分量多路复用的PCM数据分量的视频信号的瞬时和平均值之间的差异。 在每个PCM信令间隔的中心部分期间,积分器被使能,并且在间隔的初始和终端部分期间复位到参考电平。 相对于平均信号电平的峰峰值PCM信号电平的不对称倾向于导致积分器输出电压相对于参考电平的非对称偏移。 通过在每个PCM信号间隔的中央部分期间向积分器连续地或以分立的分组提供预定量的电荷的电荷源校正该不对称性。 因此,积分器电压偏移被均衡,并且可以通过具有基本上等于参考电平的阈值电平的阈值装置来实现PCM数据电平的基本均匀的检测概率。
    • 10. 发明授权
    • Cathode ray tube gun having nested electrode assembly
    • 具有嵌套电极组件的阴极射线管枪
    • US3927341A
    • 1975-12-16
    • US17915471
    • 1971-09-09
    • RCA CORP
    • HUGHES RICHARD HENRY
    • H01J29/50H01J29/51H01J31/20
    • H01J29/506
    • A conventional three-gun assembly for a color cathode ray tube is modified by eliminating the usual radial convergence cup, mounting the radial convergence pole pieces on the forward ends of the last focus electrodes, and providing each gun with a combination magnetic shield and electrode support member in the form of an open frame of magnetic metal mounted on the insulator support rods and having one side attached to the last focus electrode, an opposite side shielding the associated pole pieces from the other pole pieces, and two other connecting sides. The last focus electrode may be one of two tubular electrodes of small diameter having outwardly-flared ends adjacent to each other.
    • 用于彩色阴极射线管的常规三枪组件通过消除通常的径向会聚杯而改变,将径向会聚极片安装在最后聚焦电极的前端上,并为每个枪提供组合磁屏蔽和电极支撑 安装在绝缘体支撑杆上的开放的磁性金属框架形式的构件,并且具有连接到最后一个聚焦电极的一侧,相对的侧面将相关联的极片与另一个极片以及另外两个连接侧相屏蔽。 最后的聚焦电极可以是两个小直径的管状电极之一,其具有彼此相邻的向外扩展的端部。