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    • 6. 发明授权
    • Digital modulators for use with sub-nyquist sampling of raster-scanned
samples of image intensity
    • 数字调制器,用于对图像强度的光栅扫描样本进行亚奎尼采样
    • US5532820A
    • 1996-07-02
    • US819890
    • 1992-01-13
    • Christopher H. StrolleHermann J. Weckenbrock
    • Christopher H. StrolleHermann J. Weckenbrock
    • H04N5/93H04L27/00H04N5/76H04N5/92H04N7/12H04N9/78H04N9/797H04N9/80H04N9/82H04N9/83H04N9/835H04N9/84H04N9/898H04N9/79
    • H04N9/7976H04N9/797H04N9/80H04N9/8205H04N9/831H04N9/835H04N9/84H04N9/898
    • Apparatus useful in electronics for the tape recording of a video signal, which is a baseband signal of a prescribed bandwidth extending up to a prescribed maximum frequency, processes the video signal to generate a folded-spectrum video signal. The video signal is digitized and supplied to a digital band-splitting filter with a cross-over frequency at one-half said prescribed maximum frequency, for separating the digitized video signal into samples of a lower-frequency-band component and into samples of a higher-frequency-band component. A balanced modulator is connected for modulating a folding carrier wave of the prescribed maximum frequency, which modulation is done in accordance with the higher-frequency-band component to generate a balanced modulation signal; and the balanced modulation signal is linearly combined with the lower-frequency-band component to generate the folded-spectrum video signal. Preferably, the sampling rate of the digitized video signal is exactly the Nyquist rate of the prescribed maximum frequency, reduces the balanced modulation of a suitably phased folding carrier wave to multiplication of successive samples of the modulating signal alternately by plus one and by minus one. Such multiplications are done without having to use a digital multiplier.
    • 用于磁带记录视频信号的电子设备中的装置,该视频信号是延伸到规定的最大频率的规定带宽的基带信号,处理视频信号以产生折叠频谱视频信号。 视频信号被数字化并提供给具有交叉频率的规定最大频率的二分之一的数字频带分离滤波器,用于将数字化视频信号分离成低频带分量的采样,并将其转换为 较高频带分量。 连接平衡调制器来调制规定的最大频率的折叠载波,该调制根据较高频带分量进行,以产生平衡调制信号; 并且平衡调制信号与低频带分量线性组合以产生折叠频谱视频信号。 优选地,数字化视频信号的采样率恰好是规定的最大频率的奈奎斯特速率,将适当地相位的折叠载波的平衡调制减小到相加的调制信号的连续采样乘以加1和减1。 进行这种乘法而不必使用数字乘法器。
    • 10. 发明授权
    • Circuitry for expanding the effect of a video control signal in multiple
dimensions
    • 用于扩展视频控制信号在多个维度上的效果的电路
    • US4868650A
    • 1989-09-19
    • US164766
    • 1988-03-07
    • Hermann J. Weckenbrock
    • Hermann J. Weckenbrock
    • H04N11/20H03H21/00H04B3/04H04N5/21H04N9/64H04N9/78H04N11/04
    • H04N9/646H04N5/21
    • A control signal spreader for ameliorating undesirable effects of abrupt changes in a control signal in a video signal processor gradually changes the magnitude of the control signal in the horizontal, vertical and temporal dimensions of the video signal. The control signal is applied to a first circuit, which, responsive to positive transitions of the control signal, generates a gradually increasing signal and provides the lesser valued one of the control signal and the generated signal. A delayed version of the control signal is applied to a second circuit, which, responsive to negative transitions of the control signal, generates a gradually decaying signal and provides the greater valued one of the control signal and the generated decaying signal. The first and second circuits are coupled to a third circuit which provides as an output control signal, the greater valued signal provided by the first and second circuits.
    • 用于改善视频信号处理器中的控制信号的突然变化的不期望的影响的控制信号扩展器逐渐改变视频信号的水平,垂直和时间维度中的控制信号的大小。 控制信号被施加到第一电路,其响应于控制信号的正跳变产生逐渐增加的信号并提供控制信号和产生的信号中较小值的一个。 控制信号的延迟版本被施加到第二电路,第二电路响应于控制信号的负变化,产生逐渐衰减的信号,并提供控制信号和产生的衰减信号中较大值的一个。 第一和第二电路耦合到提供作为输出控制信号的由第一和第二电路提供的较大值信号的第三电路。