Video signal recording and reproducing apparatus for stop motion picture

摘要

A video signal recording and reproducing apparatus for stop motion pictures comprises a memory device for recording a signal, for example, a signal during the period of time of one field corresponding to one scene from telecast video signals, means for extracting a signal corresponding to any one instantaneous scene from video signals produced from a television receiver set or the like for recording on said memory device, and means for effecting repeated reproduction of the recorded signal to produce a video signal for a stop motion picture. The memory device is embodied by a field memory device provided with a magnetic recording medium such as a magnetic disc or magnetic sheet effecting one revolution during the period of time of one field. The employment of the video signal recording and reproducing apparatus for stop motion picture permits a receiver to view, as a stop motion picture, any instantaneous motion picture he desires during the period of viewing the telecast. Recording is restricted to either odd or even fields. As a consequence, previously recorded still frames can be recorded over by a new signal without producing moire noise on playback. Thus, an erase head is not required to remove unwanted still frames from the memory.P PThe present invention relates to a video signal recording and reproducing apparatus, and more particularly to a video signal recording and reproducing apparatus for stop motion pictures in which information from one scene of received video signals varying with the lapse of time is extracted at any time for recording and for reproducing to produce a stop motion picture.PPThe present invention is applicable preferably to a television receiver set.PPConventionally, in such an apparatus as a video tape recorder, efforts have been made in which the stop motion picture is reproduced by stopping the advancement of a magnetic tape during a reproducing operation. The reproduction of the stop motion picture for a long period of time, however, disadvantageously results in damage to the recording medium, and leads to the drawbacks that switching operations from recording to reproducing are complicated, requiring much time and it is difficult to produce excellent pictures because the video tape recorder was not originally designed to reproduce a stop motion picture.PPAn object of the present invention is to remove the above-mentioned drawbacks of the prior art and to produce a stop motion picture of high quality for a long time with a simple operation.PPAnother object of the present invention is to provide a novel television receiver set capable of stopping and viewing any one instantaneous scene from motion pictures in a received telecast or the like.PPIn order to attain the above-mentioned objects, the present invention employs a magnetic disc memory device to extract a video signal corresponding to one scene, for example, one field from successive video signals. The employment of the magnetic disc memory device having a magnetic disc effecting one revolution during the period of time of one field permits a stable video signal for the stop motion picture to be produced by effecting repeated reproduction. Vertical synchronizing signals contained in the successive video signals are employed to take out the video signal corresponding to one field, to initiate and finish the recording, and to control the initiating operation of the reproduction.PPThe video signal recording and reproducing apparatus for stop motion pictures according to the present invention, when used in combination with the television receiver set, provides a novel television receiver set capable of producing moving pictures in response to received television as well as any instantaneous stop motion picture.