JP4022700B2 - Multiple broadcast method of character program and receiver thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multiplex broadcasting method for a character program and a receiver thereof.
[0002]
[Prior art]
In FM broadcasting, it is called “FM character multiplex broadcasting”, and it is realized that digital data such as character information is frequency-multiplexed and transmitted to an original audio broadcasting program.
[0003]
This FM character multiplex broadcasting is called the DARC system, but the standard for multiplexing digital data such as character information is as follows.
Subcarrier frequency: 76 kHz
Transmission rate: 16 kbit / s
Modulation method: LMSK
Error correction method: (272,190) shortened difference set cyclic code product code
It is said that.
[0004]
The LMSK signal is frequency-multiplexed with the audio signal (monaural signal or stereo composite signal) of the original audio broadcast program, and the frequency-multiplexed signal is transmitted.
[0005]
Moreover, there are levels 1, 2, and 3 in program services such as character information, and all of them provide information such as characters and images by dot display. In the level 1 program service, the information is characters, and as shown in FIG. 8, the header area is 31 characters × 1 line (one character is 8 dots wide × 12 dots high), The body area is 15.5 characters x 2 lines (1 character is horizontal 16 dots x vertical 24 dots). One character program has a maximum size of 62 pages, and one page is 15.5 characters × 2 lines.
[0006]
As level 1 program services, news, weather forecasts, traffic information, entertainment, main complementary programs, and the like are considered. In this case, entertainment provides fortune telling, listener message boards, quizzes, town information, and the like. The main supplementary program is, for example, when the original audio broadcast is a music program, such as the song name, performer name, telephone number / FAX number at the time of request, etc. Information is provided.
[0007]
As other program services, “emergency programs” provided at any time when there is an urgent need is also considered.
[0008]
In addition, the program is given an 8-bit program number,
0: Total table of contents / first screen
1-253: General text programs (news, weather forecast, etc.)
254: Main supplementary programs
255: Emergency program
It is assigned like.
[0009]
The level 2 program service is a service for FM receivers that can display 15.5 characters × 8.5 lines including the header portion, and the information is characters and figures. Furthermore, the level 3 program service is an FM receiver that can display a detailed map on a CD-ROM or the like, that is, a traffic information service for a navigation system.
[0010]
[Data structure]
FIG. 7A shows a frame structure of a data signal multiplexed in the FM character multiplex broadcasting. One frame of this data signal is composed of 272 blocks, and each block has 288 bits.
[0011]
Also, 272 blocks in one frame are divided into 190 data packet blocks and 82 vertical parity packet blocks, and the vertical parity packet blocks are distributed and transmitted within the frame. The
[0012]
A 16-bit BIC (Block Identification Code) is added to the head of each block. Four types of BICs are used, whereby each parity packet is distinguished and the head of the frame is identified.
[0013]
A block of data packets has a 176-bit data packet following the BIC, followed by a 14-bit CRC code, and then an 82-bit horizontal parity check code.
[0014]
In this case, the CRC code is added to detect a residual error after error correction by the product code. The block of the parity packet in the vertical direction has a 272-bit vertical parity packet following the BIC.
[0015]
As shown in FIG. 7B, the data packet is composed of a 32-bit prefix followed by a 144-bit data block. The prefix is composed of a page number and the like, and this page number is 6 bits in size and is a value from 1 to 62. Therefore, as described above, one character program is the maximum. 62 pages.
[0016]
Further, the data block has a character code for actually displaying characters and a control code for controlling the display of characters.
[0017]
The above is the data format or display format in the DARC system. The broadcast station repeatedly transmits page data having the same content assuming that the page data cannot be received due to a reception error or the like.
[0018]
Since the data transfer rate and the frame size are as described above, the time required for broadcasting or transmitting one frame of data is less than 5 seconds (= 288 bits × 272 blocks / 16 kbits).
[0019]
[Example of character program display]
As shown in FIG. 6A, the FM receiver corresponding to level 1 is provided with a display element DSP such as an LCD, and its display area is 15.5 characters × 2.5 lines. However, among the display areas, the upper 0.5-line area is a header text display area, and the lower 2-line area is a text display area.
[0020]
When the FM receiver receives the text multiplex broadcast, the first page of the main menu is displayed on the display element as shown in FIG. 6B. When the first page is displayed in this way, if a predetermined key operation is performed, the second page of the main menu is displayed as shown in FIG. 6C. It is displayed in order.
[0021]
In this main menu, programs are prepared in a hierarchical manner. For example, when “3. Weather forecast” is selected from the main menu in FIG. 6C, sub-programs in the next lower program are displayed as shown in FIG. 6D. Menus “1. Today's weather” and “2. Tomorrow's weather” are displayed.
[0022]
Therefore, for example, when “2. Weather of tomorrow” is selected, as shown in FIG. 6E, “Tokyo (tomorrow) weather forecast”, which is the first page of the lower program, is displayed. When the second page is selected in this state, “Kanagawa tomorrow's weather forecast” is displayed as shown in FIG. 6F.
[0023]
Thus, since programs are prepared in a hierarchical manner in the main menu, the target text program can be displayed by following the programs in order.
[0024]
[Problems to be solved by the invention]
By the way, in FM character multiplex broadcasting, as described above, an emergency program that is provided at any time when there is an urgent need has been considered. When the receiver having the emergency program display function receives the character program data, the receiver checks the program number of the received data. If the program number is the emergency program number “255”, the receiver receives another character. The emergency program is displayed in preference to the program.
[0025]
However, this emergency program is limited in the case of emergency such as transmission of disaster prevention information, and cannot be used for other purposes such as breaking news or extras. Therefore, in general television broadcasting and radio broadcasting, typhoon information and information on major accidents may be broadcast with priority (interrupted) over general programs. In text broadcasting, such information is transmitted to general programs. Can not be displayed with priority.
[0026]
The present invention solves such problems and makes it possible to display programs such as typhoon information and election bulletins with priority over other general programs.
[0027]
In the following description, a function for displaying a given character program with priority or other interrupts is called “priority display”, and a character program displayed by this priority display is called “priority program”. Call. In order to simplify the expression, a character and its character code may be handled in the same way.
[0028]
[Means for Solving the Problems]
Therefore, in the invention of claim 1,
In a multiplex broadcasting method for multiplexing data of a plurality of character programs into a signal of an original audio broadcasting program and broadcasting the multiplexed signal,
Among the plurality of character programs, the character program data to be displayed with priority over other general character programs includes a specific character code, an operation position backward code, and a keyword character code in this order.
Method for multiplex broadcasting of text programs
It is what.
In the invention of claim 3,
In a receiver for receiving a text multiplex broadcast in which a plurality of text program data is multiplexed with the original audio broadcast program signal and the multiplexed signal is broadcast,
A receiving circuit for receiving the character multiplex broadcast;
A decoder circuit for extracting data of the character program from the multiplexed signal received by the receiving circuit;
A display element for displaying the character program based on the data extracted by the decoder circuit;
A circuit that detects when a specific character code, an operation position backward code, and a keyword character code are included in this order in the data extracted by the decoder circuit;
Have
When the output of the detecting circuit indicates that the data extracted by the decoder circuit includes a specific character code, an operation position backward code, and a keyword character code in this order, The character program of the data containing the code is displayed on the display element in preference to other general character programs.
Teletext broadcast receiver
It is what.
Therefore, if a predetermined character code, an operation position backward code, and a keyword character code are included in the data, the character program is displayed with priority over other general character programs.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
By the way, in the character broadcasting, the character code and the control code are arranged and transmitted in the data block as described above. FIG. 5 shows a part of the control code.
[0030]
One of the control codes is “motion position backward code APB (08h)”, and the control content of the backward code APB is “reverse the motion position along the motion direction by the length of the motion direction of the display section. To do. " That is, the backward code APB has a function of returning the character display position (cursor position) to the left by one character.
[0031]
For example, when displaying with the character code of “A” and the character code of “I”, it is displayed as “I”, but when the backward code APB is inserted after the character code of “A” When “A” is displayed, the next display position should be to the right of “A”. However, because the character is moved back by one character by the backward code APB, the position “A” is again displayed. Is displayed. That is, the character immediately before the backward code APB is overwritten with the character immediately after, and as a result, the character immediately before is not displayed.
[0032]
In addition, when transmitting the header text of a text program, the contents of the header text are fixed at that time, so the backward code APB is not bothered and the display content of the header text is not changed by overwriting. Therefore, the backward code APB is not used in normal header text.
[0033]
The present invention focuses on the function and usage pattern of such an operation position backward code APB and realizes priority display of character programs.
[0034]
That is, when transmitting a priority program, the broadcasting station includes “prefix character code”, “operation position backward code APB”, and “keyword” successively in this order in the header text of the program. . For example, the prefix character code is “:” (colon), and the keyword is “Sokuho” indicating “breaking news”.
[0035]
Therefore, for example, as shown in FIG.
Miel Radio_News_Sokuho_Channel
(_ Indicates a blank (character code 20h). The same applies hereinafter.) When a program that is a priority program is designated as a priority program, its header text is also shown in FIG.
Miel Radio_News_: Backward code APB Sokuhou_Channel
And
[0036]
Therefore, in the receiver, if the header sentence includes “prefix character code”, “operation position backward code APB”, and “keyword” in this order in succession, the program is regarded as a priority program. Deemed and displayed in preference to other general programs.
[0037]
The present invention realizes priority display of priority programs in accordance with the above-described concept.
[0038]
In FIG. 1, reference numeral 10 denotes an FM character multiplex broadcast receiving circuit, and an FM signal received by an antenna 11 is supplied to a PLL synthesizer type tuner circuit 12 to select a broadcasting station having a target frequency. At the same time, the FM signal is converted into an intermediate frequency signal, and this intermediate frequency signal is supplied to the FM demodulation circuit 14 through an intermediate frequency circuit 13 having an intermediate frequency filter and an amplifier.
[0039]
The demodulating circuit 14 extracts a frequency multiplexed signal of the audio signal (monaural signal or stereo composite signal) and the LMSK signal in the FM character multiplex broadcasting described above. The signal is supplied to the speaker 16 through the amplifier 15. The frequency multiplexed signal is supplied to the decoder circuit 18 and the character program data is decoded and error-corrected from the LMSK signal.
[0040]
Further, the FM receiver is provided with a microcomputer 20 for executing tuning of the tuner circuit 12 and display of character programs by FM character multiplex broadcasting.
[0041]
The microcomputer 20 includes a CPU 21 for executing a program, a ROM 22 for the program, a RAM 23 for a data area and a work area, and a RAM 24 for a buffer for receiving FM character multiplex broadcast data. The memories 22 to 24 are connected to the CPU 21 through the system bus 29.
[0042]
In this case, various programs are prepared in the ROM 22, and for example, a priority program display routine 100 and a keyword extraction routine 200 shown in FIGS. 2 and 3 are prepared. Details of these routines 100 and 200 will be described later.
[0043]
Further, ports 25 and 26 and an interface circuit 27 are connected to the bus 29. Then, data for channel selection is supplied from the CPU 21 to the tuner circuit 12 through the port 25, and the channel selection is executed. Further, the character program data decoded by the decoder circuit 18 is stored or stored in the reception buffer RAM 24 through the port 26.
[0044]
The interface circuit 27 is connected to a tuning key and various operation keys K1 to KN. These keys K1 to KN are constituted by non-lock type push switches.
[0045]
In addition, a font ROM (character generator) 31 for converting character data sent by FM character multiplex broadcasting into display data is connected to the bus 29, and a display controller 32 is also connected. The display memory 33 is connected to the controller 32, and an LCD 50, for example, is connected as a display element.
[0046]
In this case, the LCD 50 is a full dot matrix system that displays characters by a combination of dots. For example, as shown in FIG. 6A, the display area has a level 1 size, that is, a size of 15.5 characters × 2.5 lines. It is said. Of the display areas, the uppermost 0.5-line area is a header area, and the remaining two-line areas are main areas for displaying the text.
[0047]
Further, the memory 33 is a bitmap method corresponding to the dot matrix method of the LCD 50, and has a capacity for one screen. Then, the character code and control code stored in the reception buffer RAM 24 (or the character code prepared in advance in the ROM 22) are sequentially read out by the CPU 21, and when the read code is a character code, The character code is converted into display data using the font data of the ROM 31, and this display data is written into the memory 33 through the controller 32.
[0048]
At this time, the display data in the memory 33 is repeatedly read out by the controller 32, converted into a display signal, and supplied to the LCD 50. Therefore, characters according to the character code read out from the RAM 24 or the ROM 22 by the CPU 21 are displayed on the LCD 50.
[0049]
Further, when the code read from the RAM 24 is a control code, the contents of the memory 33 are changed according to the control code, and as a result, the display is made according to the control code.
[0050]
In addition, when a predetermined key operation is performed, a flag indicating a priority program display mode, that is, when a priority program is sent, it is displayed with priority over other general programs, or the priority program is displayed. Is set or reset so that the user can set permission / prohibition of priority display of priority programs in advance.
[0051]
In such a configuration, the process for selecting a channel and the process for selecting a character program are realized by a channel selection process and a character program selecting process similar to those of a general PLL synthesizer receiver.
[0052]
When the character broadcast is received, when data for one packet of the character program is output from the decoder circuit 18, the routine 100 starts from step 101, and then is output from the decoder circuit 18 at step 102. One packet of data is received in the buffer. Then, in step 103, it is determined whether or not the data received in step 102 is level 1 data. If it is level 1 data, it is character program data that can be displayed by this receiver. Proceed to 111.
[0053]
In step 111, it is determined whether or not the data received in step 102 is data of a packet already collected in the RAM 24. If the data is already collected packet data, the process proceeds from step 111 to step 112. move on. In step 112, it is determined whether or not the data received in step 102 is updated packet data from the previous reception. If the received packet data is updated, the process proceeds from step 112 to step 113. Proceed to
[0054]
In step 113, the old data corresponding to the data packet received in step 102, that is, the data of the packet before update, is deleted from the data stored in the RAM 24. Next, in step 114, step 102 The received data is stored in the RAM 24.
[0055]
In step 111, if the data received in step 102 is data of a packet that has not been collected in the RAM 24, the data is valid, so the process proceeds from step 111 to step 114, and is stored in the RAM 24 as described above. The
[0056]
Therefore, the data in the RAM 24 is updated in units of packets in steps 111 to 114.
[0057]
In step 121 subsequent to step 114, it is determined whether or not one page of data has been prepared in the RAM 24 for the page including the data received in step 102. The process advances from step 121 to step 122, where it is determined whether or not the data for one page is data of an emergency program. If the data is not emergency program data, the process proceeds from step 122 to step 123. In step 123, the priority program display mode is determined. If priority program priority display is permitted, the process proceeds to step 123. To step 131.
[0058]
Details of this step 131 will be described later. In this step 131, the routine 200 is executed, and the prefix character code and the operation position backward code are added to the header sentence of the data determined to have been prepared for one page by the step 121. When APBs are included in succession, for example, character codes for four characters following these are extracted as keywords.
[0059]
Then, in step 132, it is determined whether or not the keyword extracted in step 131 matches a preset keyword, for example, “Sokuhou”. If they match, the process proceeds from step 132 to step 133. In step 133, the character program is displayed on the LCD 50 using the data determined in step 121 as having been prepared for one page as described above. Therefore, at this time, the character program based on the data for one page is displayed with priority over other general character programs.
[0060]
Then, the processing in the routine 100 ends in the following step 141. At this time, since the program displayed in step 131 is displayed with priority over other general programs, the program is regarded as a priority program. The priority display was made.
[0061]
In step 103, when the data received in step 102 is not level 1, the data cannot be displayed by this receiver. Therefore, the process proceeds from step 103 to step 141, and this routine 100 is terminated. In step 112, when the data received in step 102 is not the data of the packet updated since the previous reception, the process proceeds from step 112 to step 141 because the subsequent processing for the data is unnecessary. 100 is finished.
[0062]
Furthermore, when one page of data is not ready in the RAM 24 in step 121, the page cannot be displayed yet, so the process proceeds from step 121 to step 141, and this routine 100 is terminated. In step 122, when the data for one page is emergency program data, it must be displayed with the highest priority, so the process proceeds from step 122 to step 133, and the emergency program is displayed. Furthermore, when priority display of the priority program is prohibited in step 123, the priority program is ignored, so the process proceeds from step 123 to step 141, and this routine 100 ends.
[0063]
In step 132, when the keyword extracted in step 131 does not match the keyword set in advance, the data at that time is not the data of the priority program, so the process proceeds from step 132 to step 141, and this routine 100 Exit.
[0064]
In this way, according to the routine 100, the prefix character code, the operation position backward code APB, and the keyword are successively included in this order in the header text of an arbitrary character program as shown in FIG. 4B, for example. In other words, the character program is regarded as a priority program, and is displayed with priority over other general programs.
[0065]
Next, the process of the routine 200 will be described. This routine 200 is executed in step 131, but in the routine 200, as a variable.
ch: Input buffer. The entered character.
lastchar: the previous character
kwflag: Mode flag. Set to “1” when importing keywords.
kwlength: Keyword length. If the keyword is “SOKUHO”, 4 characters.
kwbufr: Keyword buffer
Is used.
[0066]
In the routine 200, the processing starts from step 201. Next, in step 202, the variable lastchar is cleared and set, the mode flag kwflag is reset to “0”, and the keyword buffer kwbufr is cleared.
[0067]
Next, in step 211, it is determined whether or not the process has been executed up to the last character of the header sentence. In this case, since the process has not been executed yet to the last character, the process proceeds from step 211 to step 212. In step 212, one character of the header sentence is taken into the variable ch, and in step 213, the mode flag kwflag is determined.
[0068]
When the keyword has not yet been captured, the mode flag kwflag is “0”, so the process proceeds from step 213 to step 214. In step 214, the character (character code) captured in the variable ch by step 212 is the backward code. If it is determined whether it is APB and not the backward code APB, the process proceeds from step 214 to step 215. In step 215, the character captured in the variable ch in step 212 is transferred to the variable lastchar, and then the process returns to step 211.
[0069]
In this way, the characters (character codes) of the header sentence are sequentially checked one by one by the loop of steps 211 to 215.
[0070]
In this check, when the character fetched into the variable ch in step 212 is the backward code APB, the process proceeds from step 214 to step 221. In this step 221, it is determined whether or not the variable lastchar is a prefix character code. That is, it is determined whether or not the character code before the backward code APB is a prefix character code.
[0071]
If it is not a prefix character code, the process returns from step 221 to step 211, and the processes after step 211 are continued.
[0072]
However, when the variable lastchar is a prefix character code in step 221, the process proceeds from step 221 to step 222. In step 222, the mode flag kwflag is set to “1” and the variable kwlength is set to 0. Thereafter, the process returns to step 211. Therefore, step 222 is executed only when the prefix character code and the backward code APB are continued in the header sentence, and kwflag = “1” and kwlength = 0.
[0073]
Then, when kwflag = “1”, when steps 211 and 212 are executed next and step 213 is executed, the process proceeds from step 213 to step 231. In step 231, the character of the variable ch is added to the keyword buffer kwbufr. In step 232, the variable kwlength is incremented by 1. Next, in step 233, whether the variable kwlength has become the keyword length. Is determined and the variable kwlength is not the length of the keyword, in this case 4 characters, the process returns from step 233 to step 211.
[0074]
Therefore, if a header character is followed by a prefix character code and a backward code APB, the characters following the backward code APB are sequentially transferred to the keyword buffer kwbufr, and the number of characters is counted by the variable kwlength. .
[0075]
When the variable kwlength becomes the length of the keyword, that is, in this case, kwlength = 4, this is determined in step 233, and the process proceeds from step 233 to step 234. In step 234, the variable lastchar is “ Then, the process returns to step 211.
[0076]
Therefore, thereafter, Steps 211 to 215 are repeated, and when the above processing is executed up to the last character of the header sentence, the processing proceeds from Step 211 to Step 241, and this routine 200 is terminated.
[0077]
Therefore, according to this routine 200, when the prefix character code and the backward code APB follow in the header sentence, for example, 4 characters following the backward code APB are extracted as keywords into the keyword buffer kwbufr. Become.
[0078]
Further, even if the prefix character code and the backward code APB exist in the header sentence, when the two codes are not continuous, step 222 is not executed, so steps 231 to 234 are not executed, and therefore the keyword buffer kwbufr Will remain empty. Further, even when either one (or both) of the prefix character code and the backward code APB does not exist in the header sentence, since step 222 is not executed, steps 231 to 234 are also not executed and the keyword buffer is not executed. kwbufr will remain empty.
[0079]
When the routine 200 is executed in step 131, step 132 is subsequently executed. In step 132, whether the character string captured as a keyword in the keyword buffer kwbufr by the routine 200 actually matches the keyword. Whether or not is determined, and the subsequent processing is continued as described above according to the determination result.
[0080]
Therefore, if the prefix text, backward code APB, and keyword are consecutive in this order in the header text, the program containing the header text is regarded as a priority program and takes precedence over other general programs. Is displayed.
[0081]
As described above, according to the receiver of FIG. 1, if the prefix character code, the backward code APB, and the keyword are consecutive in this order in the header sentence, the program including the header sentence has priority. It is regarded as a program and displayed with priority. Therefore, as in general television broadcasting and radio broadcasting, typhoon information and extras can be displayed with priority (interrupted) over other general programs. At that time, the emergency program is not used.
[0082]
Moreover, even if the header sentence includes the prefix character code and the backward code APB, both codes are continuous. Therefore, as shown in FIGS. 4A and 4B, when the header sentence is displayed, the prefix character code is displayed. Since the character “:” is overwritten by the first character of the keyword, the character of the prefix character code is not displayed.
[0083]
That is, the header sentence is displayed without any change from the normal header sentence, regardless of whether the receiver is not applied to the present invention or applied to the receiver. Moreover, the display content of the header text and the text does not differ between the receiver to which the present invention is not applied and the receiver to which the invention is applied.
[0084]
Furthermore, since an arbitrary character string can be used as a keyword, there is no problem even if the keyword is displayed as a part of the header sentence. For example, if “Sokuhou” indicating “Breaking News” is used as a keyword, there is no problem even if this is displayed. Rather, a character string or title character that informs the user that priority display is used can be used as a keyword.
[0085]
Further, if there is only one of the prefix character code and the backward code APB before the keyword, even if the keyword is included in the header sentence, the character program is not preferentially displayed as the priority program. Further, the user can set permission / prohibition of display of the priority program.
[0086]
Also, for the broadcasting station, when creating the data of the priority program, the existing creation program can be used as it is, and no extra cost is incurred. Furthermore, each broadcast station can use a unique character string as a keyword. In addition, by setting a plurality of keywords, for example, only when a professional baseball game is finished, the game result can be preferentially displayed.
[0087]
【The invention's effect】
According to the present invention, typhoon information, extras, etc. can be preferentially displayed over other general programs as in general television broadcasting and radio broadcasting. At that time, the header sentence is displayed as if it is a receiver to which the present invention is not applied or a receiver to which the present invention is applied without any difference from a normal header sentence. Moreover, the display content of the header text and the text does not differ between the receiver to which the present invention is not applied and the receiver to which the invention is applied. Furthermore, there is no problem in displaying the header text and the text.
[Brief description of the drawings]
FIG. 1 is a system diagram showing an embodiment of the present invention.
FIG. 2 is a flowchart showing one embodiment of the present invention.
FIG. 3 is a flowchart showing one embodiment of the present invention.
FIG. 4 is a diagram for explaining the present invention.
FIG. 5 is a diagram for explaining the present invention.
FIG. 6 is a diagram for explaining the present invention.
FIG. 7 is a diagram for explaining the present invention.
FIG. 8 is a diagram for explaining the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... FM receiver circuit, 11 ... Antenna, 12 ... Tuner circuit, 13 ... Intermediate frequency circuit, 14 ... FM demodulator circuit, 15 ... Amplifier, 16 ... Speaker, 18 ... Decoder circuit, 20 ... Microcomputer, 21 ... CPU, 22 ... ROM (for program), 23 ... RAM (for work area), 24 ... RAM (for reception buffer), 25 ... output port, 26 ... input port, 27 ... interface circuit, 29 ... system bus, 31 ... ROM (character) Generator), 32 ... display controller, 33 ... memory (for display), 50 ... LCD, 100 ... priority program display routine, 200 ... keyword extraction routine, K1 to KN ... tuning keys and operation keys

Claims (5)

In a multiplex broadcasting method for multiplexing data of a plurality of character programs into a signal of an original audio broadcasting program and broadcasting the multiplexed signal,
Among the plurality of character programs, the character program data to be displayed with priority over other general character programs includes a specific character code, an operation position backward code, and a keyword character code in this order. Multi-broadcasting method for text programs. The multiplex broadcasting method according to claim 1,
A multiplex broadcasting method for a character program in which the specific character code, the operation position backward code, and the character code of the keyword are included in the header text data of the character program. In a receiver for receiving a text multiplex broadcast in which a plurality of text program data is multiplexed with the original audio broadcast program signal and the multiplexed signal is broadcast,
A receiving circuit for receiving the character multiplex broadcast;
A decoder circuit for extracting data of the character program from the multiplexed signal received by the receiving circuit;
A display element for displaying the character program based on the data extracted by the decoder circuit;
When the data extracted by the decoder circuit includes a specific character code, an operation position backward code, and a keyword character code in this order, a circuit for detecting this is included.
When the output of the detecting circuit indicates that the data extracted by the decoder circuit includes a specific character code, an operation position backward code, and a keyword character code in this order, A character multiplex broadcast receiver in which a character program of data including a code is displayed on the display element in preference to other general character programs. The receiver according to claim 3,
When the specific character code, the movement position backward code, and the character code of the keyword are included in the header text data of the character program in this order, the characters of the data including these codes A character multiplex broadcast receiver in which a program is displayed on the display element in preference to other general character programs. The receiver according to claim 3 or claim 4,
A multiplex broadcast receiver having means for prohibiting / permitting the preferential display operation.

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