Abstract: Apparatus provides improved comb filtering of color video signals subject to frequency errors. A charge transfer delay line, part of a comb filter, is caused to vary in delay time in consonance with the frequency errors in the color video signal. A modulator, frequency translates the color video signal such that an associated color synchronization component is translated to a desired frequency. The color synchronization component is compared in frequency to a reference and difference signal generated to control the delay of the above-mentioned delay line and stabilize the frequency of the color synchronization component.

Abstract: A signal pickup stylus which cooperates with an information storing spiral groove on a video disc record is caused to selectively skip groove convolutions of the disc record to produce special effects including stop, fast-forward and reverse motion of the displayed image.

Abstract: 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.

Abstract: Velocity and phase errors in signals derived from a rotating video disc are minimized with the use of a voltage controlled oscillator and an electromechanical transducer. A control circuit employing an active and a passive filter maintains an appropriate frequency response to the voltage controlled oscillator and electromechanical transducer in order to appropriately share a single controlling error signal.

Abstract: Fluid from a hydraulic pressure source is utilized to rotate and support a turntable in a vacuum chamber. Signals representative of the rotational velocity of the turntable are utilized to control the hydraulic pressure of the fluid rotating the turntable.

Abstract: A method of producing a high resolution information storage disc includes the steps of forming a grooved disc coated with an electron beam sensitive material, exposing the coated disc to a signal modulated electron beam, replicating the exposed disc to form a second disc of opposite contour, and utilizing the second disc to produce discs having positive-shaped groove and signal information.

Abstract: A video disc having signal information stored in a spiral groove, has a center hole formed by creating a closed convolution of predetermined diameter concentrically to said spiral groove and removing the disc material within this closed convolution.

Abstract: A composite video signal recorded in a non-standard encoding format is rearranged in a format which can be decoded by standard television circuitry. Simplified circuitry utilizing a relatively inexpensive, narrow band delay line is provided for separating the luminance and chrominance signal components from the non-standard signal. Additional circuitry recombines the separated signal components into a desired composite signal format. Filters are incorporated for providing attenuation to particular frequency regions of the luminance and chrominance signals for effecting a relatively uniform frequency response in the resultant composite signal.