JPH0564099A - Television receiver with built-in telop display circuit - Google Patents

Abstract

PURPOSE:To prevent telop display and sign display, when equipments are operated, from superimposing each other by providing a sign signal generating means, a sign signal generation instructing means, a control means and a display means. CONSTITUTION:When a telop signal is demodulated by a telop demodulating means 4 and a telop is displayed by superimposing a screen, operating a sound volume button, etc., makes telop display disappear and signs such as VOL display, are displayed, instead, by superimposing a screen. After a specified time is passed or when operating an sound volume button, etc., completes, a sign will disappear and the telop demodulating means 4 outputs a telop signal so as to display a telop by superimposing a screen again. While a telop is not displayed, a display means (CRT) 15 displays this condition so as to permit a sign to be displayed. So, a telop and a display sign will not superimpose each other and the display quality on the screen is kept.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver with a built-in caption display circuit for demodulating a digitized caption signal and displaying the caption signal by superimposing it on the display screen of the television signal. ..

[0002]

2. Description of the Related Art Conventionally, in the United States, a subtitle signal-containing broadcast called a line 21 system has already been performed, and VCR tapes containing subtitle signals have been sold. A decoder is required to reproduce such a subtitle signal, but the currently available decoders display the subtitle in black and white.

FIG. 3 is a block diagram of such a decoder. A television signal containing a caption signal selected by the tuner 1 is amplified and detected by an intermediate frequency amplification and detection circuit 2 and taken out as a composite signal containing a caption modulation signal. .. This composite signal is guided to the caption demodulation circuit 3,
After being demodulated to a white character / black background signal, it is superimposed on the image signal by the superimposing circuit 4, and further the RF modulating circuit 5
Is subjected to RF modulation and is taken out as an RF output.
Then, this RF modulation output is connected to the antenna terminal of the television receiver 6 and is displayed with the subtitles superimposed on the television image.

In the line 21 system, a character, a display position, a signal for each color of the character, etc. are sent, and the character of the subtitle can be displayed in seven colors composed of red, blue and green.

[0005]

In the above-mentioned conventional apparatus, when the subtitle demodulation circuit is activated and the subtitles are superimposed and displayed on the screen, when the volume control or the like is performed by the remote controller or the like, the display screen is displayed. A signature display A such as a VOL display appears, and as shown in FIG. 4, it overlaps with the caption B and becomes very difficult to see. In particular, if the sign output A and the caption output B have the same color, the composite output C on which these are superimposed does not take the form of the sign and caption, and there is a problem that the display quality is significantly impaired.

[0006]

In order to solve the above problems, the present invention demodulates a digitized subtitle signal and displays the demodulated subtitle signal on a color television receiver. In a color television receiver having built-in caption demodulation means for outputting R, G, B signals, signature signal generation means for generating a plurality of signature signals, and signature signal generation instruction means for instructing generation of a predetermined signature signal. , A control means for stopping the output of the caption demodulation means during the generation period of the sign signal, and a display means for indicating that the caption signal is supplied even during the period during which the output of the caption demodulation means is stopped. Configure

[0007]

According to the above configuration, when the caption signal is demodulated by the caption demodulating means and the caption is displayed in a superimposed manner on the screen, when the volume button or the like is operated, the caption display disappears, and instead the VOL is displayed. Signs such as displays are superimposed on the screen. When the operation of the volume button or the like is finished after a predetermined time has passed, the above-mentioned sign disappears, the caption signal from the caption demodulating means is output, and the caption is displayed again on the screen. Then, in order to perform the signature display, while the subtitle display is off, it is displayed by the display means.

[0008]

FIG. 1 is a block diagram of an embodiment of the present invention. In FIG. 1, 1 is a tuner, 2 is an intermediate frequency amplification and video detection circuit, 3 is an input switching circuit for switching the composite signal from the intermediate frequency amplification and video detection circuit 2 or the external video input terminal T, and 4 is a caption demodulation circuit. A subtitle demodulation unit composed of 5 and an on-screen output circuit 6, 7 is a chroma amplifier demodulation circuit, 8 is a video amplification circuit, and 9 is a sync separation circuit.

On the other hand, 10 is a channel selection microcomputer, and the channel selection microcomputer 10 is driven by a signal received by an R / C receiver 12 from an instruction from a remote control (R / C) transmitter 11. A caption indicator 13 indicates that the caption signal is being received. Reference numeral 14 denotes the color signals R-Y, G-Y, and B-Y from the chroma amplifier demodulation circuit 7, the luminance signal Y from the video amplification circuit 8, and the on-screen output circuit 6.
It is a signal mixing circuit for outputting the combined R, G, B signals of the subtitle information from the channel selection signal and the R, G, B signals of the sign information from the channel selection microcomputer 10 to the display device 15.

Now, a composite video signal including a caption signal coded from the antenna via the tuner 1 and the intermediate frequency amplification and video detection circuit 2 or via the external video input terminal T is input to the caption demodulation section 4. .. When the viewer wants to see subtitles, for example, by pressing the subtitle button on the remote control (hereinafter referred to as R / C) transmitter 11,
A signal is output from the R / C transmitter 11 and the R / C receiver 12
Is received in the channel selection microcomputer 10, the signal processing is performed, and the terminal of the channel selection microcomputer 10 and the terminal are "L".
To "H", the caption demodulation circuit 5 and the caption indicator 13 are put into operation.

The subtitle demodulation circuit 5 demodulates the type of character, the position of the character, the color of the character, etc. from the encoded subtitle signal and inputs them to the on-screen output circuit 6. The on-screen output circuit 6 synchronizes with the vertical and horizontal sync signals V and H from the sync separation circuit 9 and sends a predetermined character signal to R, G and B.
Output as a signal. The R, G, B signals of the subtitles are mixed by the video signal Y from the video amplifier 8 and the color signals (RY, G-Y, BY) from the chroma amplifier demodulation circuit 7 by the signal mixing circuit 14. Subtitle characters are displayed on the CRT 15.

When any key operation such as volume adjustment is performed in the subtitle display state, the sign output terminal of the tuning microcomputer 10 and the display sign related to the operation are output as R, G, B signals. Therefore, when the caption is being displayed, the display sign and the caption are mixed by the signal mixing circuit 14, and there is a possibility that the display screen of the CRT 15 cannot be discriminated from each other. In order to prevent this, the tuning microcomputer 10 performs a process of temporarily stopping the display of subtitles by the program shown in FIG.

As an example of key input, it is assumed that the volume UP key is pressed. As shown in the program of FIG. 2, first, at step 10, confirmation processing is performed as to whether or not the caption demodulation switch is ON. Y if the subtitle demodulation switch is ON
ES, subtitle demodulation switch terminal (channel selection microcomputer 10
The terminal) is turned off (“L”) to erase the subtitles on the CRT 15 (step 20 in FIG. 2). Then step 3 in FIG.
As shown in 0, wait for the subtitles to disappear,
After the subtitle disappears, the volume U as shown in step 40 of FIG.
Display the sign of P. Then, the volume UP control command is executed in step 50 of FIG. 2, and then the display sign at the time of volume UP is erased in step 60 of FIG.

Next, in step 70 of FIG. 2, it is confirmed whether the output to the caption indicator 13 at the terminal of the channel selection microcomputer 10 is ON or OFF. If the output to the subtitle indicator 13 is ON, the result is YES, and the ON / OFF switch of the subtitle demodulation circuit 5, that is, the terminal of the channel selection microcomputer 10 is turned on to automatically restore the operation of the subtitle demodulation circuit 5 and perform the subtitle display again. .. When the viewer turns off the subtitle button of the R / C transmitter 11, the confirmation process of the subtitle demodulation switch becomes through.

[0015]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, when a device such as volume control is operated while a subtitle is displayed and a display sign corresponding to this operation is displayed, the subtitle is displayed. Since the display is temporarily stopped during the display period of the display sign, the subtitle and the display sign are not superimposed and displayed, and the display quality of the screen is not impaired.
Further, since the indicator is displayed while the subtitles are temporarily not displayed, it can be confirmed that the subtitle signal is being received.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart used to explain the operation of the present invention.

FIG. 3 is a block diagram of a conventional example.

FIG. 4 is an operation explanatory view of a conventional example.

[Explanation of symbols]

 4 Subtitle demodulation unit 5 Subtitle demodulation circuit 10 Tuning microcomputer 13 Subtitle indicator

Claims (1)

[Claims] 1. In order to demodulate a digitized caption signal and display the demodulated caption signal on a color television receiver, a caption demodulating means for outputting the caption signal as R, G, B signals is incorporated. In a color television receiver, a sine signal generation means for generating a plurality of sine signals, a sine signal generation instruction means for instructing generation of a predetermined sine signal, and an output of the caption demodulation means during a sine signal generation period. A television receiver with a built-in caption display circuit, comprising: a control means for stopping the display and a display means for indicating that the caption signal is being supplied even while the output of the caption demodulation means is stopped.