JPH02202189A - Television receiver - Google Patents

Abstract

PURPOSE:To display the picture of character information in the display area of a television receiver whose broadcasting system is different without being distorted by applying signal conversion to the signal of the character information picture in order to cope with the difference of the broadcasting system. CONSTITUTION:The signal of the character information picture outputted from a terminal 25 is time division multiplexed to areas 261-263 and scanning line transformation with time division is executed to the signal by a scanning line transformation circuit 17. After that, the signal is supplied to a synthesized picture preparation circuit 18. This synthesized picture preparation circuit 18 displays the character information picture in divided areas 141-143 of a display area 12 on a high definition display 11 and synthesizes the signal of the character information picture and an NTSC television signal so that the picture of the NTSC television signal obtained from the output of a signal conversion circuit 8 can be projected in a divided area 13. Thus, when the picture of the character information is displayed in the display area 12 of the high definition display 11, the picture is not distorted.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is directed to receiving a television signal having an aspect ratio H different from that of a display area, and multiplexing the television signal to the television signal. The present invention relates to a television receiver that displays a text information image obtained from a text multiplex signal in the &water area.

(Prior Art) In recent years, a high-definition television system with a larger aspect ratio than the current NTSC system has been developed. Television receivers using this system (hereinafter referred to as high-definition television receivers) are generally compatible with the current NTSC system, and are compatible with the current NTSC system television signal (hereinafter referred to as NTSC television signal). ) includes a character multiplex signal, the character information image obtained from this character multiplex signal can be displayed.

FIG. 11 shows the configuration of a conventional high-definition television receiver capable of displaying such text information images.

In FIG. 11, a character multiplex signal separation processing circuit 4 separates a character multiplex signal from an NTSC television signal inputted from a terminal 1, and transmits first character information obtained from this character multiplex signal to a character information selection circuit. Supply to 7.

The character information separation processing circuit 5 separates a digital signal superimposed on a high-definition television system television signal (hereinafter referred to as a high-definition television signal) inputted from the terminal 2, and obtains information from this digital signal. The second character information is supplied to the character information selection circuit 7.

The character information generation circuit 6 supplies the character information selection circuit 7 with third character information obtained from a signal from at least one external device that is input manually through the terminal 3 or a signal generated in the internal circuit of the receiver.

The character information selection circuit 7 is connected to the first. Second. One of the third character information is selected and supplied to the composite screen creation circuit 9.

The signal conversion circuit 8 performs signal conversion such as scanning line conversion on the NTSC television signal input from the terminal 1 and supplies it to the composite screen creation circuit 9 .

As shown in FIG. 12, the composite screen creation circuit 9 converts the NTSC television signal screen obtained from the conversion output of the signal conversion circuit 8 into a divided area 13 on the left (or right) of the display area 12 of the high-definition display 11. The character information screen obtained from the selection output of the character information selection circuit 17 is
Two input signals are synthesized so as to be displayed in a divided area 14 that is generated on the right (or left) side of the display area 12 due to the difference in aspect ratio between the TSC system and the high-definition television system.

The signal switching circuit 10 selects either the high-definition television signal input from the terminal 2 or the output of the composite screen creation circuit 9, and supplies it to the high-definition display 11.

The above describes a conventional high-definition television receiver capable of displaying a text information screen.However, conventional high-definition television receivers display text information screens using the NTSC system text multiplex signal as is. Because it is,
There is a problem in that vertical or horizontal distortion occurs on the display screen. For example, there was a problem in that what was originally a perfect circle was displayed as an ellipse that expanded in the vertical or horizontal direction. This is because the number of pixels in the vertical or horizontal direction of the screen is different between the NTSC system and the high-definition television system.

(Problems to be Solved by the Invention) As described above, conventional high-definition television receivers capable of displaying NTSC text information screens have had the problem that the text information screen is distorted.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a television receiver that can display an NTSC character information screen without distortion even when the screen is displayed on a high-definition television receiver.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention time-division multiplexes each signal of a plurality of character information screens obtained from a character multiplex signal, and means for combining screens into one screen; and means for converting the signal of the character information screen to match the aspect ratio of the display area, and at least a part of the signal conversion processing is performed by the time division multiplexing process. and means for separating and resynthesizing a composite screen of the plurality of character information screens obtained from the output of the signal conversion process and displaying the resulting screen in a display area.

(Function) According to the above configuration, the signal of the character information screen is converted to match the aspect ratio of the display area.
Also, the text information screen can be displayed without distortion.

Further, since at least a part of the signal conversion processing is performed after time division multiplexing processing, the circuit scale does not increase even though the structure is configured to synthesize a plurality of character information screens.

(Example) Please refer to the drawings below.1. One embodiment of the present invention will now be described in detail.

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention. In FIG. 1, the same parts as those in FIG. 11 are given the same reference numerals, and detailed explanations will be omitted.

In FIG. 1, the output of the character multiplex signal separation processing circuit 4,
That is, the character information screen signal obtained from the character multiplexed signal superimposed on the NTSC television signal is frequency-converted by the frequency conversion circuits 1 and 5 and then supplied to the time division multiplexing circuit 16.

The time division multiplexing circuit 16 time division multiplexes the signals of the plurality of character information screens frequency-converted by the frequency conversion circuit 15, thereby synthesizing the plurality of character information screens into one screen. This time division multiplexed output is the scanning line conversion circuit 1
7, the composite screen creation circuit 18
is supplied to

As explained above with reference to FIG. 12, the composite screen creation circuit 18 displays the screen of the NTSC television signal that has undergone signal conversion processing such as frequency conversion and scanning line conversion by the signal conversion circuit 8 on the high-definition display 11. Displayed in the divided area 13 on the left side (or right side) of the area 12, and scan line conversion circuit 1
7. Combine the two signals so that the character information screen supplied from the character information separation processing circuit 5 and the character information generation circuit 6 is displayed in the divided area 14 caused by the difference in aspect ratio, and further combine these two signals. Blanking l A blanking level signal output from the novel generating circuit 19 is added.

Note that the other parts are the same as those shown in FIG. 11 above.

FIGS. 2 and 3 are circuit diagrams showing specific configurations of a circuit block A consisting of a frequency conversion circuit 15 and a time division multiplexing circuit 16, respectively.

First, the example shown in FIG. 2 uses memory to perform frequency conversion and time axis multiplexing.

In FIG. 2, the signals of each character information screen output from the character multiplex signal separation processing circuit 4 are written into memories 22 l, 222 , . . . , 22 through terminals ′ and 20, respectively. A control signal for writing in this case is output from the control circuit 23. The terminal 21 is a terminal to which signals necessary for the control operation of the control circuit 23 are supplied, and at least signals necessary for the memory write control are supplied from the character multiplex signal separation processing circuit 4.

Each memory 221, 22 . ．． ．． ..., 22nlko5
The data of each character information screen stored in the memory is read out from the control circuit 23. The frequency is converted by readout control using a control signal. As a result, each character information screen is
As shown in FIG. 4, the image is reduced to fit into a divided area 24 set within the divided area 14. Further, this reading is performed in a time-division manner for each character information screen, and the signal selection circuit 2
4 is sequentially read out to the terminal 25. As a result, the three areas 261, 2 shown with diagonal lines in FIGS. 5(a) to 5(f)
6□.

The text information screen is time-division multiplexed on H.263. Figure 5 (a
) to (f), the vertical direction of the region 27 corresponds to one field period, and the horizontal direction corresponds to a scanning line period. Further, FIG. 5 shows a case where the number of memories is three in FIG. 2.

Next, the configuration of FIG. 3 will be explained. In FIG. 3, frequency conversion is performed by a separately provided frequency conversion circuit 15, and only time division multiplexing is performed by the memories 22, 222, . . . 22n.
1 control circuit 23 and signal selection circuit 24.

The operation in this case is the same as that shown in FIG. 2, so a description thereof will be omitted.

The operation shown in FIG. 1 will be explained in more detail. In the following description, the aspect ratio of the display area 12 of the high-quality display 11 is assumed to be 16:9.

Figure 5 (a) output from terminal 25 in Figures 2 and 3
The character information screen signals time-division multiplexed in the areas 26t, 262, and 263 of (f) are subjected to time-division scanning line conversion by the scanning line conversion circuit 17 in FIG. 18. This 'composite screen creation circuit 16 displays character information screens in divided areas 141, 142, and 143 of the display area 12 of the high-definition display 11 shown in FIG. The signal of the character information screen and the NTSC television signal are combined so that the television signal screen is projected on the divided area 13.

As described above, in this embodiment, the signal of the character information screen of the NTSC system is subjected to frequency conversion and scanning line conversion to adapt it to the aspect ratio of the high-definition television system.

Therefore, according to this embodiment, even if the character information screen is displayed in the display area 12 of the high-definition display 11, it will not be distorted.

In addition, in this embodiment, in a configuration in which signals of a plurality of character information screens are time-division multiplexed, the frequency conversion of the signals is performed in the first stage of time-division multiplexing, and the scanning line conversion is performed in the second stage, so that multiple character information screens can be multiplexed. Even though the character information screen is time-division multiplexed, it is possible to prevent the circuit scale from increasing due to signal conversion.

FIGS. 7(a) and 7(b) are diagrams showing a second embodiment of the present invention.

This embodiment uses the area 271272 in FIG. 7(a) to multiplex 12 character information screens in areas 261 to 2612 between two fields, thereby creating a high-definition display 11 in FIG. 7(b). Divided areas 241 to 2 of the display area 12 of
412, 12 character information screens are displayed.

FIG. 8 is a diagram showing a third embodiment of the present invention.

The character information screen data multiplexed in areas 261+262 is frequency-converted and time-division multiplexed so that the width in the scanning line direction is twice that of the data in areas 263-26.

The scanning line conversion circuit 17 in FIG. 1 performs time-division scanning line conversion, and the composite screen creation circuit 18 separates and recombines the screen to create a divided area 14 of the display area 12 in FIG. 8(b).
．． The image is displayed so that 142 is the area of regions 143 to 146.

FIG. 9 is a diagram showing a fourth embodiment of the invention.

In this embodiment, the data of the character information screen multiplexed in the areas 261 to 26.1 in FIG. 9(a) are transferred to the areas 265 to 26.1.
The data is frequency-converted and time-division multiplexed so that the screen width in the scanning line direction is 1.5 times that of the character information screen data multiplexed on H.267.

FIG. 10 is a circuit diagram showing the configuration of a fifth embodiment of the present invention.

In this embodiment, the frequency conversion circuit 15 and the scanning line conversion circuit 17 shown in FIG. The first point is to perform time-division frequency conversion.
Different from the illustration. The rest is the same as in FIG. 1, so detailed explanation will be omitted.

Although several embodiments of the present invention have been described above, the present invention is not limited to these embodiments.

For example, in the previous embodiment, a case has been described in which an NTSC text information screen is displayed in the display area of a high-definition television receiver. It is generally applicable when displaying in a display area.

It goes without saying that this invention can be modified in many other ways without departing from the spirit thereof.

[Effects of the Invention] As described above, according to the present invention, the signal of the text information screen is subjected to Tanu's fZ conversion to deal with the difference in broadcasting formats, so the text information screen can be converted to the signal of the broadcasting format. It can be displayed without distortion in the display area of different TV set receivers.

Further, according to the present invention, at least a part of the signal conversion process is performed after time-division multiplexing of a plurality of character information screens. Despite the configuration, it is possible to prevent the circuit scale from increasing due to signal conversion processing.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention, and FIG.
The figure is a circuit diagram showing an example of a specific configuration of the circuit block A shown in FIG. 1, FIG. 3 is a circuit diagram showing another example of the configuration, and FIGS. FIG. 7 is a diagram showing the second embodiment of the present invention,
FIG. 8 is a diagram showing a third embodiment of this invention, FIG. 9 is a diagram showing a fourth embodiment of this invention, and FIG. 10 is a circuit diagram showing the configuration of a fifth embodiment of this invention. , FIG. 11 is a circuit diagram showing the configuration of a conventional high-definition television receiver, and FIG. 12 is a diagram for explaining the operation of FIG. 11. 1. 2.3, 20, 21.25... terminal, 4...
Character multiplex fQ number separation processing circuit, 5... Character information separation processing circuit, 6... Character information generation circuit, 8... Signal conversion circuit, 10... Signal switching circuit, 11... High quality display , 15... Frequency conversion circuit, 16... Time division multiplexing circuit, 1.7... Scanning line conversion circuit, 18...
Synthetic screen creation circuit, 19...Blanking level generation circuit, 221-22n...Memory, 23...Control circuit, 24...Signal selection circuit. Applicant's representative Patent attorney Takehiko Suzue Figure 2 Figure 1i Figure 3 (a) Figure 8 (b) Figure 10

Claims (3)

[Claims] (1) Television reception in which a television signal having an aspect ratio different from that of the display area is received, and a character information screen obtained from a character multiplex signal multiplexed with this television signal is displayed in the display area. a time division multiplexing means for time division multiplexing each signal of a plurality of character information screens obtained from a character multiplexed signal and composing the plurality of character information screens into one screen; a signal converting means for converting a signal to match the aspect ratio of the display area, the signal converting means performing at least a part of the signal converting process after the time division multiplexing process of the time division multiplexing means; A television receiver comprising a composition means for separating and resynthesizing a composite screen of the plurality of character information screens obtained from a signal conversion processing output and displaying the composite screen in the display area. (2) The signal conversion means is configured to perform frequency conversion before the time division multiplexing process of the time division multiplexing unit, and perform scanning line conversion process after the time division multiplexing process. The television receiver according to claim 1. (3) The signal conversion means is configured to perform scanning line conversion before the time division multiplexing process of the time division multiplexing unit, and to perform frequency conversion after the time division multiplexing process. The television receiver according to claim 1.