JPH06326982A - Television receiver - Google Patents

Abstract

PURPOSE:To project closed caption characters in a CRT screen on a wide television. CONSTITUTION:The closed caption character display position (CRT screen display position) is determined by phase relations between a vertical synchronizing signal B for character display inputted to a closed caption circuit 6 and a vertical blanking pulse A led out from a vertical output circuit 10. A vertical synchronizing signal phase varying circuit 7 is controlled by a channel selecting microcomputer 5 to vary the phase of the vertical synchronizing signal B for character display of the closed caption circuit 6, thereby changing the closed caption character display position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver having a closed caption (text multiplex) decoder built-in, and more specifically, a phase change of a vertical sync signal for character display of a closed caption circuit to change the character. Change the display position of. Further, the present invention relates to a television receiver in which a closed caption character is always displayed on a screen of a CRT (Cathode Ray Tube) even if the vertical amplitude is varied by linking this method with the vertical amplitude varying amount.

[0002]

2. Description of the Related Art Closed Caption
On; character-based multiplex broadcasting is a broadcasting system in which a caption signal (character information) is multiplexed with a video signal to display subtitles. That is, it is a broadcasting system in which characters synchronized with the timbre are displayed on the television screen. This allows people with hearing loss to understand and enjoy TV broadcasting as well as healthy people. In order to use the character multiplex broadcasting on a television receiver, a dedicated decoder for decoding the multiplexed caption signal is required. For closed captions, see "Developing LS1 for teletext decoders,
Corresponding to the bill for built-in television in the US "(NIKKEI ELECTRONI
CS, 1991.9.30, No. 537, P149-158).

The standard aspect ratio (aspect ratio) of conventional televisions is 4: 3. But recently, H
DTO (High Definition Tv) method and EDTO (Extend
In televisions such as the ed Definition Tv system, a horizontally wide screen having an aspect ratio of 16: 9 is adopted. The "image display method" in Japanese Patent Laid-Open No. 4-192694 is based on NTSC (National Television System Com).
mittee Color System) is an image display method for displaying an image by a current television method such as a mittee color system on a television receiver with a wide aspect ratio,
When a screen based on the current television system is enlarged and displayed on a screen with a wide aspect ratio, the screen with a wide aspect ratio is fully utilized and displayed.

Conventionally, the closed caption character position is fixed, and the closed caption character is cut off in a system such as a wide TV that displays an image such as Cinesco on the entire screen of a CRT by varying the vertical amplitude.

[0005]

As described above, in the conventional wide TV system, when a closed caption character is inserted in a portion where there is no upper and lower image such as Vista size, the character is cut off outside the CRT screen. There is a problem that you cannot see it.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a television receiver having a closed caption circuit for displaying closed caption characters on a CRT screen.

[0007]

In order to achieve the above object, the present invention provides (1) a wide aspect television receiver including a closed caption decoder, wherein the closed caption decoder is a vertical synchronizing signal for character display. A vertical synchronizing signal phase varying means for character display for varying the phase is provided, and when a video signal of cinemascope size or vista size is displayed in full size, by varying the vertical synchronizing signal phase varying means for character display. The closed caption character display position is made variable, and further, (2) vertical amplitude changing means for changing the vertical amplitude of the video signal is provided, and the vertical amplitude changing means and the character display vertical synchronizing signal are provided. It is configured to display closed caption characters by interlocking with the phase variable means. It is obtained by said.

[0008]

[Function] By changing the phase of the vertical sync signal for displaying closed caption characters, the closed caption character display position can be changed.
T Do not cut off the screen. Further, the phase variable and the vertical amplitude variable amount of the closed caption character display vertical synchronizing signal are interlocked with each other so that the closed caption character always appears in the localization value on the CRT screen.

[0009]

Embodiments will be described below with reference to the drawings. FIG. 1 is a configuration diagram for explaining an embodiment of a television receiver having a closed caption circuit according to the present invention. In the figure, 1 is an antenna, 2 is a tuner, and 3 is a PIF (Picture Intermediate Frequency). Frequency) circuit, 4 video amplification / chroma circuit, horizontal / vertical synchronization circuit, 5 channel selection microcomputer, 6 closed caption decoder, 7 vertical synchronization signal phase variable circuit, 8 deflection distortion correction (vertical amplitude adjustment) circuit , 9 is a video output circuit, 10 is a vertical output circuit, 11 is a horizontal output circuit, and 12 is a CRT (Ca
thode Ray Tube), 13 is a power supply. PIF circuit 3
Performs intermediate frequency amplification and video detection. The vertical synchronizing signal phase varying circuit 7 is a variable circuit that varies the phase of the vertical synchronizing signal for character display by the tuning microcomputer 5 in order to change the character display position of the closed caption. The deflection distortion correction circuit 8 is an adjustment circuit that adjusts the deflection distortion, vertical amplitude, etc. by the tuning microcomputer 5.

The character display vertical synchronizing signal B (FIG. 2C) input to the closed caption circuit 6 and the vertical blanking pulse A derived from the vertical output circuit 10.
The closed caption character display (CRT screen display position) position is determined by the phase relationship with (FIG. 2A).
The channel selection microcomputer 5 controls the vertical synchronizing signal phase changing circuit 7 to change the phase of the character display vertical synchronizing signal B of the closed caption circuit 6 to change the closed caption character display position. On the other hand, the tuning microcomputer 5 controls the deflection distortion correction and vertical amplitude adjustment circuit 8 to change the vertical amplitude and to display the Cinesco image on the CRT.
When the vertical amplitude is adjusted by the channel selection microcomputer 5 so as to be displayed on the entire screen, if a closed caption character is inserted above or below the Cinesco image, the closed caption character is cut off from the CRT screen. Therefore, the vertical amplitude adjustment amount of the deflection distortion correction circuit 8 controlled by the channel selection microcomputer 5 and the vertical synchronization signal phase variable amount of the channel selection microcomputer 5 are linked by the channel selection microcomputer 5, whereby the vertical amplitude of the cinesco image is increased. When the image is extended and displayed on the entire CRT screen, the closed caption characters can always be displayed in the stereotactic value.

FIGS. 2A to 2F are diagrams showing the relationship between the vertical sync signal phase, the CRT screen, the image by the vertical amplitude adjustment, and the closed caption character. FIG. 7A is a diagram showing the vertical blanking pulse A, FIG. 8B is a diagram showing the position of a closed caption character according to the phase relationship of the vertical blanking pulse A in FIG.
Is a diagram showing the closed caption character display vertical synchronization signal B, and FIG. 7D is a diagram showing the position of the closed caption character according to the phase relationship of the closed caption character display vertical synchronization signal B in FIG. ), (f) are diagrams showing the relationship between the image by the vertical amplitude adjustment and the closed caption characters, FIG. (e) shows the normal screen, and FIG. (f) shows the correction screen.

In FIGS. 2A and 2B, due to the phase relationship of the vertical blanking pulse A in FIG. 2A, the inside and outside of the bottom area of the CINESCO image of the CRT screen with the screen ratio (16: 9) in FIG. Closed caption characters are displayed on. In FIGS. (C) and (d), the phase is variable in the arrow direction by 25H to 235H pulses with respect to the vertical blanking pulse A shown in FIG. As shown in (d), the display position of the closed caption character can be changed in the vertical direction. In FIGS. 7E and 7F, FIG. 8E is a normal screen in which closed caption characters are displayed outside the bottom area of the Vista image. On the other hand, in Fig. (F), the Cinesco image is displayed on the entire surface of the CRT by increasing the vertical amplitude, and the display position of the closed caption character is supposed to be cut off the screen by increasing the vertical amplitude. The phase of the vertical sync signal for displaying closed caption characters is made variable so that it can be put in the screen.

FIGS. 3 and 4A to 4H are diagrams showing the configuration of the vertical synchronizing signal phase variable circuit in FIG. 1 and the signal waveforms of respective parts. When the setting of the 3-digit decimal preset counter of IC5 is set to 150, for example, by the channel selection microcomputer, the 3-digit decimal preset counter of IC5 is reset by the rising portion of the vertical blanking pulse A and enters the counting state. At this time, the output G is "L", and therefore the signal C becomes "H", and the pulse D is derived by AND with the output B which is the inverted vertical blanking pulse A. As shown in FIG. The horizontal pulse for the period of "H" is input to the 3-digit decimal preset counter of IC5, and the output G is from "L" to "150" for the horizontal pulse of 150 pulses.
H5. At the next rising edge of the vertical blanking pulse A, IC5 is reset and the output of IC5 changes from "H" to "H".
When the H pulse becomes L ″, the L state is maintained until the next 150 H pulses are input, and when the H pulse is again input to the 150 pulse IC5, the output becomes H and this is repeated.

The pulse G has a capacitor C1 and a resistor R.
Differentiated by 1 and shaped into an appropriate pulse width through the IC 6, and supplied as a character display vertical synchronizing pulse. Therefore, set the count set value of IC5 to 25 by the tuning microcomputer.
The phase of the vertical synchronizing signal can be changed by changing the pulse up to 235H pulse.

[0015]

As is apparent from the above description, the present invention has the following effects. In order to display the image transmitted in Cinesco size etc. on the whole screen on a 16: 9 CRT etc., the closed caption character is inserted above or below the Cinesco size image on the wide TV which displays the variable vertical amplitude. In this case, the phase of the vertical sync signal for closed caption character display is changed to change the character display position, and the display position variable and vertical amplitude variable are interlocked so that this displayed character is not cut by the vertical amplitude variable. Since the caption characters are not cut off from the screen, wide TV (16: 9 CRT
When an image such as Cinesco size is displayed on the entire screen on the TV used), all the closed caption characters can be seen.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of a television receiver according to the present invention.

FIG. 2 is a diagram showing a relationship between a vertical sync signal phase, an image by a CRT screen and vertical amplitude adjustment, and a closed caption character in the present invention.

FIG. 3 is a configuration diagram of a vertical synchronizing signal phase variable circuit according to the present invention.

FIG. 4 is a diagram showing a signal waveform of each part in FIG.

[Explanation of symbols]

1 ... Antenna, 2 ... Tuner, 3 ... PIF circuit, 4 ... Image amplification chroma circuit, horizontal / vertical synchronization circuit, 5 ... Tuning microcomputer, 6 ... Closed caption decoder, 7 ... Vertical synchronization signal phase variable circuit, 8 ... Deflection Distortion correction (vertical amplitude adjustment) circuit, 9 ... video output circuit, 10 ... vertical output circuit, 1
1 ... Horizontal output circuit, 12 ... CRT (CathodeRay Tub
e), 13 ... Power supply.

Claims (2)

[Claims] 1. A wide aspect television receiver incorporating a closed caption decoder, wherein the closed caption decoder comprises character display vertical sync signal phase varying means for varying the phase of the character display vertical sync signal, When full-size display of a video signal of Cinesco size or Vista size, the closed caption character display position can be changed by changing the vertical synchronizing signal phase changing means for character display. Television receiver. 2. A closed caption character is displayed by providing vertical amplitude changing means for changing the vertical amplitude of the video signal, and by changing the vertical amplitude changing means and the character display vertical synchronizing signal phase changing means in conjunction with each other. The television receiver according to claim 1, wherein the television receiver is configured as follows.