JPS6233430Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display mode identification display circuit for teletext programs.

NHK's C56 specification is currently being proposed as a television text multiplexing system. This specification is approximately
It is characterized by transmitting the index of the program currently being transmitted among the 100 programs. In addition, the display modes according to this specification include (1) full-scale fixed display mode in which static characters are displayed over the entire screen on a background of a predetermined color, and (2) a full-screen fixed display mode in which static characters are displayed across the entire screen on a background of a predetermined color, and (2) a display mode in which static characters are displayed over the entire screen on a background of a predetermined color. Super fixed display mode that displays static characters superimposed, (3)
(4) A subtitle display mode that displays static characters related to the broadcast and the content against the background of the TV broadcast screen; (4) A subtitle display mode that displays characters moving from right to left on the bottom line of the screen with the broadcast screen as a background, except for one line; There is a full vertical scroll display mode that moves from the bottom to the top.

Therefore, for example, if a viewer wants to enjoy text information such as news or weather forecasts while enjoying a TV program such as a drama, the above-mentioned news that is sent in super fixed display mode or single-line horizontal scroll display mode may be used. It is necessary to select a text program such as. However, the program index display on conventional teletext receivers simply lists the program numbers of the teletext programs being broadcast and displays them on the TV screen, so news and weather forecasts can be viewed from this display. Even if it is known that the broadcast is currently being broadcast, it is not possible to directly know in what display mode it is being broadcast, and therefore, the viewer must refer to a separate program guide on printed matter, etc. It was an inconvenience for people.

Therefore, the present invention aims to propose a new and effective display mode identification circuit that also displays the display mode when displaying the program index.

Below, before explaining the present invention, in this specification, each of the above-mentioned items will be explained while the program index is being displayed, that is, each program number of all character programs currently being broadcast is arranged and displayed on the TV screen. The arrangement of data packets required to identify the display mode will be explained. First, the program index packet (PIP) that interpolates the number information of the program being broadcast is in the 6-byte header section.
A 2-byte clock line, a 1-byte Fleming code, a 1-byte service identification code and interrupt code, and a 2-byte data identification code are arranged, and a 31-byte information data section includes a 1-byte program index. A packet number code and a 2-byte transmission program code are respectively allocated, and a page control packet (PCP) that is sent in advance of programs other than single-line horizontally scrolling programs has a header section similar to the program index packet. The information data section includes a 2-byte program number code, a 2-byte page number code, a 1-byte erase code and update code, a 1-byte display control code, and a 1-byte raster background color code. , a 1-byte page header background color code and 23 bytes of spare bytes, and a horizontally scrolling data packet (HDP) containing information about a 1-line horizontally scrolling program is a program index packet (PIP). A similar header section is arranged, and the information data section contains a 2-byte program number code, 1-byte stop code and update code, 1-byte spare byte, and 1-row horizontal scroll pattern data for 12 columns. It consists of each arrangement.

The display mode of a program can be identified by detecting the contents of the page control packet and horizontal scroll data packet, and FIG. 2 shows the relationship between the display mode and the contents of the data packet. In other words, if the interrupt code indicates "no interrupt", it can be identified that the full fixed display mode or super fixed display mode is in effect, and if the data identification control code specifies HDP, the display mode is in horizontal one-line scrolling display mode. If PCP is specified, it can be identified that the display mode is one of the remaining display modes, and if the first bit of the display control code in the information data section is "1", it can be determined that the display mode is full vertical scroll display mode. Can be identified, and the second bit is “0”
If so, it can be identified that the display mode is the full-scale fixed display mode or the full-scale vertical scroll display mode.

In this embodiment, each code described above is detected to identify the display mode, and the broadcast program number in the displayed program index is displayed in color according to the display mode.
Its operation will be explained with reference to the circuit block diagram shown in FIG. First, in this example as well as in the conventional example, 5 to 5
Program index packet (PIP) transmitted every 6 seconds
is identified by the data identification control code, the broadcast program number is stored in the number memory, and the broadcast program number is displayed as a program index on the TV screen according to the display command, and the clock line and framing code in the data packet are The data identification control code in the data packet is latched by the data identification control code latch circuit 2 in synchronization with the output of the synchronized latch pulse generation circuit 1, and this latch output is input to the PIP identification circuit 3 to identify the input of the program index packet. Based on this identification output, the broadcast program number latch circuit 4 is activated to latch the broadcast program number while storing it in the number memory 5, and transmit it while synchronizing with the television signal according to the display command output (not shown). The program number code is being sent. Note that the output code is converted into a pattern signal via a character generator (not shown) and input to the television receiver.

In this embodiment, the transmitted program numbers displayed in this manner are colored according to the display mode. Therefore, in this embodiment, an interrupt code latch circuit 6, a program number latch circuit 7, and a display control code latch circuit 8, which are synchronized with the latch pulse generation circuit 1, are arranged to generate an interrupt code in addition to the data identification control code. The program number code and display control code are latched, and each code is sent to an interrupt identification circuit 9, a PCP identification circuit 10, an HDP identification circuit 11, a first bit identification circuit 12, and a second bit identification circuit 13. The code is entered to identify the display mode. This embodiment further selects this identification output to identify five types of display modes, and the entire fixed display detection circuit 14 outputs the non-interrupt output (a) and the PCP
The identification outputs b, fixed display output (d), and no super output (e) are input, and the super fixed detection circuit 15 is fixed to the no-interrupt output (a) and PCP identification output b. Display output (d) and output with super
Each identification output is inputted to the subtitle detection circuit 16.
inputs the identification outputs of output (a) with interrupt, PCP specified output (b), fixed display output (d), and output (e) with superimposed display, and the one-line horizontal scroll detection circuit 17
The HDP identification output is input, and the full vertical scroll detection circuit 18 outputs an output with interrupt, a PCP identification output b, a scroll output d, and an output without super.
Each identification output in (e) is input. Therefore, the display mode detection output is input to the color code generation circuit 19, converted into a color code, inputted to the color memory 20 of 3 bits per data, and read out together with the broadcast program number code. Therefore, the color memory 20 stores the latched program number at the address corresponding to the address of the program number code. When the code in the program memory and the transmission number code match, the color memory 20 having the same address designation as the number memory 5 is stored. A color code is stored, and since the broadcast program number code and color code are stored at the same address in separate memories, they are read out at the same time. The color code generation circuit 19 has 3 bits corresponding to the three primary colors of RGB, and among the five display modes, the full fixed display mode is red, the super fixed display mode is green, and the subtitle display mode is yellow and one line. Horizontal scroll display mode is cyan,
The color code is specified so that the full vertical scroll mode is magenta. In addition, the color code generated from the color memory is input to a color modulation circuit (not shown) together with the output of the character generator, and the generated modulated color signal is mixed with the pattern signal (luminance signal) described above to produce a color video signal on the television. It is input to the digital receiver.

In this embodiment, the index number is colored according to the display mode, but if necessary, the number of the program currently being transmitted can be displayed in a blinking manner, so that it is possible to immediately check which program is currently being transmitted. can. For this purpose, if the output of the character generator is turned on and off based on the coincidence output of the comparison circuit, the numbers can be made to flicker.

As described above, according to the present invention, when displaying a program index, it is possible to simultaneously display the program number of the text program being broadcast and the display mode of each program by the color of the program number. If you want to watch text information such as news while enjoying a program, you can directly find out from the program number above whether the text information is superimposed on the TV image in super fixed mode or single-line horizontal scroll mode. The desired text information (text program) can be selected immediately and easily. In addition, when watching a foreign TV program such as a foreign movie, you can also directly know whether the foreign movie is currently being broadcast as a subtitle supertext by checking the program number of the text program. You can easily call up and display the supermarket.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a data packet of a teletext system that adopts the present invention, Fig. 2 is a diagram showing the relationship between display modes and codes, and Fig. 3 is a block diagram of an implementation circuit of the present invention. . Explanation of main drawing numbers, 9... Interrupt identification circuit, 10...
...PCP identification circuit, 11... HDP identification circuit, 12
...First bit identification circuit, 13...Second bit identification circuit, 14...Full surface fixed detection circuit, 15...Super fixed detection circuit, 16...Subtitle detection circuit, 17
...One-line horizontal scroll detection circuit, 18...Full-face vertical scroll detection circuit, 5...Number memory, 20...
...color memory.

Claims (1)

[Scope of utility model registration request] A TV character multiplex signal in a format in which an interrupt code, data identification code, and display control code are inserted into one data packet is received, a program index packet in this character multiplex signal is detected, and a program index packet in the packet is detected. By storing the broadcast program number code in a number memory, reading out the program number code in synchronization with the television synchronization signal, and converting it into a pattern signal using a character generator, the program index of the teletext program being transmitted can be obtained. In a teletext receiver configured to display on a television screen, a plurality of identification circuits each identify an interrupt code, a specific code among data identification codes, and a display control code of a character signal being received. , a detection circuit that obtains each identification output and detects the display mode of the character signal, a color code generation circuit that generates a color code signal according to the detection output, and a program number code extracted from the character signal that is being received. and a circuit that detects a match between the color code and the broadcast program number code read from the number memory, and derives the output of the color code generating circuit at the timing when the matching output is obtained; A display mode identification display circuit for a teletext program, comprising a color memory for storing readable data corresponding to the display mode.