Pioneer Electronic Corporation

Junichi Nakata

Tutomu Banno

Katsumi Kawamura

A video disk player includes a memory for storing a video data signal, a Y/C separator for separating the video data signal stored in the memory means into a luminance signal and a chrominance signal, a sync generator for generating sync signals, a selecting circuit for receiving the luminance signal and the video data signal and for selecting one of the luminance signal and the video data signal as an output signal, the selecting circuit selecting the video data signal as the output signal during a selected horizontal scan period, and a mixer for mixing the sync signals with the output signal and the chrominance signal.

Video disk player comprising a signal circuit for selecting one of a

A special-reproduction processor circuit of a video disk player includes a memory for storing a video data signal, a Y/C separator for separating the video data signal stored in the memory into a luminance signal and a chrominance signal, a sync generator for generating sync signals, a selecting circuit for receiving the luminance signal and the video data signal and for selecting one of the luminance signal and the video data signal as an output signal, the selecting circuit selecting the video data signal as the output signal during a selected horizontal scan period, and a mixer for mixing the sync signals with the output signal and the chrominance signal.

Video disk player comprising a signal selection circuit for selecting

In an apparatus for optically reproducing the recorded information, a circuit to reproduce an RF signal is provided. At least a pair of photo sensors are arranged adjacently in a direction parallel with a tangential line of a recording track of an information recording disc. A light beam is irradiated onto the recording surface of the disc and the reflected light from the recording surface is received by these photo sensor. The phases of both output signals of the photo sensors are made coincident by the phase shift means. The resultant output signals having the same phase are added thereby to form the RF signal. For this purpose, the phase difference between both output signals of the photo sensors is detected and either one of phases of the output signals is shifted in accordance with the phase difference detecting output.

Optical disc player for optically reproducing recorded information on an

A servo system for controlling the position of a reading beam in an optical video disc player or the like in which an offset signal for cancelling an offset in an error signal used for controlling the position of the reading beam is eliminated when the level of the reading signal falls below a predetermined level. Accordingly, erroneous operations such as defocusing and track jumping are prevented when the reading beam crosses scratches, dust, smudges or the like on the recording medium.

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Saitama, Japan

Junichi Nakata