Tracking servo with closed loop gain correction
    2.
    发明授权
    Tracking servo with closed loop gain correction 失效
    跟踪伺服带闭环增益校正

    公开(公告)号:US4616353A

    公开(公告)日:1986-10-07

    申请号:US599941

    申请日:1984-04-13

    IPC分类号: H04N5/76 G11B21/10 H04N5/903

    CPC分类号: G11B21/106 Y10S358/907

    摘要: A tracking servo circuit corrects for closed loop gain variations due to wear of the disc, the width of the electrode of the reproducing stylus, etc. The disc contains an information track bounded by servo tracks used to derive a tracking error signal. This tracking error signal is supplied to an AGC circuit after being filtered and detected. The gain of the AGC circuit decreases as the voltage level of the tracking error signal increases. The tracking error is also supplied to an electric-mechanical conversion system after an oscillatory signal of constant frequency and amplitude is added to it. The oscillator signal is used to stabilize the gain of the servo loop. The electric-mechanical conversion system corrects the position of the stylus in response to these signals.

    摘要翻译: 跟踪伺服电路校正由于盘的磨损,再现触笔的电极的宽度等引起的闭环增益变化。该盘包含由用于导出跟踪误差信号的伺服轨道限定的信息轨道。 该跟踪误差信号经滤波和检测后提供给AGC电路。 AGC电路的增益随跟踪误差信号的电平增加而减小。 在增加恒定频率和振幅的振荡信号之后,跟踪误差也提供给机电转换系统。 振荡器信号用于稳定伺服环路的增益。 电动机械转换系统根据这些信号校正触控笔的位置。

    Picture generating apparatus for a rotary recording medium reproducing
apparatus
    3.
    发明授权
    Picture generating apparatus for a rotary recording medium reproducing apparatus 失效
    用于旋转记录介质再现装置的图像生成装置

    公开(公告)号:US4614982A

    公开(公告)日:1986-09-30

    申请号:US599175

    申请日:1984-04-11

    申请人: Hirozi Ibaraki

    发明人: Hirozi Ibaraki

    摘要: A picture generating apparatus for a disc reproducing apparatus, comprises a circuit for storing at least one picture information data, different from the picture information data of the recorded video signal, from among various additional information, a counter for producing a coincidence signal when a counted value of horizontal synchronizing pulses coincides with a preset value, a data obtaining circuit for successively obtaining the stored picture information data for a predetermined number of scanning lines from a time when the coincidence signal is produced, a circuit for selectively producing a picture signal having a predetermined constant level in a duration in which the picture information data is obtained and the reproduced video signal in a duration in which the picture information data is not obtained, and a circuit for carrying out a control so that the coincidence signal is produced at a point when a number of horizontal synchronizing pulses in the range of 25 have been reproduced more than a value of the preset value at the time of playing a disc recorded with the video signal of a first system employing 525 scanning lines, when playing a disc recorded with a video signal of a second system employing 625 scanning lines so that the horizontal scanning frequency is reproduced with the horizontal scanning frequency of the first system.

    摘要翻译: 一种用于盘再现装置的图像产生装置,包括一个电路,用于从各种附加信息中存储与记录的视频信号的图像信息数据不同的至少一个图像信息数据,计数器,用于当计数时产生符合信号 水平同步脉冲的值与预设值一致;数据获取电路,用于从产生符合信号的时刻连续地获得预定数量的扫描线的存储的图像信息数据;选择性地产生具有 在获得图像信息数据的持续时间和未获得图像信息数据的持续时间中的再现视频信号的预定恒定电平,以及用于执行控制的电路,使得在一点产生一致信号 当已经有25个范围内的多个水平同步脉冲时 当播放利用采用525扫描线的第一系统的视频信号记录的盘时,当播放利用采用625条扫描线的第二系统的视频信号记录的盘时,再现超过预设值的值, 以第一系统的水平扫描频率再现水平扫描频率。

    Horizontal scanning frequency multiplying circuit
    4.
    发明授权
    Horizontal scanning frequency multiplying circuit 失效
    水平扫描倍频电路

    公开(公告)号:US4476490A

    公开(公告)日:1984-10-09

    申请号:US359017

    申请日:1982-03-17

    申请人: Kenji Kaneko

    发明人: Kenji Kaneko

    摘要: A horizontal scanning frequency multiplying circuit comprises a flip-flop supplied with a horizontal synchronizing signal having a horizontal scanning frequency f.sub.H, which is set by this horizontal synchronizing signal, a phase-locked-loop, and a counter. The phase-locked-loop comprises a voltage controlled oscillator for producing a signal having a frequency Nf.sub.H (N is an integer over 1) which is N times the horizontal scanning frequency f.sub.H, a frequency divider for frequency-dividing an output signal frequency of the voltage controlled oscillator, and a phase comparator supplied with one output signal of the flip-flop and an output signal of the frequency divider, for comparing phases of these signals and applying an output error signal to the voltage controlled oscillator to control the oscillation frequency of the voltage controlled oscillator. The counter is supplied with the other output signal of said flip-flop which is reset by this output signal, and supplied with the output signal of the voltage controlled oscillator within the phase-locked-loop as a clock signal, and produces a counted output every time the clock signal is counted for a predetermined counting time T, to supply this counted output to the flip-flop in order to reset the flip-flop. The voltage controlled oscillator within the phase-locked-loop produces a signal having a frequency Nf.sub.H.

    摘要翻译: 水平扫描倍增电路包括提供有由该水平同步信号设置的水平扫描频率fH的水平同步信号的触发器,锁相环和计数器。 锁相环包括用于产生频率为NfH(N为1以上的整数)的信号的压控振荡器,其为水平扫描频率fH的N倍,分频器用于对输出信号频率进行分频 压控振荡器和提供有触发器的一个输出信号的相位比较器和分频器的输出信号,用于比较这些信号的相位并将输出误差信号施加到压控振荡器以控制振荡频率 压控振荡器。 该计数器由所述触发器的另一个输出信号提供,该输出信号由该输出信号复位,并在锁相环内的压控振荡器的输出信号作为时钟信号,产生计数输出 每当时钟信号在预定的计数时间T被计数时,将该计数的输出提供给触发器,以便复位触发器。 锁相环内的压控振荡器产生频率为NfH的信号。

    Means for compatibly reproducing video discs recorded according to
different broadcast standards
    5.
    发明授权
    Means for compatibly reproducing video discs recorded according to different broadcast standards 失效
    用于兼容地再现根据不同广播标准记录的视频光盘的装置

    公开(公告)号:US4445143A

    公开(公告)日:1984-04-24

    申请号:US260589

    申请日:1981-05-06

    CPC分类号: H04N5/7605 G11B19/28

    摘要: A rotary recording medium reproducing apparatus reproduces a recorded signal from a rotary recording medium by use of a reproducing element. The rotary recording medium is recorded with at least a first carrier signal which is modulated by an information signal having a synchronizing signal of a predetermined frequency. The reproducing apparatus comprises a motor for rotating the rotary recording medium, a reference signal generating circuit for generating a reference signal having a frequency equal to a horizontal scanning frequency of a video signal of a standard television system which is characteristic of the reproducing apparatus and should originally be reproduced, or equal to 1/M (M is an integer) times the above horizontal scanning frequency, a detecting circuit for detecting a signal respective of the rotational speed of the rotary recording medium, and a comparator for comparing the reference signal and the signal respective of the rotational speed of the rotary recording medium, to control the rotational speed of the rotary recording medium by a compared output signal thus obtained, so that the synchronizing signal within the reproduced signal is reproduced at a frequency equal to the horizontal scanning frequency of the above standard television system with which the reproduction should originally be performed.

    摘要翻译: 旋转记录介质再现装置通过再现元件再现来自旋转记录介质的记录信号。 记录旋转记录介质中的至少一个第一载波信号,该第一载波信号由具有预定频率的同步信号的信息信号调制。 再现装置包括用于旋转旋转记录介质的马达,参考信号发生电路,用于产生频率等于标准电视系统的视频信号的水平扫描频率的参考信号,该标准电视系统的特征在于再现装置, 最初被再现或等于上述水平扫描频率的1 / M(M是整数)倍的检测电路,用于检测旋转记录介质的旋转速度的信号的检测电路,以及用于将参考信号和 旋转记录介质的旋转速度的信号,通过如此获得的比较输出信号来控制旋转记录介质的转速,使再生信号内的同步信号以等于水平扫描的频率再现 上述标准电视系统的播放频率应该是 最终执行。

    Slow-motion reproducing system in an apparatus for reproducing rotary
recording medium with mode dependent skip pulse generator and field
memories
    6.
    发明授权
    Slow-motion reproducing system in an apparatus for reproducing rotary recording medium with mode dependent skip pulse generator and field memories 失效
    用于再现具有模式相关跳跃脉冲发生器和场存储器的旋转记录介质的装置中的慢动作再现系统

    公开(公告)号:US4439791A

    公开(公告)日:1984-03-27

    申请号:US246722

    申请日:1981-03-23

    申请人: Atsumi Hirata

    发明人: Atsumi Hirata

    摘要: Slow-motion reproducing system is applied to an apparatus for reproducing video signals from a rotary recording medium on which the video signals of a plurality of fields each are recorded along a spiral track for every interval corresponding to one revolution of the medium. This system comprises a reproducing element for tracing along the track of the rotary recording medium and reproducing the signals recorded therealong, a device for causing the reproducing element to shift and skip to an adjacent track turn in response to skip pulses applied thereto, a circuit for generating skip pulses corresponding to modes in which slow-motion reproduction differing from normal reproduction is carried out every period of revolution of the rotary recording medium, the skip pulses being thus generated with timing corresponding to the vertical blanking period positions of the recorded video signals, and for supplying the skip pulses to the skip device, a circuit for demodulating the reproduced signal extracted from the reproducing element, first and second field memories respectively supplied with demodulated video signals extracted from the demodulating circuit, and an operation control circuit for carrying out operation control of the operations of recording of the demodulated video signals of the recorded video signals. Slow-motion reproduced video signals are produced as outputs alternately from the two field memories.

    摘要翻译: 慢动作再现系统被应用于从旋转记录介质重放视频信号的装置,在旋转记录介质上,对应于介质一圈的每个间隔,沿着螺旋轨道记录多个场的视频信号。 该系统包括用于沿着旋转记录介质的轨道跟踪并再现其沿着记录的信号的再现元件,用于响应于施加到其上的跳跃脉冲使再现元件移动并跳过到相邻轨道转弯的装置, 产生对应于在旋转记录介质的每个旋转周期中执行与正常再现不同的慢动作再现的模式的跳跃脉冲,因此,与记录的视频信号的垂直消隐周期位置对应的定时产生跳跃脉冲, 并且用于将跳过脉冲提供给跳过装置,用于解调从再现元件提取的再现信号的电路,分别提供有从解调电路提取的解调视频信号的第一和第二场存储器以及用于执行操作的操作控制电路 控制d的记录操作 已记录的视频信号的视频信号被模拟。 慢动作再现的视频信号是从两个场存储器交替地产生的。

    Rotary recording medium reproducing apparatus
    10.
    发明授权
    Rotary recording medium reproducing apparatus 失效
    旋转记录介质再现装置

    公开(公告)号:US4510532A

    公开(公告)日:1985-04-09

    申请号:US482064

    申请日:1983-04-05

    申请人: Atsumi Hirata

    发明人: Atsumi Hirata

    CPC分类号: G11B21/20

    摘要: A rotary recording medium reproducing apparatus comprises a reproducing stylus for reproducing recorded signals from a rotary recording medium which is recorded with an information signal on a spiral track, by tracing over the spiral track on the rotary recording medium, a reproducing mode setting circuit for setting a reproducing mode of the reproducing apparatus to a special reproduction mode such as a quick-motion reproduction mode in which the reproducing stylus successively shifts to and traces over adjacent track turns of the spiral track and a still picture reproduction mode in which the reproducing stylus repeatedly traces over the same track turn of the spiral track, besides a normal reproduction mode in which the reproducing stylus successively and continuously traces over the spiral track, a stylus pressure control signal generating circuit for generating a stylus pressure control signal of a voltage having a magnitude in accordance with the set reproducing mode, according to the reproducing mode set by the reproducing mode setting circuit, and a stylus pressure applying circuit applied with the stylus pressure control signal generated by the stylus pressure control signal generating circuit, for applying a stylus pressure to the reproducing stylus.

    摘要翻译: 一种旋转记录介质再现装置,包括:再现记录笔,用于通过在旋转记录介质上的螺旋轨道上追踪,将来自旋转记录介质的记录信号再现在螺旋轨道上的信息信号,再现模式设置电路,用于设置 再现装置的再现模式是特殊再现模式,例如快速再现模式,其中再现指示笔连续地移动到并跟踪螺旋形轨道的相邻轨道匝数,并且静态图像再现模式,其中重复触针重复 跟踪螺旋轨道的相同轨道转弯,除了其中再现触针连续地和连续地在螺旋轨道上追迹的正常再现模式之外,还有一个触笔压力控制信号发生电路,用于产生具有幅度的电压的触笔压力控制信号 根据设定的再现模式,按照t o由再现模式设置电路设置的再现模式,以及触针压力施加电路,其应用由触笔压力控制信号产生电路产生的触控笔压力控制信号,以将触针压力施加到再现触笔。