Optical read-out system for video disc

Abstract From the Canadian patent

Abstract of the Disclosure, An optical read-out system comprising a matrix of four photoreceptors arranged to develop output signals representing information stored in a video disc as well as error signals for maintaining proper tracking registration of the reading beam with the storage track of the disc. The matrix enables all four photoreceptors to contribute to the development of the output signals and permits separate treatment of high frequency and low frequency signal information for improved results with respect to response and signal-to-noise ratio.