JPH09266567A - Television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an on-screen display of a closed caption and an on-screen display except the closed caption easy to see. SOLUTION: A closed caption detection part 4 detects whether or not there is a closed caption signal on a television signal. A CCD 3 extracts and decodes the closed caption signal on the television signal. An on-screen signal generation part 6 generates an on-screen signal of character information other than the closed caption such as a channel number and a timer. A control part 5 and the on-screen signal generation part 6 display data other than the closed caption at 6 specific position on the screen of a display part 7 unless the closed caption signal is detected even when a mode for displaying the closed caption on the screen is set through an input part 8.

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 decoder for decoding a closed caption signal transmitted from a broadcasting station into a video signal.

[0002]

2. Description of the Related Art There are roughly two types of closed caption display modes. First, as shown in FIG. 6, in a part of the screen, a caption mode (shown in FIG. 10) in which the sound output from a television receiver (hereinafter, also simply referred to as a television) is displayed in real time in a subtitle supermarket. The second is a text mode in which the entire background screen is almost completely covered as shown in FIG. The text mode is 1
It is an optional feature by the US Federal Communications Commission (FCC) regulations on April 12, 991.

The information on this closed caption is
21H (H is a horizontal scanning period) of the vertical blanking period in the first field F1 of the television signal or 21 of the vertical blanking period in the second field F2.
H (284H). Each of the information transmitted in the first field F1 and the second field F2 has two data channels C1 and C2. At present, broadcasting using the data channel C1 of the first field F1 is widely carried out in North America, and this closed caption signal is used for TVs of 13-inch or more released after July 1, 1993. It is mandatory to have a built-in decoder for decoding.

Generally, this closed caption
Television receivers with a built-in decoder (CCD) are as follows: -Display mode selection (display on [caption mode / text mode] or display off) -field switching (F1 or F2) -channel switching (C1 or C2) It is selectable by the user, and the caption mode or the text mode, the field F1 or F2, the channel C1 or C2 is decoded according to the function selected by the user, and the on-screen signal is output.

Further, as another on-screen display of a television receiver, there is generally known one which displays information such as a channel number set by a user as shown in FIG. 6 (shown in FIG. 12). . By the way, this 2
When system on-screen display is performed at the same time, these are combined and output, but the output positions on the screen overlap depending on the type of output. So, as a conventional method,
For example, as shown in Japanese Unexamined Patent Publication No. 4-271688, when the caption character information displays 10 and 11 and the caption character information display 12 overlap, the caption character information displays 10 and 11 are prohibited, and the caption character information displays other than the caption are prohibited. There has been proposed a method of giving priority to the display 12 of the character information.

However, when the display 12 of the character information other than the caption is prioritized, the display 10 and 11 of the character information of the caption are lost. Therefore, in order to solve this problem, the display ON function of the caption mode / text mode is selected. If it is already displayed, the display position of the character information other than the closed caption that is expected to overlap with the closed caption character information display 10 and 11 is moved in advance (in caption mode), and displayed in a few seconds. It is conceivable to erase (in the case of text mode).

[0007]

However, in the above method, when the display-on function of the caption mode / text mode is selected, the display position of the character information other than the closed caption is moved or the display is erased. However, there is a problem that the display position of the character information other than the caption moves or the display disappears even though there is no closed caption signal (not broadcast), and as a result, it is very difficult for the user to see.

In view of the above problems, it is an object of the present invention to provide a television receiver capable of easily displaying on-screen display of closed caption and on-screen display other than closed caption.

[0009]

In order to achieve the above object, the present invention detects whether or not a closed caption signal is inserted in a vertical blanking period of a television signal and displays the closed caption on the screen. Even when the display mode is set, the data other than the closed caption is displayed at a predetermined position on the screen when the closed caption signal is not detected. That is, according to the present invention, a decoder for decoding a closed caption signal inserted in a vertical blanking period of a television signal, and a setting for setting whether to display the closed caption decoded by the decoder on the screen Means, detection means for detecting whether or not a closed caption signal is inserted in the vertical blanking period of the television signal, and a mode for displaying closed caption on the screen by the setting means. In addition, when the closed caption signal is not detected by the detecting means, the data other than the closed caption is displayed at a predetermined position on the screen, and when the closed caption signal is detected, the data is displayed at a predetermined position on the screen. Control not to A television receiver and a control means is provided. Further, when the caption mode is set and the closed caption signal is detected, the data other than the closed caption is moved from the display position of the closed caption. In addition, when the text mode is set and the closed caption signal is detected, the data other than the closed caption is erased from the screen.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a block diagram showing an embodiment of a television receiver according to the present invention, FIG. 2 is a flow chart for explaining on-screen display processing other than closed captioning of the television receiver of FIG. 1, and FIG. FIG. 4 is an explanatory view showing a screen only displaying a clock, FIG. 4 is an explanatory view showing a screen displaying a closed caption display and a clock display in the caption mode, and FIG. 5 is a closed caption display and a clock display in the text mode. It is explanatory drawing which shows a screen.

FIG. 1 shows only the video signal reproduction system, and the audio signal reproduction system is omitted in the figure. The image receiving unit 1 receives and demodulates a television signal transmitted from a broadcasting station, and outputs a video signal to the display signal generating unit 2, the CCD 3 and the closed caption detecting unit 4. Under the control of the control unit 5, the CCD 3 extracts and decodes the closed caption signals on the television signals 21H and 284H and outputs them to the display signal generation unit 2. Here, the closed caption signal inserted on the 21H and 284H by the broadcasting station is the character code and its display position (row and column).
And colors are shown. Further, this display position is, for example, 15 lines × 3 so as to cover almost the entire screen in the text mode.
Two characters, 12th to 15th in caption mode
Be a line.

The closed caption detector 4 detects whether or not there is a closed caption signal on the television signals 21H and 284H, that is, whether or not the closed caption signal is transmitted from the broadcasting station, and detects the detection. The result is applied to the control unit 5. The on-screen signal generator 6 generates an on-screen signal of character information other than closed captions such as a channel number and a clock under the control of the controller 5, and outputs it to the display signal generator 2.

The display signal generating section 2 synthesizes the video signal from the image receiving section 1, the on-screen signal of the closed caption from the CCD 3 and the on-screen signal from the on-screen signal generating section 6 other than the closed caption. R, G, and B display signals are generated and output to the display unit 7. The display unit 7 is composed of a CRT or the like, and displays an image according to the display signal from the display signal generation unit 2 on the screen.

The input unit 8 is composed of, for example, an infrared remote controller, and a user inputs a code to select a display mode (display on [caption mode / text mode] or display off) and field switching (F1 or F1).
2) Select a function to select on-screen display of closed caption for channel switching (C1 or C2) and a function to select on-screen display of character information other than closed caption such as channel number and clock. Then, the input code is applied to the control unit 5. When the closed caption display ON mode is selected via the input unit 8 and the field F1 or F2 and the channel C1 or C2 are selected, the control unit 5 performs the decoding process by the CCD 3 to perform the on-screen signal. Is output to the display signal generator 2.

Next, referring to FIG. 2 to FIG.
The on-screen display processing other than the caption will be described. In step S1 shown in FIG. 2, the control unit 5 waits for a code input from the input unit 8, and when the code input occurs, it is determined whether or not the display ON code is the caption mode / text mode (step S2). And not the display on code of caption mode / text mode,
If, for example, a clock display code is selected as a display other than the closed caption, the OSD (on-screen display) setting for the on-screen signal generation unit 6 is displayed character: 7:00 PM Display position: lower right ( Fifteenth line) Display time: set as steady (steps S3 and S8). Based on this setting, the on-screen signal generator 6 sets the characters "7:00
An on-screen signal such that "PM" is displayed in a "steady state" in the "lower right (15th line)" of the screen is generated and output to the display signal generation unit 2.

On the other hand, in the case of the display on code of the caption mode / text mode in step S2,
The presence / absence of a closed caption signal is determined based on the detection result of the closed caption detection unit 4 (step S4). If there is no closed caption signal, the process proceeds to step S3. Therefore, even when the mode for displaying the closed caption on the screen is set as shown in FIG. 3, when the closed caption signal is not detected, the characters "7: 00P" are displayed.
“M” is displayed in a “steady state” at the “lower right (15th line)” on the screen.

On the other hand, in step S4,
If there is a caption signal, it is determined whether it is the caption mode or the text mode (step S5). In the caption mode, the display character: 7:00 pm, the display position: upper left (first line), the display time: the on-screen signal generator 6 is controlled to generate an on-screen signal such as steady (step). S6, S8). Therefore, as shown in FIG. 4, the character “7:00 PM” is displayed in the “steady state” at the “upper left (first line)” of the screen, and the closed caption 10 does not overlap with the twelfth to the twelfth characters. Displayed in line 15.

In the case of the text mode in step S5, the display character: 7:00 pm, the display position: the lower right (the 15th line), the display time: 5 sec, etc. The section 6 is controlled (steps S7 and S8). Therefore, as shown in FIG. 5, in the first 5 seconds, the closed caption 11 in the text mode is the first to the fifteenth.
In the 15th line, the characters "7: 00P"
"M" is displayed with priority, and after 5 seconds, the characters "7:
"00 PM" is erased and closed caption 11
Only displayed.

[0019]

As described above, according to the present invention, even when the mode for displaying the closed caption on the screen is set, when the closed caption signal is not detected, a signal other than the closed caption is detected. Since the data is displayed at the predetermined position on the screen, the on-screen display of the closed caption and the on-screen display other than the closed caption can be easily displayed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a television receiver according to the present invention.

FIG. 2 is a flowchart for explaining on-screen display processing other than closed captioning of the television receiver of FIG.

FIG. 3 is an explanatory diagram showing a screen displaying only a clock.

FIG. 4 is an explanatory diagram showing a screen on which closed caption display and clock display are performed in a caption mode.

FIG. 5 is an explanatory diagram showing a screen on which closed caption display and clock display are performed in the text mode.

FIG. 6 is an explanatory diagram showing a caption mode in a conventional closed caption mode.

FIG. 7 is an explanatory diagram showing a text mode in a conventional closed caption mode.

[Explanation of symbols]

1 Image Receiving Section 2 Display Signal Generating Section 3 Closed Caption Decoder (Decoder) 4 Closed Caption Signal Detecting Section (Detecting Means) 5 Control Section (Constituting Display Control Means with On Screen Signal Generating Section 6) 6 On Screen Signal Generator 7 Display 8 Input (setting means)

Claims (3)

[Claims] 1. A decoder for decoding a closed caption signal inserted in a vertical blanking period of a television signal, and a setting means for setting whether to display the closed caption decoded by the decoder on a screen. A case in which a detecting unit that detects whether or not a closed caption signal is inserted in the vertical blanking period of the television signal and a mode in which the closed caption is displayed on the screen are set by the setting unit. When the closed caption signal is not detected by the detecting means, the data other than the closed caption is displayed at a predetermined position on the screen, and the data is not displayed at the predetermined position on the screen when the closed caption signal is detected. Display control hand to control A television receiver having a step. 2. The display control means closes data other than closed caption data when a caption mode is set by the setting means and a closed caption signal is detected.
The television receiver according to claim 1, wherein the television receiver is moved from the display position of the caption. 3. The display control means erases the data other than the closed caption from the screen when the text mode is set by the setting means and the closed caption signal is detected. The television receiver according to claim 1 or 2.