KR100284893B1 - Digital television character zoom device - Google Patents

Abstract

The present invention relates to a digital television having a teletext function.

When receiving a text broadcast from a digital television, it is common to display a text on an OSD screen after processing a television video screen.

The present invention provides a character zoom device of a digital television capable of enlarging a character of a desired portion by a viewer's operation during character broadcasting of a digital television.

In a television having a teletext function, a character decoder for receiving and demodulating a character broadcast signal received with a video signal, a character size control unit for controlling a character size of a portion designated by a viewer, and a position for displaying a specified character are controlled. And a microcomputer for applying a control signal to each of the position control unit.

Description

Character zoom device of digital television

The present invention relates to a character processing apparatus for digital television with a character broadcasting function. In particular, the present invention relates to a text zoom apparatus for digital television capable of enlarging and displaying a portion designated by a viewer among characters output through a screen.

The teletext function of a television uses 4H in a line other than the lines used for VITS and GCR signals during the 10H to 21H vertical retrace period of the television as digital signals. It is a system that receives various service information such as news, business, weather forecast, stocks, entertainment, shopping, etc. by using a character broadcasting adapter or a TV receiver with a character decoder.

A schematic configuration of the teletext television is shown in block diagram in FIG. An antenna 1 for receiving component signals transmitted by multiplexing the text information with the video signal, a tuner unit 6 for tuning the received signal and performing demodulation after high frequency amplification, and amplifying and amplifying the audio signal. A demodulator (2), a video audio switching unit (3) for separating and processing the video signal and the audio signal, a voice amplifier (4) for amplifying the audio signal output from the video audio switching unit (3), A speaker 5 for outputting audio, a video color signal processor 8 for processing color signals of the video signal output from the video audio switching unit 3, an RGB processor 9 for processing color signals, and a video signal RBG output section 10 for processing to display by CRT 11, and character signal decoder 7 for separating and decoding text signals from the tuner section 6, respectively.

The character signal decoder 7 detects a character signal from the demodulated video signal of the television receiver, decodes the data, reproduces the character screen, and converts it into an RGB signal. In addition, additional sound information is also processed and converted into a voice signal using an electronic sound generator.

Such teletext televisions have a front fixed display for freezing characters or figures on the full screen of a television display, a superimposed fixed display for superimposing with a television image, a subtitle display for displaying a caption of a video, landscape or portrait. Display mode of scroll display to be displayed while scrolling, color display to add color to characters or figures, concealment to hide characters, display to output flickering and electronic sound to make certain characters or figures flicker. Can be.

However, the conventional text broadcasting technology is displayed in the size of the character determined by the receiver in spite of the various display modes and display functions described above, so it is possible to pass an important part of the text without seeing it.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide a character zoom device capable of enlarging the character size of a portion selected by a viewer among the character information displayed on a teletext digital television. .

As a technical idea for achieving the object of the present invention, a character signal decoding means for detecting and decoding a character signal from a component signal transmitted by multiplexing a character signal to a television video signal, and a position to display a character or the like on a display unit. A position control means for controlling the control, a size control means for controlling the enlargement of the vertical and horizontal size of the data output from the text signal decoding means and a control means for controlling the processing of the first means.

1 is a schematic block diagram of a telecaster.

2 is a hierarchical structure diagram for a data packet of a text broadcasting signal.

Fig. 3 is a block diagram of an embodiment of the character zoom device of the digital television of the present invention.

4 is a detailed block diagram of an essential part of the present invention of FIG.

5 is a state diagram displaying characters enlarged by the operation of the present invention.

<Description of the symbols for the main parts of the drawings>

1,100: antenna 2: voice demodulation amplifier

3: video audio conversion unit 4: audio amplification unit

5,105: Speaker 6,101: Tuner

7, 114: character decoder 8: image color signal processor

9: RGB switching unit 10,109: RGB output unit

11,110: CRT 102: Image Intermediate Frequency Processing Unit (PIF)

103: voice signal processing unit 104: voice output unit

106: A / D converter 107: digital signal processing unit

108: D / A converter 111: remote control receiver

112: micom 113: memory

200: operation signal processing unit 201: position control unit

202: size control unit 300: display unit

301: character output unit 302: zoom character

Hereinafter, with reference to the accompanying drawings for the configuration and operation of the embodiment of the present invention will be described in detail.

2 is a schematic block diagram of an embodiment of the invention.

An antenna (100) for receiving a composite video signal transmitted from a transmitting station and a character broadcast signal multiplexed therein; a tuner unit (101) for tuning and outputting the component signal by amplifying and outputting the component signal; and the tuner unit (101). PIF (102) for amplifying and detecting the video signal received from the video signal, a voice signal processing unit (103) for signal processing for removing color signals from an audio signal, and amplifying the audio signal and outputting it to the speaker (105). A voice output unit 104, a text signal decoder 114 for detecting and decoding a text broadcast signal from the PIF 102, and A for converting a video signal received from the PIF 102 into a digital signal. / D converter 106 and the digital image signal output from the A / D converter 106, digital data processing at the same time while receiving the character data output from the text signal decoder 114 to control the position And A digital signal processor 107 for controlling the child size, a memory 113 for temporarily storing the digital video signal processed by the digital signal, and a D / A converter 108 for converting the digital video signal into an analog video signal. ), An RGB output unit 109 for performing color signal processing on the analog video signal and outputting it to the CRT 110, a remote control receiver 111 for receiving a remote control signal of a viewer, and a microcomputer for controlling the entire system. It consists of 112.

The teletext digital television having the above configuration is a digital signal obtained by sampling the received analog composite video signal at a predetermined interval by the A / D conversion unit, quantizing the sampled diskette signal into a numerical value, and encoding the binary code. Converted to PCM signal and stored in the memory 113, and then controlled by the microcomputer 112 and the digital signal processor 107, Y / C separation, non-interlace (Non-interlace), noise reduction operation, such as various digital processing After decoding, the D / A converter 108 decodes the analog signal and outputs an image signal to the CRT 110.

Sampling and quantization processing performed by the A / D converter 106 to convert an analog video signal into a digital signal is one example. The sampling number per scan line (1H) of the television signal is based on the sampling principle of fsc per 1H. The sampling rate per 1H is calculated by 4 times or 4 times the fsc, resulting in 910 samples / line.

The number of samples per screen is 910 samples / line x 525 copies = 477,750 samples / frame. If an 8-bit A / D converter is used to quantize, the sample value is 2 ⁸ = 256 resolutions, and an 8-bit encoded digital signal. Is stored in memory. Therefore, the memory capacity per frame is 477,750 x 8 bits = 3.822 Mbit / frame.

The character broadcast signal received by the character signal decoder 7 transmits the character information using the 4H of the vertical retrace period as a packet in the 1H unit at the transmitting side, and the packet in the 1H unit is called a data packet. As an example of a data packet, a synchronization part is composed of 24 bits (3 bytes) and data part 272 bits (34 bytes) in total of 296 bits (37 bytes). The synchronization part consists of a clock run-in (CR) for bit synchronization and a synchronization code FC (Framing Code) for byte synchronization. The 14-bit PFX (Prefix) of the data part identifies a pattern type or a hybrid type. It consists of a service identification unit (SI) and a PC (Packet Control) for controlling the transmission of data packets. Furthermore, characters, graphics, and additional sound data encoded as 176-bit data block dms information data, and codes for controlling them, and an error correcting code (CRC) are added.

3 is a hierarchical structure diagram of the data packet. 3, layer 1 (e) is a transmission path, layer 2 (d) is a data line, layer 3 (c) is a data packet, layer 4 (b) is a data group, and layer 5 is a profile.

The digital signal processing unit 107 receives the video signal data of the digital data of the structure decoded from the character signal decoder 114, expands the size of the specified character, and performs control for determining the position to be displayed.

4 is a block diagram of an embodiment of a zoom device of the digital text data. The character signal decoder 114 controlled by the microcomputer 112, the arithmetic signal processor 200 also controlled by the microcomputer 112, and the position control unit for determining a position on the CRT 110 to display the character signal. And a digital signal processing unit 107 including a size control unit 202 for enlarging the character size.

In the position control unit 201, the entire area where the video signal of the television can be displayed is from the scan line 21, but in general, the area displaying the characters or figures is designated from the scan line 44 to the scan line 238. The position where the character is to be placed is determined in this range and controlled to be displayed.

Displaying OSD characters on the screen forms the screen as a blank background and displays the characters. In general, the size of a character is generally determined by a 12 × 18 dot pattern in the character ROM. The character size control unit 202 performs digital signal processing to increase the number of dots in the rows and columns of the character pattern. If there is an enlargement command, the control is performed to enlarge the number of dots of a predetermined row and column, and the microcomputer 112 displays the OSD control signal by applying an OSD control signal to an OSD processor not shown.

FIG. 5 is an example in which a character to be enlarged by a viewer is enlarged and displayed at a predetermined position in the displayed character broadcasting of the present invention.

A method of designating a portion to be enlarged by the viewer can be selected for each character line, and a specific portion can be selected as shown in FIG. Install a remote control to perform a kind of mouse function used by a computer wirelessly, and when you press the mouse key, the cursor is created on the screen, and if you move the remote control while pressing the mouse key, the cursor moves in reverse direction along the trajectory of the cursor movement. Is displayed. In this case, pressing the zoom key on the remote control may be configured to enlarge and display the characters of the selected portion at a specific position.

As described above, the present invention provides a character signal decoding means for detecting and decoding a character signal from a component signal transmitted by multiplexing a character signal to a television video signal, and a position control for controlling a position to display a character on a display. A digital television having a teletext function by presenting a configuration comprising a means, an enlargement control means for enlargedly controlling the vertical and horizontal sizes of data output from said text signal decoding means, and a control means for controlling the processing of said first means. When the character broadcast is displayed, the specific part can be enlarged and displayed according to the viewer's choice, thereby realizing high quality television corresponding to the taste of the viewer by diversifying the functions of the digital television.

Claims (2)

In a digital television having a teletext function, Text signal decoding means for detecting and decoding a text signal from a component signal transmitted by multiplexing the text signal to a television video signal; Position control means for controlling a position at which the character or the like is displayed on the display unit; And a control means for controlling the processing of said means and the size control means for enlargedly controlling the vertical and horizontal sizes of the data output from said text signal decoding means. The character zoom device according to claim 1, wherein said size control means performs digital signal processing for increasing the number of dots of rows and columns of a character pattern.