JPS61217904A - Video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To reproduce separate information without exerting an influence on a reproduced picture by superposing and recording the separate information of a data, etc. except a video signal, in a horizontal scanning period which is invisible on a picture following a vertical retrace line period of the video signal. CONSTITUTION:At the time of recording, separate information which has been inputted from a separate information input terminal I10 is modulated to a signal being interchangeable with a video signal by a separate information modulating circuit 11, and thereafter, superposed in a horizontal scanning period which is invisible on a picture following a vertical retrace line period of the video signal inputted to a video signal input terminal S10 by a mixing circuit 12, and recorded by a VTR 13. At the time of reproduction, the separate information which has been modulated by a separating circuit 14 is sampled from a signal which has been reproduced by the VTR 13, and stored in a storing circuit 15. In accordance with necessity, the modulated separate information is fetched from the storing circuit 15, converted to video information by a separate information processing circuit 16, and thereafter, replaced with a video signal by a replacing circuit 17 and sent to a composite video signal output terminal S11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to simultaneous recording of information other than video signals in a video signal recording/reproducing device.

[Summary of the invention]

The present invention provides a method for simultaneously recording other information such as the date on a video signal recording/reproducing device, in which information other than the video signal is recorded during the horizontal scanning period that is not visible on the screen following the vertical retrace period of the video ('!). By superimposing and recording the above information, separating it during playback, storing it in a storage circuit, and replacing it with any part of the above video signal, it is possible to display the separate information at any location on the playback screen. It is something.

[Prior art]

When simultaneously recording other information other than the video signal using conventional video signal recording and reproducing devices, be sure to replace the specific portion of the video signal before recording.

[Invention h'' - Problems and Objectives to be Solved] However, with the above-mentioned conventional technology, there is a problem that different information can only be displayed in the considered part on both reproduction images, and that it is impossible to erase information once it has been inserted. Therefore, the present invention is intended to solve these problems, and its purpose is to display different information such as 8 inch at any position on the playback screen to prevent the display of images. The present invention provides a signal recording and reproducing device.

[A precautionary measure to resolve the problem]

The video signal recording/reproducing device of the present invention is a device for recording video signals on a magnetic tape by using a rotating magnetic head to form recording tracks close to each other in a diagonal direction. Horizontal lines that cannot be seen on the following screen
During the scanning period, information other than the busy video signal is superimposed and recorded,
It is characterized by having a circuit for storing at least the superimposed separate information in a storage circuit and replacing it with any part of the video signal during reproduction.

[Effect]

According to the above configuration of the present invention, the method of superimposing and recording other information such as the date on the horizontal scanning period following the vertical retrace period that is hidden and invisible on the screen does not affect the playback screen. No, you can play other information such as 8 inch. Furthermore, since the above-mentioned separate information is separated from the above-mentioned video signal and stored in the memory circuit, when it becomes necessary, by replacing it with any part of the above-mentioned video signal, the separate information can be placed anywhere on the playback screen. Can be displayed.

〔Example〕

FIG. 1 is a block diagram of main parts in an embodiment of the present invention, in which a separate information modulation circuit 11 modulates the separate information into a signal that can be superimposed on the video signal during recording, and then modulates the separate information into the video signal. Mixing circuit superimposed on 12. A separating circuit 14 which actually performs recording and reproduction of the video signal, a separation circuit 14 which separates the other information modulated during playback from the video signal, and a storage circuit which stores the other information modulated and the other information added to the video signal. 1
5. A separate information processing circuit 16 for converting the modulated and fixed separate information into video information. and a replacement circuit 17 that replaces the video signal with the modulated separate information. Mano, engineering.

is a separate information input terminal, 81G is a video signal input terminal, 8,1
tit is a composite video signal output terminal.

When writing fa, separate information input terminal. The separate information inputted from the converter is modulated into a signal compatible with the video signal by the separate information modulation circuit 11, and then sent to the video signal input terminal 810 by the mixing circuit 12.
The vertical blanking period of the video signal input to the video signal is superimposed on the horizontal scanning period which cannot be seen on the busy screen, and is recorded by the VTR 15. During playback, the signal is played back by the VTR 15 and modulated by the separation circuit 14 to extract friend information, and then sent to the storage circuit 15.
Store it in . If necessary, the modulated separate information is taken out from the storage circuit 15, converted into video information in the separate information processing circuit 16, and then replaced with the video aS in the replacement circuit 17 and sent to the composite video signal output terminal 8+t.

FIG. 2 is a waveform diagram of the main part of the composite video signal during recording according to the present invention. Vertical synchronization signal 211 equalization pulse 22. Modulated separate information 23 is shown.

〔Effect of the invention〕

As mentioned above, according to the invention, in an apparatus for recording video signals on a magnetic tape by using a rotating magnetic head in close proximity to each other and then forming diagonal recording tracks, the vertical retrace period of the video signal is By superimposing and recording other information such as 8 dimensions other than the horizontal scanning period signal that cannot be seen on the screen following the horizontal scanning period, it is possible to reproduce the other information without affecting the playback screen. By separating the above-mentioned separate information, storing it in a memory circuit, and replacing it with any part of the above-mentioned video signal, the separate information can be displayed at any desired location on the playback screen and the other information can be erased. have

[Brief explanation of drawings]

Figure f81 is a schematic diagram of main parts in one embodiment of the present invention. Figure fa2 is a waveform diagram of the main part of the composite video signal during recording in the present invention. 11...Separate information modulation circuit 12...Mixing circuit 13...VTR 14...Separation circuit 15...Memory circuit 17... ... Replacement circuit 21 ... Vertical synchronization signal 16 ... Separate information processing circuit 22 ... Equalization pulse 23 ... Modulated special information and above

Claims (2)

[Claims] (1) In a device that records video signals by forming diagonal recording tracks close to each other on a magnetic tape using a rotating magnetic head, horizontal scanning that cannot be seen on the screen following the vertical retrace period of the video signal A video signal recording and reproducing device characterized in that information other than the video signal is superimposed and recorded in a period. (2) The video according to claim 1, further comprising a circuit that separates at least the superimposed separate information, stores it in a storage circuit, and replaces it with any part of the video signal during reproduction. Signal recording and reproducing device.