JPH1056649A - Double screen television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep definition in any screen by providing an output selector circuit capable of displaying a signal from which residual flicker interference is removed by a three-dimensional Y/C separating means onto any screen when displaying an S terminal signal on the left or right screen. SOLUTION: The S terminal signal from which a luminance signal and a chrominance signal are separated is supplied from an M/N converter 104 for converting a MUSE signal to an NTSC signal. Since a video signal selected by a 1st input selecting means 111 is Y/C separated by a three-dimensional Y/C separating means 121, when the S terminal signal is supplied, the flicker interference residual at a still picture section can be easily removed. A video signal selected by a 2nd input selecting means 112 is Y/C separated by a glass comb Y/C separating means 122. Respective luminance signals Y1 and Y2 and chrominance signals C1 and C2 are guided to 1st and 2nd output selecting means 131 and 132. Since the output selecting means 131 and 132 can switch left and right pictures corresponding to the instruction of a remote control 137, two screens can be displayed on both the left and right screens without impairing the definition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-screen television receiver for simultaneously displaying two different kinds of screens on the same display device. Provided is a dual-screen television receiver that can be displayed on a TV.

[0002]

2. Description of the Related Art Recently, high quality television broadcasts such as MUSE and EDTV have been developed and put to practical use. This high-definition television broadcast uses a 16: 9 wide screen wide screen, and a display device such as a 16: 9 wide screen display CRT has been developed and put into practical use. Two-screen television receivers that can simultaneously display two different screens in addition to a high-quality screen using the wide-screen display device have been rapidly popularized.

[0003] This dual-screen television receiver is generally
A method of displaying a main screen on the left side and a sub-screen on the right side on the left side of the center of a display device such as a cathode ray tube is used for two different types of screens.

As a specific configuration of this dual-screen television receiver, as shown in FIG. 2, for example, a first tuner 201 and a second tuner 202 for selecting an NTSC television broadcast, a television signal is recorded and reproduced. Video cassette tape recorder 203 (hereinafter referred to as video input 203),
And a MUSE-NTSC converter 204 (hereinafter referred to as M-
N converter 204), and the first tuner 20 among these signal sources.
1. Video input 203 and M-N converter 204
Are connected to a first input selection means 211 for selecting a video signal for the main screen, and a second tuner 202, a video input 203, and an MN converter 204 select a video signal for the sub-screen. Each of them is connected to the second input selecting means 212. The first and second input selection means 21
Reference numerals 1 and 212 allow a user to select a desired video signal from the connected signal sources. For example, when the video signal selected by the first tuner 201 is selected by the first input selection unit 211, the second input selection unit 212
Selects one of the second tuner 202, the video input 203, and the MN converter 204. Also, the first input selection unit 211 uses the M-N converter 20
4 is selected, the second input selecting means 212
Of the tuner 202 or the video input 203 is selected.

The first input selection means 211 is connected to a mixing matrix means 217 via a three-dimensional Y / C separation means 213 and a video signal compression means 215 for a left screen (main screen). The video signal selected by the first input selection unit 211 is separated into a luminance signal and a color difference signal by a three-dimensional Y / C separation unit 213, and the separated luminance signal and color difference signal are converted into a left screen video signal. The data is compressed in the horizontal time axis direction by the compression means 215 and supplied to the mixing matrix 217 as a left screen video signal.

Next, the second input selecting means 212
It is connected to the mixing matrix means 217 via the C separating means 214 and the video signal processing means 216 for the right screen (sub-screen). The video signal selected by the second input selection means 212 is separated by a Y / C separation means into a luminance signal and a chrominance signal, and the separated luminance signal and chrominance signal are separated into a right screen video signal compression means 216. , And is supplied to the mixing matrix means 217 as a right screen video signal.

The video signals for the left and right screens supplied to the mixing matrix means 217 are mixed and matrixed to generate a luminance signal (Y) and color signals (R, G, B).
The image is output to the cathode ray tube 218 as a display means, and the image selected by the first input selection means 211 is displayed on the left screen, and the image selected by the second input selection means 212 is simultaneously reproduced and displayed on the right screen.

[0008] In such a two-screen television receiver,
When separating the luminance signal and the color difference signal from the video signal,
Using a frame memory for the still image portion and a line memory for the moving image portion to ideally separate the luminance signal and the chrominance signal to suppress color flicker and improve the S / N ratio , A three-dimensional Y / C separation circuit is used. In particular, since the field frequency of MUSE (high definition) broadcasting is 60.00 Hz and the field frequency of NTSC broadcasting is 59.94 Hz, this tertiary method is used as a method for separating the luminance signal and the color difference signal from the video signal from the M-N converter 204. The original Y / C separation means 213 is used.

The specific contents of the three-dimensional Y / C separating means 213 are described in, for example, Japanese Patent Application Laid-Open No. 3-46479. This publication describes the MUSE signal as NTS
EDTV, which is another high quality signal after conversion to C signal
As described above, when a screen is displayed using a video signal reproducing device of a signal system, the field frequency of the MUSE signal is 60.00 Hz and the field frequency of the NTSC is 59.
Due to the difference from 94 Hz, the chrominance carrier does not have the relationship of being inverted for each frame, and at least the line is not inverted. For this reason, when a signal having a high spatial resolution of a still image portion of the output signal converted from the MUSE signal to the NTSC signal is processed, a flicker failure occurs, and the signal is inverted between frames.
5Hz component flicker and 30H reversing between fields
Since a flicker of the z component is generated, and particularly a flicker of 15 Hz is noticeable, a method of removing the flicker in the EDTV signal processing after converting the MUSE signal is described.

On the other hand, in the dual-screen television receiver described with reference to FIG. 2, when the left screen is the main screen, the main screen is required to always reproduce a high-quality screen. Is connected to a three-dimensional Y / C separation circuit 213 to reproduce high-quality video. Also,
The right screen is a sub-screen, with few high-quality screens displayed.
Further, in order to reduce the cost of the television receiver, the Y / C separation means 214 for the right screen has an inexpensive circuit configuration using a glass comb or the like.

However, when the user of the television receiver reproduces and displays the MUSE signal on the left screen, a high-quality image can be reproduced by the three-dimensional Y / C separation process.
The screen of the MUSE signal may be displayed on the right screen. In this case, when the video signal from the MN converter 204 is selected by the second input selection unit 212, the signal from the MN converter 204 is converted into a luminance signal by a Y / C separation unit 214 such as a glass comb. Therefore, the obstacle cannot be removed by the flicker, and a screen with deteriorated image quality is displayed on the right screen.

For this purpose, for example, Japanese Patent Laid-Open No. 7-3127
Japanese Patent Publication No. 30 discloses a frame comb for the output of one input selecting means, a line comb for the output of the other input selecting means, and a left and right screen switching means of display input for the outputs of the frame comb and the line comb. There is described a dual-screen television receiver in which a high-quality signal such as MUSE is Y / C-separated by a frame comb and displayed on any screen by a left-right screen switching unit.

This conventional example is a method for separating a luminance signal and a color signal when a composite video signal is used. Also MUS
The conversion from the E signal to the NTSC signal may also be performed when the signal is converted into a composite video signal, or when the signal is completely separated into two signals of a luminance signal and a color difference signal as an S terminal signal (or called an S signal). However, this conventional example is a useful method when a composite video signal is used, and is not suitable when the S terminal signal is used as a signal for one of left and right (main and sub) screens. This is because when a signal that has already been separated into a luminance signal and a chrominance signal is to be displayed on a two-screen television receiver, the S terminal signal is directly input to the compression means without signal processing by either the left or right Y / C separation means. It is necessary to do it.

However, the S terminal signal obtained by the MUSE-NTSC conversion includes a 15-Hz component flicker which is inverted between frames in a still image portion, and cannot be sufficiently removed. An image may be displayed on the screen in a state in which is left.

[0015]

In the conventional dual-screen television receiver, the signal is converted by the MUSE-NTSC conversion means, the S terminal signal separated into a luminance signal and a color difference signal is subjected to compression processing, and then the signal is left or right. When displaying on the display means, there is a problem that flickers remaining during MUSE-NTSC conversion means are displayed without being removed.

[0016]

In order to solve the above-mentioned problems, the present invention provides a video signal for a main screen and a video signal for a sub-screen from a plurality of video signals including an S terminal signal input to a dual screen television receiver. Input selecting means for selecting a video signal for use, and one of Y / C separating means for separating the video signal selected by the input selecting means into a luminance signal and a chrominance signal.
The C separating means is a three-dimensional Y / C separating means composed of an inter-frame Y / C separating circuit and an intra-field Y / C separating circuit and a motion detecting circuit. When the S signal is selected by the input selecting means, Under the control of the motion detection circuit, the still image portion in the S signal is processed and output by the inter-frame Y / C separation circuit, and the moving image portion is output without any processing. And the video part are mixed and output,
This is a two-screen television receiver that can display an S terminal signal image on one of the main and sub screens.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the Y / C separation means of the dual screen television receiver according to the present invention.

The configuration shown in FIG. 1 includes a first tuner 101 and a second tuner 102 for receiving and selecting a plurality of video signals transmitted from a terrestrial broadcast, a satellite broadcast, a cable broadcast, or the like, and the broadcast video signals. A video input 103 such as a video cassette tape recorder or the like for recording and playing back a recorded video signal and an MUSE broadcast signal
It has a plurality of video signal supply sources including an MN converter 104 for converting to a TSC signal. Among the plurality of video signal supply sources, the first tuner 101 and the video input 1
03 and the MN converter 104 are connected to each fixed piece of the first input selection means 111. Second tuner 1
02 and the video input 103 are the second input selection means 112
Are connected to each fixed piece. First input selection means 11
1 is a three-dimensional Y / C separation unit 121 and a first output unit 1
31 and first compression means 1 for processing and compressing the left screen signal
A signal is output from the mixing matrix means 135 to a display means such as a cathode ray tube. The second input selection means 112
Mixing matrix means 1 via Y / C separating means 122 composed of glass comb and the like, second output selecting means 132 and second compressing means 134 for processing and compressing the right screen signal.
35, and a signal is output from the mixing matrix means 135 to a display means such as a cathode ray tube.

Further, the three-dimensional Y / C separating means 121 is also connected to a second output selecting means 132, and the Y / C separating means 122 is also connected to the first output selecting means 132. Further, the first and second input selection means 111, 1
The twelfth and first and second output selection means 131 and 132 are connected to a control means 136 composed of a microcomputer or the like.
It operates with the signal from 37.

In the dual-screen television receiver thus constructed, a control signal is generated from the control means 136 in response to an instruction of a main / sub input video signal from the remote control 137, and a plurality of video signal supply sources 101 to 104 are provided. , The first and second input selection means 111 and 112 select the designated video signal. If the selected signal is a composite video signal before being separated into luminance and chrominance signals,
The video signal selected by the input selection unit 111 is separated into a luminance signal Y1 and a chrominance signal C1 by a three-dimensional Y / C separation unit 121 and output to first and second output selection units 131 and 132. The video signal selected by the second input selection means 112 is separated into a luminance signal Y2 and a chrominance signal C2 by a Y / C separation means 122, and the first and second output selection means 131, 13
2 is output. The first and second output selection means 131,
132 generates a control signal from the control means 136 in response to a main / sub switching instruction for screen display from the remote control 137, and selects an image to be displayed on the left and right screens. For example, when displaying the video selected by the first input selection means 111 on the main (left) screen, the first output selection means 13
1 selects the luminance signal Y1 and the chrominance signal C1, which are the outputs of the three-dimensional Y / C separation means 121, and outputs them to the first compression means 133. Also, the second input selection means 11 is displayed on the sub (right) screen.
2 displays the selected video, the second output selection unit 132 selects the luminance signal Y2 and the chrominance signal C2 output from the Y / C separation unit 122, and outputs them to the second compression unit 134. Further, the first output selection means is a Y / C separation means 1
22 and the second output selection means 132 selects the output signal Y2 of the three-dimensional Y / C separation means 121.
When 1, C1 is selected, the first compression means 133 processes and compresses the image selected by the second input selection means 112 as a main (left) screen, and the second compression means 134 executes the first input means. The video selected at 111 is processed and compressed as a sub (right) screen.

The first and second compression means 133, 134
Are three-dimensional Y / C separation means 121 and Y / C separation means 12
Then, the luminance signals Y1 and Y2 and the color signals C1 and C2 are processed and compressed in the horizontal time axis direction. Note that the second compression means further delays the H / 2 phase for display on the left side of the display means.

The signals compressed by the first and second compression means 133 and 134 are mixed by a mixing matrix means 135 and output to a display means such as a cathode ray tube.

Next, the three-dimensional Y / C separation means 121 will be described in detail. The input terminal 401 of the three-dimensional Y / C separation unit 121 is connected to the output terminal of the first input selection unit 111, and the composite video signal (Y / C) or the luminance signal SY of the S terminal signal is input. The input terminal 401 is connected to the A / D converter 402. Further, the color signal SC of the S terminal signal from the first input selection unit 111 is input to the input terminal 403, and the input terminal 403 is connected to the A / D converter 404. The output of the A / D converter 402 is connected to a motion detection circuit 405, an inter-frame YC separation circuit 406, an intra-field Y / C separation circuit 411, and a synchronization separation timing circuit 412. The outputs of the motion detection circuit 405 and the inter-frame YC separation circuit 406 are connected to a mixing circuit 413.
Is output through a selector 415 to generate a luminance signal Y1. The output of the in-field Y / C separation circuit 411 is connected to one of the selectors 230, and
Is also connected. A on the other side of this secretor 230
An output from the / D converter is directly input, and an output of the selector 230 is connected to the mixing circuit 413. Further, the mixing circuit 414 includes the motion detection circuit 4.
05 and the YC separation circuit 406 between frames. Further, the mixing circuit 414 and the A / D converter 40
The output of No. 4 is configured to output the color signal C1 from the selector 416.

The selector 230 and the selector 416
Selects which of the signals input to the selectors 230 and 416 is to be output according to the control signal from the control means 136.

In such a configuration, the case where the video signal supply source 101 or 103 is selected as the main screen by the instruction of the remote control 137 will now be described. At this time, the control means 136 controls the first input selection means 11
1 and the composite video signal Y / C is input to the input terminal 401. This composite video signal Y / C is A / D
The converter converts the analog signal to a digital signal,
The converted still image portion of the digital signal is subjected to Y / C separation processing by an inter-frame YC separation circuit 406, and the luminance signal Y1 is supplied to the mixing circuit 413, and the color signal C1 is supplied to the mixing circuit 41.
4 is output. Further, the moving image portion of the digitally converted signal is subjected to Y / C separation in a Y / C separation circuit 411 in the field.
After the C separation, the luminance signal Y1 is output to the mixing circuit 413 via the selector 230, and the color signal C1 is output to the mixing circuit 414. At this time, a still image portion and a moving image portion of the video signal are detected by the motion detection circuit 405, and a signal for controlling the mixing ratio of the luminance signal Y1 and the color signal C1 separated in the still image portion and the moving image portion is output to each mixing circuit. 413, 414,
The completely separated luminance signal Y1 is output to the selector 415, and the color signal C1 is output to the selector 416. In this case, the selector 230 selects the luminance signal Y1 from the intra-field Y / C separation circuit 411, and
Reference numeral 6 denotes a control signal supplied from the control means 136 so as to select the color signal C1 from the mixing circuit 414.

Next, a case where a signal from the MN converter 104 is selected as a main screen in accordance with an instruction from the remote control 137 will be described. At this time, the control means 1
36 controls the first input selection means 111 to input the signal of the MN converter 104 to the input terminal 401. M
The -N converter 104 can output a signal separated into a luminance signal Y1 and a chrominance signal C1 by the signal processing procedure. From the MN converter 104, a so-called S terminal signal is obtained, which is converted into an NTSC signal and is already separated into a luminance signal and a chrominance signal.

The luminance signal SY and the chrominance signal SC of the S terminal signal from the MN converter 104 are input to the first input selection means 10.
1, the luminance signal SY is supplied to the terminal 401 and the color signal SC
Are input to a terminal 403, and each of them is input to an A / D converter 40.
2, 404. In the A / D converter 402, the luminance signal SY is converted from an analog signal to a digital signal, and the motion detection circuit 405 and the inter-frame YC separation circuit 4
06, the intra-field Y / C separation circuit 411, the synchronization separation timing circuit 412, and the selector 230. The still image portion in the luminance signal SY is subjected to inter-frame comparison in the inter-frame YC separation circuit 406 to perform flicker removal, and the mixing circuit 413 removes flicker due to leakage of the color carrier into the luminance signal. Y1 is output, and a color signal is output to the mixing circuit 414. Next, the moving image portion of the luminance signal SY is applied to the intra-field Y / C separation circuit 411 and the selector 230.
30 is controlled by a control signal from the control means 136 to select and output a signal from the A / D converter 402, and is output to the mixing circuit 413. The mixing circuit 413 controls the mixing of the luminance signals separated from the still image portion and the moving image portion by detecting the motion of the luminance signal SY of the motion detection circuit 405 and outputs the luminance signal Y1 to the selector 415.

On the other hand, the A / D converter 4
The color signal SC applied to 04 is guided to a selector 416, which is controlled by a control signal from the control means 136 so as to select and output a signal from the A / D converter 404. Because the mixing circuit 4
The color signal SC of the S terminal signal is output as it is without selecting the color signal derived from 14.

Although the description of the sync separation timing circuit 412 is omitted in the above description, the composite video signal and the S
In any of the terminal signals, the synchronizing signal in the video signal is detected, and the YC separation circuit 406 between frames and the Y signal in the field are detected.
/ C separation circuit 411 and a signal source for controlling a synchronous deflecting unit for a display unit such as a cathode ray tube (not shown).

Further, the second input selection means 112 selects a video signal different from that of the first input selection means 111 from the plurality of video signal supply sources according to a control signal from the control means 136, and the output is Y. The signal is separated into a luminance signal Y2 and a chrominance signal C2 by the / C separation means 122 and output to the first and second output selection means 131 and 132. The Y / C separation means 122 is different from the three-dimensional Y / C separation means 121 in that it uses a low-cost Y / C separation method such as a glass comb, a CCD, a two-line comb, a three-line comb, or a three-dimensional comb. Is used.

As described above, the first input selection means 11
The video signal selected in step 1 is a three-dimensional Y / C separation unit 121
And the video signal selected by the second input selection means 112 is Y / C separated by the Y / C separation means 122, and the luminance signals Y1, Y2 and the color signals C1, C2 are
It is guided to the first and second output selection means 131 and 132. The first and second output selection means 131 and 132 are for switching the left and right screens in accordance with an instruction of the remote control 137, and the image selected by the first input selection means 111 by a control signal from the control means 136. When the signal is displayed on the left (main) screen, the first output selecting means 13
1, the luminance signal Y1 and the color signal C1 are selected, and when the video signal selected by the second input selection means 112 is displayed on the right (sub) screen, the second output means 132 outputs the luminance signal Y2 and the color signal C1. The color signal C2 is selected. Next, when the left and right (main / sub) screens are exchanged, the first output selection unit 131 selects the luminance signal Y2 and the chrominance signal C2, and the second output selection unit 132 selects the luminance signal Y1 and the chrominance signal C1. The screen display can be exchanged by selecting.

The first and second output selection means 131, 13
The signals from 2 are respectively guided to first and second compression means 133 and 134 and are compressed in the horizontal time axis direction, and at the same time, the luminance signal and the chrominance signal are demodulated. Thus, two different images can be simultaneously displayed on the display means such as a cathode ray tube as a video signal in which the left and right (main and sub) screens are combined.

As described above, according to the present invention, the video signal selected by the first input selection means is separated into luminance and chrominance signals by the three-dimensional Y / C separation means.
Even when the SE signal is converted to an NTSC signal and supplied as an S terminal signal, flicker interference remaining in a still image portion of the S terminal signal can be easily removed, and the S terminal signal image can be left / right (mainly). Secondary) It is possible to provide a two-screen television receiver capable of displaying on any screen.

[0034]

According to the present invention, even when the S terminal signal is displayed on either the left or right (main / sub) screen, the three-dimensional Y / C separation means is used for one of the signal processing means, and the stationary signal in the S terminal signal is displayed. Since the flicker interference remaining in the image portion is easily removed, and the other signal processing means uses an inexpensive Y / C separation means, the cost of the television receiver does not increase at all as compared with the conventional one. It is possible to provide a two-screen television receiver that does not impair the quality of the left and right (main and sub) screens at all.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a configuration of a conventional dual screen television receiver.

[Explanation of symbols]

101 tuner 1, 102 tuner 2, 103 video input, 104 MN converter, 111 first input selection means, 112 second input selection means, 121
Three-dimensional Y / C separation means, 122... Y / C separation means, 13
DESCRIPTION OF SYMBOLS 1 ... 1st output selection means, 132 ... 2nd output selection means, 133 ... 1st compression means, 134 ... 2nd compression means, 135 ... Mixing matrix means, 136 ... Control means,
402, 404: A / D converter, 405: Motion detection circuit, 406: YC separation circuit between frames, 411: Y / C separation circuit within field, 412: Synchronization separation timing circuit, 413, 414 ... Mixing circuit, 415, 416, 23
0 ... selector

Claims (4)

[Claims] 1. A dual-screen television receiver capable of simultaneously reproducing and displaying a main screen and a sub-screen on a display means, wherein signals from a plurality of video signal sources including an S signal are selected.
Input selection means for deriving a first video signal and a second video signal; an input Y / C separation circuit, an intra-field Y / C separation circuit, and a motion detection when the first video signal is input; A first Y / C separation unit having a circuit for deriving a first output signal including a Y / C separated luminance signal and a chrominance signal; Deriving a second output signal including the obtained luminance signal and color signal
Y / C separating means, an output selecting means for selecting whether to display the first output signal and the second output signal on a main screen or a sub-screen, and first and second signals from the output selecting means. Signal compression means for respectively compressing the output signals of the first and second output signals, and synthesizing the first and second output signals compressed by the signal compression means to simultaneously display a main screen and a sub-screen on the display means. A signal synthesizing unit, wherein when the S signal is input as the first video signal, the first Y / C separating unit converts the still image portion of the luminance signal component into the inter-frame Y / C A two-screen television receiver characterized in that the image is processed and output by a separation circuit, the moving image portion is output as it is, and a still image portion and a moving image portion are mixed and output under the control of the motion detection circuit. 2. The method according to claim 1, wherein the second Y / C separation means is a comb filter using a glass delay line or a CCD, a comb filter using correlation of two lines or three lines, or a three-dimensional Y / C separation circuit. 2. The dual-screen television receiver according to claim 1, wherein: 3. The dual-screen television receiver according to claim 1, wherein the S signal is a signal generated from a MUSE-NTSC converter. 4. The apparatus according to claim 1, wherein when the first video signal is a composite video signal, the first Y / C separation unit performs a motion adaptive three-dimensional Y / C separation process. Dual-screen TV receiver.