JP2000175116A - Television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display at least two image screens or over on a TV screen and to control a V-chip on the entire displayed image screens. SOLUTION: The television receiver that has a function of dividing and displaying a composite video signal obtained by detecting an RF signal 10 and an external composite video signal being an external input signal 20 as signals for a plurality of image screens on a monitor screen, is provided with a changeover switch 116 that selects a video signal displayed on a major screen and a video signal displayed on a sub screen on the basis of a control signal outputted from the video signal for the main screen, and a control signal for view limit having been inserted for a vertical blanking period of the main screen and the sub screen is retrieved from an output of the changeover switch 116 and the display of the main screen and the sub screen is controlled on the basis of the retrieval result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a V-chip provided with a viewing-restriction control signal in a vertical blanking period of a video signal, the control signal being capable of restricting viewing of a picture that is not desired to be shown (violent or sexual). The present invention relates to a television receiver having a function of displaying a plurality of screens on a screen.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a main part of a conventional television receiver.
A tuner for converting the F signal 10 into an intermediate frequency signal,
Reference numeral 01 denotes a detection circuit that converts an intermediate frequency signal output from the tuner 100 into a composite video signal. Reference numeral 102 denotes a composite video signal output from the detection circuit 101 and an external composite video signal that is an external input signal 20 input from the outside. A first changeover switch for switching, 103 is a first changeover switch.
R, G, and R, which are suitable for displaying a composite video signal of the main screen output from the changeover switch 102 on the CRT 107.
This is a video processing circuit that converts the signal into a B signal or a Y, RY, or BY signal and adds an addition such as contrast and sharpness.

A PIP circuit 104 processes a sub-screen composite video signal output from the first changeover switch 102 into a reduced video, and 105 denotes a video processing circuit 103.
, A third switching switch for superimposing a sub-screen signal output from the PIP circuit 104 on the main screen signal output from the CIP 107; a drive circuit 106 for amplifying the output of the third switching switch 105 so that the CRT 107 can be driven; , 10
Reference numeral 8 denotes a microcomputer for transmitting and receiving a control signal to and from each circuit.

In FIG. 3, when a user receives a channel selected, tuning data for receiving the selected channel is output from the microcomputer 108 to the tuner 100, and the tuner 100 outputs the selected channel. Is output to the detection circuit 101.

[0005] The intermediate frequency signal output from the tuner 100 is demodulated by a detection circuit 101 into a composite video signal containing an audio carrier, and thereafter, a composite video signal from which the audio carrier has been removed by an audio trap is generated.

The composite video signal output from the detection circuit 101 is input to a first switch 102. On the other hand, a composite video signal is input to the first switch 102 from outside. The user can select the output of the detection circuit 101 if the user wants to watch a television, or can select the external input composite video signal if the user wants to view a video such as an external video.
From 8, a switching signal is output to the first switch 102, and the first composite switch 102 outputs the selected composite video signal to the video signal processing circuit 103.

The composite video signal output from the first switch 102 is also output to the microcomputer 108. The microcomputer 108 detects the control signal for parental control of the V chip superimposed in the vertical blanking period of the video signal, and uses the level of the extreme frequency of the V chip as an OSD signal to generate a PIP circuit 104 shown in FIG. 4th in
To the changeover switch 114. The user can prevent the user from viewing the corresponding program or an external video signal based on the extreme frequency of the V chip.

On the other hand, when it is desired to generate two screens on a screen,
For example, when the main screen and the sub-screen are used as in PIP,
A control signal is output from the microcomputer 108 to the first changeover switch 102 to generate the sub-screen, and the first change-over switch 102 outputs the composite image signal selected as the sub-screen to the PIP circuit 104.

FIG. 4 shows a detailed diagram of the PIP circuit 104. As shown in FIG.
In FIG. 4, reference numeral 109 denotes an A / A that converts an input composite video signal from an analog signal to digital data.
A D converter 110 extracts a color component digital data from the digital data output from the A / D converter 109 and outputs a luminance signal digital data and a color signal digital data to a memory 111.
11 is a memory for storing digital data, 112 is R, R,
Matrix circuit for generating G and B digital data;
13 converts R, G, B digital data into analog R, G,
A D / A converter 114 for converting into a B signal, a fourth switch 115 for switching the R, G, B signals of the output of the D / A converter 113 and an OSD signal from the microcomputer 108 by a control signal of the microcomputer 108; Is a memory controller for writing and reading digital data necessary for generating a sub-screen.

A composite video signal output from the first changeover switch 102 is converted from an analog signal to digital data by an A / D converter 109, and then a chroma decoder 110 extracts only digital data as a color signal. Then, digital data of only a luminance signal component and digital data of only a chrominance signal component are generated. The memory controller 115 writes digital data obtained by thinning out data in the vertical direction to the memory 111, not every 1H period of data corresponding to the size of the screen designated as the sub-screen.

At the time of reading, since the horizontal video period is short in the sub-screen, the reading is performed at a higher reading frequency than the writing frequency of the memory 111. The independent digital data of only the luminance signal component and only the chrominance signal component read from the memory 111 is generated as R, G, and B digital data by the matrix circuit 112. The R, G, B digital data output from the matrix circuit 112 is converted by the D / A converter 113 into analog R,
The G and B signals are restored.

The R, G, and B signals output from the D / A converter 113 are output to a fourth switch 114. An OSD signal is output from the microcomputer 108 to the fourth changeover switch 114, and the control signal of the microcomputer 108 switches between a video signal and an OSD signal.

The video processing circuit 103 converts the composite video signal serving as a main screen into R, G, and B signals after adding processing such as contrast and sharpness to the composite video signal.
The R, G, and B signals converted by the video processing circuit 103 are output to the third switch 105. In the third changeover switch 105, in order to superimpose the sub-screen on the main screen,
The video processing circuit 10 is controlled by the control signal of the microcomputer 108.
The R, G, and B signals of the output of No. 3 and the R, G, and B signals of the output of the PIP circuit 104 are switched.

R of the output of the third changeover switch 105,
The G and B signals are amplified by the drive circuit 106 so that the CRT 107 can be driven, and then displayed as images on the CRT 107.

[0015]

Conventionally, when a parental control signal such as a V chip is inserted in a vertical blanking period of a video signal, and at least two
When displaying more than the screen, the microcomputer can determine the vertical blanking period of only one system of the video signal, and thus can control the V chip only on the main screen.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to display at least two or more screens on a screen and to control a V chip on all the displayed screens. The purpose is to do.

[0017]

A television receiver according to the present invention has a function of dividing and displaying a first composite video signal and a second composite video signal on a screen. And a switching means for switching between a video signal serving as a first screen and a video signal serving as a second screen, and from an output of the switching means during a vertical blanking period of the first screen and the second screen. The inserted parental control signal is searched, and the display of the first screen and the second screen is controlled based on the search result.

The switching of the video signal by the switching means is performed in units of the number of frames.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a main configuration of a television receiver according to the present invention. 10, 20, 100 to 107, and 109 to 115 are the same as those in FIG. I do. In FIG. 1, reference numeral 116 denotes a first switch 1
Means for switching between the composite video signal (first composite video signal) of the main screen (first screen) and the composite video signal (second composite video signal) of the sub-screen (second screen), which is the output of the second 02 Is a second changeover switch. Although the figure shows an example of one sub-screen, when there are a plurality of sub-screens, composite video signals of the main screen and all sub-screens are switched. 117 is a microcomputer, and 118 is a switch control signal.

In FIG. 1, a first changeover switch 102
Is output to the video processing circuit 103 and also to the second changeover switch 116. Further, a composite video signal corresponding to the sub-screen output from the first switch 102 is also output to the PIP circuit 104 and also to the second switch 116.

The microcomputer 117 is connected to the second changeover switch 11
The control is performed in response to the signal switched by step 6. The 2 which is now input to the second switch 116
The composite video signal of the system is, for example, as shown in FIG.
If switching is performed every 150 frames, the microcomputer 117 can search for control data for the vertical blanking period of the main screen and the sub-screen every 150 frames. The display of the main screen and the sub-screen can be controlled by the signal. The switching of the second switch 116 is performed based on a control signal output from a video signal of the main screen.

As described above, by providing the second changeover switch capable of changing over the screens that can be displayed on the screen, and since the second changeover switch changeover signal is made in frame units, a plurality of screens to be displayed is displayed. V chip control can be performed.

Embodiment 2 FIG. In the first embodiment, the signal of the main screen is a TV signal and the signal of the sub-screen is an external input signal. However, the signal of the main screen and the sub-screen is either a TV signal or an external input signal. Is also good.

Embodiment 3 FIG. Further, in the first embodiment, the PIP has been described as an example. However, the present invention is not limited to this, and it is sufficient if a plurality of screens are displayed on a screen.

Embodiment 4 In the first embodiment, the cycle of the second switch signal is set to 1
Although the number of frames is 50, the number is not limited to this and may be any number. Further, the switching cycle does not need to be in units of the number of frames, but may be any set time.

[0026]

As described above, according to the present invention, by providing the changeover switch for changing the screen display on the screen, the V chip for the entire screen of the main screen and the sub-screen is provided with a simple configuration. Control can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of a television receiver according to Embodiment 1 of the present invention.

FIG. 2 is a waveform chart illustrating an operation of the first embodiment.

FIG. 3 is a block diagram illustrating a configuration of a main part of a conventional television receiver.

FIG. 4 is a block diagram showing a configuration of a general PIP circuit.

[Explanation of symbols]

10 RF signal, 20 external input signal, 100 tuner, 101 detection circuit, 102 first changeover switch, 103 video processing circuit, 104 PIP circuit, 105 third changeover switch, 106 drive circuit,
107 CRT, 109 A / D converter, 1
10 chroma decoder, 111 memory,
112 matrix circuit, 113 D / A converter, 114 fourth changeover switch, 115
Memory controller, 116 second changeover switch, 117 microcomputer, 118 switch control signal.

Claims (2)

[Claims] 1. A television receiver having a function of dividing and displaying a first composite video signal and a second composite video signal on a screen, the video signal having the first screen and the second Switching means for switching between the video signal as the screen of the first screen and a control signal for parental control inserted in the vertical blanking period of the first screen and the second screen from the output of the switching means. A television receiver, wherein display of the first screen and the second screen is controlled based on a search result. 2. The television receiver according to claim 1, wherein the switching of the video signal by the switching means is performed in units of frames.