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1. 发明授权

US5444495A Muse-NTSC converter having two oscillators 失效
标题翻译：具有两个振荡器的Muse-NTSC转换器
公开(公告)号：US5444495A
公开(公告)日：1995-08-22
申请号：US294401
申请日：1994-08-23
申请人： Akiko Takahama , Masahiko Nakamura , Hiroyuki Nakayama , Eiji Arita , Yoichi Asamoto
发明人： Akiko Takahama , Masahiko Nakamura , Hiroyuki Nakayama , Eiji Arita , Yoichi Asamoto
IPC分类号： H04N11/20 , H04N7/01
CPC分类号： H04N7/0125 , H04N7/0105 , H04N7/0135 , H04N7/0122
摘要： A MUSE-NTSC converter of a relatively simple and small scale circuit design. An oscillation signal from a 28.63636 MHz oscillator (20) is eight times as large as a subcarrier frequency fsc. A Y image processing circuit (17) and a chroma encoder (18) can perform various kinds of processing, such as dividing a frequency of the oscillation signal from the 28.63636 MHz oscillator (20) and the like, to produce a subcarrier frequency. A signal separating circuit (3') receives the oscillation signal from the 28.63636 MHz oscillator (20) as a single system clock and performs some kinds of signal processing which vary from a full wide mode to a zoom mode. Thus, in performing PLL on system clocks in the MUSE mode and the NTSC mode, there may be only one PLL circuit (21) for synchronizing an oscillation signal from a 32.4 MHz oscillator (19) and the oscillation signal from the 28.63636 MHz oscillator (20) in phase.
摘要翻译：一种MUSE-NTSC转换器，具有相对简单和规模小的电路设计。来自28.63636MHz振荡器（20）的振荡信号是副载波频率fsc的八倍。 Y图像处理电路（17）和色度编码器（18）可以执行诸如将来自28.63636MHz振荡器（20）等的振荡信号的频率进行分频的各种处理，以产生副载波频率。信号分离电路（3'）作为单个系统时钟从28.63636MHz振荡器（20）接收振荡信号，并执行从全宽模式变为变焦模式的某种信号处理。因此，在MUSE模式和NTSC模式下对系统时钟执行PLL时，可以只有一个PLL电路（21）用于使来自32.4MHz振荡器（19）的振荡信号和来自28.63636MHz振荡器的振荡信号 20）同相。

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