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1. 发明申请

WO1997007594A1 PLL CIRCUIT AND PICTURE REPRODUCING DEVICE 审中-公开
标题翻译： PLL电路和图像再现设备
公开(公告)号：WO1997007594A1
公开(公告)日：1997-02-27
申请号：PCT/JP1996002190
申请日：1996-08-05
申请人： HITACHI, LTD. , HITACHI MICROCOMPUTER SYSTEM, LTD. , TAKAHASHI, Fumihiro , NACHI, Shikiko , YAMAMOTO, Norihisa , FURIHATA, Makoto
发明人： HITACHI, LTD. , HITACHI MICROCOMPUTER SYSTEM, LTD.
IPC分类号： H03L07/08
CPC分类号： H03L7/0893 , H03L7/087 , H03L7/0891 , H03L7/091 , H03L7/14 , H03L7/148 , H03L7/191 , H04N5/44504
摘要： A digital first phase comparator (22) and a sampling type second phase comparator (32) are provided in parallel. The output current Iout2 of the comparator (32) is inputted to a voltage-controlled oscillator (14) when the phase is close to a locked phase. In the other phase, the output current Iout1 of the comparator (22) is inputted to the oscillator (14). When part of a reference signal fs is lost, a complementing circuit (50) complements at least the reference signal fs inputted to the comparator (22) by pulses. A noise detecting and removing circuit (60) detects and removes the noise of the signal fs and inputs the signals fs to the comparators (22 and 32). The circuit (60) stops the operation of the comparators (22 and 32) for a prescribed period of time after detecting the noise. Therefore, the operation of a PLL circuit is stabilized and characters can be displayed sharply on a screen even when the horizontal synchronizing signal of video signals contains noise or part of the signal is lost.
摘要翻译：平行地提供数字第一相位比较器（22）和采样型第二相位比较器（32）。当相位接近锁定相位时，比较器（32）的输出电流Iout2被输入到压控振荡器（14）。在另一相位中，比较器（22）的输出电流Iout1输入到振荡器（14）。当参考信号fs的一部分丢失时，补充电路（50）至少补充了通过脉冲输入到比较器（22）的参考信号fs。噪声检测和去除电路（60）检测和去除信号fs的噪声，并将信号fs输入到比较器（22和32）。在检测到噪声之后，电路（60）停止比较器（22和32）的操作一段规定的时间。因此，即使当视频信号的水平同步信号包含噪声或部分信号丢失时，PLL电路的操作也能稳定地显示在屏幕上的字符。

2. 发明申请

WO1998019464A1 SYSTEM USING SIGNAL PROCESSOR FOR VTR 审中-公开
标题翻译：使用VTR信号处理器的系统
公开(公告)号：WO1998019464A1
公开(公告)日：1998-05-07
申请号：PCT/JP1996003144
申请日：1996-10-28
申请人： HITACHI, LTD. , HITACHI TOHBU SEMICONDUCTOR, LTD. , FURIHATA, Makoto , YAMAUCHI, Kenya
发明人： HITACHI, LTD. , HITACHI TOHBU SEMICONDUCTOR, LTD.
IPC分类号： H04N09/80
CPC分类号： H04N9/7917 , H04N9/83
摘要： In a VTR system, a first frequency converting circuit converts a first reproduced color-under signal of the PAL format into a first standard color signal, a delay circuit generates a second color-under signal by delaying the first color-under signal by one horizontal period, a second frequency converting circuit converts the second color-under signal into a second standard color signal, an oscillation circuit generates a frequency signal of a frequency which is 2n times as high as the carrier frequency required for the above-mentioned frequency conversion, the frequency of the frequency signal is divided into the carrier frequency, four carriers having 0 DEG , 90 DEG , 180 DEG , and 270 DEG phases are generated, one of the carriers is selected so that the phases of the crosstalks contained in the first and second standard color signals may be the same or opposite to each other, the phase of the first or second standard color signal is inverted by a phase-axis inverting circuit, and the first standard color signal is subtracted from the second one or added to the second one so as to offset the color crosstalks.
摘要翻译：在VTR系统中，第一频率转换电路将PAL格式的第一再现的彩色下变频信号转换为第一标准彩色信号，延迟电路通过将第一彩色信号延迟一个水平而产生第二彩色信号第二频率转换电路将第二彩色信号转换为第二标准色彩信号，振荡电路产生频率为上述频率转换所需载波频率的2n倍的频率信号，频率信号的频率被分为载波频率，产生了0°，90°，180°和270°相位的四个载波，选择载波之一，使得串扰的相位包含在第一和第二标准颜色信号可以彼此相同或相反，第一或第二标准颜色信号的相位被相位轴反相电路反相，并且从第二标准颜色信号中减去第一标准颜色信号，或将其添加到第二标准颜色信号，以便偏移颜色串扰。

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