Defect detection and compensation apparatus for use in an FM signal
translating system
    1.
    发明授权
    Defect detection and compensation apparatus for use in an FM signal translating system 失效
    用于FM信号转换系统的缺陷检测和补偿装置

    公开(公告)号:US4001496A

    公开(公告)日:1977-01-04

    申请号:US594429

    申请日:1975-07-09

    IPC分类号: H04N9/882 H04N5/76 G11B9/06

    CPC分类号: H04N9/882

    摘要: In playback of a video record (e.g., in video disc form) employing a FM carrier recording format, a defect compensation system is provided which substitutes delayed video signals for current video signals when a defect is encountered. The current video signals are obtained from the output of the player's pickup-responsive FM detector (illustratively of the zero-crossing detector type) via appropriate frequency responsive circuitry comprising a low pass filter (encompassing the recorded video signal bandwidth: e.g., 0-3 MHz.). To detect the occurrence of a defect, the FM detector output is also supplied to additional frequency responsive circuitry having a wideband response which desirably extends from DC to an upper frequency limit (e.g., 0-6 MHz.) well above the highest frequency of the video signal subject to recording. The wideband circuit output is supplied to pair of voltage level comparators, one supplying an output pulse of a given polarity whenever the wideband circuit output voltage level exceeds a level representative of the FM detector output for the maximum frequency of the FM carrier deviation range employed in recording, and the other supplying an output pulse of the given polarity whenever the wideband circuit output voltage level falls below a level representative of the FM detector output for the deviation range's minimum frequency. The comparator outputs are added together to form a defect indication signal. Switching between current and delayed video signals is controlled in response to the defect indication signal. Operation in the delayed signal mode is maintained for a short period after defect indication pulse termination (to allow video circuitry stabilization following the defect transient) by rendering a retriggerable one-shot responsive to the defect indication signal, and combining the output of the one-shot with the defect indication signal to form the switching control signal.

    Velocity correction for video discs
    2.
    发明授权
    Velocity correction for video discs 失效
    视频光盘的速度校正

    公开(公告)号:US3967311A

    公开(公告)日:1976-06-29

    申请号:US522819

    申请日:1974-11-12

    申请人: Jack Selig Fuhrer

    发明人: Jack Selig Fuhrer

    摘要: In a video disc player, apparatus for generating phase error signals between a reference signal recorded on a video disc record and an external reference are utilized to correct both velocity errors in the recorded signal information and phase errors in the recorded reference signal.

    摘要翻译: 在视频盘播放器中,利用在记录在视频盘记录上的参考信号与外部基准之间产生相位误差信号的装置来校正所记录的信号信息中的速度误差和所记录的参考信号中的相位误差。

    Method for forming a narrowed-electrode pickup stylus for video disc
systems
    5.
    发明授权
    Method for forming a narrowed-electrode pickup stylus for video disc systems 失效
    用于形成用于视盘系统的变窄电极拾取针的方法

    公开(公告)号:US4098030A

    公开(公告)日:1978-07-04

    申请号:US782019

    申请日:1977-03-28

    摘要: A novel pickup stylus includes a tapering dielectric support element which has a tip defined by a prow and a relatively flat surface remote from the prow. The dielectric support element has an arrowhead-shaped cross-section in the region of its tip with the apex of the arrowhead-shape cross-section located on the prow and its base defined by the rear surface. The entire rear surface of the dielectric support element is covered with conductive material to form a narrow electrode in the region of its tip. To form a narrowed-electrode stylus, a tapering dielectric support element, having a prow and an electrode surface remote from the prow, is introduced in a trapezoidal abrasive groove while relative motion is established therebetween. The electrode face of the support element is gradually tilted toward the abrasive groove until it subtends a shallow angle therewith to form a portion having an arrowhead-shape cross-section in the region of its tip. The support element is lapped later to form a bottom surface defining a stylus shoe.

    摘要翻译: 一种新颖的拾取式触针包括锥形电介质支撑元件,其具有由头盔限定的尖端以及远离导板的相对平坦的表面。 电介质支撑元件在其尖端的区域中具有箭头形横截面,其中箭头形横截面的顶点位于起落架上,其底部由后表面限定。 电介质支撑元件的整个后表面被导电材料覆盖,以在其尖端区域中形成窄电极。 为了形成窄电极触针,具有前置离子和远离电极的电极表面的锥形电介质支撑元件被引入梯形研磨槽中,同时在其间建立相对运动。 支撑元件的电极面朝向研磨槽逐渐倾斜,直到与其对准浅的角度,以形成其尖端区域中具有箭头形横截面的部分。 支撑元件稍后被重叠以形成限定触笔的底面。

    Pickup arm assembly
    7.
    发明授权
    Pickup arm assembly 失效
    拾音臂总成

    公开(公告)号:US3963864A

    公开(公告)日:1976-06-15

    申请号:US603805

    申请日:1975-08-12

    申请人: Jack Selig Fuhrer

    发明人: Jack Selig Fuhrer

    IPC分类号: G11B3/38 G11B3/02

    CPC分类号: G11B3/38

    摘要: A pickup arm has an intermediate portion interconnecting a first end portion and a second end portion. An end of the first end portion is secured to a supporting structure of a disc record player. During playback the first and second end portions are substantially parallel to the turntable surface of the player, and the intermediate portion positions the second end portion near the turntable surface. A signal pickup holder carrying a signal pickup is pivoted to an end of the second end porton remote from the pickup arm supported end in a manner that normally aligns the axes of the holder and the second end portion. During playback the intermediate portion positions the second end portion remote end, carrying the signal pickup holder pivot, as near to a disc record disposed on the turntable surface as practicable, in order to reduce the angle included between (a) the disc record surface, and (b) a line joining the signal pickup tip and the signal pickup holder pivot, thereby reducing deleterious, forward and backward displacement of the signal pickup along the disc record spiral groove as a result of up and down motion of the signal pickup in the spiral groove.

    摘要翻译: 拾取臂具有互连第一端部和第二端部的中间部分。 第一端部的端部被固定到盘记录播放器的支撑结构。 在回放期间,第一和第二端部基本上平行于演奏者的转盘表面,并且中间部分将第二端部定位在转盘表面附近。 承载信号拾取器的信号拾取器支架以通常对准保持器和第二端部的轴线的方式枢转到远离拾取臂支撑端的第二端部端口的端部。 在重放期间,中间部分将第二端部远端端部放置在携带信号拾取器保持器枢轴的位置,使其可靠地设置在转盘表面上的盘记录附近,以便减小(a)盘记录表面, 和(b)连接信号拾取头和信号拾取器保持器枢轴的线,由此由于信号拾取器在盘记录螺旋槽中的上下运动而导致信号拾取器沿着盘记录螺旋槽的有害,向前和向后位移 螺旋槽。