JPH066766A - Character broadcasting display system - Google Patents

Abstract

PURPOSE:To execute the scroll display of characters on a display part (such as an electric display board constituted of LEDs) constituted of an aligned display by extracting character broadcasting signals and filling blanks formed on the head and end of each line with characters. CONSTITUTION:A tuner part 1 demodulats a television(TV) broadcasting signal or the like into a composite video signal, a character extracting part 2 extracts a character broadcasting signal, an error correction part 3 corrects an error, and a memory part 4 records the corrected result. The record of the memory part 4 is read out through a control part 12, a decoding part 5 decodes the read data to a required character signal and a character processing part 7 rearranges character signals judged to be displayed on a display part 11 by a character judging part 6 in the order of display and records the rearranged result in a storage part 8. The recorded character signals are read out through the control part 12, blanks on the head and end of each line are detected by a blank detection part 9, the number of blanks is judged by a blank judging part 10, and the blanks are filled with characters based upon the judged result. Then the filled lines are transferred to a display memory in a display part 11 and read out in the order of display and displayed so as to be scrolled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for displaying a teletext received from a television broadcast or the like, and more particularly to a system for scrolling the blank space when the blank digit is present at the beginning or end of the line.

[0002]

2. Description of the Related Art A teletext broadcast superimposed on a television broadcast signal or the like is usually considered in view of a fixed screen of each page displayed on a screen of a television receiver or the like. Arrangement of characters is performed. Therefore, for example, a line may be broken at a break of a sentence and a space may be left blank up to the next line. When such a character broadcast is scroll-displayed on a display board using an LED (light emitting display element) installed on the street such that the display capacity (the number of characters) of one screen is limited, the blank is used. Since the display is cut off at the part, it is frustrating for the viewer, it is not continued even if there is a continuation, or when inserting a promotional text etc. between the text broadcasting, this advertising text is long Problems such as not being able to see etc. occur.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a scrolling display in which, when there is a blank space equal to or larger than a set number of characters at the beginning or end of each line of teletext, the blank spaces are filled. Especially.

[0004]

In order to solve the above problems, the present invention receives a television broadcast or the like, extracts a character broadcast signal superimposed on a composite video signal, and decodes it into a character signal for display. A character broadcast signal extraction / decoding unit for outputting, a character determination unit for determining a displayable character signal or the like from the decoded character signal, and a character processing unit for rearranging the character signals determined by the character determination unit in the display order. , A storage unit for recording a signal from the character processing unit, a margin detection unit for detecting a margin of a character by the signal read from the storage unit, a margin determination unit for determining a signal from the margin detection unit, and a character signal And a control unit for controlling the character broadcast signal extraction / decoding unit, the character determination unit, the character processing unit, the storage unit, the margin detection unit, the margin determination unit, and the display unit. Based on the signal from the department Packed margins of characters read from the storage unit Te, there is provided a teletext display system configured to display the transferred to the display unit.

[0005]

With the above construction, in the teletext display system according to the present invention, the teletext signal of the composite video signal received from the television broadcast or the like is extracted and subjected to error correction or the like, and then the LED After extracting the characters that can be displayed on the display unit configured by etc. and rearranging them in the display order when displaying on the fixed display screen, if there is more than the required number of characters at the beginning or end of each line, remove these spaces. Packing and transfer to the display unit in order of display and scroll display.

[0006]

Embodiments of the teletext display system according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of essential parts of an embodiment of a teletext display system according to the present invention. In the figure, reference numeral 1 denotes a tuner section that receives a television broadcast or the like, demodulates it into a composite video signal, and outputs it. Two
Is a character extraction unit that extracts a character broadcast signal superimposed in the vertical blanking period from the composite video signal demodulated by the tuner unit 1. An error correction unit 3 corrects the error of the teletext signal extracted by the character extraction unit 2. Reference numeral 4 denotes a memory unit for recording the teletext signal from the error correction unit 3. A decoding unit 5 decodes the teletext signal read from the memory unit 4 into a required text signal. A character determination unit 6 determines a character signal or the like that can be displayed on the LED or the like of the display unit 11 based on the character signal decoded by the decoding unit 5. A character processing unit 7 rearranges the character signals determined by the character determination unit 6 in the order of display. Reference numeral 8 is a storage unit for recording the character signal from the character processing unit 7. A blank space detector 9 detects blank spaces at the beginning and end of each line based on the character signal read from the storage unit 8. Ten
Is a blank space determination unit that determines a blank space for one character or more based on a signal from the blank space detection unit 9. A display unit 11 performs processing such as blank filling on the character signal read from the storage unit 8 based on the signal from the blank space determination unit 10 and displays the character signals in the display order by an LED or the like. A control unit 12 controls each unit.

Next, the operation of the teletext display system according to the present invention will be described with reference to an example of the teletext screen of FIG. 2 and the flowchart of FIG. The television broadcast signal on which the teletext signal is superimposed is input to the tuner unit 1, received and demodulated, and a composite video signal is output. This composite video signal is input to the character extraction unit 2 and the character broadcast signal superimposed in the vertical blanking period is extracted. The character broadcast signal extracted by the character extraction unit 2 is error-corrected by the error correction unit 3 and recorded in the memory unit 4 (step 1, hereinafter abbreviated as ST1). The signal recorded in the memory unit 4 is read out via the control unit 12 and input to the decoding unit 5 to be decoded into a desired character signal (ST
2). The decoded character signal is input to the character determination unit 6 to determine a character or the like that can be displayed on the LED display plate of the display unit 11. In this determination, for example, when the LED or the like emits a single color, the color information of the decoded character signal, the control information (designation of the display position), or the like is cut. Character determination unit 6
The character signal determined by the
Are input to the storage unit 8 via the control unit 12 and recorded (ST).
3). The recorded signals are, for example, a character signal group displayed on the screen of the television receiver as shown in FIG.

The character signal recorded in the storage unit 8 is transferred to the control unit.
It is read line by line via 12 and input to the margin detection unit 9,
Detect leading and trailing margins. The signal from the blank space detection unit 9 is input to the blank space determination unit 10 to determine the number of blank spaces on the left and right of each row, as shown in FIG. 2B. That is,
First, the first line is read out via the control unit 12, and if there is a blank space (left blank space) at the beginning of the line, this blank space is filled (ST4, left margin = 0 in the example in the figure) and displayed via the control unit 12. The data is transferred to the section 11 and recorded in a required buffer memory or the like (ST5). Then, the margin detection unit 9 detects the margin (right margin) at the end of the first line, and the margin determination unit 10 determines the number of margins of the size of the last character of the line (if the last character is a standard character, the standard size margin). If 1 is 1, it is counted as 1, if it is a medium-sized character, it is counted as 1 if the margin of the medium-sized character size is 1), and if it is 2 or more (ST6: Yes), 1 is calculated from the number of blanks. Subtract and temporarily store the remainder (ST7).

Next, the next row is read from the storage unit 8 (ST
8) When the margin detection unit 9 detects the margin at the beginning of the line, inputs the detection signal to the margin determination unit 10, and detects the margin of the character size at the beginning of the line (ST9: Yes, the same as the margin at the end of the line). (Determination), the number of blanks is added to the number of blanks stored in ST7 (ST10), and when the total value is 2 or more, blank 1 is left and blanking processing is performed (ST11), and the result is transferred to the display unit 11. Recording is performed in the buffer memory after the previous recording (ST12). If there is no blank space at the beginning of ST9 (ST9: No),
The character signal of the line is transferred to the display unit 11 (ST13), and the data stored in ST7 is erased. If the character signal recorded in the storage unit 8 has the next line (ST13: No), the above ST6
The subsequent operations are repeated. If there is a next page (ST
14: No), proceed to the next page (ST15) and repeat the above ST4 and subsequent steps.

The character signals recorded in the buffer memory of the display unit 11 are sequentially read out at a required speed based on the signal from the control unit 12 and transferred to the display memory. For example, LEDs arranged in a horizontal row. Scroll display on the display board.
In the above description, only the margins at the beginning and end of the line are processed, but it is also possible to detect the margins between the characters in a line and perform the trimming process when the number of required margins is exceeded.

[0011]

As described above, according to the teletext display system of the present invention, a character or the like that can be displayed by an LED or the like is extracted from a teletext signal extracted from a television broadcast signal or the like, and the beginning or end of a line is extracted. Since the scroll display is performed by closing the blank space, it is possible to display the character information without interruption when it is displayed in a limited display area, such as a display plate having a vertical single row or horizontal single row configuration. .

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of an embodiment of a teletext display system according to the present invention.

FIG. 2 is an example of a teletext screen.

FIG. 3 is a flowchart for explaining the operation of the teletext display system according to the present invention.

[Explanation of symbols]

 1 tuner section 2 character extraction section 3 error correction section 4 memory section 5 decoding section 6 character determination section 7 character processing section 8 storage section 9 margin detection section 10 margin determination section 11 display section 12 control section

Claims (1)

[Claims] 1. A teletext signal extraction / decoding unit which receives a television broadcast or the like, extracts a teletext signal superimposed on a composite video signal, decodes it into a text signal for display, and outputs it, and a decoded character. A character determination unit that determines a character signal that can be displayed from the signal, a character processing unit that rearranges the character signals determined by the character determination unit in the display order, and a storage unit that records the signal from the character processing unit, A blank space detection unit that detects a blank space of a character by a signal read from the unit, a blank space determination unit that determines the signal from the blank space detection unit, a display unit that displays based on the character signal, and the above-mentioned character broadcast signal extraction / decoding Unit, a character determination unit, a character processing unit, a storage unit, a blank space detection unit, a blank space determination unit, and a control unit for controlling the display unit, the blank space of the character read from the storage unit based on the signal from the blank space determination unit. On the display Teletext display system configured for transfer and display.