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公开(公告)号：US4268851A
公开(公告)日：1981-05-19
申请号：US38364
申请日：1979-05-11
CPC分类号： H04N17/00
摘要： A television test line signal generator comprising a read-only memory which is read under the control of a clocked counting circuit, memory outputs being connected via a clocked buffer store to a digital-to-analogue converter, which is followed by a signal filter. The information in the read-only memory is programmed versus signal distortions following thereafter.
摘要翻译： 一种电视测试线信号发生器，包括在时钟计数电路的控制下读取的只读存储器，存储器输出经由时钟缓冲存储器连接到数模转换器，后跟一个信号滤波器。 只读存储器中的信息与之后的信号失真进行编程。
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2.发明授权Method of producing a modulated chrominance signal with suppressed carrier and color carrier modulator for performing the method 失效用抑制载波和色彩载波调制器产生调制色度信号的方法，用于执行该方法
公开(公告)号：US4646137A
公开(公告)日：1987-02-24
申请号：US638133
申请日：1984-08-06
CPC分类号： H04N11/162 , H04N11/143
摘要： A method of producing a modulated chrominance signal with suppressed carrier. A square-wave carrier signal and a color information signal in the form of a sequence of digitally encoded amplitude values are applied to a modulator arrangement. The clock frequency for the amplitude values is an integral multiple of the color carrier frequency and is phase-locked thereto. Each bit of the amplitude values is inverted during one half cycle of the carrier and not inverted in the subsequent half cycle. A first and a second value, respectively are added to the values obtained thus, these first and second values being calculated such that also for input and/or output signal values which are located at a distance from the drive mean values at the input and output ends a total carrier suppression is achieved for the desired input signal level. The modulated analog chrominance signal is available after digital-to-analog conversion.
摘要翻译： 一种抑制载波产生调制色度信号的方法。 以数字编码的幅度值的顺序形式的方波载波信号和颜色信息信号被施加到调制器装置。 振幅值的时钟频率是彩色载波频率的整数倍，并与其锁相。 振幅值的每个位在载波的一个半周期内被反转，并且在随后的半周期中不反转。 分别将第一和第二值加到由此获得的值中，这些第一和第二值被计算为也适用于与输入和输出处的驱动平均值相距一定距离处的输入和/或输出信号值 结束对所需输入信号电平实现总载波抑制。 经数字模拟转换后，调制的模拟色度信号可用。
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