JPH08331074A - Receiver - Google Patents

Abstract

PURPOSE: To allow the user to view program information (major supplement program) immediately with a simple operation when the user is going to view the information in the receiver receiving an FM teletext broadcast and to allow the user to view a program having been viewed before the program information immediately. with a simple operation when the user is going to view the program having been viewed before the program information. CONSTITUTION: A program information key 62C is provided as one of operation keys. When a program not being program information is displayed on a display screen 51 and the program information key 62C is depressed, a CPU 21 of a control section reads teletext data as to the program information from a memory and the program information is displayed on the display screen 50. When a program information key 62C is depressed while the program information is displayed on the display screen 50, the program having been displayed on the display screen 50 just before the program information is displayed is displayed on the display screen 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver for receiving character multiplex broadcasting such as FM character multiplex broadcasting.

[0002]

2. Description of the Related Art In FM broadcasting, multiplexing and transmission of character information and the like as digital data together with an original audio broadcasting program has been realized as FM character multiplex broadcasting, and when the broadcasting is received, FM receivers capable of displaying character information on a display element such as a liquid crystal display element have been commercially available.

This FM character multiplex broadcasting is based on the DARC system that enables mobile reception. The standard for multiplexing digital data such as character information is that the subcarrier frequency is 76 kHz, the transmission rate is 16 kilobits / second, and the modulation method is The LMSK and error correction method is a product code based on the (272,190) shortened difference set cyclic code.

Program services such as character information are classified into Levels 1, 2, and 3. All of them present (display) character information by dot display, but Level 1 is a service for receivers that can display 15.5 characters × 2.5 lines including the header part. , The information is in letters. Level 2 includes the header part, 15.5 characters x 8.5
It is a service for receivers that can display lines, and information is characters and graphics. Level 3 is a traffic information service for a receiver that can display a detailed map on a CD-ROM or the like, that is, a navigation system.

As the level 1 program service, news, weather forecast, traffic information, entertainment and main complementary programs are considered. Entertainment provides fortune-telling, listener message boards, quizzes, town information, etc.The main complementary programs are, for example, when the original audio broadcast program is a music program, its song title, performer name, and request time. It provides the program complement information such as the telephone number and the fax number. The main complementary programs are
It is also called program information or program interlocking.

[0006] In addition to the above, "urgent information" which is provided as needed when there is an urgent need is considered as a program service other than the above.

FIG. 4 shows a frame structure of an LMSK signal multiplexed in the above FM character multiplex broadcasting. LM
One frame of the SK signal is composed of 272 blocks,
Each block has 288 bits.

The 272 blocks constituting one frame are divided into 190 data packet blocks and 82 vertical parity packet blocks, and the vertical parity packet blocks are distributed. Sent out.

A 16-bit BI is placed at the beginning of each block.
C (block identification code) is added. However, BIC
, Four types are used, and each parity packet is distinguished by this, and the head of the frame is identified.

A block of data packets comprises a BIC followed by a 176-bit data packet, followed by a 14-bit CRC code, followed by 82 bits.
It is assumed to have a horizontal parity check code of bits. The CRC code is added to detect a residual error after error correction by the product code. A block of vertical parity packets is assumed to have a vertical parity packet of 272 bits following the BIC.

Each data packet is, as shown in FIG.
It consists of a 32-bit prefix and a 144-bit data block following it.

As shown in FIG. 6, the prefix is composed of service identification code, decoding identification flag, information end flag, update flag, program number, page number, data link code, and data packet number.

The service identification code is 4 bits and identifies the content of the program. For Level 1,
"1" is general information for sequential reception processing, "2" is general information for recording reception processing, and "4" is traffic information.

The sequential reception process is a mode in which the decoding process of the presentation is started as soon as the first data packet of the program data or page data arrives at the receiver, and the recording and reception process is the program data or page data. In this mode, all the data is received and recorded, the error correction process is performed by the CRC code for each data group, and then the presented decoding process is started.

When a program is required to be presented on the receiving side at the transmitting side, or a program which cannot be presented if the decoding process is started after the final packet of the data group is obtained, the sequential receiving process is performed. It is said that

The decoding identification flag is 1 bit and is set to "1" when the error correction circuit of the receiver outputs data by decoding only in the horizontal direction, and outputs the data after composite in the horizontal and vertical directions. In this case, it is set to "0".

In the successive reception process, the decoding identification flag is "0".
In this case, the receiver performs the decoding process for presentation of each data packet at the time of the first BIC of the data packet 302 packets after the reception of the first BIC of each data packet. Is prescribed as follows.

The information end flag is 1 bit and is set to "1" when the data group to be transmitted with a certain data group number is completed, and is set to "0" otherwise.

The update flag is 2 bits and is incremented by 1 each time the data group is updated.

The program number is 8 bits and the page number is 6 bits, and both form a data group number.

The data link code is 2 bits, and the data that should belong to one data group is a maximum of 4 because the number of packets exceeds the maximum value of the data packet number. It is a code for linking in the order of 0 → 1 → 2 → 3 between data groups when divided into data groups and transmitted by the same data group number with different data link codes.

The data packet number excluding the data link code is 8 bits and is assigned in order from "0".

The program numbers are from 0 to 255, "total contents" are assigned to "0", "254" is assigned to the main complementary programs (program information or program linkage), and "255" is assigned to the emergency information. Is assigned to each.

The page numbers are from 1 to 62, that is, one program has a maximum of 62 pages. One page corresponds to one data group, and one data group
It is composed of one or more data blocks.

In Level 1, one page is generally in the display format of 15.5 characters × 2.5 lines, but it may be in the display format of 15.5 characters × 8.5 lines. . In addition, the character data in this case specifies the character to be displayed by the JIS code.

As described above and as shown in FIG. 7, the receiver corresponding to the level 1 is a display capable of displaying 15.5 characters × 2.5 lines as an LCD (liquid crystal display element) 1, for example. A screen having a screen 1a is used. However, in the lower left side of the display screen 1a, a portion 1b of 15 characters × 2 lines
Is the text display area, and the upper 0.5 line and the 0.5-character portion 1c on the right side with hatching are the header text display area.

The receiver receives the LMSK signal together with the stereo composite signal, decodes the character data from the LMSK signal, and writes the decoded character data in the buffer memory.

The receiver or the remote control transmitter for remotely controlling the receiver is provided with a "general table of contents" key. By operating this key, the receiver can be operated as shown in FIG. 8 (A).
A general table of contents (main menu) is presented on the display screen 1a. However, in FIG. 8A, the total table of contents is displayed over multiple pages or in a display format of 8.5 lines, of which the first page or the beginning of the body of a page in the display format of 8.5 lines is displayed. The two lines are displayed.

The receiver or remote control transmitter is further provided with a "page (screen) advance" key, and by operating this key, as shown in FIG.
The next one page or the next two lines of the body of the page in the display format of 8.5 lines is displayed on a.

Then, when the user selects and decides the number of the item to be viewed from the total contents, the item or, as the case may be, the contents of the selected item is presented. For example, when the user selects "3. Weather forecast" from the total table of contents, a table of contents such as "1. Today's weather 2. Tomorrow's weather" is presented as shown in FIG.

Further, when the user selects and determines the number of the item to be viewed from the table of contents, the first page of the selected and determined item is presented. For example, when the user selects “1. Today's weather” from the above table of contents, as shown in FIG. 10, specific character information on “Today's weather” is presented.

[0032]

As described above, in the FM text multiplex broadcasting, program information (mainly complementary program) is considered as one of the program services for character information. Specifically, at a broadcasting station currently performing FM character multiplex broadcasting, as program services, "1. program information", "2. news &sports","3. weather forecast", "4. traffic information"
It identifies five of "5. Entertainment."

As described above, in the receiver for receiving the FM text multiplex broadcast, the user operates the general table of contents key to present the general table of contents on the display screen, and among the presented total table of contents, The program to be watched is presented on the display screen by selecting and determining the desired item from.

Further, when a certain program is presented,
For example, when a weather forecast page is being presented, when trying to watch another program, for example, when listening to a music program as the original audio broadcast program and trying to see program information linked to it, once After operating the table-of-contents key to present the total table of contents, another desired program is presented.

However, as described above, the program information is, for example, when the original audio broadcast program is a music program, its song title, performer's name, and telephone number at the time of request.
It provides program complement information such as FAX numbers and is linked with the original audio broadcast program. Therefore, when the user listens to the original audio broadcast program and tries to see the program information linked to it. , It is desirable to be able to see this immediately, as in the past,
It is cumbersome and inconvenient that the program information can be viewed only after the total table of contents key is operated to present the total table of contents.

Therefore, according to the present invention, in a receiver for receiving character multiplex broadcasting such as FM text multiplex broadcasting, when a user wants to view program information (main complementary program),
It allows you to watch it immediately with a simple operation, and even if you try to watch the program you were watching before watching the program information, you can immediately watch this with a simple operation. .

[0037]

According to the present invention, as a receiver, a receiving circuit for receiving character multiplex broadcasting, a memory for storing character data received by the receiving circuit, and a character according to the character data are displayed. A display element, a program information key for displaying character information of a main complementary program on the screen of the display element, and a control unit are provided, and the control unit is
When character information of a program that is not the main complementary program is displayed on the screen of the display element, when the program information key is operated, character data of the main complementary program is read from the memory, When the character information of the main complementary program is displayed on the screen of the display element and the character information of the main complementary program is displayed on the screen of the display element, when the program information key is operated. The character information of the program displayed on the screen of the display element immediately before the character information of the main complementary program is displayed is displayed on the screen of the display element.

[0038]

In the receiver of the present invention configured as described above, when the character information of the program which is not the main complementary program is displayed on the screen of the display element, the program provided especially in the present invention When the information key is operated, the main complementary program is directly called, and the character information of the main complementary program is displayed on the screen of the display element.

Further, when the same program information key is operated while the character information of the main complementary program is displayed on the screen of the display element, it is called immediately before the main complementary program is called. The program is directly called, and the screen of the display element returns to the state immediately before the character information of the main complementary program is displayed.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a receiver of the present invention, which is a level 1 compatible vehicle-mounted FM receiving FM character multiplex broadcast.
This is the case for the receiver.

In the FM receiver of this example, the FM signal received by the antenna 11 is supplied to the tuner circuit 12 of the synthesizer system to select the broadcasting station of the target frequency, and the FM signal is intermediate. The signal is converted into a frequency signal, and the intermediate frequency signal is supplied to the FM demodulation circuit 14 through the intermediate frequency amplifier circuit 13.

From the FM demodulation circuit 14, the sum signal (L + R) of the stereo left and right audio signals L and R, the DSB signal balanced-modulated by the difference signal (LR), the pilot signal, and the FM character The above LM in multiplex broadcasting
The frequency multiplexed signal with the SK signal is extracted.

The frequency-multiplexed signal is supplied to the stereo demodulation circuit 15, the left and right channel audio signals L and R are demodulated from the sum signal (L + R) and the DSB signal, and these audio signals L and R are amplified by the amplifier circuits 16L and 16. It is supplied to the left and right channel speakers 17L and 17R through 16R.

Further, the FM receiver is provided with a microcomputer 20 for performing channel selection in the tuner circuit 12 and character display by FM character multiplex broadcasting.

The microcomputer 20 has a CPU 21 for executing a program, a ROM 22, a work area RAM 23, and a RAM 24 for a reception buffer of FM character multiplex broadcasting data. In this case, RO
Various routines are written in M22, and
As a part of the routine, a program information routine 100 shown in FIG. 2 and described later is provided.

The ROM 22 and the RAMs 23 and 24 are connected to the CPU 21 through a system bus 29, and the system bus 29 has interface circuits (ports) 25 to 25.
28 is connected.

Then, the interface circuit 25 supplies tuning data to the tuner circuit 12, and the tuning is executed. Further, the demodulation signal from the FM demodulation circuit 14 is supplied to the decoder circuit 41, and the LMSK signal is converted into the F signal.
The data in the M character multiplex broadcast is decoded and taken out, and this data is transferred to the R through the interface circuit 26.
Written to AM24. The data in the RAM 24 is constantly updated with the latest data.

The interface circuit 27 is also connected to various operation keys 42 composed of non-lock type push switches, and the key outputs thereof are fetched by the microcomputer 20. Thus, when any one of the operation keys 42 is pressed, the pressed key is discriminated by the CPU 21, and the process corresponding to the pressed key is executed.

However, when the FM receiver is mounted on a vehicle,
Since the operation panel is narrow and a large number of operation keys cannot be arranged, in this example, the operation key 42 is
Only keys with high operation frequency and keys with high importance are used, and other operations are performed by a remote controller (remote operation).

Therefore, the interface circuit 27 includes
The receiving circuit 43 of the remote controller is also connected. In this example, the remote control is of infrared type, and the receiving circuit 43 is
The remote control transmitter 60 has a light receiving element for receiving infrared rays and a decoder circuit for decoding a remote control signal from the light receiving element.

Further, the remote control transmitter 60 is also provided with various operation keys 62 (62A to 62N) constituted by non-lock type push switches. Although a part of the operation key 62 has the same function as the operation key 42, when an arbitrary key of the operation keys 62 is pressed, data corresponding to the pressed key is formed and converted into infrared rays. Sent to FM receiver.

In the FM receiver, the infrared ray transmitted from the remote controller transmitter 60 is received by the receiving circuit 43, the original data is taken out, and this data is supplied to the interface circuit 27. Thus, similarly to the case where the operation key 42 is pressed, when the operation key 62 is pressed, the processing corresponding to the pressed key is executed by the microcomputer 20. In the following, the operation of each unit will be described depending on the case where the operation key 62 of the remote control transmitter 60 is used.

A beep sound signal forming circuit 44 is connected to the interface circuit 28, and the beep sound signal from this is supplied to the amplifier circuits 16L and 16R.

Further, the system bus 29 is connected with a font ROM (character generator) 31 having font data for converting the character code sent by the FM character multiplex broadcasting into display data, and a display memory. 32 and the display controller 33 are connected, and the display controller 33 is connected to, for example, the LCD 50 as a display element.

The LCD 50 is the LC shown in FIG. 7 and described above.
Similar to D1, it has a display screen that can display 15.5 characters × 2.5 lines, of which the lower left 15 characters × 2 lines is the text display area and the upper 0.5 lines. The 0.5 character portion on the right and the right is used as a header sentence display area.

The display memory 32 is of a bit map type corresponding to the dot display type of the LCD 50, and
It is assumed to have the capacity for the screen.

The character code stored in the RAM 24 is read by the CPU 21, the read character code is converted into display data by the font data of the ROM 31, and the display data is written in the memory 32. At this time, the display controller 33 repeatedly reads the display data from the memory 32, converts the display data into a display signal, and supplies the display signal to the LCD 50. Therefore, C is displayed on the display screen of the LCD 50.
The characters of the character code read out from the RAM 24 by the PU 21 are displayed.

Of the operation keys 62 of the remote control transmitter 60, the operation key 62C is the program information key especially provided in the present invention. When the program information key 62C is pressed, the CPU 21 calls the program information directly on the display screen of the LCD 50 or calls the program called immediately before calling the program information by the program information routine 100 shown in FIG. .

That is, in the state where the program by the character multiplex broadcasting is selected and a certain page of a certain program is displayed on the display screen of the LCD 50, the program information key 62 is displayed.
When C is pressed, the CPU 21 firstly executes step 101.
At, it is determined whether or not the program information is currently displayed on the display screen.

For example, as shown in FIG. 3A, when a page of a program that is not program information is displayed on the display screen 51, such as a weather forecast page is displayed on the display screen 51, When the CPU 21 determines in step 101 that the program information is not currently displayed on the display screen 51 by pressing the program information key 62C, the CPU 21 then actually displays the display screen 51 on the display screen 51 in step 102. The service identification, program number and page number of the program displaying the page are stored.

Further, the CPU 21 proceeds to step 103, reads the character data of the program information having the determined service identification and the program number of "254" as described above from the RAM 24, and then, as shown in FIG. As shown in B), the program information page is displayed on the display screen 51. If the program information extends over a plurality of pages, the first page is displayed.

In this case, as described above, the character code held in the RAM 24 is read by the CPU 21, the read character code is converted into display data by the font data of the ROM 31, and the display data is stored in the memory. The display data written in 32 is read out repeatedly by the display controller 33, converted into a display signal and supplied to the LCD 50, so that a page of program information is displayed on the display screen 51.

As shown in FIG. 3 (B), when the program information page is displayed on the display screen 51, the program information key 62C is pressed, so that the step 101
In, when the CPU 21 determines that the program information is currently being displayed on the display screen 51, the CPU 21
Next, in step 104, the program is displayed on the display screen 51 according to the service identification, the program number, and the page number of the program displayed immediately before the program information is displayed on the display screen 51, which is stored in step 102. The character data of the program displayed immediately before the information is displayed is read from the RAM 24, and the program displayed immediately before the program information is displayed on the display screen 51, as shown in FIG. Display the page of.

Therefore, according to this example, when the user is listening to the original audio broadcast program and wants to see the program information linked thereto, the user once operates the total table of contents key to display the total information on the display screen 51. It is not necessary to select the program information after displaying the table of contents, and the program information to be viewed can be immediately viewed by pressing the program information key 62C.

Also, when trying to view the program that was being watched before viewing the program information, the total table of contents key is once operated to present the total table of contents on the display screen 51, and then the program is selected. It is not necessary to press the program information key 62C, so that the program that was being watched before the program information was viewed can be immediately watched.

In the above example, the remote control transmitter 60 is used to perform various operations.
Alternatively, the operation key 42 of the receiver can be used.

[0067]

As described above, according to the present invention, F
When a user wants to view program information (main complementary program) in a receiver that receives character multiplex broadcasting such as M-character multiplex broadcasting, he / she can immediately watch the program information with a simple operation and watch the program information. When you're trying to watch a program you've been watching before, you can watch it immediately with a simple operation.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a receiver of the present invention.

FIG. 2 is a diagram showing an example of a program information routine executed by the control unit.

FIG. 3 is a diagram for explaining calling of program information.

FIG. 4 is a diagram showing a frame structure of an LMSK signal in FM character multiplex broadcasting.

FIG. 5 is a diagram showing the structure of the data packet.

FIG. 6 is a diagram showing the structure of the prefix.

FIG. 7 is a diagram showing a display element provided in a receiver compatible with level 1 of FM text multiplex broadcasting.

FIG. 8 is a diagram showing a display example of the display screen.

FIG. 9 is a diagram showing a display example of the display screen.

FIG. 10 is a diagram showing a display example of the display screen.

[Explanation of symbols]

 12 tuner circuit 14 FM demodulation circuit 15 stereo demodulation circuit 20 microcomputer 21 CPU 24 RAM (for reception buffer) 31 font ROM (character generator) 32 memory (for display) 33 display controller 41 decoder circuit 42 operation keys 50 LCD 60 remote control transmission Machine 62C Program information key 100 Program information routine

Claims (1)

[Claims] 1. A receiving circuit for receiving a character multiplex broadcast, a memory for storing character data received by the receiving circuit, a display element for displaying characters according to the character data, and a main display on a screen of the display element. A program information key for displaying character information of a complementary program and a control unit are provided. When the character information of a program that is not the main complementary program is displayed on the screen of the display element, the control unit is displayed. When the program information key is operated, the character data of the main complementary program is read from the memory to display the character information of the main complementary program on the screen of the display element, and When the program information key is operated while the character information of the main complementary program is displayed on the screen, the screen of the display element is displayed immediately before the character information of the main complementary program is displayed. The character information of the program that has been displayed on the display on the screen of the display device, the receiver.