JPH0337121Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a video tape recorder.

Conventional configuration and problems thereof Conventional video tape recorders record and reproduce video signals, audio signals, and control signals for controlling speed timing on a magnetic tape. In this video tape recorder, it is possible to perform after-recording of audio, and only the audio signal can be changed without erasing the video signal, but it is not possible to add other character signals etc. to the video signal. .

Purpose of the invention This invention is capable of recording and reproducing a character information signal and a control signal for reproduction of the character information signal and video signal independently of a normal video signal, and that it is possible to record and reproduce a character information signal and a control signal for reproduction of the character information signal and a video signal, and to record and reproduce a character information signal and a control signal for reproduction of the character information signal and a video signal. An object of the present invention is to provide a video tape recorder that can selectively display on a screen.

Structure of the invention The videotape recorder of this invention has a pair of rotary heads for recording and playing back ordinary images, and a head that rotates at an angle of 70 degrees or less or 110 degrees with respect to the direction of the cylinder.
A pair of auxiliary rotary heads for recording and reproducing character information signals and reproduction control signals with a gap set at an angle of more than 100 degrees are attached to the cylinder. It is recorded in gaps between video signal recording tracks or overlaid on normal video recording tracks, and during playback, only normal video, only text information, or a composite image of normal video and text information is displayed on the screen based on a playback control signal. That's what I do.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows a block diagram of a video tape recorder according to an embodiment of the invention. In FIG. 1, 1 is a magnetic tape, 2 is a normal video signal recording/reproducing head, 3 is a normal video signal demodulation section, 4 is a video signal mixing section, 5 is a video signal output terminal, and 6 is a recording of character information signals and control signals. a reproduction head, 7 a character information and control signal modulation/demodulation section, 8 a storage section, 9 a control section, 10 a character information and control signal input section, 11
is a playback control signal output terminal.

Next, the operation of this embodiment will be explained with reference to FIG. A normal video signal pre-recorded on the magnetic tape 1 is reproduced by a normal video signal recording/reproducing head 2, demodulated by a normal video signal demodulation section 3, and then added to a video signal mixing section 4 to output a video signal. It is output from terminal 5. Further, the character information and the reproduction control signal added to the character information and control signal input section 10 are converted into codes and are applied to the control section 9. As a result, the control section 9 inputs and stores the character information and playback control signal code corresponding to the code into the storage section 8, outputs the contents of the storage section 8 to the video mixing section 4, and outputs the contents of the storage section 8 to the video mixing section 4 to output the normal video signal. and output from the video output terminal 5. Furthermore, the output of the storage section 8 is applied to the character and control signal modulation/demodulation section 7, and the modulated character information and reproduction control signal are sent to the character information and control signal recording/reproducing head according to an operation command from the control section 9. 6 and recorded on the magnetic tape 1.

The character information and control signal recording/reproducing head 6 is
As shown in Figure 2, the direction of rotation (indicated by arrow A)
The structure is such that the gap G is at an angle of 70 degrees or less or 110 degrees or more. Therefore, there is little crosstalk with the video signal recorded by the normal video signal recording/reproducing head 2. Furthermore, in order to further reduce crosstalk, text information and reproduction control signals are normally recorded at a lower level than video signals.

In FIG. 2, B is a head winding, and C is a head core.

During reproduction, the character information and control signal signals from the recording/reproducing head 6 are demodulated by the character and control signal modulation/demodulation section 7 and applied to the control section 9. The character information and reproduction control signal applied to the control section 9 are either outputted from the control signal output terminal 11 or added to the storage section 8 depending on the contents.
That is, in the case of a reproduction control signal, it is output from the control signal output terminal 11 to control switches (not shown) of the normal video signal input section and the character information signal input section of the video signal mixing section 4. On the other hand, in the case of a character information signal, it is added to the storage section 8;
The contents of are added to the video signal mixing section 4 and outputted from the video signal output terminal 5 as a video signal. Note that whether only normal video is displayed on the screen, only text information, or a composite image of normal video and text information is displayed on the screen depends on the playback control signal. It is determined. Furthermore, the contents of the character information and reproduction control signals are determined when the magnetic tape 1 is stopped, that is, during still operation, and when recording on the magnetic tape 1, all the character information and reproduction control signals for one screen are stored in the memory. 8 and then run the video tape recorder normally to record the text information signal in synchronization with the content of the video signal. Although the description of the recording system for normal video signals is omitted, it has the same configuration as a conventional video tape recorder.

Effects of the invention According to this invention, it is possible to record and reproduce the character information signal and the control signal for reproduction of the character information signal and the video signal independently of the normal video signal, and the display contents on the screen can be changed during reproduction. Control can be performed based on the content of the reproduction control signal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of this invention, and FIG. 2 is a perspective view of a magnetic head. 1...Magnetic tape, 2...Normal video signal recording/reproducing head, 3...Normal video signal demodulation section, 4...Video signal mixing section, 5...Video signal output terminal, 6...
Character information and control signal recording/reproducing head, 7...
Character information and control signal demodulation section, 8... storage section,
9...Control unit, 10...Character information and control signal input unit.

Claims (1)

[Scope of utility model registration request] a normal video signal input section for inputting a normal video signal; a text information and control signal input section for inputting a text information signal and a control signal for reproduction of the text information signal and the normal video signal; a first rotary head for recording the normal video signal inputted by the video signal input section on a magnetic tape and reproducing the normal video signal from the magnetic tape; below 70 degrees or
It has a gap set at 110 degrees or more, and records the character information signal and the reproduction control signal in the gap between the normal video signal recording tracks or overlays the normal video signal recording track, and also records the character information signal from the magnetic tape. a second rotary head that reproduces the information signal and the reproduction control signal; and a mixture that mixes the normal video signal reproduced by the first rotary head and the character information signal reproduced by the second rotary head. a switch provided at the normal video signal input terminal and the character information signal input terminal of the mixing circuit, and a control circuit that controls the switch based on a reproduction control signal reproduced by the second rotary head. equipped with a videotape recorder.