JPS59172893A - Character multiplex broadcast receiver - Google Patents

Abstract

PURPOSE:To make constitution inexpensive and to improve performance by presetting a number of a character program to a preset memory in a receiver extracting the character program during a vertical blanking period so as to display automatically the character program. CONSTITUTION:When the character broadcast signal of a preset number is extracted while no character program is displayed, a start signal Sf is outputted from an AND gate 22 to a control circuit 18, the extracted character broadcast signal is outputted to a display memory, a switching control signal Sa is outputted to the control circuit and the display is changed over into the display of character program. Then, the character broadcast signal stored in the display memory is outputted and the character program of the preset number is displayed automatically on a CRT. Thus, the character program is displayed automatically by presetting the number of a prescribed character program to a preset memory 19.

Description

[Detailed Description of the Invention] The present invention relates to a teletext broadcasting receiver/equipment that receives a teletext program multiplexed during the vertical blanking period of a child novision signal, and aims to improve the functionality of the teletext broadcasting receiver/equipment. With the goal.

Conventional 5-character multiplex broadcast program transmission method: An old pattern method in which two characters and figures are separated into pixels and transmitted.

A code method that encodes and transmits characters and figures.

In either case, a portion of the text program is transmitted in the form of a teletext signal in the form of a teletext signal for each scanning line during the vertical blanking period of the Te1/Vision signal by a teletext receiver.

Therefore, the teletext receiver stores the two teletext signals in a display memory and displays one screen of the teletext program.

Therefore, in the case of the pattern method, it takes a maximum of 4 seconds to form a text program for one screen, and an average of 2 seconds when taking into account the time difference due to different display modes.

The display modes include a full fixed display mode that displays text programs on the entire screen, and a fixed display mode 2 that displays text programs statically superimposed on TV programs in synchronization with TV programs. A subtitle display mode in which a text program is displayed, and a full vertical scroll display mode in which a text program is displayed while being moved to the left side of the screen are proposed.

A conventional teletext receiver of this type is constructed as shown in FIGS. 1 to 3.

In those drawings - (1) rri antenna, (2)
is the tuner connected to the antenna (1), (3) is the TV program selection section connected to the tuner (21), (4)
is an intermediate frequency amplification/detection section (
(hereinafter referred to as wave detection section), (58f'i detection section (4)
As shown in FIG. 2, the television program receiving section (6) is connected to the display changeover switch (7), the first contact (a) of which is connected to the receiving section (5), and the switch (7). The mixing section (9) has a switching control circuit ('8') and a cathode ray tube (hereinafter CR) connected to the switching piece of the switch (7).
(referred to as T) to form five display sections. The selector switch (7) is an electronic switch.

nB is a character extracting circuit connected to the junction (4), which extracts the teletext signal multiplexed during the vertical blanking period of the television signal. (]1) is a buffer memory connected to the character extracting circuit 90, which holds the program number of the extracted teletext signal.

(121 is a selection number memory that holds the number of the character program specified by the program selection operation.

(131 is a number matching circuit that collates the numbers in both memories 111+ and +121 and determines a match or mismatch and outputs a match MIJI signal and a mismatch detection signal; (14; is a character extraction circuit C11; both memories 1111, +121;
It outputs a signal that controls the operation of the number matching circuit (13j), and also outputs a teletext signal of the specified teletext program using the match detection signal of the number verification circuit (13).
15j is the composition force/raral character extraction control) 11X indicated by the broken line in FIG.

116) is a display memory whose input terminal is connected to the control circuit t141, and whose output terminal is connected to the second contact (1) of the changeover switch (7).

(1η is a part of the operation keys connected to the control circuit (]4), including the display command switch for character programs and the number 4 of the character number thread H.
10 advance keys are provided for determining the purpose.

When displaying a text program, the teletext signal multiplexed with the television signal is sequentially extracted by a character extraction circuit (1L3), and the program number of the extracted teletext signal is held in (Tsufamemo+) till. be done.

Ichiriki, part of the operation key (17) program selection operation (from the following):
3-choice number memo January 12) The number power of the specified character program; ゛1 is retained.

When the numbers in both memories +lil and fi21 match, the match detection signal of the number matching circuit (12) is also marked 7, and the control circuit (141) displays a display memo on January 1, indicating that the teletext signal of the specified teletext program is displayed. is output and the display memory (
The above letter jl in (translation)! As the transmission signals are accumulated, the teletext signal of 1 display memo IJ (i61) is outputted in synchronization with the synchronization signal of the television signal.

In order to further display a 5 character program, the control circuit (14)
From the control circuit (8), the K switching control word Sa is output, and the switching switch (7) is switched according to the 1 display mode.
Q610 teletext signal size t is a mixed signal of the teletext signal and television signal that is output to OR, T (9), and C
The specified text program is displayed at RT (9).

In the olden days, if the waiting time from program selection to display section wait time was 20 seconds, it was possible to transmit IQiii screens, or 10 character programs, in one scanning line during the vertical blanking period mentioned above. It is said that it is actually possible to transmit an IQ character program on one scan line.

If you wait for the selected text program while watching the displayed text programs, the 20 seconds of waiting time will not feel long, but the wait time of 20 seconds at the time when the first selected text program will be displayed. The second feature is a multi-page memory, which stores text programs in advance, and when selecting two programs, transfers the text programs in the page memory to the display memory, reducing waiting time. It is desirable that the number of multi-page memories v'i5, which is designed to be displayed, be equal to the number of text programs to be transmitted, but this has the disadvantage of being very expensive.

- For example, even if a text program in subtitle display mode is received, the user operates the operation keys IIη in advance to select the text program in subtitle display mode.

If the receiver is not controlled to display text programs, the receiver will be distracted from displaying television programs, and the text programs in the subtitle mode will not be output from the display memo 161 and will have the disadvantage of being missed.

This invention was made with the above points in mind,
A character extraction circuit for extracting a character program multiplexed during the vertical blanking period of a television signal, a part of operation keys for specifying the number of the character program, and a number designated by the part of the operation key is held. a number memory; a control circuit for outputting the matching character program of the character extracting circuit to the display memory; In the teletext receiver, the teletext receiver is equipped with a display unit that selectively displays the upper part of the screen, a preset memory that holds a preset number specified by a part of the operation, and a control circuit that stores the characters of the character extraction circuit. a number matching circuit for detecting a match or mismatch between a number and a number in the preset memory; An output means for outputting a character program from the character extraction circuit to the display memory, and an output means ld for outputting the character program from the character extraction circuit to the display memory by inputting the minus detection signal during the non-display period;
Set up a separate output screen to switch i to text program display.
The present invention provides a teletext broadcasting receiver characterized by the following features.

Therefore, if the regular teletext receiver (according to the text) is equipped with a 144 input means in the control circuit, when the character program with the number set in the preset memory is received when the 2 character program is not displayed, Since the text program is automatically stored in the display memory, by switching to the text program display after the display memory is stored, the text program can be displayed during waiting time.

In addition, if an output control means is provided in the control circuit, if a character program with a number that has been blanked out in the preset memory is received when r, l, or character silk l is not displayed, white @14 l will be displayed.
At the same time, the text program is stored in the display memory and the second display section is switched to display the text program.

For example, you can reliably watch a text program in subtitle display mode without missing anything.

Next, this definition will be explained with reference to the drawings from FIG. 4 onwards, which show an example of the invention.

First, FIG. 4 showing an embodiment will be described.

In Fig. 4, the same symbols 14 as in Figs.
9) is a precent memory, t2o, which holds the number of the character program preset by the operation of the operation key f17).
+ The first one that determines whether the number of the tri batza memory C11) matches the number of the second selection number memory (121) or not.
1211 U-buffer memory C11) and the preset number in the preset memo January 19) No. 2 Tanma combining circuit, 122) is the 2nd Tanma combining circuit. ;21) theory I (hereinafter referred to as II 111)
The first AND gate 123) receives the -minor detection signal Sb of 7), and the second AND gate 123) receives the Pavi discrepancy detection signal Sc of the @2 number Tanzen circuit (21).

The control circuit (18) controls the II when displaying a television program.
+11 TV mode signal Sd is AND gated (2
21, and when displaying the character program of the preset number, °
1" automatic mode signal 8e),!231
Output to.

The control circuit 181 fd was deleted, and the characters were also omitted during the display period of the TV program [I! circuit 10 extracts the teletext signal).

And the non-display period of the text program, that is, the TV number *11
During the display period, when the teletext signal of the precent number is extracted and /'L, the start signal Sf of '1'' is outputted from the first AND gate 1221 to the control circuit (18j, and at this time, the control circuit (18 operation of the output splitting means (), the extracted teletext signal is sent to the display memory n1 in Figure @1.
ilKl:IJl, and outputs a switching control signal Sa to the control circuit (8) in FIG. 2 to switch to display of a text program.

In addition, 1 display memo IJ t+i;
/C 1st and 1st timing" and switch (7) shown in Figure 1.
) and from the mixing section (6) in the same figure to the CRT C9)
The teletext signal or mixed signal is input to the CI (
・T (9) The text program with the vc preset number is automatically displayed on the IC.

At that moment, the teletext signal with the preset number is
When the text program is no longer displayed, a stop signal Sg of 1'' is output from the AND gate t231 to the control circuit (18), and the automatic display of the text program is canceled.

Therefore, if you set the number of a predetermined text program in the preset memory 1J9) VC-fv subtitle display mode as a preset number, the reception of the teletext signal of that number will automatically switch to the i11 S display mode. The text program is displayed, and the desired text program can be reliably viewed on VC.In this case, since no multi-vane memory is provided, the system can be constructed at low cost and the performance can be improved.

Finally, Figures 5 and 6, which show other real sister examples, will be explained.

Those figures i? i7, Figures 1 to 4 and 1
"]j-symbol is the same or
(24) is a circuit on the open side provided in place of the control circuit (J8) in Figure @4, and (25j is a collation selection circuit into which the display discrimination signal sh of the control circuit (24) can be inputted, and is used for 5-character programs. During the non-display period - that is, during the display period of a TV program, the precent number in the precent memory 119) is output to the number matching circuit f131K, and when a character program is displayed, the number in the selected number memory (12) is output to the number matching circuit. +:I31
K 1-11 Force.

The control circuit 124) also controls when displaying a television program.
In addition to controlling the character extracting circuit 'i01 to extract the teletext signal, the preset memory (19
) and the number of the extracted teletext signal match, based on the match detection signal of the number matching circuit (13), the extracted teletext signal is displayed in the display memo 'J of Figure 1. It has an output means for outputting 1161K.

Further, from the control circuit t24), the verification selection circuit 1251
As shown in FIG. 6, the display program discrimination signal Sh outputted from the K output commands the display of a text program by operating the operation key 117) and selects 1: number 1, 1 + 12 + tx time slot in which the K number is entered. Select the TV program display with Verification circuit (25
), 1. The display of the text program will end from X o'clock.
, y hourly character program display one selection matching circuit (25jVc
command.

Note that Ta in FIG. 6 indicates the actual display period of the television program, and Fil indicates the actual display interval of the text program.

Therefore, preset memo IJ 191 K, preset the number of the frequently selected character program, and dial I;
Memo'J fe6
For example, 1. ) After the time, operate part of the operation keys (17) to set the letter number of the preset number,
If you select I, the text program can be displayed without waiting time, and in this case, it is also inexpensive because it does not require multi-page memory (C to improve performance). I can do it.

By the way, in order to eliminate waiting time, for example, a teletext signal is stored in the display memory before the common display of a TV program for four months, and during the common display, the text @
When switching to the display of a set and displaying a text program based on the text broadcast signal in the 1 display memory, the configuration may be as shown in Fig. f and 7.

In Figure 7, the same symbol as in Figures 1 to 6! /′
+26+ is a character extraction control unit provided with VC instead of the control unit 1151 described above, and when the operation key Outputs the display command signal S1- of ''. C27) The input terminal of b-force is connected to the open side part (26), and the third AND gate is connected to the control circuit (8) K. (28) has one input terminal connected to ili control 7 (1(28)).
It is an OR gate connected to 126+, and its output terminal is connected to the other input terminal r of the AND gate (2η).

129) consists of a lock type switch (
(1) is grounded, and the switching piece is connected to the input terminal VC of the other power of the control section (26) and the OR gate pad 28. "31) is a display timing control circuit consisting of the constituent forces indicated by the broken line.

The ILT control station (26) also extracts the teletext signal during the display period of Te1/Viban, and, for example, operates part of the operation key (!7) before displaying a commercial to select the number of the desired teletext program. is output to the selection number memory of the control KIE +26), and the switch f29) is set to the on contact (d). K
Accumulated.

-Power 2 display memo! J + 161 When the K text broadcasting signal is accumulated and can be displayed &C, the switching control signal Sa from III Mito (26) is input to the AND gate (2η, but at this time, part of the operation keys) 17) Since the character program display switch is not turned on, the output signal of +28+ does not become "1", and the control signal Sa is not output from the AND gate (271) to the control@1 circuit (8).

Therefore, before the commercial is displayed K (r:l,
Display memo! J++61K Text broadcast signals are accumulated, but it is difficult to switch to display text programs.

At the same time, when a commercial starts to be displayed, some of the operating keys (when the character program display switch of 1η is turned on, the control @ 1261 starts the or game) +281 K display command signal Si is output and the or game) +28+ i = [ When the input signal becomes '1'', the AND gate 1271 switches to the control circuit (8) and outputs the signal Sa to be used, and display memo 1.1 +161K The accumulated teletext signal or mixed signal is displayed on the CRT (g) output to CRT19) [
, text programs are displayed without waiting time.

In the case of Example 1, the text program can be displayed without waiting time even if the control@j section (?6) is equipped with a preset memory, etc., and -1i4 is inexpensive and 11 performance is low. I am able to direct this.

In addition, the on/off switch] 29) is a part of the operation key (17)
It may also be provided in the control circuit 131) to control the parts other than the switch) 29). j(;2et K may be incorporated.

Furthermore, when the display memo IJ++61K teletext signal is accumulated and reaches the displayable format, an indicator can be turned on to notify the user.

1121 (ri) A block diagram of a conventional teletext receiver, Figures 2 and 3 are a detailed block diagram of a part of Figure 1, and Figure 4 is a block diagram of a conventional teletext receiver. The following drawings show embodiments of the teletext broadcasting receiver of the present invention; FIG. 41 is a block diagram of the main parts of one embodiment, FIG. 5 is a block diagram of the main parts of another embodiment, and This figure is a waveform diagram for explaining the operation of FIG. 5, and FIG. 7 is a block diagram of main parts of still another embodiment.

(6)...Mixing section, (7 doors...Display changeover switch, (8)...Switching control circuit, (9 doors...Cathode ray tube, lIQ...Character extraction circuit, (11)... Buffer memory, (121...Selection number/month memory, ++31
, 1201, Tsu1)...Number matching circuit, ++51
, '261...Character extraction control section, 116)
... Display memory, (17) ... Some operation keys, 1181
, +24+...operation control circuit 1, (19)...
Precent memory, +221, +231, 'jun...and gate, (25j...verification selection circuit,
128)...OR gate, 129)...Display timing control changeover switch, =nj...Display timing control circuit.

Agent: Patent Attorney: Fujita 11μ Figure 1 Scales 2 −−−−−−−−−−−f−5−−−−−−“ Figure 7

Claims (1)

[Claims] ■ A character extraction circuit that extracts the multiplexed character boxes during the vertical blanking period of the television 7-on signal, an operation key for the character number designation port, and a number specified by the part of the operation key. a number memory for holding the number memory, a shouting circuit for outputting the character program of the character extracting circuit corresponding to the number of the number memory to the display memory, and a control ζC of the control circuit to output the character program of the display memory and the character program to the display memory. In a teletext receiver equipped with a display section for selectively displaying a TV program based on a 1/binyon signal on a screen, a precent memory that holds a precent number designated by a portion of the operation key; , the control circuit includes a number matching circuit for detecting a match or mismatch between the character number of the character extracting circuit and the number of the preset memory; Output means for outputting the character program of the character extraction circuit to the display memory upon input of a match detection signal of the collation circuit; A teletext broadcasting receiver characterized in that it is provided with an output control means for outputting to the display memory and for switching the display section to display a teletext program.