公开(公告)号：US4607292A

公开(公告)日：1986-08-19

申请号：US480790

申请日：1983-03-31

申请人： Noboru Kojiam ,  Tomomitsu Kuroyanagi ,  Akira Shibata ,  Isao Nakagawa

发明人： Noboru Kojiam ,  Tomomitsu Kuroyanagi ,  Akira Shibata ,  Isao Nakagawa

IPC分类号： H04N9/79 ,  H04N9/84 ,  H04N9/898 ,  H04N5/782

CPC分类号： H04N9/84 ,  H04N9/7925 ,  H04N9/898

摘要： A color signal processing circuit in a video tape recorder for recording a low frequency converted color signal has a voltage controlled oscillator for generating a carrier having a center frequency which is M times as high as a low-frequency sub-carrier frequency, where M is an integer, and a detection circuit for detecting a variation of the oscillation frequency of the voltage controlled oscillator in at least a reproduction mode. A suppression circuit suppresses the change of the oscillation frequency of the voltage controlled oscillator in response to the output signal from the detection means and a control circuit changes the center oscillation frequency of the voltage controlled oscillator depending on whether the signal is processed in the NTSC system or the PAL system in such a way that the suppression range for the change of the oscillation frequency of the voltage controlled oscillator by the suppression for the NTSC system is equal to or wider than that for the PAL system. The control circuit includes a pulse-eliminating frequency divider or a variable frequency division factor.

摘要翻译： 用于记录低频转换颜色信号的录像机中的彩色信号处理电路具有压控振荡器，用于产生中心频率为低频子载波频率M倍的载波，其中M为 以及检测电路，用于至少在再现模式中检测压控振荡器的振荡频率的变化。 抑制电路响应于来自检测装置的输出信号而抑制压控振荡器的振荡频率的变化，并且控制电路根据在NTSC系统中处理信号是否改变压控振荡器的中心振荡频率 或PAL系统，使得通过对NTSC系统的抑制来改变压控振荡器的振荡频率的抑制范围等于或大于PAL系统的抑制范围。 控制电路包括脉冲消除分频器或可变分频因子。