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    • 3. 发明授权
    • Composite video signal generation method and device
    • 复合视频信号生成方法及装置
    • US4982179A
    • 1991-01-01
    • US369075
    • 1989-06-20
    • Kiyotaka OgawaShozo KobatakeKiyoshi KohiyamaYukio Otobe
    • Kiyotaka OgawaShozo KobatakeKiyoshi KohiyamaYukio Otobe
    • H04N11/04H04N9/45H04N9/65H04N11/14H04N11/20
    • H04N11/143H04N9/65
    • A composite video signal generation method and device comprises circuits for processing a digital signal, by which the circuits can be integrated. The method comprises the steps of calculating a digital luminance signal and two digital chrominance signals combined from digital primary color component signals, balance-modulating a subcarrier by the two digital chrominance signals, and combining the balance-modulated signals and the luminance signal. In the balance-modulation step, a series of phase information values by adding one by one a value of a sampling period of the digital primary color component signal per a subcarrier period is obtained, cosine function values and sine function values are operated in response to the phase information values, and the cosine function values and the sine function values are multiplied by the two digital chrominance signals, respectively. Accordingly, phase information values of the device can be varied, and if the sampling period of the system changes, the digital primary color component signals can be converted to the NTSC signal.
    • 复合视频信号产生方法和装置包括用于处理数字信号的电路,通过该电路可以集成电路。 该方法包括以下步骤:计算数字亮度信号和从数字原色分量信号组合的两个数字色度信号,通过两个数字色度信号对子载波进行平衡调制,以及组合平衡调制信号和亮度信号。 在平衡调制步骤中,通过逐个加载每个副载波周期的数字原色分量信号的采样周期的值,一系列相位信息值,余弦函数值和正弦函数值响应于 相位信息值和余弦函数值和正弦函数值分别乘以两个数字色度信号。 因此,可以改变装置的相位信息值,并且如果系统的采样周期改变,则可以将数字原色分量信号转换成NTSC信号。