JPH03154581A - Television receiver - Google Patents

Abstract

PURPOSE:To easily select a channel for a main pattern and sub pattern channel in a short time by a viewer by using a selection means so as to select a channel of the picture displayed on the main pattern and sub pattern channels from the channels of the pictures in multi-screen display in the pattern selection mode. CONSTITUTION:The pattern selection mode displaying the pictures of plural channels in multi-screen is provided and the channel of picture to be displayed on the main and sub screen is selected by using selection means 26, 35, 36, 38 among channels of the pictures in multi-screen display. Thus, when the pictures of plural channels having a 2nd aspect ratio is displayed on the display screen having a 1st aspect ratio while the pattern is divided into the main pattern and the sub pattern as the multi-picture mode, the selection of the channel for the main and sub patterns is implemented easily in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television receiver capable of displaying an image having a normal NTSC format aspect ratio on a screen having a high-definition format aspect ratio, for example.

[Summary of the invention]

The present invention is a television receiver in which an image having an aspect ratio for a normal NTSC system is divided into a main screen and a sub-screen and displayed on a screen having an aspect ratio for a high-definition system, for example. , by providing a screen selection mode for displaying images of a plurality of channels on a multi-screen, and selecting channels of images to be displayed on the main screen and the sub-screen by a selection means from among the channels of the images displayed on the multi-screen, This allows the viewer to easily and quickly select channels for the main screen and sub-screen.

[Conventional technology]

The aspect ratio of a typical NTSC screen in which the number of horizontal scanning lines per frame is 525 is 4:3. Furthermore, conventionally, the video signals output from a television tuner and the video signals played back from a video tape recorder (VTR), etc. all correspond to images with an aspect ratio of 4=3, so the image shown in FIG. As shown, when the sub-screen (2) is inserted into the main screen (1), it becomes a so-called picture-in-picture, and a portion of the main screen (1) always has a missing part.

Recently, in order to improve the resolution of the television broadcasting system, which has an aspect ratio of 4=3, a so-called high-definition system, which has 1125 horizontal scanning lines per frame and an aspect ratio of 1629, has been developed. . And currently 2
Since there are a variety of television broadcasting systems that support images with different aspect ratios, a single television receiver is being developed that can support both of these two types of television broadcasting systems. . in this case,
The aspect ratio of the display screen of a cathode ray tube is generally set to 16=9 for high-definition systems. Further, even in a television receiver that is compatible with two types of television broadcasting systems as described above, display in a multi-picture mode consisting of a main screen and a sub-screen is possible.

By the way, if an image (main screen) with an aspect ratio of 4:3 is projected on the display screen of a high-definition cathode ray tube without vertical margins, a margin will appear in the horizontal direction of the display screen. Therefore, by reducing and displaying a plurality of images (sub-screens) with an aspect ratio of 4=3 in the margin, the area of the missing part of the main screen can be made extremely small. In other words, when displaying multiple channels of images with an aspect ratio of 4=3 on a high-definition display screen in multi-picture mode by dividing them into a main screen and a sub-screen, the area of the missing part of the main screen must be Extremely small and efficient display becomes possible.

When displaying in multi-picture mode, one way to select channels of programs to be displayed on the main screen and sub-screen is, for example, by scanning all received channels with a television receiver and sequentially displaying programs on each channel. One possible method is to display the programs on the display screen for a predetermined period of time and select a desired channel from among the programs that are sequentially displayed.

[Problem to be solved by the invention]

However, such a method of scanning all reception channels one by one has the disadvantage that it takes time to select a desired channel and is inefficient.

Especially recently, many programs are being broadcast on UHF band channels in addition to VHF band channels, and NTSC programs are being broadcast on multiple channels of satellite broadcasting. The method of scanning reception channels one by one takes too much time.

In view of the above, the present invention provides a method for displaying images of a plurality of channels having a second aspect ratio on a display screen having a first aspect ratio in a multi-picture mode by dividing the images into a main screen and a sub-screen. , it is an object of the present invention to enable selection of channels for the main screen and sub-screen to be performed easily and in a short time.

Means for Solving Problem C] As shown in FIG. 1, the present invention provides a screen (35a) having a first aspect ratio (eg 16:9) with a second aspect ratio (eg 4:3). The main screen (41) and the sub-screens (42) to (as shown in FIG. 2, for example)
44) A television receiver configured to display images of multiple channels (for example, the fourth
As shown in the figure), a screen selection mode for multi-screen display is provided,
Selecting means (26), (35) from among the channels of the images displayed on the multi-screen.

(36) and (38) to the main screen (41)
And the channel of the image to be displayed on the sub-screens (42) to (44) is selected.

(Operation) According to the present invention, by setting the television receiver to the screen selection mode, many channels having the second aspect ratio are displayed on the screen (35a) having the first aspect ratio. Images are displayed simultaneously. Therefore, the viewer can easily and quickly select the image channel to be displayed on the main screen (41) and sub-screens (42) to (44) from among the many channels. be able to.

〔Example〕

Hereinafter, an embodiment of the television receiver according to the present invention will be described with reference to FIGS. 1 to 5.

In this example, the present invention is applied to a television receiver whose cathode ray tube display screen has an aspect ratio of 16:9 and is capable of receiving a high-definition system with an aspect ratio of 16:9 and a normal NTSC system with an aspect ratio of 4:3. is applied. still,
In this example, explanation of the audio signal will be omitted.

FIG. 1 shows the television receiver of this example. In FIG. 1, (3) is a hybrid tuner as a whole, (4) is a high-definition monitor as a whole, (5) is an antenna for UHF band and VHFHF borrowing, (6) is a BS antenna for receiving satellite broadcasting. In the hybrid tuner (3), the received signal of the antenna (5) is supplied to the input terminal of the U/V tuner (7) for UHF and VHF bands, and the received signal of the BS antenna (6) for satellite broadcasting is supplied to the input terminal of the U/V tuner (7) for UHF and VHF bands. Tuner (8
) input terminal. Regarding satellite broadcasting, a total of 8 channels are allocated in the Z band (12G) (odd channels from the 1st channel (BS-1) to the 15th channel (BS-15)) in Japan, and the bandwidth per channel is The width is 27 MHz.Satellite broadcasting programs include programs in the NTSC broadcasting system, which has a normal number of scanning lines of 525, as well as programs in the high-definition broadcasting system, which has a number of scanning lines of 1125. The bandwidth of the baseband signal of
lSE (ultiple Sub-nyquist
8 depending on the Sampling Encoding method
The band is compressed to MHz and transmitted.

(9) shows a tuner central processing unit (tuner CPU) that controls the operation of each component of the hybrid tuner (3). The tuner CPU (9)
When an instruction code is supplied to the tuner CP, the tuner
U (9) sets reception channels of tuners (7) and (8), etc. The U/V tuner (7) demodulates the reception signal of the set reception channel into NTSC
This video signal is supplied to the first fixed contact of each of the main switch circuit (12) and the sub switch circuit (13). When the set reception channel is broadcasting an NTSC program with normal resolution, the BS tuner (8) performs FM demodulation and removal of energy spread signals to obtain the NTSC video signal. The video signal is sent from the output terminal
Supplied to fixed contacts. On the other hand, the BS tuner (8) has the set receiving channel set to the high-definition system (MUSE).
When broadcasting a program using the MIJSE system, a MUSE signal is obtained by FM demodulation, and this MIJSE signal is supplied from the output terminal FMd to the MIJSE decoder (14).

Further, the movable contacts of the main switch circuit (12) and the movable contacts of the sub switch circuit (13) are connected to output terminals (3a) and (3b), respectively, and the scanning signal generated by the MUSE decoder (14) in a well-known manner is connected to the output terminals (3a) and (3b). A high-definition system Y/C separated baseband signal having 1125 lines is supplied to the output terminal (3c). When displaying in multi-picture mode in this example, the video signal selected by the main switch circuit (12) corresponds to the main screen, and the video signal selected by the main switch circuit (12) corresponds to the main screen;
The video signal selected in step 3) corresponds to the sub-screen, and switching between these switch circuits (12) and (13) is performed by the tuner CPU (9).

Output terminals (3a) to (3c) of this hybrid tuner (3)
are connected to input terminals (4a) to (4c) of a high-definition monitor (4) using signal cables (15), respectively.

In this high-definition monitor (4), the input terminal (
4a) and (4b) are connected to a main switch circuit (16) and a sub switch circuit (17) each consisting of a four-person multiplexer.
), and the input terminal (4c) is connected to the connection terminal (4d) and the second fixed contacts of each of the three-man power main switch circuit (18) and sub-switch circuit (19). , its connection terminal (4d) is connected to the input terminal of a high-definition baseband video tape recorder (VTR) (25), and this baseband VTR (25)
The output terminal is connected to the first fixed contact of each of the main switch circuit (18) and the sub switch circuit (19) via the connection terminal (4e). (20) is a video disc playback device; (21) is a video tape recorder B (VT R-B);
), (22) is video tape recorder A (VTR-
A), the video signals reproduced from these externally connected NTSC video sources (20) to (22) are connected to the second to fourth fixed contacts of the main switch circuit (16) and the sub switch circuit ( 17) to the second to fourth fixed contacts.

The video signal appearing at the movable contact of the main switch circuit (16) is then supplied to the NTSC decoder (23).

20 The NTSC decoder separates the video signal into Y/C and converts the number of horizontal scanning lines from 525 to 1125 by performing multiple reading using a frame memory. That is, the 20NTSC decoder (23) also operates as an upconverter. This NTSC decoder (23
) (luminance signal Y and color difference signal PB,
PR) is supplied to the third fixed contacts of the main switch circuit (18) and the sub switch circuit (19) via the time axis processing circuit (24), respectively. This time axis processing circuit (24) compresses only the video signal in the time axis direction for each horizontal period.
An image that is a perfect circle on a cathode ray tube for an SC system will also be a perfect circle on a cathode ray tube for a high-definition system (that is, if the circularity ratio is 1 =
1).

The baseband signal generated at the movable contact of the main switch circuit (18) is synthesized by a synthesis circuit (26) including a matrix circuit.
is supplied to one input terminal of the

Also, (2nd) shows the sub-screen processing circuit as a whole, and 4th
The video signal generated at the movable contact of the human-powered sub-switch circuit (17) is passed through the Y/C separation circuit (27) to the analog/digital (A/D) converter (29) in the sub-screen processing circuit (28). The baseband signal generated at the movable contact of the three-man powered sub-switch circuit (19) is supplied to the other input terminal of its A/D converter (29), and the A/D conversion The device (29) converts one of the manually input signals into a digital signal and converts it into a video signal R, AM (VRAM) (30) having a storage capacity for one 3 frames.
There is no need to write to a predetermined area of the VRAM (30)
A baseband signal read out at a predetermined thinning rate is supplied to the other input terminal of the synthesis circuit (26) via a digital/analog (D/A) converter (31). (32) is a memory controller, and this memory controller (
32) controls the input and read addresses of the VRAM (30). For example, as shown in Figure 2, the sub screen (42
) to (44) in the vertical direction, if the input signal is NTSC, the vertical (vertical direction) and horizontal direction (horizontal direction) thinning rates are set to SSN V and 5SNX, respectively. Then, SSN, = 1125/ 3152
5=0.71SSNx=4/16=0.25. On the other hand, when the input signal is in high-definition format, the vertical and horizontal thinning rates are set to SSH and 5, respectively.
If SHX, then SSH, = 173 = 0.33 SSH, = 1/3 = 0.33. Note that instead of reading the signal from the VRAM (30) at a predetermined thinning rate, the signal may be written to the VRAM (30) at a predetermined thinning rate. When signals are written at a predetermined thinning rate in this manner, there is an advantage that the capacity of the VRAM (30) can be reduced.

(33) is a synchronous separation circuit, (34) is a deflection circuit, (35)
) indicates a cathode ray tube (CRT) for high-definition systems;
A synchronization separation circuit (33) sends vertical and horizontal synchronization signals separated from the video signal generated at the movable contacts of the main switch circuit (18) to a deflection circuit (34), a memory controller (32), and a monitor CPU (36) to be described later. The three primary color signals appearing at the output terminals of the synthesis circuit (26) are passed through a well-known video signal processing circuit (not shown) to the cathode ray tube (35).
).

(36) is the tuner CPU (9) of each component of this high-visibility monitor (4) and the hybrid tuner (3).
Tuner central processing unit (tuner C1
This tuner CPU (36) connects the switch circuits (16) to (19) via the pass line BS.
, NTSC encoder (23), time axis processing circuit (24)
), the memory controller in the sub-screen processing circuit (28) (
32), controls the operations of the combining circuit (26), the deflection circuit (34), and others. Further, (37) indicates a signal distributor, and this signal distributor (37) is connected to the monitor commander (38).
The command code transmitted from the light receiving element (39) is transmitted to the monitor CPU (36), and at the same time, the command code is transmitted to the tuner CPU (9) through the signal cable (40). In addition, the tuner CPU (
9) and monitor 〇 P U (36) is a signal distributor (
37) so that instruction codes can be exchanged. Furthermore, the monitor CPU (36) synthesizes video signals such as channel information for so-called screen display at any time through a synthesis circuit (26).
) to the third input terminal of the terminal.

To explain the operation of this example, when the multi-picture mode is set, the display screen of the cathode ray tube (35) of this example shows the second
As shown in the figure, a multi-picture display is performed. The frame with an aspect ratio of 16:9 on the outer periphery of FIG. 2 corresponds to the entire display screen (35a) of the cathode ray tube (35), and this entire display screen has an aspect ratio of 4:3. A main screen (41) and three sub-screens (4:3) with an aspect ratio of 4:3.
It is divided into 2) to (44). That is, each of these screens (41) to (44) is a normal NT with a number of scanning lines of 525.
This is an image selected from among the images of an SC video source. In this case, the main screen (41) and the sub-screen (42)
As the video source in step (44), normally the video source that was last selected by the viewer as the main screen and sub-screen before the power is turned off is selected. Specifically, the type of video source selected last (tuner (7) or (8) or video source (20), (21) or (22)) and if the video source is a tuner. Monitor the receiving channel CPU (3
6) is written in the non-volatile RAM (so-called last memory), and the contents of the non-volatile memory are read out when setting the multi-picture mode.

However, as described below, the main screen (41) and sub-screen (42) ~
The video source of the image (44) (and the receiving channel when the video source is a tuner) can be newly selected by the viewer at any time.

For example, if you select the U/V tuner (7) as the video source for the sub-screens (42) to (44),
) to (44), when displaying programs from different reception channels, the tuner CPU (9) sends the three specified children to the U/V tuner (7) in sequence at a cycle of about 8 vertical cycles. Channel data is provided. And U
The video signals of the three channels are periodically scanned from the /V tuner (7) through the sub switch circuits (13) (17) and the Y/C separation circuit (27). It is supplied to the screen processing circuit (28). Therefore, while the main screen (41) is a moving image, the sub-screens (42) to (44) are strobe-like moving images (a type of still image).

Further, on a part of the main screen (41) and the sub-screens (42) to (44), there are displays indicating the respective video sources ("Vite: t1", "U/VICf") by means of a screen display function.
l, B515CH'V! etc.) will be displayed. Therefore, the current status of these video sources can be reliably identified to the viewer.

Also, the programs on the sub screens (42) to (44) can be displayed on the main screen (41).
) may be the same as the program. In this case, the sub screen (4
Since the video signals of 2) to (44) are always perfectly synchronized, the images of these sub-screens 42) to (44) also become moving images.

The special advantages of using a cathode ray tube (35) whose entire display screen has an aspect ratio of 16:9 as in this example will be explained with reference to FIG. That is, at the left end of the entire display screen in FIG. 2, there are sub-screens (42) to (44) with an aspect ratio of 4:3.
When arranging them vertically with a gap (), there will be an empty area with an aspect ratio of 12:9, or 4:3, at the right end of the second full display screen, so the main screen (with an aspect ratio of 4:3) will be created in this empty area. 41) can be inserted as is. Therefore, unlike the example in FIG. 7, the main screen (4I) of this example has the advantage that it does not feel strange to the viewer because there is no missing part. If the display in multi-picture mode (example in Figure 7) is called picture-in-picture, then
The display in the multi-picture mode of this example (the example in FIG. 2) can be called a picture-out picture.

In the television receiver of this example, the main screen (41) and sub screens (42) to (44) in multi-picture mode are
), the viewer operates the screen selection key (38a) (Fig. 3) on the monitor commander (3) to select the monitor CPU (36). ) to screen selection mode.

In this screen selection mode, the monitor CPU (36)
scans all NTSC channels of tuners (7) and (8) via the tuner CPU (9) at a predetermined period, and subverts the video signals sequentially output from these tuners (7) and (8). Switch circuit (13), (
17) and the Y/C separation circuit (27) to the sub-screen processing circuit (28). This sequentially supplied video signal is processed by an A/D converter (29) at a predetermined thinning rate.
) to VRAM (30) and write this νRAI
'1 (30), the video signal that continued to be sent to the D/A converter (
31) and a cathode ray tube (35) via a synthesis circuit (26).
As shown in FIG. 4, the display screen (35a) of the cathode ray tube (35) displays, for example, images of 12 channels of programs divided into 12 parts as strobe-like moving images. Ru. In this case, for example, VRAM
By writing the data of the receiving channel at the predetermined address (30), the respective channel numbers are simultaneously displayed in the upper right portion of the image of each channel. Further, when the screen selection key (38a) is operated one more time, images of programs for another 12 channels are displayed on the display screen (35a).

Furthermore, the monitor CPU (36) displays a cursor (of a predetermined shape) on its display screen (35a) using the screen display function.
47). After the viewer operates the main screen key (38b) of the monitor commander (38) in FIG. When you move it up and operate the enter key (46), the channel data corresponding to that channel 8S15 is transferred to the inadvertent RAM in the monitor CPU (37).
It is written to address N.

Next, after the viewer operates the sub screen key (38c) of the monitor commander (38), the cursor movement key (
45) to move the cursor (47) onto the image of channel 6, for example, and press the enter key (46).
), the display screen (35a
) Index mark °' in the channel 6 image above
*l" is displayed. Specifically, data corresponding to the index mark "*l" is written to a predetermined location in the VRAM (30). At the same time, as shown in FIG. 6, the monitor CPU (36) The channel data of channel 6 is written to address N2 of the nonvolatile RAM.

Then, the viewer operates the cursor movement key (45) to move the cursor (47) to the image of channel 8, operates the enter key (46), and then moves the cursor (47) to the image of channel 12. By moving up and operating the enter key (46), an index mark "+" will be placed in the images of channels 8 and 12 on the display screen (35a), respectively.
2”° and “+3” are displayed, and as shown in FIG.
Channel data of channels 8 and 12 are written to addresses (N, + 1 ) and (Nz+2), respectively.

After that, when the viewer operates the multi-picture key (38d) of the monitor commander (38), the monitor CP
U (36) is the channel data at address N (main screen) in the non-volatile built-in RAM and addresses N2 to (N, +2) (
The channel data of the sub screen) is sent to the tuner CPU (9
), and the main switch circuit (12), (
16), (18) and sub switch circuit (13),
(17) The movable contacts are set according to the channels of the main screen and the sub screen, respectively. And tuner CPU
(9) is the U/V tuner (7) and the BS tuner (8)
By supplying channel data for the main screen and three channel data for the sub-screen at a predetermined period, the display screen (35a) of the cathode ray tube (35) displays a multi-channel data as shown in FIG. Picture mode is displayed.

As described above, according to this example, by setting the screen selection mode, 1 is displayed on the display screen (35a) of the cathode ray tube (35).
Images for two channels are displayed together, and a cursor (47) for selecting the desired channel is displayed, allowing the viewer to easily and quickly select the channel to be displayed in multi-picture mode. There are benefits that can be made.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various configurations may be adopted without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention, when images of a plurality of channels are divided into a main screen and a sub-screen and displayed in multi-picture mode, a viewer can easily and quickly select channels on the main screen and sub-screen. There are benefits that can be made.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a television receiver according to the present invention, FIG. 2 is a front view showing a display screen in multi-picture mode, FIG. 3 is a plan view showing a monitor commander, and FIG. 5 and 5 are respectively front views showing the display screen when the screen is selected, and FIG. 6 is the monitor CP IJ of the example shown in FIG. 1.
(36) is a diagram showing the data structure of the nonvolatile RAM, and FIG. 7 is a front view showing the display screen of the conventional example. (26) is a synthesis circuit, (35) is a cathode ray tube, (35a)
is the display screen, (36) is the monitor CPU, (38)
is the monitor commander, (41) is the main screen, (42) ~
(44) are sub-screens.

Claims (1)

[Scope of Claims] A television receiver configured to divide and display an image having a second aspect ratio on a screen having a first aspect ratio into a main screen and a sub screen, the television receiver having a plurality of channels. A screen selection mode is provided for displaying the images on multiple screens, and a selection means selects a channel of the image to be displayed on the main screen and the sub screen from among the channels of the images displayed on the multiple screens. television receiver.