JP3526056B2 - Television receiver - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver and selects video signals from a plurality of input sources such as a U / V tuner, a BS tuner, and a video input. The present invention relates to a television receiver capable of displaying. 2. Description of the Related Art With the increase of input sources such as U / V tuners, BS tuners, and video inputs, a plurality of different input sources are provided by using functions such as picture-in-picture and picture-out-picture. Images can be displayed on the same screen. The picture-in-picture function is a function of adding child screen information to the parent screen information and displaying one or more child screens S on the parent screen M as shown in FIG. . The picture-out-picture function is used in a 16: 9 aspect ratio HDTV wide screen, for example, as shown in FIG.
As shown in the figure, with respect to the parent screen A, the child screen B,
This is a function for displaying C and D. Further, as shown in FIG. 4C, there is also a picture-in-picture function capable of displaying two vertically long screens 1 and 2 of the same size. [0003] However, FIG. 4 (a)
In the case of the picture-in-picture function shown in (1), since the child screen S is output overlapping the parent screen M, the portion where the child screen S is displayed is missing from the parent screen M. As for the picture-out-picture function shown in FIG. 4B, a plurality of displayed sub-screens B, C, D
Is smaller than the parent screen A, and the information amount of the child screen is extremely small. In the conventional picture-in-picture function of the same size on two screens shown in FIG. 4C, the aspect ratio of each of the screens 1 and 2 is vertically long, and the display is not a conventional 4: 3 display. I have. SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and the aspect ratio input from a plurality of built-in or separate input sources is four. : 3: A video receiver capable of selecting a video signal of 3: 3 and displaying the selected video signal on display means having a display surface with an aspect ratio of 16: 9. The selection means for selecting the second video signal and the first and second 4: 3 video signals output from the selection means are arranged so that they have the same size, maintain the original aspect ratio, and have the maximum size. 16:
A digital synthesizing unit having first, second, and third field memories for synthesizing video signals displayed side by side on the display surface of No. 9 and a video signal output from the digital synthesizing unit; Video signal processing means for processing so as to be a signal for display means and supplying the signal to the display means, wherein the digital synthesizing means corresponds to the first and second video signals corresponding to the frequency of the respective synchronization signals. The digital data of the first and second video signals written in the first and second field memories are written as digital data in the first and second field memories at the set clock frequency. The second field memory is read out from one field memory in a state where the second field memory is arranged right and left at a clock frequency almost twice as high as that at the time of writing. Inclusive can write into the field memory, the third first written in the field memory of the second
Digital data corresponding to the video signal is read at a clock frequency corresponding to the frequency of the synchronization signal of the display means, and is output as a video signal for the display means. The video signals from a plurality of input sources are displayed on the same screen in the same size and with the aspect ratio maintained, so that the effective screen is maximized.
One television receiver can have almost the same functions as a plurality of television receivers. Hereinafter, using the television receiver of the present invention, for example, video signals of two kinds of input sources are of the same size on the same screen, and the effective size is maximized while maintaining the aspect ratio. An example in which the display is performed as described above will be described. FIG. 1 is a block diagram particularly showing a video circuit system of the television receiver of this embodiment. 1 in the figure
Denotes a U / V tuner, 2 denotes a BS tuner, and each selects a broadcast wave. 3 is an intermediate frequency amplifier, 6 is U
/ V tuner 1, BS tuner 2, video signal from video deck (VTR) 4, multi-disc player (MDP) 5, etc. connected to external terminals, switch SW
And a Y / C decoder 7 for separating a chrominance signal and a luminance signal, extracting a synchronizing signal, etc., and a luminance signal Y output from the Y / C decoder 6 and color difference signals BY, R-
A matrix circuit that produces RGB signals of three primary colors from Y;
Reference numeral 9 denotes a V drive for outputting a vertical deflection current according to the vertical synchronization signal extracted by the Y / C decoder 6 , and 10 denotes an H drive for outputting a horizontal deflection current according to the horizontal synchronization signal extracted by the Y / C decoder 6 . The deflection current is supplied to the deflection yoke 11 of the CRT 12. Reference numeral 13 denotes input terminals t1, t2, t3, t4,
It has output terminals ta and tb, and selects two types of video signals from the four types of video signals from the U / V tuner 1, BS tuner 2, VTR 4 and MDP 5, and outputs them to the Y / C decodes D1 and D2, respectively. The / V switch is shown. Each Y /
The C decodes D1 and D2 separate the chrominance signal and the luminance signal similarly to the Y / C decode 6. D is a digital processor (DVP), which is provided with A / D converters D3 and D4, a memory D5, a D / A converter D6, etc., and digitizes video signals from the Y / C decodes D1 and D2, respectively, and stores them in the memory D5. At the same time, the video data is read from the memory D5 so as to form a plurality of screens, and output to the matrix circuit 14. Reference numeral 8 denotes an R / G / B switch, which switches so as to output the RGB signal from the matrix circuit 7 in the case of single screen output and the matrix circuit 14 in the case of multiple screen output, and displays a plurality of screens. In this case, the composite screen formed by the digital processor D is output via the matrix circuit 14. Reference numeral 15 denotes the A / V switch 13, R / G
/ B switch 8, a CPU for controlling a digital processor D and the like via a control bus CB.
6 or an operation signal input from the infrared light receiving unit 17 via the demodulation unit 18 to perform volume volume up / down, channel selection, power on / off, screen switching, and the like. According to the block diagram shown in FIG. 1, the same size and the same aspect ratio are maintained on the same screen.
A case where the screen display is set so that the effective size is maximized will be described. For example, when the program selected by the BS tuner 2 and the program reproduced by the VTR 4 are displayed on the two screens, the R / G / B switch 8 is set to the matrix circuit 14.
Side, and the video signal of the BS tuner 2 is supplied from the input terminal t3 of the A / V switch 13 to the output terminal t.
a, the signal is separated into a chrominance signal and a luminance signal by the Y / C decoder D1, and the A / D converter D3 in the digital processor D
And is stored in the memory D5. The video signal of the VTR 4 is also supplied from the input terminal t2 of the A / V switch 13 to the Y / C switch via the output terminal tb.
The signal is separated into a chrominance signal and a luminance signal by the decoding D2, converted into a digital signal by the A / D converter in the digital processor D by the D4, and stored in the memory D5. In this way, the video signals of the BS tuner 2 and the VTR 4 which have been converted into digital signals and stored in the memory D5 are displayed on the same screen at a predetermined read timing with reference to the vertical synchronization signal of the Y / C decoder 6. The data is read out as data to be displayed while maintaining the same size and aspect ratio, converted into an analog signal by the D / A converter D6, and output to the matrix circuit 14. For example, port-type field memories FMa and FM capable of simultaneously reading and writing the two-system video signals Va and Vb shown in FIG.
b, and then each field memory FMa, FMb
Is read out in the direction indicated by the dotted line at a clock frequency almost twice that at the time of writing, and is written into the field memory FM for synthesis. The field memory FM for synthesis
Is read out at the clock frequency corresponding to the normal horizontal and vertical frequencies synchronized with the scanning signal of the monitor screen, and supplied to the D / A converter D6. The writing and reading timings of the field memories FMa and FMb are performed based on the synchronization signals of the two video signals Va and Vb, and the synthesizing field memory FM may be performed based on the synchronization timing of the scanning signals. And D
The video signal converted by the / A converter D6 is output from the matrix circuit 14 to the CRT (CRT) 12 via the R / G / B switch 8. A method of selecting two screens from among a plurality of input sources is, for example, using an input source selected immediately before selecting two-screen display as a main screen, and using an A / V switch for a video signal from the input source. 13 is output from the output terminal ta, and the video signal of the other input source may be subjected to signal processing as described above as sub-screen data from the output terminal tb by the user's arbitrary selection. For example, when the user sets two favorite input sources in advance and selects the two-screen display, an image of the set input source may be output. FIG. 3 is an explanatory diagram of a screen when the television receiver of the present embodiment displays two types of screens. In the figure, M indicates a display portion of a cathode ray tube, and A, B, C, and D are displayed in the display portion M so as to maintain the original aspect ratio at the same size and maximize the effective size. It is assumed that the display unit displays images of different input sources. FIG. 3A is a diagram showing a case where the screens A and B of the same size with the 4: 3 aspect ratio are displayed on the display unit M of the CRT having the 4: 3 aspect ratio so that the effective screen is maximized. . FIG. 3B shows a case where normal broadcast screens A and B of the same size with a 4: 3 aspect ratio are displayed on a display section M of a CRT for an HDTV, which also has an aspect ratio of 16: 9. FIG. The display portions A and B have the same size, the aspect ratio is kept at 4: 3, and the background other than A and B in the display portion M has an arbitrary color such as blue. Can be selected. As for the audio output, one of A and B may be output as a main output from a speaker, and the other may be output to an external output such as a headphone, or may be output using two channels LR. The sound of A may be output from the left speaker, and the sound of B may be output from the right speaker. Further, by increasing the input of the digital processor D, it is possible to display four screens A, B, C and D as shown in FIGS. 3 (c) and 3 (d). . FIG. 3C is a diagram showing a case where four screens A, B, C, and D of the same size and having the same size are output on the display unit M of a CRT having a 4: 3 aspect ratio. FIG. 3D shows a 16: 9 aspect ratio on the display section M of a CRT for an HDTV.
9 is a diagram when four screens A, B, C, and D of the same size are output with an aspect ratio of 9; FIG. A can display the U / V tuner 1, B can display the BS tuner 2, C can display the VTR4, D can display the MDP5 video, and one television receiver is equivalent to four televisions. Can be displayed. In addition, U / V tuner 1
Is provided, it is possible to output different channel broadcasts in the VHF band as two screens. Regarding audio output, two screens may be arbitrarily selected from four screens and output, as in the case of the two-screen display shown in FIGS. 3 (a) and 3 (b). As described above, the television receiver of the present invention has a selection means for selecting an input video signal, and simultaneously inputs two or more video signals output from the selection means. By providing digital synthesizing means for synthesizing processing and video signal processing means for supplying a video signal output from the digital synthesizing means to a CRT, when displaying a plurality of screens, the digital synthesizing means has the same size as the original. Since the aspect ratio can be maintained and the output can be output to the monitor screen in an arrangement that maximizes the effective size on the multi-screen, for example, a plurality of built-in or separate U / V tuners, BS tuners, VTRs, etc. Since images from different input sources can be displayed on the same screen without missing images, multiple TVs can be displayed on one TV receiver. There is an advantage that it has almost the same function as a revision receiver.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a television receiver according to an embodiment of the present invention. FIG. 2 is an explanatory diagram when digitally synthesizing a video signal. FIG. 3 is an explanatory diagram of a multi-screen display according to the embodiment of the present invention. FIG. 4 is an explanatory diagram of a conventional multi-screen display. [Description of Signs] 6 Y / C decoder 8 R / G / B switch 7, 14 Matrix circuit 13 A / V switch D Digital processor D1, D2 Y / C decode D3, D4 A / D converter D5 Memory D6 D / A converter FMa, FMb Field memory FM Field memory for synthesis

Claims (1)

(57) [Claims 1] A video signal having an aspect ratio of 4: 3 input from a plurality of built-in or separate input sources and having an aspect ratio of 16: 9 is selected. In a television receiver capable of displaying on a display means having a display surface, a selection means for selecting first and second video signals from a plurality of input 4: 3 video signals, and an output from the selection means The first and second 4: 3 video signals to be displayed are displayed side by side on the 16: 9 display surface such that the original aspect ratio is maintained at the same size and the original aspect ratio is maximized. Digital synthesizing means having first, second, and third field memories for synthesizing as a signal; and processing a video signal output from the digital synthesizing means to be a signal for the display means. Video signal processing means for supplying to the display means, the digital synthesizing means, wherein the first and second field memories store the first and second video signals at a clock frequency corresponding to the frequency of each synchronization signal. The digital data of the first and second video signals written in the first and second field memories are written in the first and second field memories, respectively.
To read from one field memory in a state of arranging the second field memory to the left and right, read in approximately twice the clock frequency at the time of writing, inclusive can write to the third field memory, said third field memory Said first, written in
A television receiver, wherein digital data corresponding to a second video signal is read out at a clock frequency corresponding to a frequency of a synchronization signal of the display means, and is output as a video signal for the display means.