JP3019032U - TV with built-in teletext broadcasting decoder - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a television with a built-in text multiplex decoder that solves the problem that a part of an image is hidden by a caption display and becomes difficult to see when receiving text multiplex broadcasting. [Composition] When receiving a character multiplex broadcast, the display screen of the CRT 5 is compressed and its position is shifted to create an opening on the screen of the CRT 5, and the decoded character information is displayed on-screen in this opening. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a television having a built-in decoder corresponding to a character multiplex broadcasting (closed caption) system that multiplexes character (caption) information into a video signal and displays a subtitle on a screen.

[0002]

[Prior art]

 Conventionally, in character multiplex broadcasting (closed caption), characters synchronized with voice are displayed on the screen of a picture tube such as a television CRT, and the decoder decodes the caption character information multiplexed with the video signal. However, the television screen and the caption text information are superimposed and displayed on the picture tube.

[0003]

[Problems to be solved by the device]

 However, in TVs that support the conventional closed caption system described above, a black curtain is created on the image at the bottom of the screen, and white characters are displayed in this black curtain. Part of is hidden. Therefore, when receiving closed captions, it was difficult to see the video. The present invention has been made in order to solve the above-mentioned problems, and when a closed caption, that is, a character multiplex broadcast is received, an image displayed on a picture tube is compressed and shifted to form an image screen. An object of the present invention is to provide a television with a built-in text multiplex decoder that displays character information (captions) without overlapping and eliminates the problem that part of the video is hidden due to the caption display, making it difficult to see. .

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the device of claim 1 extracts character information from a video signal in a television having a built-in decoder corresponding to a character multiplex broadcasting system that multiplexes character information into a video signal and displays a subtitle on a screen. Then, at the time of receiving the character decoder and the decoder for decoding, the horizontal synchronizing signal and the vertical synchronizing signal obtained from the video signal are timed to generate an image display signal corresponding to the character information obtained by the decoder, Image display signal processing means for imposing the image display signal outside the display area of the television image by the picture tube, horizontal deflection and vertical deflection means for the light beam of the picture tube, and on the picture tube when receiving the character multiplex broadcast. The vertical screen and the position control means for varying the vertical output waveform of the vertical deflection means so that the display screen is compressed and its position is shifted. By compressing the display screen on the picture tube by means of the position and position control means and shifting the position, the character information based on the signal processed by the image display signal processing means is displayed on-screen on the picture tube. It is the one. Further, in the television with a character multiplex broadcast decoder according to a second aspect of the present invention, in the configuration according to the first aspect, the vertical size and position control means compresses the height of the vertical deflection voltage synchronized with the vertical synchronizing signal, Moreover, it raises the DC component level of the vertical deflection voltage.

[0005]

[Action]

 In the television with a built-in multiplex character broadcasting decoder having the above structure, when receiving the multiplex character broadcasting, the character information is extracted and decoded by the decoder from the video signal, and the image display signal corresponding to the obtained character information is obtained. Is generated by the image display signal processing means in time with the horizontal synchronizing signal and the vertical synchronizing signal obtained from the video signal, and the image display signal is superimposed outside the display area of the television image by the picture tube. It Then, by changing the vertical output waveform of the vertical deflection means of the picture tube to compress the display screen on the picture tube and shift the position, the character information is displayed on the screen of the picture tube as a television image. Display on-screen without overlapping the screen. Further, in the television with built-in character multiplex broadcast decoder according to claim 2, when the character multiplex broadcast is received, the height of the vertical deflection voltage synchronized with the vertical synchronizing signal is compressed, and the DC component level of the vertical deflection voltage is increased. By this, the display screen on the picture tube is compressed, and its position is shifted upward, so by imposing the character information signal below the display area of the TV image by the picture tube, It is possible to display the text information on the screen of the TV screen on the lower side of the video screen without overlapping the TV video screen.

[0006]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a television having a built-in decoder for a closed caption system (hereinafter referred to as CCS) that performs character multiplex broadcasting. The television 1 is an antenna 2 for receiving television broadcast radio waves, a tuner 3, an intermediate frequency amplifier circuit 4, and the core of the image display signal processing means, and is for displaying television images on a picture tube (CRT) 5. The image signal processing circuit 6 for generating various signals, the horizontal deflection and vertical deflection circuit 7 for controlling the light beam of the picture tube 5 according to the image signal, and the character information from the television broadcast radio wave in which the character information is multiplexed. And a character signal processing circuit 8 for decoding and generating an image display signal corresponding to the character information.

The image signal processing circuit 6 includes a separation circuit 11 that separates a luminance (Y) signal and a color (C) signal from a television signal, a horizontal synchronization signal (H.SYNC), and a vertical synchronization signal (V.SYNC). ), And a mixing (MIX) circuit 13 for performing signal processing for on-screen display of a television image based on the Y signal and the C signal and decoded character information described later on the CRT 5. Have The MIX circuit 13 imports the character information signal to the outside (lower side) of the display area of the television image by the CRT 5, and the image displayed on the CRT 5 based on the output of the character information signal is displayed by the vertical deflection circuit 7 as described later. By compressing and shifting by the action, the television image and the character information are displayed on-screen on the screen of the CRT 5 without overlapping each other.

The character signal processing circuit 8 is composed of a microcomputer or the like, has a CCS decoder 14 that extracts and decodes character information from a video signal, and a ROM that stores the character information. The OSD circuit 15 for on-screen display, the CCS ON / OFF circuit 17 that operates in response to a command from the switch 16 that turns the CCS reception on and off, and the CRT 5 displays according to the output of the circuit 17. It has a level changing circuit 18 and a high / low (H / L) circuit 19 for outputting a signal for compressing and shifting a television image to be generated.

The OSD circuit 15 uses the red (R), green (G), blue (B) signals and the character display timing reference corresponding to the character information decoded in time with H.SYNC and V.SYNC. And outputs a blanking (BL) signal to the MIX circuit 13. The MIX circuit 13 outputs R, G, B signals to the cathode amplifier 21 which controls the CRT 5. The horizontal deflection and vertical deflection circuit 7 operates by receiving the outputs of the horizontal deflection control circuit 22 and the vertical deflection control IC (vertical deflection means) 23 to which H.SYNC and V.SYNC are input, and the screen display on the CRT 5 is performed. To control.

Further, the level change circuit 18 outputs a level change signal for compressing the image screen of the CRT 5 to the V-size controller (vertical size control means) 24 when receiving the character multiplex broadcast, and receives this. Then, the V-size controller 24 changes the vertical output waveform with respect to the vertical deflection control IC 23, and specifically, compresses the height of the vertical deflection voltage synchronized with the vertical synchronizing signal. At the same time, the slope of the sawtooth wave may be loosened. Further, the high / low (H / L) circuit 19 outputs an H signal for shifting the display position of the video screen on the CRT 5 upward to the V-position controller (position control means) 25 when receiving the character multiplex broadcast. In response to this, the V-position controller 25 operates so that the vertical deflection control IC 23 raises the DC component level of the vertical deflection voltage. By compressing and vertically shifting the vertical size of the video screen on these CRTs 5, the character information from the OSD circuit 15 which is superimposed on the lower side of the screen in the MIX circuit 13 enters the display area of the CRT 5, It is designed to be displayed on-screen.

Next, the operation of the television with built-in CCS decoder 1 of the present embodiment configured as described above will be described with reference to FIG. 2A to 2C are diagrams showing the state of the video signal and the CRT display screen in this embodiment, and FIG. 2D is the diagram showing the state of the conventional video signal and the CRT display screen. Is. As shown in FIG. 2A, a part of the video signal is usually in a region that is not displayed on the CRT, that is, a non-visible region. When the television 1 according to the present embodiment receives a character multiplex broadcast (closed caption) with the CCS ON / OFF switch 16 turned on, the CCS decoder 14 of the character signal processing circuit 8 extracts CCS character information. Then, the OSD circuit 15 generates an image signal corresponding to the character information, and the MIX circuit 13 of the image signal processing circuit 6 mixes this with the video signal. At this time, as shown in FIG. 2B, the image signal of the character information is superimposed on the lower side of the video area.

Further, at the time of receiving the character multiplex broadcast, the V-size controller 24 compresses the height of the vertical deflection voltage synchronized with the vertical synchronizing signal in the vertical deflection control IC 23 to compress the image screen on the CRT 5, and , V-position controller 25 raises the DC component level of the vertical deflection voltage in vertical deflection control IC 23 and shifts the display position of the video screen on CRT 5 upward. By compressing and shifting the screen in this way, as shown in FIG. 2C, the character information is displayed below the screen of the CRT 5 without overlapping the television image. In the conventional CRT screen shown in FIG. 2D, the CCS information is superimposed on the TV image, and a part of the TV image is hidden by the CCS information and is difficult to see. According to, such problems are solved.

In the above embodiment, the normal CRT 5 screen display is performed when not the character multiplex broadcasting or when the CCS ON / OFF switch 16 is OFF. Also, the signal in the lower part of the television image area may be erased to be black, and the character information may be displayed in white here. Further, the present invention is not limited to the configuration of the above-described embodiment, and various modifications can be made. For example, the character information may be displayed above the screen or on the left and right sides.

[0014]

[Effect of device]

 As described above, according to the television with built-in character multiplex broadcasting decoder according to the invention of claim 1, when the character multiplex broadcasting is received, the image display signal of the character information is superimposed outside the display area of the television image by the picture tube, The display screen on the picture tube is compressed, and its position is shifted so that the text information is displayed on-screen on the screen without overlapping the TV image. It will not be hidden and difficult to see. Also, according to the television with a character multiplex broadcast decoder according to the invention of claim 2, when the character multiplex broadcast is received, the height of the vertical deflection voltage synchronized with the vertical synchronizing signal is compressed, and the DC of the vertical deflection voltage is reduced. By increasing the minute level, the display screen on the picture tube can be compressed and its position can be shifted upward, and the character information is displayed on the screen of the picture tube without overlapping the TV image. It is possible to obtain the same effect as above.

[Brief description of drawings]

FIG. 1 is a block diagram of a television with a character multiplex broadcast decoder according to an embodiment of the present invention.

2A, 2B, and 2C are diagrams showing a screen display state according to the present embodiment, and FIG. 2D is a diagram showing a conventional screen display state.

[Explanation of symbols]

 1 television 5 picture tube (CRT) 6 image signal processing circuit (image display signal processing means) 7 horizontal deflection and vertical deflection circuit 8 character signal processing circuit 14 CCS decoder 15 OSD circuit 18 level changing circuit 19 high / low circuit 23 vertical deflection Control IC (vertical deflection means) 24 V-size controller (vertical size control means) 25 V-position controller (position control means)

Claims (2)

[Scope of utility model registration request] 1. In a television having a built-in decoder corresponding to a character multiplex broadcasting system for multiplexing character information on a video signal and displaying a subtitle on a screen, a decoder for extracting and decoding the character information from the video signal, and a character multiplex At the time of broadcast reception, an image display signal corresponding to the character information obtained by the above-mentioned decoder is generated by synchronizing the timing with the horizontal synchronization signal and the vertical synchronization signal obtained from the video signal, and the image display signal is transmitted to a television image by a picture tube. Image display signal processing means for imposing outside the display area, horizontal deflection and vertical deflection means for the light beam of the picture tube, the display screen on the picture tube is compressed when the character multiplex broadcast is received, and And a vertical size and position control means for varying the vertical output waveform of the vertical deflection means so that the position is shifted, the vertical size and position control By compressing the display screen on the picture tube by the step and shifting the position, the character information based on the signal processed by the image display signal processing means is displayed on-screen on the picture tube. A TV with a built-in text multiplex decoder. 2. The vertical size and position control means compresses the height of the vertical deflection voltage synchronized with the vertical synchronization signal and raises the DC component level of the vertical deflection voltage. Item 1. A television with a character multiplex broadcast decoder according to item 1.