KR930007746Y1 - Video-signal control device of vcr - Google Patents

Abstract

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Description

VCR (Video Signal Control Device)

1 is a conventional block diagram.

2 is a block diagram of the present invention.

3 is a signal diagram according to the present invention.

* Explanation of symbols for main parts of the drawings

1: teletext unit 2: first switching unit

3: luminance / color signal control unit 4: second switching unit

5: control unit 6: remote control

7: first switching control unit 8: second switching control unit

9: deck 10: tuner / intermediate frequency section

ANT: Antenna

The present invention relates to a video signal control device of a VCR (Video Cassette Recoder). In particular, in a VCR with a built-in teletext, the entire character of the screen is displayed during the text broadcasting and only the subtitles can be recorded. .

The prior art has been configured to receive text broadcasting and display only on a TV screen, and to mix only subtitles of images on a specific page of the text broadcasting on a template screen to display only.

1 is a block diagram of a prior art, a tuner / intermediate frequency unit 10 for receiving a broadcast video signal, a teletext unit 1 for separating and demodulating only text image data among received broadcast video signals, and a page designation for text images. And a control unit 5 for controlling, a remote controller 6 for remotely outputting a control signal to the control unit 5, a luminance / color signal control unit 3 for recording a broadcast image on a recording tape, and a main broadcast image. And a switching unit 11 for switching the text image.

The operation of the configuration is as follows.

In general, text broadcasting modulates a text image into a digital signal, and transmits it in the blank period of the broadcast video signal.

That is, the digital signal is transmitted on 10-21 lines of the scanning lines (NTSC system: 1-625 lines, PAL system 1-525 lines) that do not appear in the image processing.

The tuner / intermediate frequency unit 10 of FIG. 1 receives a broadcast video signal and transmits the received video signal to the teletext unit 1 and the luminance / color signal control unit 3.

At this time, the luminance / color signal control unit 3 processes only the image signal, and the teletext unit 1 (1) separates only the character data contained in lines 10-21 of the image signal and demodulates the separated digital data into the original character screen. do.

Normally, the number of pages of text broadcasting is 100-899, which transmits various kinds of text information up to 800 pages, and if the user wants to find a desired page, the user controls the controller 5 using the remote controller 6. Upon giving a signal, the control unit 5 transmits a signal to the teletext unit 1 again to find a page desired by the user.

The main image and the text image, which are output signals of the luminance / color signal control unit 3 and the teletext unit 1, are switched through the switching unit 11 and output.

Here, in case of subtitle broadcasting during character broadcasting, the subtitle contents are quickly switched by the transmission door switching unit 11 as the character broadcasting data so that the mixed screen is displayed on the final screen.

However, the prior art has the following disadvantages.

When the caption broadcasting is to be recorded on the recording tape, the reception text is separated from the teletext section and the video recording section, which are the text image section, so that the caption broadcasting cannot be recorded during the text broadcasting.

The present invention aims to eliminate the above drawbacks and to provide a device for displaying only the entire character screen during character broadcasting and recording only when there is subtitle broadcasting.

In order to achieve the above object, the present invention selects and controls a tuner / intermediate frequency unit for receiving a broadcast signal, a teletext unit for demodulating only text broadcasting among the received broadcast signals, and outputting a switching control signal. A control unit capable of inputting an output signal of the tuner / intermediate frequency unit and the teletext unit and switching to output an output signal of the tuner / intermediate frequency unit or a mixed signal of the two output signals, the tuner from the first switching unit A luminance / color signal control unit for inputting and outputting an output signal of the intermediate frequency unit, and a second switching unit for selectively outputting one of the output signals of the teletext unit and the luminance / color signal control unit, and a switching control signal of the teletext unit; Detects the presence or absence of closed captioning and transmits a switching signal according to the / first switching unit and the second switching unit, respectively. Applying a first switch control unit and the second switching control unit.

This will be described below with reference to FIGS. 2 and 3.

2 is a diagram illustrating an embodiment of the present invention, in which an antenna (Ant) for receiving a broadcast signal and a tuner / intermediate frequency unit (10) for selecting and inputting a broadcast signal from the antenna (Ant) and processing intermediate frequencies And a teletext unit (1) for demodulating only a text signal of the received broadcast signal, and a switch for inputting the received broadcast signal and the demodulated text signal and selectively outputting one of a received broadcast signal or a mixed signal of no input signal. A first switching unit 2, a luminance / color signal control unit 3 for recording and processing only video signals of the broadcast signals received from the first switching unit 2, and a deck connected to the luminance / color signal control unit 3 ( 9), a second switching unit 4 for inputting the output signals of the teletext unit 1 and the luminance / color signal control unit 3 to selectively output one of the signals, and a character in the teletext unit 1; Control unit for outputting the page selection signal of the broadcast (5) and the first switching unit (2) according to the presence or absence of closed caption broadcasting by inputting a switching control signal from the remote control unit (6) and the teletext unit (1) for outputting a page selection control signal to the control unit (5). And a first switching controller 7 including a differentiator for outputting a switching signal to the second switching unit 4 and a second switching controller 8 including an integrator.

The operation of the configuration will be described below with reference to FIG.

The broadcast video signal input through the antenna is input through the tuner / intermediate frequency section 10 and the video signal containing the teletext data as shown in FIG. 3a is partially inputted to the first switching unit 2 and partly to the teletext. It is applied to the unit (1).

In this case, the teletext unit 1 decodes only a portion of the line a on which character data is loaded by the page selection signal output from the controller 5 and outputs the same signal as that of the third diagram.

Here, the signal output to the "L" terminal of the first switching unit 2 is a general video signal.

If the entire screen corresponding to the dotted line (TxT data) in FIG. 3b is a character broadcast, the same signal as that of FIG. 3c is output from the teletext unit 1, and in FIG. 3b, it corresponds to the solid line (subtitle data). In the case of closed caption broadcasting, the same signal as that of the 3D diagram is output.

The same signal as the third c and d degrees and the teletext selection mode signal output from the control unit 5 are inputted to the first switching control unit 7 and the second switching control unit 8, respectively. The switching operation of the second switching unit 4 is controlled.

When the controller 5 is not in the teletext mode (TxT "H"), that is, in the normal mode, the first switching controller 7 and the second switching controller 8 are connected to the first switching unit 2. The center terminal (0) is positioned as the terminal (L) to perform the same operation as the general image processing, and when the teletext unit 1 operates in the teletext selection mode in the control unit 5, the output signal (C) , And (D) will have different actions.

First, when the entire screen is a text image, the output signal of the teletext unit 1 of FIG. 2 is output as a dotted line of FIG. 3b, and this signal is output to the terminal H of the first switching unit 2 and the second switching. The terminal H of the unit 4 is waited.

At this time, the signal 3c degree or the like outputted from the teletext unit 1 is transferred to the first switching unit 2 by the switching signal ("L" signal) equal to the 3c 'degree via the first switching control unit 7 including the differentiator. The center terminal (0) of the terminal selects the terminal (L), and the second switching unit (" H ") by the switching signal ("H" signal) such as 3c "degree through the second switching unit control unit 8 including the integrator. The center terminal (0) of 4) selects the terminal (H).

Therefore, the mother video signal is inputted to the luminance / color signal control unit 3 and the output signal TxT of the teletext unit 1 that is waiting for the terminal H of the second switching unit 4 through the image output terminal OUT. character broadcasting screen is displayed.

When receiving the closed caption broadcasting, the output signal of the teletext unit 1 of FIG. 2 is output as an image (subtitle data signal) indicated by the solid line of FIG. 3b, and the switching signal is output as the signal of the 3d degree.

At this time, the signal (D) of FIG. 3 is applied to the first switching unit 2 by the 3d 'degree signal to the first switching unit 2 through the first switching control unit 7 including the differentiator, so that the high speed switching is performed. A low signal, such as a 3d " degree, is applied to the second switching unit 4 as a switching signal through the second switching control unit 8 including the integrator so that the center terminal 0 is positioned at the terminal L. Switch to

Accordingly, a mixed signal of the parent video signal and the closed caption broadcasting is output through the first switching unit 2, and the signal is output through the luminance / color signal control unit 3 and the second switching unit 4. Will be printed.

At this time, since the recording mode is input from the luminance / color signal control section 3 to the deck section 9, the recording mode is recorded.

As described above, according to the present invention, it is possible to detect only subtitle broadcasting during character broadcasting and record it on a tape, which is particularly effective for recording subtitle broadcasting for the hearing impaired and language learning.

Claims (1)

A tuner / intermediate frequency unit 10 for receiving a broadcast video signal, a teletext unit 1 for separating and demodulating only a text broadcast among the received broadcast operation signals, and outputting a switching control signal, and selecting a page for text broadcasting; The control unit 5 to control, inputs the output signal of the tuner / intermediate frequency unit 10 and the teletext unit 1, and selects and outputs the output signal of the tuner / intermediate frequency unit 10 and the mixing signal of the two output signals Inputs an output signal of the tuner / intermediate frequency unit 2 from the first switching unit 2 and the first switching unit 2, and selects and outputs one of the output signals of the luminance / color signal control unit 3 for recording and processing the same Differentiator for inputting the switching control signal of the second switching unit 4 and the teletext unit 1 in consideration of the presence or absence of closed captioning and inputting the switching signal according to the first switching unit and the second switching unit, respectively. First switching control unit 7 including And a second switching controller (8) including an integrator.