JP2883004B2 - Teletext multiplex broadcasting receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a text multiplex broadcast receiver, and more particularly to a text multiplex broadcast receiver for scrolling text information received from a text multiplex broadcast station.

[0002]

2. Description of the Related Art In Europe, various data are multiplexed and transmitted on FM radio broadcasting, and the same program is broadcast when the receiving condition of the currently receiving broadcast deteriorates on the side of an on-vehicle FM radio receiver. 2. Description of the Related Art A radio data system (RDS) has been put to practical use so that it can automatically switch to another station or automatically start switching to a traffic information broadcasting station when a certain station starts broadcasting traffic information. . This RDS
Transmits character information (radio text) for a maximum of 64 characters or 32 characters using two formats called a type 2A group and a type 2B group,
Characters can be displayed on an RDS-compatible FM radio receiver. For example, while a certain song is being broadcast, information that introduces the song, such as a song title and an artist name, can be viewed. However, the character information is usually scroll-displayed due to restrictions on the character display space of the receiver.

FIG. 9 shows a format of a type 2A group and a type 2B group. Type 2A group is 3
In the 4th and 4th blocks, send 2 characters, 4 characters each. In the second block, an address indicating a group type code (4 bits), an A / B identification flag (1 bit) indicating whether the version is A or B, and several character numbers (character positions in character information) Send the code (4 bits). When the 4-bit address code indicates n in decimal, the character number of the first character in the third block is 4n +
The second character number is 4n + 2, the character number of the first character in the second block is 4n + 3, and the second character number is 4n + 4. Therefore, character information of 64 characters from character numbers 1 to 64 at maximum can be transmitted in 16 types of formats. The type 2B group sends two characters in the fourth block. Therefore, character information of a maximum of 32 characters from character numbers 1 to 32 can be transmitted in 16 types of formats.

FIG. 10 shows a conventional R having a scroll display function.
2 shows a part of a DS-compatible FM radio receiver. The RDS data demodulation circuit 1 receives the FM detection signal, demodulates the RDS data, and outputs the demodulated RDS data to a system controller 2 having a microcomputer configuration. The system controller 2 is an RDS data demodulation circuit 1
When the format of the RDS data input from the RDS is identified as a radio text by the radio text identification unit 11 described later, the character input processing unit 3 determines the character information in the RDS data in the same manner as previously received in units of one character. Then, it is determined whether or not the character number matches the character of the character number. The reception buffer memory unit 4 is cleared immediately after the power is turned on or when the reception of character information is interrupted, and thereafter, the character input processing unit 3 stores the characters. The character information reception start detection unit 5 checks whether or not the reception of character information has started based on the presence or absence of the character at the address 1 in the reception buffer memory unit 4. The character is stored at the first address of the reception buffer memory unit 4. Therefore, when it is detected that the reception of the character information has started, the display control unit 6 transfers the contents of the reception buffer memory unit 4 to the display buffer memory unit 7. Then, the first timer section 8 is repeatedly clocked for 500 ms. Each time the first timer section 8 finishes measuring the time of 500 ms, the scroll counter section 9 counts up. Based on the count value of the scroll counter section 9, the display control section 6 stores the data in the display buffer memory section 7. In the character information, a partial range of the character information is scroll-displayed on the 8-digit display 10 so that the character of the character number indicated by the count value of the scroll counter unit 9 comes to the first digit. When the scroll display is completed up to the last character stored in the display buffer memory unit 7, the contents of the reception buffer memory unit 4 are transferred to the display buffer memory unit 7 again. Scroll display is performed based on the stored information.

On the other hand, the radio text identification unit 11
Each time RDS data is input from the data demodulation circuit 1, R
By checking whether the group type code of the format of the DS data is 2 and the A / B identification flag is A or B, it is determined whether or not the data is radio text format data (see FIG. 9). The second timer unit 12 starts measuring the time of 10 seconds each time it is determined that When the broadcast station transmits character information, the format data of the type 2A group or type 2B group is transmitted in a short cycle, so that the second timer unit 12 does not complete the time measurement of 10 seconds. If the reception state has deteriorated or the broadcast station has stopped transmitting the text information, and the radio text identification unit 11 has not recognized the input of the format data of the radio text for 10 seconds, the second timer unit 12 starts to operate. A time-up signal as a character information reception off detection signal is output to the reception buffer memory unit 4 and the display control unit 6, and when the time-up signal is input, the reception buffer memory unit 4
Is cleared, the display control unit 6 clears the display buffer memory unit 7 and causes the display 10 to display a message indicating that there is no character information.

[0006]

However, in the above-mentioned prior art, the character information receiving start detecting unit 5 clears the character information receiving unit 5 immediately after the power is turned on or after the receiving buffer memory unit 4 is cleared due to the interruption of the receiving of the character information. Since the reception start is detected, when the character information stored in the reception buffer memory unit 4 is transferred to the display buffer memory unit 7, all the character information may not yet be stored in the reception buffer memory unit 4, At this time, in the first scroll display, as shown in FIG. 11, characters may be partially missing, and the meaning may not be understood or the set may be misunderstood. In addition, because the reception condition has deteriorated or the broadcast station has stopped transmitting text information,
When the timer unit 12 outputs a detection signal indicating that character information reception has been turned off, even if a portion of the character information for which scroll display has not been completed remains (see A in FIG. 12A), the character information is mechanically processed. Is changed to a message display indicating that there is no (see (2) in FIG. 12), so that the tail may be cut off and the contents of the last part may not be understood.

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, an object of the present invention is to provide a text multiplex broadcasting receiver capable of scrolling and displaying text information without omission.

[0008]

According to one aspect of the present invention, character information extracting means for extracting character information superimposed on a received signal, receiving temporary storage means for temporarily storing the extracted character information, Character information reception start detection means for detecting the start of information reception; display temporary storage means for temporarily storing display character information; display means for displaying a predetermined number of character information; and start of character information reception. When detected, the character information stored in the temporary storage for reception is transferred to the temporary storage for display, and based on the character information stored in the temporary storage for display, the character is shifted by one character in time T based on the character information. And a display control means for scrolling the information on the display means. In the text multiplex broadcast receiver, after the start of the reception of the text information is detected, the display control means temporarily stores the data for reception at a time interval of T or less. It is characterized by repeatedly transferring the character information stored in the stage temporary storage means for display.

In another aspect of the present invention, character information extracting means for extracting character information superimposed on a received signal, display temporary storage means for temporarily storing the extracted character information for display, Character information reception off detecting means for detecting reception off, display means for displaying character information of a predetermined number of characters, and scrolling display of the character information on the display means based on the character information stored in the display temporary storage means. A display control unit, wherein the display control unit displays a message indicating that there is no character information on the display unit when the reception off of the character information is detected. Is stored in the display temporary storage means until the scroll display of all the character information stored in the display temporary storage means is completed even after the reception OFF of the character information is detected. Save the character information, to continue the scroll display, it is characterized in that on the display unit a message indicating that after the character information to the end scroll display is completed character information does not exist.

[0010]

According to one aspect of the present invention, after the start of reception of character information is detected, the character information is stored in the reception temporary storage means at a time interval equal to or shorter than the movement time interval T for one character in scroll display. The character information is transferred to the display temporary storage means repeatedly, so that the next new character is prepared in the display temporary storage means before the timing when the next new character is to be displayed on the display means. The character information without omission can be displayed immediately after the start of the reception of the character information. Therefore, the meaning is not understood or the set is not mistaken for a failure.

According to another aspect of the present invention, the scroll display of all the character information stored in the display temporary storage means is completed even after the reception off of the character information is detected.
The character information stored in the display temporary storage means is saved, the scroll display is continued, and after the scroll display is completed, a message indicating that there is no character information is displayed on the display means. Even after the reception is turned off, the character information can be displayed to the end without the end being cut off, and the character information can be reliably transmitted to the user.

[0012]

FIG. 1 is a partially omitted circuit diagram of an RDS-compatible FM radio receiver according to an embodiment of the present invention. In addition,
The same components as those in FIG. 10 are denoted by the same reference numerals.
21 is an antenna, 22 is a front end that extracts a reception signal of a desired broadcast station from an antenna reception signal, converts the signal into an intermediate frequency signal, and outputs it. Reference numeral 24 denotes an F that inputs an intermediate frequency signal from the intermediate frequency amplifier circuit 23 and performs FM detection.
M detection circuit, 25 is an MPX for extracting a stereo audio signal from the FM detection signal, 1 is an RDS data demodulation circuit for demodulating FM multiplexed RDS data from the FM detection signal and extracting radio text format data and the like, and 2A is an RDS data demodulation circuit.
RDS data is input from the DS data demodulation circuit 1, and a system controller of a microcomputer configuration is responsible for scroll display control, tuning control, etc. of character information, 10 is a display capable of displaying 8 digits of characters, 26 is a manual tuning operation, preset This is an operation panel for performing channel selection operation and the like.

The system controller 2A has substantially the same configuration as the system controller 2 shown in FIG. The reception buffer memory unit 4 has a storage area for 64 characters from addresses 1 to 64, and the display buffer memory unit 7 has a storage area for 64 + 8 characters from addresses 1 to 72. The display control unit 6A detects when the character information reception start detection unit 5 has detected that the reception of character information has been started because the character is stored in the first address of the reception buffer memory unit 4, and when the first timer unit 8 is constant time T = 500m
Every time the time measurement of s is completed, the character information is transferred from the reception buffer memory unit 4 to the display buffer memory unit 7, and the character information stored in the display buffer memory unit 7 is updated with the latest state of the reception buffer memory unit 4. Match. This allows
Character missing is prevented from occurring in the scroll display immediately after the start of the reception of the character information.

The display control unit 6A determines that the character information does not exist immediately when the time-up signal is input from the second timer unit 12 because the reception information is deteriorated or the broadcast station stops transmitting the character information. Is displayed on the display 10 instead of displaying a message indicating that there is no character information after the character information has been scrolled to the end. Reference numeral 27 denotes a tuning control unit which performs tuning control on the front end 22 in accordance with a manual tuning operation or a preset tuning operation on the operation panel 26 to tune to a desired station of the user. The other components of the system controller 2A are configured exactly the same as in FIG.

Next, the operation of this embodiment will be described with reference to FIGS. 2 to 4 show the system controller 2A.
Flowchart showing scroll display processing by FIG.
8 are explanatory diagrams of the scroll display operation. When the power of the set is turned on, the system controller 2A performs a predetermined initial setting process, and the tuning control unit 27 performs tuning control on the front end 22, and tunes to the broadcast station that was received immediately before the power was last turned off. Further, the reception buffer memory unit 4 and the display buffer memory unit 7 are cleared. The display controller 6A causes the display 10 to display a message "NO RT" indicating that no character information is present (see step 50 in FIG. 2 and FIG. 5A). here,
If it is tuned to the RDS station, the RDS data demodulation circuit 1 demodulates the RDS data from the FM detection signal output from the FM detection circuit 24, and the system controller 2A
Output to

Each time the RDS data is input from the RDS data demodulation circuit 1, the system controller 2A executes the interrupt processing shown in FIG. 4, and the radio text identification unit 11 first checks the group type code and the A / B identification flag. By doing so, it is determined whether the format data input this time is of the type 2A group or type 2B group related to radio text (step 80), and YES
At this time, the second timer section 12 is set to start measuring time for 10 seconds (step 81). Subsequently, the character input processing unit 3 determines whether or not each character included in the format data relating to the radio text input this time matches a character of the same character number previously received in units of one character. Then, it is temporarily stored in the address corresponding to the character number in the reception buffer memory unit 4 (step 82). The current receiving station is transmitting a text consisting of 26 characters (hereinafter described by replacing the 26 characters of the text with alphabetic characters a to z), the first time is correctly received from w, and the second and subsequent times are correctly received. Then, characters are stored in the receiving buffer memory unit 4 in the order of w, x, y, z, a, b,... (See FIGS. 5 (2) to (4)).

When "a" is stored at the start address of the reception buffer memory 4, the character information reception start detection unit 5 outputs a character information reception start detection signal to the display control unit 6A. When the display control unit 6A receives the character information reception start detection signal,
The count value i of the scroll counter 9 is cleared to 0 (steps 51 and 52). Then, the character information stored in the addresses 1 to 64 of the receiving buffer memory unit 4 is transferred to the addresses 1 to 64 of the display buffer memory unit 7; The value obtained by adding 8 to the number (here, 26) is the final number TXT
(M), and the symbol code of "-" is stored at addresses (here, addresses 27 to 34) from one to eight after the last character in the display buffer memory unit 7 (step 53). 55, and FIG. 5 (3)).

Subsequently, the display control section 6A operates the address (i +) of the character information stored in the display buffer memory section 7.
Eight characters in the range from address (i + 1-8) to address (i + 1) are displayed on the display 10 so that the character 1) is the first digit of the display 10 (step 56). In addition,
Since the address does not precede 1, address 0 is address {TXT (M)} and address (-1) is address {TX
T (M) -1} is processed before address 1 following address {TXT (M)}, and similarly after address {TXT (M)} is processed following address 1. “−−−−−−−− a” is displayed on the display 10 (see FIG. 5 (3)). Thereafter, the first timer section 8 is set to start measuring time of 500 ms (step 57). Then, it repeatedly checks whether the first timer unit 8 has timed out and the second timer unit 12 has timed out (steps 60 and 61 in FIG. 3). During this time, the characters subsequent to b are also stored in the reception buffer memory unit 4 (FIG. 5).
(4)).

When the normal reception of the radio text continues, the second timer unit 12 is repeatedly set at short time intervals, so that the first timer unit 9 times out first. At this time, the count value i of the scroll counter unit 9 becomes 1 (steps 60 and 62). The display control unit 6A that has received the time-up signal from the first timer unit 9 checks whether i = TXT (M) = 34 (step 6).
3) If NO, return to step 53, and transfer the character information from the receiving buffer memory unit 4 to the display buffer memory unit 7 again. At this time, the last character in the transferred character information A value obtained by adding 8 to the number (here, 26) is registered as the final number TXT (M), and the address from one to eight after the last character in the display buffer memory unit 7 (here, addresses 27 to 34). ) Is stored with the symbol code "-" (steps 53 to 55).

Subsequently, the display control unit 6A operates the address (i +) of the character information stored in the display buffer memory unit 7.
Eight characters in the range from address (i + 1-8) to address (i + 1) are displayed on the display 10 so that the character 1) is the first digit of the display 10 (step 56). When the data is transferred from the reception buffer memory unit 4 to the display buffer memory unit 7, “−−−−−−− ab” is displayed on the display 10 because the second character b is already included (FIG. 6).
(See (1)). Then, the first timer section 8 is set again to start measuring time of 500 ms (step 57). First
When the timer section 8 has timed out, i = 2, and i = 34 has not yet been reached, so the flow returns to step 53 again to repeat the same processing (steps 60 and 6 in FIG.
2, 63).

When the normal reception state continues, the reception buffer memory unit 4 is much faster than the scroll speed.
Since character information is additionally stored in the character information, character information without scrolling is displayed immediately after the start of character information reception, as shown in FIGS. 5 (3), (4), 6 (1), and (2). become. Therefore, the meaning is not understood or the set is not mistaken for a failure. Thereafter, when the character z is displayed in the eighth digit of the display 10 (see FIG. 6 (3)),
The next display is "---" (see FIG. 6 (4)), indicating that the display of a series of character information has been completed for one time. After this, when the first timer section 8 times out,
Since the count value i of the scroll counter unit 9 is 34, the display control unit 6A determines YES in step 63,
At this time, after the scroll counter section 9 is cleared and i = 0 (step 64), the process proceeds to step 53. Therefore, the scroll display starts again from the beginning of the character information as shown in FIGS. 5 (3), (4) and 6 (1).

As described above, while the scroll display is being performed, if the reception state deteriorates or the receiving station stops transmitting the radio text, the radio text reception identifying unit 11
Determines NO in step 80, and does not set the timer of the second timer unit 12. When the receiving state is restored within 10 seconds or when the receiving station resumes the transmission of the radio text, the second timer unit 12 is set again at a short time interval, so that the scroll display operation does not change. (No in step 61), when the receiving state deteriorates or when 10 seconds elapse while the receiving station stops transmitting the radio text, the second timer unit 12 outputs a time-up signal as a character information reception off detection signal. The data is output to the reception buffer memory unit 4 and the display control unit 6A. The receiving buffer memory unit 4 which has received the time-up signal clears the stored data (steps 61 and 65).

On the other hand, the display control unit 6A which has received the time-up signal from the second timer unit 12 does not immediately display a message indicating that character information does not exist, but displays one scroll display currently in progress. Continue scroll display control until completed. That is, first, it waits for the first timer unit 8 to time up (step 66), and when the first timer unit 8 times up and i is incremented, it is checked whether i = 34 (step 67,
68) If not, the address (i + 1-8) is set so that the character at the address (i + 1) becomes the first digit of the display 10 in the character information stored in the display buffer memory unit 7.
Eight characters in the range of ~ (address + 1) are displayed on the display 10 (step 69). Then, the first timer unit 8
Is set (step 70). When the first timer unit 8 times out and i is incremented, it is checked again whether i = 34 (steps 67 and 68). 7, the character at the address (i + 1) is one of the
Eight characters in the range from address (i + 1-8) to address (i + 1) are displayed on the display 10 so as to be the digit (step 69). Then, after setting the first timer section 8 (step 70), the process returns to step 66.

As a result, for example, when the receiving state deteriorates in the state of FIG. 7A or when the receiving station stops transmitting the character information, 10 seconds elapse and the second timer unit 12 times out. 7 (2), the scroll display is in progress, but the scroll display can be continued until the scroll display of the last character is completed (FIGS. 7 (3), (4), FIG. 8 (1), (2)).
Therefore, the scroll display does not run out in the middle and the character information can be displayed to the end, and the character information can be reliably transmitted to the user. Then i =
When the display becomes 34, the scroll display has been completed, and the display control unit 6A clears the display buffer memory unit 7 and then displays "NO R" indicating that there is no character information.
T ”is displayed (steps 71, 72,
After that, the process returns to step 51. As a result, the user can wait for the next reception without misunderstanding that the character display function has failed.

In step 51, the display controller 6A waits for input of a character information reception start detection signal. After that, when the receiving condition is restored or the receiving station resumes transmitting character information,
Characters are stored again in the reception buffer memory unit 4. When a character is stored at the head address of the reception buffer memory unit 4, the character information reception start detection unit 5 outputs a character information reception start detection signal.
The scroll display of the character information is performed by the same operation as described above.
Also at this time, every time the first timer unit 8 times out,
Since the character information is transferred from the reception buffer memory unit 4 to the display buffer memory unit 7, there is no missing in the scroll display characters immediately after the scroll display is restarted. Therefore, the meaning is not understood or the set is not mistaken for a failure.

In the above-described embodiment, in steps 54 and 55 of FIG. 2, a value obtained by adding 8 to the character number of the last character in the character information transferred this time is registered as the final number TXT (M). Also, the symbol code of "-" is stored in the addresses from one to eight after the last character of the display buffer memory unit 7, and "-" is used during the transition from the end to the beginning of the character information. So that the symbol
Although the break of the scroll display for the times is understood, the character number of the last character in the character information transferred this time is simply registered as the final number TXT (M), and the display buffer memory unit 7 particularly stores “−”. , Etc. may not be stored. In addition, although scrolling is performed in units of one character, in the case of a dot matrix type display, scrolling may be performed in units of half a character, a quarter character, or the like. Interval
With 250ms and 125ms, the speed is the same as scrolling one character at a time every 500ms. The scrolling time interval per character is 500ms, 400ms,
Other times such as 600ms may be used. The transfer time interval from the reception buffer memory unit 4 to the display buffer memory unit 7 is the same as the scroll movement time interval per character, but may be shorter than T. In addition, RDS compatible FM
Although the radio receiver has been described as an example, the present invention is not limited to this, and VICS (Road Traffic Information System)
The present invention can be similarly applied to various receivers that receive text multiplex broadcasting, such as a compatible FM radio receiver.

[0027]

According to one aspect of the present invention, after the start of reception of character information is detected, the temporary storage means for reception is set at a time interval equal to or shorter than the movement time interval T for one character in scroll display. The character information stored in the temporary storage for display is repeatedly transferred to the temporary storage for display, so that the next new character is displayed on the temporary storage for display before the timing at which the next new character should be displayed on the display. And character information without omission can be displayed immediately after the start of the reception of the character information. Therefore, the meaning is not understood or the set is not mistaken for a failure.

According to another aspect of the present invention, the scroll display of all the character information stored in the display temporary storage means is completed even after the reception off of the character information is detected.
The character information stored in the display temporary storage means is saved, the scroll display is continued, and after the scroll display is completed, a message indicating that there is no character information is displayed on the display means. Even after the reception is turned off, the character information can be displayed to the end without the end being cut off, and the character information can be reliably transmitted to the user.

[Brief description of the drawings]

FIG. 1 is a partially omitted circuit diagram of an RDS-compatible FM radio receiver according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating scroll display processing of a system controller.

FIG. 3 is a flowchart illustrating scroll display processing of a system controller.

FIG. 4 is a flowchart showing scroll display processing of a system controller.

FIG. 5 is an explanatory diagram of a scroll display operation.

FIG. 6 is an explanatory diagram of a scroll display operation.

FIG. 7 is an explanatory diagram of a scroll display operation.

FIG. 8 is an explanatory diagram of a scroll display operation.

FIG. 9 is an explanatory diagram of a data format of radio text in RDS.

FIG. 10 is a circuit diagram of a system controller of a conventional RDS-compatible FM radio receiver.

FIG. 11 is an explanatory diagram of a problem in a conventional scroll display.

FIG. 12 is an explanatory diagram of a problem in a conventional scroll display.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 RDS data demodulation circuit 2 A system controller 3 character input processing unit 4 reception buffer memory unit 5 character information reception start detection unit 6 A display control unit 7 display buffer memory unit 8 first timer unit 9 scroll counter unit 10 display 11 radio text identification Part 12 Second timer part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04B 1/06 H04B 7/00 G09G 5/34 H04H 1/00

Claims (2)

(57) [Claims] 1. A character information extracting means for extracting character information superimposed on a received signal, a receiving temporary storage means for temporarily storing the extracted character information, and a character information receiving start for detecting a start of receiving the character information. Detecting means, display temporary storage means for temporarily storing display character information, display means for displaying a predetermined number of character information, and reception temporary storage means when reception start of character information is detected. Display control means for transferring the stored character information to the display temporary storage means and for scrolling the character information on the display means so as to be shifted by one character in time T based on the character information stored in the display temporary storage means And a display control unit for displaying the character information stored in the reception temporary storage unit at a time interval of T or less after the start of the reception of the character information is detected. Teletext receiver repeatedly it has to forward, and wherein when the storage unit. 2. A character information extracting means for extracting character information superimposed on a received signal, a display temporary storage means for temporarily storing the extracted character information for display, and a character for detecting the reception OFF of the character information. Information receiving off detecting means, display means for displaying character information of a predetermined number of characters, and display control means for scrolling the character information on the display means based on the character information stored in the display temporary storage means. A display control means for displaying a message indicating that there is no character information on the display means when the reception of the character information is detected to be off, wherein the display control means comprises: Even after the OFF is detected, the character information stored in the display temporary storage unit is stored until the scroll display of all the character information stored in the display temporary storage unit is completed. Scroll display is continued, it has to be displayed on the display unit a message indicating that after the character information scrolled to the last character information is completed does not exist, teletext receiver characterized by.