JPH0965231A - Teletext broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a teletext broadcast superimposed on a video signal without being hidden by providing a teletext broadcast decoding means changing a write position of a content of a teletext broadcast program to a display memory at the detection of an EDTVII signal to the receiver. SOLUTION: A teletext broadcast decoding section 20 decodes a teletext signal. When a program form of a program is a superimposed dialogue program from a program data header in program data and display mode control is conducted by a program for superimpose display, both the programs are superimposed on a video image demodulated a video signal processing circuit 50 under the control of a display control section 40. When an EDTVII circuit 70 detects it that a video signal (a) is an EDTVII signal, data are written in an address of a display memory 30, that is an address subtracting a prescribed offset from a Y coordinate of a picture drawing command of a teletext broadcast. The superimposed dialogue program is displayed at a location where the information is moved as a whole. Or a reciprocal of a magnification magnified by a deflection circuit 60 is multiplied with the Y coordinate and a coordinate offset by a prescribed value is written in a memory 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teletext receiver for changing the display position of a subtitle program / superimpose program when an EDTVII signal is detected.

[0002]

2. Description of the Related Art In recent years, the widespread use of wide-screen televisions with an aspect ratio of 19: 6 has been remarkable, and in the future EDTVII
Wide TV compatible with broadcasting is expected to spread.

An example of a conventional teletext receiving apparatus will be described below with reference to the drawings. In FIG. 10, a is a video signal of a television, 10 is a character signal extracting section for extracting a character signal superimposed in the vertical blanking period from the video signal a, and 20 is a display memory 30 for decoding the extracted character signal. It is a teletext decoding unit that writes display data to. Reference numeral 50 is a TV video signal processing circuit for demodulating the video signal a. Reference numeral 70 denotes an EDTVII detection circuit that determines whether the video signal a is an EDTVII signal.
Reference numeral 0 is a deflection circuit for vertically enlarging the image by the output of the EDTVII detection circuit 70. The display control circuit 40 is a display control unit that displays the contents of the display memory 30 according to the synchronization signal generated by the deflection circuit 60.

FIG. 2 shows a display area drawn by a teletext program. FIG. 3 shows an example of the display memory.
FIG. 5 shows the structure of the program data header of the extracted teletext, FIG. 5 shows the structure of the program data header in the program data, and FIG. 6 shows the structure of the page data header in the program data.

The character signal extracting portion 10 from the input video signal a is 4H, 15H, 16H, 2 during the vertical line erasing period.
The character signal superimposed on 1H is extracted. The teletext decoding unit 20 decodes a text signal. The drawing instruction included in the teletext program data has coordinates (0,
0) to (247, 203), so
For example, if a display memory in which one dot is expressed by 4 bits is configured, one line in the horizontal direction can be configured by 256 bytes as shown in FIG. 3, and if the start address of the display memory is 0000, the final address will be (CBFF). . here,
In the program data, when b4 of the program form data at the position of DB14 of the program data header of FIG. 5 is 1, the program is a subtitle program, and the display mode of the position of DB16 of the page data header of FIG. When the control b5 is 1, the program is a superimpose instruction, and both programs are superimposed on the video demodulated by the TV video signal processing circuit 50 by the display control unit 40 and displayed on the CRT. Further, the EDTVII circuit 70 outputs the video signal a to EDTVII.
When the signal is detected as a signal, the deflection circuit 60 enlarges the image so that the range of the main image portion (53 / 316H to 232 / 495H) in FIG. 7 is filled on the CRT.

[0006]

However, in the above configuration, as shown in FIG. 7, the video signal a is EDTVI.
When the drawing instruction is made to the position where the I signal and the subtitle of the teletext are displayed at the position of the non-picture part, the video is enlarged in the vertical direction by the deflection circuit 60. Therefore, the subtitle broadcast is performed as shown in FIG. It had the problem of becoming invisible.

In view of the above problems, the present invention provides a means for displaying a subtitle program / super program of a teletext superimposed on a video signal which is an EDTVII signal without turning over.

[0008]

SUMMARY OF THE INVENTION There is provided a teletext decoding means for changing the writing position of the content of a teletext program to the display memory when an EDTVII signal is detected.

[0009]

The present invention has the above-described structure and is based on the EDTVII.
The subtitle program can be seen even when a drawing instruction is made at a position where the subtitle of the teletext is displayed as a signal at the position of the non-picture part.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A teletext receiver according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a teletext receiver according to an embodiment of the present invention.

In FIG. 1, a is a television video signal,
Reference numeral 10 is a character signal extracting section for extracting a character signal superimposed on the video signal a during the vertical blanking period, and 20 is a character broadcast decoding section for decoding the extracted character signal and writing display data in the display memory 30. Reference numeral 50 is a TV video signal processing circuit for demodulating the video signal a. Reference numeral 70 denotes an EDTVII detection circuit that determines whether or not the video signal a is an EDTVII signal, and reference numeral 60 is a deflection circuit that vertically expands an image by the output of the EDTVII detection circuit 70. The display control circuit 40 is a display control unit that displays the contents of the display memory 30 according to the synchronization signal generated by the deflection circuit 60.

The operation of the teletext receiving apparatus configured as described above will be described below. In FIG. 1, a teletext decoding unit 20 decodes a text signal. The drawing instruction included in the teletext program data is in the range of coordinates (0, 0) to (247, 203) shown in FIG. 2. Therefore, for example, if a display memory that represents 1 dot by 4 bits is configured. As shown in Fig. 3, one horizontal line is 25
It can consist of 6 bytes, and the start address of the display memory is 00.
When it is 00, the final address is (CBFF). Here, among the program data, DB1 of the program data header of FIG.
When b4 of the program form data at the position of 4 is 1,
The program is a subtitle program, and when b5 of the display mode control at the position of DB16 in the page data header of FIG. 6 is 1, it is a superimpose instruction program. The image demodulated by the signal processing circuit 50 is superimposed and displayed on the CRT. Here, the video signal a is EDT in the EDTVII circuit 70.
When the VII signal is detected, the data is written to the address of the display memory 30 at a position where a constant offset is subtracted from the Y coordinate of the drawing instruction of the teletext. As a result, as shown in FIG. 9, the subtitle program / superimpose instruction program is displayed on the CRT at the place where the information is moved to the whole. Alternatively, when the EDTVII signal is detected, the Y coordinate of the teletext display instruction is multiplied by the reciprocal of the enlargement ratio to be enlarged by the deflection circuit, and the display memory 3 of the coordinate with a constant offset is provided.
Write data to address 0.

[0014]

As described above, according to the teletext receiving apparatus of the present invention, the character signal extracting means, the EDTVII signal detection circuit, and the deflection circuit for vertically enlarging the image in accordance with the output of the EDTVII detection circuit. A display memory, display control means for extracting and displaying the contents written in the display memory according to a synchronizing signal generated by the deflection circuit, and decoding the teletext signal extracted by the character signal extracting means. By providing the teletext decoding means for changing the writing position of the content of the teletext program to the display memory when the EDTVII signal is detected, E
The subtitle program can be seen even when the drawing instruction is made at the position where the subtitle of the teletext is displayed at the position of the non-picture part with the DTVII signal.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of a character display area

FIG. 3 is an explanatory diagram of a display memory

FIG. 4 is an explanatory diagram of a program data structure of teletext.

FIG. 5 is an explanatory diagram of a program data header

FIG. 6 is an explanatory diagram of a program page header

FIG. 7 is a diagram showing correspondence with a screen of an EDTVII signal including subtitle broadcasting.

FIG. 8 is a diagram showing a screen display mode of an EDTVII signal including subtitle broadcasting.

FIG. 9 is a display mode diagram for explaining an effect of one embodiment of the present invention.

FIG. 10 is a block diagram of a conventional teletext receiver.

[Explanation of symbols]

 10 Character Signal Extraction Section 20 Teletext Decoding Section 30 Display Memory 40 Display Control Section 70 EDTVII Detection Circuit 60 Deflection Circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location H04N 7/03 7/035

Claims (5)

[Claims] 1. A character signal extracting means, an EDTVII signal detection circuit, a deflection circuit for vertically enlarging an image according to the output of the EDTVII detection circuit, a display memory, and contents written in the display memory. EDTVII signal detection is provided with display control means for extracting and displaying in accordance with a synchronizing signal generated by the deflection circuit, and character broadcast decoding means for decoding the character broadcast signal extracted by the character signal extracting means and writing it in the display memory. A teletext receiver, wherein the teletext program contents are sometimes written by changing the writing position in the display memory. 2. The teletext receiver according to claim 1, wherein the content of the closed caption program is written in a position of the display memory which is displayed at an upper position on the CRT when the EDTVII signal is detected. 3. The content of a program having a superimpose instruction of a character broadcast when an EDTVII signal is detected is written in a position of the display memory which is displayed at an upper position on a CRT. Teletext receiver. 4. The teletext receiving apparatus according to claim 1, wherein the writing position of the content of the subtitle program of the teletext to the memory is changed according to the enlargement ratio of the video when the EDTVII signal is detected. 5. The teletext receiving apparatus according to claim 1, wherein the writing position of the contents of the program for which the superposition of the teletext is instructed to the memory when the EDTVII signal is detected is changed according to the enlargement ratio of the video. .