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公开(公告)号：US4780763A
公开(公告)日：1988-10-25
申请号：US32141
申请日：1987-03-27
申请人： Grant T. McFetridge , Randy K. Hall
发明人： Grant T. McFetridge , Randy K. Hall
CPC分类号： H04N5/265
摘要： A wipe-only effects apparatus has a video mixer with video input terminals for receiving respective input video signals. The mixer combines the input video signals in dependence upon a control signal received at a control input terminal of the mixer. A ramp generator a repetitive ramp signal and applies it to a control input terminal of the video mixer as the control signal. The repetitive ramp signals start at the beginning of the active picture interval of a video field and terminate at a position determined by an operator controlled knob. The transition from one video signal to the other is caused by decreasing the slope of the repetitive ramp signal to zero.
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公开(公告)号：US4758880A
公开(公告)日：1988-07-19
申请号：US32140
申请日：1987-03-27
申请人： Grant T. McFetridge
发明人： Grant T. McFetridge
CPC分类号： H04N9/74
摘要： A matte generator for generating a video signal representative of a matte having a uniform color, has an operator interface for generating signals representing three independent variables which are sufficient to characterize a color. A processor receives the input signals and derives three numerical values from the input signals and from calibration values provided to the processor, and a quadrature modulator receives a subcarrier signal and signals representing the three numerical values and generates an encoded video signal in response thereto. The encoded video signal and a calibration signal are applied to a calibration circuit for comparing the encoded video signal and the calibration signal and providing an output signal representative of the relationship therebetween. The output signal of the calibration circuit is applied to the processor and is used to generate calibration values such that the encoded video signal is brought into predetermined relationship with the calibration signal.
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公开(公告)号：US5287066A
公开(公告)日：1994-02-15
申请号：US883508
申请日：1992-05-15
CPC分类号： H04Q3/521
摘要： A crosstalk reduction circuit compensates for input to output capacitance coupling of each switch of a crosspoint matrix and for output to common level capacitance coupling for each integrated circuit chip that makes up the crosspoint matrix. Each input signal to the crosspoint matrix is capacitively scaled, summed and inverted to produce an "off" isolation compensation signal, and each output signal from the crosspoint matrix is capacitively scaled, summed and inverted to produce an output isolation compensation signal. Each compensation signal is resistively scaled for each output signal, and the scaled compensation signals are subtracted from the output signals to reduce the crosstalk in the output signals.
摘要翻译： 串扰降低电路补偿交叉点矩阵的每个开关的输出到输出电容耦合的输出，并且用于输出到构成交叉点矩阵的每个集成电路芯片的公共电平耦合。 对交叉点矩阵的每个输入信号进行电容量化，相加和反相以产生“截止”隔离补偿信号，并且对来自交叉点矩阵的每个输出信号进行电容缩放，相加和反相以产生输出隔离补偿信号。 每个补偿信号对于每个输出信号进行电阻缩放，并且从输出信号中减去缩放的补偿信号以减少输出信号中的串扰。
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