JPH01166680A - Magnetic recording and reproducing device with character graph input function - Google Patents

Abstract

PURPOSE:To easily input a character and graph by detecting and storing the brightness of a display screen of a CRT, reading the stored brightness while synchronizing the scanning of the spot of the display screen and the scanning of the coordinate in the storage unit of a storage means and recording the result on a magnetic tape of a VTR. CONSTITUTION:When a horizontal, vertical synchronizing signal of a TV signal form generated from a synchronizing signal generator 23 is outputted through a video synthesis circuit 25 and a switch 15, a raster to scan the fluorescent screen of the CRT 32 of a TV receiver 31 is generated. A synchronizing signal generating circuit 23 sends a time serial pulse to a memory 22 via an address generating circuit 24 to synchronize the movement of the raster with the selection of the memory unit in the memory 22. A brightness detector 28 draws a character or graph on the CRT 32 to store (22) a brightness signal. The switch 13 is thrown to the position B, and the brightness signal read from the memory 22 is given to a magnetic recording and reproducing circuit 14. Thus, the character or graph is inputted easily and the device is used proper for the edition of a video tape.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording/reproducing device for recording and reproducing image information on a magnetic recording medium, and is particularly suitable for character/graphic input suitable for recording arbitrary character/graphic information. The present invention relates to a functional magnetic recording and reproducing device.

[Conventional technology]

Today, magnetic recording and reproducing devices [(hereinafter referred to as VTR)
In addition to the widespread use of cameras, video cameras with built-in cameras are following suit. Therefore, in conventional devices that require the insertion of characters and graphics such as titles into images taken by each person, a video camera 1 is used to photograph a sheet 2 with a title written on it, as shown in FIG. The method used was to input it into a VTR3, insert it at the beginning of the magnetic recording medium on which the image had already been taken, and record the title.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, an expensive video camera was required to take pictures of characters such as titles.

The present invention does not require a video camera, but instead creates images of arbitrary characters and figures on the VTR itself, displays them on a display device (specifically, a cathode ray tube (hereinafter referred to as cathode ray tube)), and displays them on the VTR. An object of the present invention is to provide a magnetic recording/reproducing device with a character/graphic input function for recording.

[Means for solving problems]

The above object is to provide a VTR comprising a synchronization generating means for generating a raster on a cathode ray tube, a coordinate input means for detecting the rasco luminance on the cathode ray tube, and a storage means for storing information from the coordinate input means.

This is accomplished by projecting information from the coordinate input means on a cathode ray tube screen to draw characters and figures, and recording this on the magnetic recording medium of the VTR.

[For production]

The synchronization generating means operates to synchronize the movement of the electron beam scanning on the cathode ray tube and the address scanning of the storage means.

Then, the coordinate input means captures the bright spot on the cathode ray tube surface caused by the synchronized electron beam.

It is recorded in the corresponding address of the storage means synchronized with this. Furthermore, the information recorded in the storage means is retrieved and recorded on the magnetic recording medium.

Thereby, images such as characters and figures can be easily handwritten without the need for an expensive video camera.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention,
11 is a magnetic recording and reproducing unit for recording and reproducing video and audio signals on a magnetic recording medium, 12 is a tuner for receiving television video signals, 13° and 15 are switch circuits, and 14 is for running the magnetic recording medium in the longitudinal direction. A mechanical part such as a disk motor that uses a capstan motor and multiple rotating heads to diagonally record video signals on a magnetic recording medium, a servo part that controls these motors at a constant speed, and a servo part that records and reproduces video signals, etc. on the magnetic recording medium. This is a magnetic recording/reproducing circuit consisting of a signal processing section.

On the other hand, 21 is a character/figure synthesis circuit that captures a raster obtained from the screen of a display device (hereinafter referred to as CRT) 32 of a television receiver 31 and stores it in a memory, 22 is a memory, and 23 is a cathode ray tube. A synchronization signal generation circuit 24 matches the coordinates of the above Lascou bright spot with the coordinates of the memory space of the memory 22, and 24 generates a binary address signal for specifying the coordinates of the memory 22 in synchronization with the synchronization signal generation circuit. Address signal generation circuit, 25 is memory 2
2 is an AND gate, 27 is a waveform shaping circuit, and 28 is a brightness detector.

In the figure, switch circuit 1 of character/figure synthesis circuit 21
5 is connected to the (b) side, and the character/figure synthesis circuit 21
．． The television receiver 31 and the brightness detector 28 form a closed circuit.

The television receiver 31 is horizontal in accordance with the television signal format generated by the synchronization signal generator 23.

When the vertical synchronization signal is obtained through the video synthesis circuit 25 and the switch circuit 15, a synchronization separation circuit (not shown) in the television receiver 31 extracts the horizontal synchronization signal and the vertical synchronization signal and displays the fluorescent screen of the cathode ray tube 32. The raster to be scanned is synchronized with the above two signals.

Further, the synchronization signal generation circuit 23 is connected to an address generation circuit 24.
A time-series pulse signal is generated.

Address generation circuit 24 receives this time series signal and generates a binary signal. This address generation circuit 24
The binary signal from drives memory 22. In the memory 22, memory units corresponding to the binary signal are sequentially selected and transferred each time the binary signal is updated.

As a result, the movement (scanning) of the raster on the television receiver 31 and the selection of memory units in the memory 22 are synchronized by the signal from the synchronization signal generation circuit 23.

Now, the information required by the operator is obtained from the screen of the CRT 32 by the brightness detector 28. The brightness detector 28 is composed of an element such as a phototransistor that converts the brightness of light into an amount of current, and is brought into contact with the screen of the CRT 32 to detect a bright spot caused by a passing raster. The signal obtained from the brightness detector 28 is transmitted to the waveform shaping circuit 27, where the signal with a gentle slope is shaped into a binary signal with a brightness detection point of "1", and the waveform is input into the memory 22.

In the memory 22, the signal "1" from the waveform shaping circuit 27 is stored in memory units designated by the address generation circuit 24. At this time, the memory 22 is put into a storage state by the AND gate 26 using the luminance information from the waveform shaping circuit 27 and the timing signal from the address generation circuit 24.
Brightness information is stored. The address of the brightness information stored in this memory 22 corresponds to the position of the brightness detector 28 that is brought into contact with the screen of the CRT 32 because it is expressed in raster coordinates.

The memory 22 stores information in response to the waveform shaping circuit 27, and at the same time always reads the information to the video synthesis circuit 25 in synchronization with the synchronization signal generation circuit 23, that is, in synchronization with the synchronization of the television signal.

In order to simultaneously reproduce information from the memory 22 and store information from the waveform shaping circuit 27 in the memory 22, storage and reproduction are performed sequentially in an address signal generation interval that specifies one memory unit.

FIG. 2 is a waveform diagram illustrating the recording and reproducing states of the memory 22. Recording and playback of the memory 22 is shown in FIG. 2 (A).
In one address signal section of.

A recording/reproducing control signal shown in (B) is generated by the address signal generating circuit 24 to control the recording and reproducing states of the memory 22. The recording/reproduction control signal controls the memory 22 via the AND gate 26, and the recording is ORed with the signal from the waveform shaping circuit 27 to give a signal of "1" to the recording section. If the logical sum does not hold, the state is a reproduction state. In order to achieve both recording and reproduction in one address section, the information in the memory 22 for the reproduction section of the recording/playback control signal (B) is recorded in a buffer memory (not shown) provided in the video synthesis circuit 25, and the information for reproduction ( It is possible to record (E) into the memory 22 in the recording section without interrupting C) and (D).

That is, information in one address section is reproduced from the buffer memory, and reproduction and recording are executed without interrupting the information.

Now, the information read out from the memory 22 is combined into a television video signal by the video combining circuit 25 and inputted to the television receiver 31 through the switch circuit 15. The television receiver 31 processes the video signal and displays characters and graphics on one screen.

The trajectory of the brightness detector 28 arbitrarily drawn while touching the screen of the CRT 32 is recorded in the memory 22 by capturing the bright spots of the raster scanning the CRT 32.

The information in the memory 22 is sequentially read out, and the touch position of the brightness detector 28 on the CRT 32 is operated to emit light.

Title images of arbitrary characters and figures drawn on the CRT 32 in this way by operating the brightness detector 28 are stored in the memory 22.
The video signal is read out from the video signal, synthesized into a television video signal by the video synthesis circuit 25, and inputted to the switch circuit 13. The switch circuit 13 is operated to connect to the (b) side and record it as a title at the beginning of a magnetic recording medium (hereinafter referred to as magnetic tape).

According to the present invention, it is possible to create an arbitrary title picture on a CRT and record it as a title on a magnetic tape, and furthermore, it is possible to use the memory to take notes using handwritten characters.

〔Effect of the invention〕

As explained above, according to the present invention, an image of five characters or figures can be drawn directly on the cathode ray tube screen of a television receiver, and the drawn image can be recorded on a magnetic tape. It is possible to easily input a title when editing a tape, and to provide a magnetic recording and reproducing device with a character/graphic input function that has excellent functions while eliminating the drawbacks of the prior art described above.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a waveform diagram showing recording and reproducing states of a memory, and FIG. 3 is a conceptual diagram showing a conventional example. 11... Magnetic recording and reproducing section, 12... Tuner, 13
゜15...Switch circuit, 14...Magnetic recording/reproducing circuit. 21...Character/figure synthesis circuit, 22...Memory, 23
. . . synchronous signal generation circuit, 24 . . . address signal generation circuit. 25...Video synthesis circuit, 26...And gate, 2
7... Waveform shaping circuit, 28... Brightness detector, 31...
...Television receiver, 32...Display device.

Claims (1)

[Claims] 1. In a magnetic recording and reproducing device that obliquely records and reproduces information on a magnetic recording medium using a plurality of rotating heads, there is provided a detection means for detecting light from a light emitting surface of a display device, a storage means for storing signals from the detection means, and the display device. comprising a synchronizing means for synchronizing the scanning of a bright spot on the light emitting surface of the storage means and the scanning of the coordinates of the storage unit of the storage means, and configured to record information stored in the storage means on a magnetic recording medium of the magnetic recording and reproducing device. A magnetic recording/reproducing device with a character/figure input function.