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    • 2. 发明授权
    • Phase locked loop circuit with quickly recoverable stability
    • 锁相环电路具有快速恢复的稳定性
    • US4812783A
    • 1989-03-14
    • US88218
    • 1987-08-24
    • Masahiro HonjoAkihiro TakeuchiAtsuo OchiShinichi AkiYukio NakagawaMasaaki Kobayashi
    • Masahiro HonjoAkihiro TakeuchiAtsuo OchiShinichi AkiYukio NakagawaMasaaki Kobayashi
    • H03L7/199H04N5/12H04N5/956H04N5/06
    • H04N5/126H03L7/199H04N5/956
    • A PLL circuit for a phase comparator, a low-pass filter (LPF), a voltage-controlled oscillator (VCO) and a frequency divider. A first control circuit is responsive to a discontinuous phase change of a reference signal of the PLL circuit for inhibiting the operation of the phase comparator or disconnecting the LPF from the phase comparator during a predetermined period so that the discontinuous phase change information is not transmitted through the LPF to the VCO. At the same time, a second control circuit resets the frequency divider by a pulse of the reference signal after the discontinuous phase change or applies a voltage corresponding to the discontinuous phase change to the VCO so that the output signal of the frequency divider is locked in phase to the reference signal after the discontinuous phase change. With the cooperation of the first and second control circuits, the PLL circuit quickly recovers its stable state after the discontinuous phase change of the reference signal.
    • 用于相位比较器的PLL电路,低通滤波器(LPF),压控振荡器(VCO)和分频器。 第一控制电路响应于PLL电路的参考信号的不连续相位变化,用于在预定时段期间禁止相位比较器的操作或者从相位比较器断开LPF,使得不连续相位变化信息不通过 LPF到VCO。 同时,第二控制电路在不连续相变之后通过参考信号的脉冲复位分频器,或将与不连续相位相对应的电压施加到VCO,使得分频器的输出信号被锁定 在不连续相变之后与参考信号相位。 通过第一和第二控制电路的协调,PLL电路在参考信号的不连续相变之后快速恢复其稳定状态。
    • 4. 发明授权
    • Magnetic tape recording/reproducing apparatus
    • 磁带记录/再现装置
    • US4873583A
    • 1989-10-10
    • US943200
    • 1986-12-18
    • Masaaki KobayashiKazuhiro YamanishiAkihiro TakeuchiYoshitomi Nagaoka
    • Masaaki KobayashiKazuhiro YamanishiAkihiro TakeuchiYoshitomi Nagaoka
    • H04N9/80G11B5/008G11B5/02G11B5/027G11B15/02H04N5/76H04N5/7826H04N9/79
    • G11B15/02H04N9/79H04N9/7921
    • A magnetic tape recording/reproducing apparatus comprises a recording signal processing section, a head section, and a reproduced signal processing section. The recording signal processing section comprises a plurality of recording signal processing circuits each for converting a video signal to one or more recordable signals, and a first switch circuit for selectively connecting one of the recording signal processing circuits to the head section. The head section has a plurality of magnetic heads mounted on a single rotary cylinder for recording the recordable signals on a magnetic tape and reproducing the recorded signals from the magnetic tape. The reproduced signal processing section comprises a plurality of reproduced signal processing circuits each for converting the reproduced signals to the original video signal, a second switch circuit for selectively connecting one of the reproduced signal processing circuits to the head section, and a recognition circuit for recognizing what kind of signals are reproduced from the head section and producing a control signal for controlling the second switch circuit.
    • 磁带记录/再现装置包括记录信号处理部分,头部部分和再现信号处理部分。 记录信号处理部分包括多个用于将视频信号转换成一个或多个可记录信号的记录信号处理电路,以及用于选择性地将一个记录信号处理电路连接到头部的第一开关电路。 头部具有安装在单个旋转圆筒上的多个磁头,用于将可记录信号记录在磁带上并再现来自磁带的记录信号。 再现信号处理部分包括多个再现信号处理电路,每个再现信号处理电路用于将再现信号转换为原始视频信号,第二开关电路用于选择性地将再现信号处理电路中的一个连接到头部,以及识别电路,用于识别 从头部再现什么样的信号,并产生用于控制第二开关电路的控制信号。
    • 6. 发明授权
    • Tracking system
    • 跟踪系统
    • US4393417A
    • 1983-07-12
    • US205599
    • 1980-11-10
    • Masaaki KobayashiAkihiro TakeuchiKiyoji Fujisawa
    • Masaaki KobayashiAkihiro TakeuchiKiyoji Fujisawa
    • G11B5/588G11B15/18H04N5/78G11B21/10
    • G11B5/588G11B15/1808
    • A tracking system including positionable elements, rotary video heads mounted on the positionable elements, a control head, a frequency generator attached to a capstan motor, and a displacing pattern generator. The displacing pattern generator includes counters which count the pulses from the frequency generator. The pattern generator is reset by control signals reproduced by the control head, a still pattern generator, and an adding means which adds the output signal from the counters and the output signal from the still pattern generator. The output signal of the displacing pattern generator is amplified and applied to the positionable element. As result, the video head mounted on the positionable element can properly trace on a recorded video track at a normal tape speed or at a different tape speed.
    • 包括可定位元件的跟踪系统,安装在可定位元件上的旋转视频头,控制头,连接到主导轴马达的频率发生器和位移图案发生器。 位移模式发生器包括计数来自频率发生器的脉冲的计数器。 模式发生器由控制头再现的控制信号,静止图形发生器,以及将来自计数器的输出信号和来自静止图案发生器的输出信号相加的加法装置复位。 置换图案发生器的输出信号被放大并施加到可定位元件。 结果,安装在可定位元件上的视频头可以以正常的磁带速度或以不同的磁带速度适当地跟踪记录的视频轨道。
    • 8. 发明授权
    • Video tape recorder for recording a video signal with an additional
time-base reference signal
    • 用于用附加的时基参考信号记录视频信号的录像机
    • US5319467A
    • 1994-06-07
    • US757463
    • 1991-09-10
    • Akihiro TakeuchiMasaaki Kobayashi
    • Akihiro TakeuchiMasaaki Kobayashi
    • H04N5/95H04N9/896H04N9/898H04N9/79
    • H04N9/896H04N9/898
    • An apparatus for recording a video signal onto tracks of a recording tape includes circuitry for producing a first time-base reference signal which is a color burst signal composed of a first predetermined number of sinewave cycles and a second time-base reference signal which is a burst signal composed of a second predetermined number of sinewave signals. The second predetermined number of cycles is larger than the first predetermined number of cycles. The apparatus further includes superimposing circuitry for superimposing the first time base reference signal on an input video signal at intervals of a horizontal scanning period of the video signal and for superimposing the second time base reference signal on the input video signal at intervals of a predetermined number of horizontal scanning periods of the video signal. The apparatus further includes a modulator for modulating an output signal of the superimposing circuitry to obtain a modulated signal and a recording arrangement for recording the modulated signal onto the tracks of the recording tape.
    • 一种用于将视频信号记录在记录带的轨道上的装置包括用于产生第一时基参考信号的电路,该第一时基参考信号是由第一预定数量的正弦波周期组成的色同步信号,以及第二时基参考信号, 突发信号由第二预定数量的正弦波信号组成。 第二预定数量的循环大于第一预定循环次数。 该装置还包括叠加电路,用于以视频信号的水平扫描周期的间隔将第一时基参考信号叠加在输入视频信号上,并且以预定数量的间隔将第二时基参考信号叠加在输入视频信号上 的视频信号的水平扫描周期。 该装置还包括用于调制叠加电路的输出信号以获得调制信号的调制器和用于将调制信号记录到记录带的轨道上的记录装置。