JPS5875989A - Receiver for character broadcast - Google Patents

Abstract

PURPOSE:To minimize the necessary number of connections, and to obtain an eacy-to-see screen, by decreasing the brightness of background video only where character information is superimposed when the character information is displayed while superimposed on part of the television screen. CONSTITUTION:To superimpose character information of a received character broadcast on a usual television screen, a switch 11 is placed normally in an (a)-(b) short-circuit state, or in a (b)-(c) short-circuit state only while primary color signals for character information display are present. To perform said switching, a control signal for the (b)-(c) short-circuit state is supplied to the switch 11 while the output of the brighteness memory in character signal processing circuit 15 is ''1''. Then, the DC level of a video signal for background screen display is controlled to decrease the brightness level of the video signal corresponding to the character information display part, and also to delay primary color signals R, G, and B for character information display by about 0.5mus, thus compensating the delay of signals of a color television tube.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention can be applied to multiple TV screens;
Regarding a single/cup type device that receives character information transmitted by 7.1, when the character information is displayed on a cathode ray tube 1 of 7. ) Set the brightness of the background screen for the part where one character is entered to low I・N−N−C1,,1B・
-1 friend small match- and teletext parq/
To provide a device capable of minimizing the number of continuations between f+ 1!71 (and 7-game TV)
3. Receive it with a receiver in the evening format, and send the information to a friend /C By converting the R, G, and B primary colors A and 1T (converting them and supplying them to the monitor TV together with the video signal for the television screen), the negative (1ν) Shijinyon screen and its -r?l
(Information information + 11i units - ton) l'll: l/-(-I'm not doing anything to display it.
In order to make the text information easier to read, the sentence 'f'l
The television screen in the background is darkened to the extent that it displays the '1' mark. However,
In a conventional device of this kind, a control signal for darkening the background of a text information display area is sent to the text broadcast receiving unit through another route separately from the video signal described in -1- and the R, G, B primary color signals. Since the power was supplied from the Atabuta to the monitor TV, there was a drawback that there were a lot of cables and terminals needed to connect the two.

SUMMARY OF THE INVENTION Therefore, the present invention eliminates such conventional drawbacks and provides a device that can minimize the number of connections required even when controlling the area where text information is superimposed and displayed to be dark. The purpose is to In order to achieve this objective, the present invention provides a video signal for displaying a background screen on a monitor television and an R-signal for displaying text information.
The primary color signals of G and B are sent and received in a certain number of characters (supplied from part A), and the video signal for displaying the television screen in the background is controlled and processed in advance by the teletext receiver to receive character information. Image value at display position - to number/1
/ to 7'mei Mr. + i-, 4, 1: y) VCl,
1r-C is the one that collects the cow, 1. In this way, the monitor TV vc fRIn-J
It is possible to darken the background of the 11 video signals that are displayed on the background.
', 11 people supplying the earthworks to TV, 1 and 1. This allows the number of connections between both to be minimized.

Hereinafter, regarding the present invention, the following aspects of the present invention:
1 teaspoon 21 and then 11 (I will explain to 1 night 11, without cutting out, in Figure 1, this is the -・') Z example order 1
”, 11,1. Parts 1 to 11 in the figure indicate II formation &;l: November 9 (Suino f- and j
This is a color-1 television receiver. 1d, chi, -li-VIF and 0/video detection circuit, 1 false image transmission and 4.5 MHz S IF
(,, Full output as shi3. 2Q; 1 buffer anzo'T
, outputs the video L rshij of the end f A 3 l\1VP-P (76iA economic theory).

3-゛t''F Demodulation of voice multiplexed signal g, left 1 to end r41
Output the right signal to 1 □ and 4 f A2 as 71 each - noise out (level) v ) 5, 9" l
'! 10C1 video L i 'j Internal/external switch for 10C1 video input. 4. Audio main amplifier, 5.
is the video signal person Kahanofaanbu. 6 is NTSG
A signal decoder processes the video signal and outputs R, G, and B baseband primary color signals. The final components are a synchronous separation circuit, a 111AFC oscillation circuit, a vertical output circuit, and a horizontal output circuit.

This is a deflection system circuit that includes a high voltage generation circuit, etc. 8 is R.G.
The output amplifier for each B primary color signal outputs a signal for driving the cathode of the cathode ray tube. Reference numeral 11 indicates R4 and B primary color signal outputs for displaying text information from the teletext receiving unit (portions 12 to 17 in FIG. 1) as an adapter, and a decoder 6.
This is a high frequency analog switch for mixing or switching with the R-G-H primary color signal outputs from the R-G-H signal output. These 1-1
1, the parts other than the switch 11 have the same functions as a combination of a so-called TV signal tuner and a video J-type monitor TV. v Describe. 12 is a Cicona VIP/video detection circuit similar to 1, and 1
3 is a buffer amplifier similar to 2, 1 and 14 are 1 and 1.
91 minutes 1 color subcarrier peak-ox circuit, these 12-1
4's function t-1, "Yamatsune's 1" white: 1φtun is similar to those in the built-in TV, (Ruru 1, 16 ← J received number of characters sent) ° processing circuit, for example, 11T blanking period (
Remove the teletext signal from the 20th HiVC tuntatami-X in
Only the hail signal a is sequentially stored in the pattern memory and color code memory for one screen, and the shade (191νrY, :;
The waterwheel is read out in accordance with the vertical scanning.
■For friends (7) R・G -B Nohara fQ Shinsugito 1'J
J conversion system W1111. i し;' (!: 4) end-rB
When displaying 1° character information transmitted to terminals A9 to AI2 via terminals A9 to AI2 via terminals A9 to B12, selector switch 11 is turned on to output signal 8.
So, increase 11j, shade 1 to tube 1-, 21st IA.

Character/graphic information as shown in B is displayed. When displaying text information superimposed on the - section of a normal TV screen on the 1011 screen of an A4j cathode ray tube, when displaying only text information on B←l, o 16k1 teletext signal processing circuit 15 R・G・B of output 7. lil (cone coater that changes the g signal output to NTSC power type 1 image signal υ, 17 tlJen: r -ri 16 (1),'
To the adventure, 1. This is an RF modulation system that modulates an RF carrier wave and converts it into an RF signal.

Now, in the apparatus shown in FIG. 1, when receiving teletext, d operates the operation button (or switch) for teletext and sends the open side 1 output from the character number transmission processing circuit 15 to terminal B5. Tell B8 and turn switches 9 and 10 b
-C connection state. As will be described later, the switch 11 changes the output for control θ41 at the terminal B12 at high speed and a
By rapidly switching between the connection state between -b and the connection state between 5 and 0, a superimposed display such as "=U" in FIG. 2A may be displayed.

Now, when text information is to be superimposed on a part of the television screen of a normal television program as shown in Fig. 2A, the part where the text information is displayed is shown in Fig. 1. The brightness level of the video signal of the background television screen (the part surrounded by the broken line) is lowered to
The text information will be easier to read if the brightness of the text is lower than the superimposed text information.

Is it possible to connect the Monitor Telehi and the 111 characters sent and received in Figure 1? If only the te terminal is connected: %+I.

Terminal B 4 Color projection (m panofa anthology 5 and de chopsticks 1-
The image 1) is transmitted to the switch 11 via the switch 6.
1.7 to partially reduce the brightness level of the setting
In a bunch. 1- In addition to terminals A9 to AI2, provide a connecting wire to the terminal -r of the other terminal, and connect it from the teletext receiver to -1-.
Add side angle 1 signal to the second TV, and then
II for output background screen display of 1-I-6; 1 telegraph screen 3
If you have to lower the DC level of (or v1 movie IL4! Shinjino) 4・ga -r lc.

In the present invention, the background screen sound of the character information display part without adding the edge -r- or Kusol total 1.1
This means that the brightness can be lowered.

On the normal television screen as the background, "rlli,'
+′y.

Ni ": Character information received 4 Futama Tatami 1 To be a person, switch 11 is usually IT A -B 1111I ~
Character 1 R, G, B primary colors for blue report display (short circuit between b and c only during the period when No. 11 exists)
It's dawn on 1, 7I-bai. This 1) J change kl
, to terminal AI2, the period during which the information information is present, that is, the period when the output of the luminance memory (pattern memory) in the teletext signal processing circuit 15 is "1" (looking at the R, G, and B primary color signal outputs, It is sufficient to supply a control signal to switch 11 to short-circuit the switch 11 during the period in which the OR output of the three primary color signals R, G, and H is "'1".
1 can be easily realized with an analog circuit made into an IC, or an analog game 1- consisting of a run transistor, a diode, etc.

Next, a description will be given of means for lowering the brightness level of a video signal for background screen display at a character information display position. First, in the current general color television receiver circuit, the end: f A 4
After applying the signal to the switch 11, approximately 0.
A delay of 571 Sec occurs. Therefore, by using the video signal for displaying the background screen out of the output of the character number transmission/reception (M-signal processing circuit 15) as shown in FIG. At the same time, by delaying the R-G/B primary color signals for displaying character information by approximately 0.5/7S, the part that lowers the brightness level of the video signal by 1. ``Go forward by the amount of time'': It is necessary to keep it that way.
(To do 3, that is, the t that is currently being tested in 11 books)
In the method of 7-radiation 1γ, the low luminance]'1' is converted into 51te by the combination of 4 pino I- and 1 pin I of the color designation codes. A color is designated for each dot in the 8 boxes of character information, 1 character, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, and 8 characters. i+Y (-3, the same specification for the brightness reduction area is also possible) 71. Therefore, there is no difference in the reliability of primary colors for character information display. Therefore, the fourth
As shown in the figure, the R, G, and B primary color signals and switching signals are transferred to 175
n5ec glue 11. Rino 3 Pino I ゛ minutes is about 0.
It is better to set 57zSec to 191 (τN).

Note that this signal delay means includes circuits 11 and 1 of
．． According to 17th Sei.

23 This is a circuit that controls the DC level of the I image absorption I ti for displaying the phantom background to increase the luminance level /l/ of the background screen to 11.1, which is the back of the output of the processing circuit 20. The level system 6111 signal Z is 11\ [8-bit width 1
No. 1 (also &1, a signal with a width that is an integer multiple of &1). This figure 4 shows a part of the broadcast signal reception processing circuit 15, and 22 is the image (I) of the output of the tuner VIP video detection circuit 12.
There are 7 pedestal crank circuits that run the F+ pedestal. The output of the vedestal clamp circuit 22 is applied to the level control circuit 23, and the luminance level of the video signal is reduced only during the period when the level control signal Z is at a low level.

The processing circuit 20 processes a luminance signal and a color code memory 19 for receiving characters from a luminance signal memory 18 which is a character information memory.
Using the 4-bit output from , which specifies the coloring of each character, the R-G-B primary color signals for displaying character information and the logical sum of the R-G-B primary color signals are formed. and,
In addition to supplying them to the delay shift register 21, a level control signal Z for lowering the background brightness level is also generated. For example, when all of the R, G, and B primary color signals are "'0", that is, "black", and the display mode 1-' is the superimposed display mode, the level control signal Z is generated. The control circuit 23 is constructed, for example, as shown in FIG. , 28
is its emitter lik 4jb, 291:Isui:y
-/- Ninc transistor, 1 in 30 its base leak l1 (4'+'
− is. A level system (fi) is applied to the output of the circuit 20.
l (ij > j is output), when the diode 31 passes 4 times, the base of the I. Sung-sung 29 turns 1, and the transistor 29 turns j+':1. Therefore, the co-minor t of the l-runsistor 24 is pulled to the ground side via the quartile 26 71. A video signal kJ' like the one shown in FIG.
It is also possible to clip the white side, as in B', due to the selection of J that flows through the board.

Therefore, according to the present invention, text information is superimposed on a part of the television screen. - When displaying a background image, the brightness of the background image can be reduced by changing the text information (i) and only the central part (i). When supplying the primary color signal of Nigu Telehihe B, the number of terminals for connection between the two can be increased by processing the video signal in advance so as to lower the level of the background screen of the text information display area on the attabuta side. and the number of cables can be minimized.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a teletext receiver according to an embodiment of the present invention, FIGS. 2A, B, and 3 are front views showing its display mode, and FIGS. 4 and 6 are partial views thereof. The block diagram and FIG. 6 are waveform diagrams illustrating its operation. 1...Tuner/VIP/video detection circuit, 2...
...Buffer amplifier, 5...Video buffer amplifier"
, 6... decoder, 7... deflection system circuit,
8.--Output amplifier, 9,10.11...
・Nuinochi, 12...Tuner/VIP video detection circuit, 14...Synchronization separation 9-color subcarrier regeneration circuit, 15...BunT broadcast signal processing circuit, 18.
Luminance memory, 19...Color code memory, 20...
...Processing circuit, 21...Delay circuit, 22...
...DC Tsuk9f circuit, 23...Level fGll
If 4 circuit. Name of agent Riju Satoshi Nakao Ri J and 1 other person Figure 2 Figure 3 Figure 5 Figure 6

Claims (2)

[Claims] (1) Receive a text information signal that is transmitted superimposed on a television signal, store and convert the text information signal to create an R4-B primary color signal for displaying text information, and -1
- A video signal for displaying the television screen of the above television signal, and a primary color signal of Juki R, 0, and B for displaying the text information on a part of the television screen. The video signal should be supplied to the monitor TV separately, and the video signal should be supplied to the monitor TV in such a way that the brightness of the position of the television screen where the text information is displayed is reduced. A teletext receiving device characterized in that the level of a portion corresponding to the display position is lowered in advance. (2) The position at which the level of the video signal to be supplied to the monitor TV is lowered should be set ahead of the delay time of the signal in the monitor TV by an amount of 11. / Nito is 11., l, sign! 1. “
N+i/l Claim 1st item tit:, 'Number of characters of l・k+7, Pa・So11j',! '! J:l'71.
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