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    • 1. 发明授权
    • Carrier signal generating circuit in video signal recording/reproducing
apparatus
    • 视频信号记录/再现装置中的载波信号发生电路
    • US5323242A
    • 1994-06-21
    • US464031
    • 1990-01-12
    • Norihisa YamamotoHirokazu KitamuraKatsuyoshi YamashigeTakashi KuriharaTadashi Matsushima
    • Norihisa YamamotoHirokazu KitamuraKatsuyoshi YamashigeTakashi KuriharaTadashi Matsushima
    • H04N5/923H04N9/84H04M9/80
    • H04N5/923H04N9/84
    • In a video signal apparatus, a carrier signal generating circuit includes a VCO for generating a signal having a frequency at least twice that of a carrier signal necessary for conversion to a lower band with a sub-carrier in an NTSC system, a one-half divider circuit for dividing the VCO frequency signal by two, a delayed flip-flop circuit for receiving the divided signal and the sub-carrier signal to generate a difference frequency signal, a 1/40 divider circuit for dividing the Q output, a phase comparator circuit for comparing the phases of the 1/40 divided signal and the horizontal synchronizing signal to output a phase difference, a frequency discriminator circuit for comparing the phase of the flip-flop output with the frequency-divided output of the horizontal synchronizing signal to output a frequency error, and a circuit for converting the output of the phase comparator circuit and the frequency error into DC voltages and applying their sum as a control voltage for the VCO. A CR constant control circuit controls the CR constant of a four-phase signal generator for converting the output of the one-half divider circuit into a four-phase signal.
    • 在视频信号装置中,载波信号发生电路包括一个VCO,用于产生具有NTSC系统中的子载波转换成较低频带所需的载波信号的至少两倍的频率的信号,一半 用于将VCO频率信号除以2的分频器电路,用于接收分频信号的延迟触发电路和副载波信号以产生差分频率信号,用于分配Q输出的1/40分频器电路,相位比较器 电路,用于比较1/40分频信号和水平同步信号的相位以输出相位差;频率鉴别器电路,用于将触发器输出的相位与水平同步信号的分频输出进行比较以输出 频率误差,以及用于将相位比较器电路的输出和频率误差转换为直流电压并将其和作为VCO的控制电压的电路。 CR恒定控制电路控制用于将二分频电路的输出转换为四相信号的四相信号发生器的CR常数。