KR940008875B1 - Device for removing korean character on the screen of vcr - Google Patents

Abstract

The apparatus can remove the Hangul title section and display only the caption title by extending caption box signal to the Hangul title section. The apparatus comprises: a low-pass filter (1) receiving the video signal with caption data and passing the low frequency, a caption decoder (2) decoding caption data to ouput box signal/character luminance signal in conversion, a synchronizing signal seperation part (3) seperating horizontal/vertical synchronizing signal from video signal, a switching part (4) compounding video signal and caption signal, a delayed pulse generator (5) generating Hangul title removing signal using vertical synchronization signal.

Description

Hangul Subtitle Remover of Caption VCR

1 is a block diagram showing a caption function of a conventional VCR.

2 is a block diagram showing a Hangul caption removal device when displaying the caption of the present invention.

3 is a detailed circuit diagram of the delay pulse issuing unit of the present invention.

4 is a waveform diagram of each part of (a) to (c) of FIG.

* Explanation of symbols for main parts of the drawings

1: low pass filter 2: caption decoder

3: synchronization signal separation unit 4: switching unit

5: delay pulse generator 6,8,5-1,5-2: AND gate

7: OR gate 5-3,5-4: Multivibrator

The present invention relates to the caption function of the VCR, and in particular, to display only the caption caption by removing the part of the Hangul subtitle when displaying the caption of the caption tape dubbed the Hangul subtitle. As shown in FIG. 1, a caption apparatus of a conventional VCR receives a video signal containing caption data from a luminance / color (Y / C) signal processing stage and passes only a component of 600 KHz or less, and a video signal. A caption decoder 2 which decodes the caption data contained in the caption data and converts the caption data into a BOX signal and a character luminance (LUM) signal, which are backgrounds of Korean subtitles, and a synchronization signal separation unit for detecting a synchronization signal from the video signal. 3) and a switching unit 4 for mixing the caption subtitle signal with the video signal.

The caption device of the conventional VCR configured as described above receives the video signal containing the caption data from the Y / C signal processing stage as shown in FIG. 1 and removes unnecessary high-pass components through the low pass filter 1 to capture the caption decoder 2. To apply.

Therefore, the caption data carried on the video signal applied to the caption decoder 2 is decoded, converted into a box signal and a character luminance signal, and applied to the switching unit 4.

At this time, the switching unit 4 receiving the video signal from the Y / C signal processing stage mixes the caption subtitle signal from the caption decoder 2 so that the caption subtitle can be displayed on the video screen.

On the other hand, the sync signal separating unit 3 to which the video signal is applied detects the horizontal sync signal component and applies it to the caption decoder so as to be used as the decode reference information. The presence or absence of the caption display appearing on the screen is determined by the caption enable signal. The caption or text selection is determined by the caption / text signal.

However, the caption device of the conventional VCR displays the caption subtitles overlapped on the Korean subtitles when the caption subtitles are displayed by replaying the caption tape dubbed the Korean subtitles. There was a problem appearing on the video screen simultaneously with the English caption subtitles.

In order to solve the conventional problem, the present invention detects a vertical synchronization signal from a video signal and generates a delay pulse signal so that the caption box signal is extended to the Korean subtitle area when the caption subtitle is displayed. Referring to the configuration and effect of the present invention by the accompanying drawings as follows.

First, the caption device of the VCR of the present invention receives a video signal containing caption data from the Y / C signal processing stage as shown in FIG. 2 and detects and passes only 60 KHZ or less components, and the caption data. A caption decoder (2) for decoding and converting the signal into a box signal and a character luminance signal, a synchronization signal separation unit (3) for detecting a synchronization signal from the video signal, and a switching unit for mixing the caption subtitle signal with the video signal ( 4), a delay pulse generator 5 for outputting the Hangul subtitle removal signal using the vertical synchronization signal output from the sync signal separator 3, and an AND gate 6 for selectively outputting the Hangul subtitle removal signal. ), An OR gate 6 that adds the box signal and the Hangul subtitle removing signal converted and output from the caption decoder 2, and an AND gate 8 that controls whether the box signal and the Hangul subtitle removing signal are output.

On the other hand, as shown in FIG. 3, the delay pulse generator 5 includes AND gates 5-1 and 5-2 for trigger pulse input, resistors R1 and R2 for setting a pulse output time, and The capacitors C1 and C2 and the multivibrators 5-3 and 5-4 which output pulse signals having a predetermined width during the set time.

As shown in FIG. 2, the caption device of the VCR of the present invention configured as shown in FIG. 2 uses a low-pass filter (1) for capturing video signals containing caption data reproduced from the Y / C signal processing stage. The noise is removed and applied to the caption decoder 2.

The caption decoder 2 decodes the caption data carried on the applied video signal, converts the caption data into a box signal and a character luminance signal, and mixes the video signal with the converted box signal and the character luminance signal. This allows the caption subtitles to be mixed and displayed on the video screen. Meanwhile, the sync signal separator 3 to which the video signal is applied separates the horizontal sync signal necessary for the caption decoder 2 to operate normally from the video signal to the caption decoder 2, and also the vertical sync signal. The separation is applied to the delay pulse generator 5.

At this time, the vertical synchronous signal processing applied to the delay pulse generator 5 is made of a Hangul subtitle removing signal that expands the caption box to cover the entire Hangul subtitle, and is outputted according to whether the Hangul subtitle control signal is inputted. Is applied to the OR gate 7 which sums up with the box signal output converted from the caption decoder 2).

In this way, the Hangul subtitle removing signal applied to the OR gate 7 is applied to the AND gate 8 so that the box signal and the Hangul subtitle removing signal are transmitted by the AND gate 8 only when there is a box signal output from the caption decoder 2. Is applied to the switching section 4.

Meanwhile, as shown in FIGS. 3 and 4, the delay pulse generator 5 transmits to the multivibrator 5-3 through the AND gate 5-1 when the vertical synchronization signal goes from "low" to "high". While being input T, it becomes " low " for the " t1 " time set by the output signal / Q of the multivibrator 5-3 and the capacitor C1.

On the other hand, the output signal / Q of the multivibrator 5-3, which has become " low " for the " t1 " time, becomes " high " and is input to the multivibrator 5-4 through the AND gate 5-2. T ') and the output signal Q2 becomes " high " for the " t2 " time set by the resistor R2 and the capacitor C2.

Therefore, by setting the delay pulse time (t1) (t2) appropriately, the caption subtitle is moved to cover the caption box signal to the Hangul subtitle part during display.

As described above, the caption device of the VCR detects the vertical synchronization signal from the video signal and generates a delay pulse signal so that the caption box signal is covered up to the Korean subtitle area when displaying the caption. Discomfort in the recognition of obstacles and caption captions can be eliminated, resulting in improved reliability of the product.

Claims (2)

A low pass filter (1) for receiving video signals containing caption data from the Y / C signal processing stage and passing only low frequency components, and a caption decoder for converting and outputting box signals and character luminance signals by decoding caption data contained in video signals. (2), a synchronization signal separation unit (3) for detecting a horizontal / vertical synchronization signal from the video signal and outputting it to a caption decoder (2) and a delay pulse generator (5), and a caption subtitle signal to the video signal. A switching unit 4 for mixing, a delay pulse generator 5 for outputting the Hangul subtitle removal signal using a vertical synchronization signal, an AND gate 6 for selectively outputting the Hangul subtitle removal signal, and a caption decoder 2 And an OR gate (7) for adding the box signal and the Hangul subtitle removing signal converted and output from the subfield), and an AND gate (8) for controlling the output of the box signal and the Hangul subtitle removing signal. 2. The delay pulse generator (5) according to claim 1, wherein the delay pulse generator (5) includes an AND gate (5-1) (5-2) for trigger pulse input, a resistor (R1) (R2), and a capacitor (C1) for setting a pulse output time. A caption VCR Hangul subtitle removing device comprising (C2) and a multivibrator (5-3) (5-4) for outputting a pulse signal having a predetermined width for a set time.