JP2000151439A - Fm multiplex broadcasting reception method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To return a system to an original page when key-in C is inputted and to provide satisfactory operability by displaying information of a page shown by means of page management data preserved by the input of key-in C (return). SOLUTION: A control part 15 preserves the service identification code, the program number and the page number of a page displayed at present in an outer memory 18 as page management data. The control part 15 monitors data outputted from an FM multiplex decoding part 14 and judges whether the take-in of prescribed data completes or not. When the take-in of prescribed data completes, information of the page which is taken in is displayed on a display part 16. The control part 15 checks whether an inputted key is key-in C or not. When it is key-in C as the result, page management data preserved in the outer memory 18 is referred to, information of the original page is taken in and the original page is displayed on the display part 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an FM multiplex broadcast receiving method for an FM multiplex broadcast receiver having a character information display function.

[0002]

2. Description of the Related Art In recent years, FM broadcasting stations multiplexed FM broadcasts with weather forecasts, news, traffic information, and information (for example, song titles of music being broadcasted) linked to radio programs being broadcast. Sent as information. Further, an FM multiplex broadcast receiver that receives such information and displays character information on a display screen of, for example, 2.5 lines or 8.5 lines has been commercialized.

There are two types of FM multiplex broadcast receivers, a recording reception type and a standby reception type. In a recording / reception-type receiver, FM multiplexed character information is recorded in a memory, and corresponding information is read out from the memory as appropriate according to a user operation and displayed on a display screen. However, if all of the FM multiplexed character information is to be recorded, the required memory capacity becomes enormous, which makes it difficult to realize. In addition, the amount of data transmitted from a broadcasting station tends to increase year by year. Therefore, in general, information exceeding the memory capacity is truncated.

When a user sets a desired program (text information program), the standby reception type receiver waits until data of the program is transmitted from a broadcasting station. Then, when the data of the set program is transmitted from the broadcasting station, the data of the program is fetched and displayed on the display screen.

FIG. 9 is a schematic diagram showing an example of a hierarchical structure of character information (general information level 1) multiplexed in FM broadcasting. As shown in FIG. 9, the character information multiplexed on the FM broadcast has a hierarchical structure. In this example, there is a main menu on the first hierarchy, and the main menu is linked to submenus A to E on the second hierarchy. In this example, the second hierarchy includes a submenu F that is not linked from the main menu. The submenus B to F are programs B1 to B6, C1 to C6, and D1 to third layer, respectively.
D3, E1 to E5, and F1 to F5. The submenu A is character information linked to the program being broadcast, and the received information needs to be sequentially displayed on the display unit.

FIGS. 10A to 10D are views showing an example of a screen display of the FM multiplex broadcast receiver. However, FIG.
(A) to (d) are display examples in the case of general information level 1 (2.5-line display character information). In this case, the operation of moving to the lower hierarchy (key-in 1 to key-in 1) is provided to the FM multiplex broadcast receiver.
6), an operation of moving to the previous or next page in the same hierarchy (key-in A, B) and an operation of returning to the upper hierarchy (key-in C) are defined. Further, the FM multiplex broadcast receiver is provided with keys corresponding to these operations. For example, FM
The multiplex broadcast receiver has "1" corresponding to key-ins 1 to 6.
There are provided "Page Up" and "Page Down" keys corresponding to the number keys ".about.6", key-ins A and B, and "return" key corresponding to the key-in C.

When the FM multiplex broadcast receiver starts receiving the FM multiplex broadcast, it waits until the information of the main menu is transmitted. For example, as shown in FIG. 10A, the display screen indicates that data is being received. Display a message. In the case of a recording / reception type receiver, information of another layer received during this time is recorded in a memory.

[0008] When the information of the main menu is received, the FM multiplex broadcast receiver displays a main menu screen as shown in FIG. If, for example, the numeric key “4” is pressed while this screen is displayed (key-in 4 is input), the FM multiplex broadcast receiver displays the screen shown in FIG. In this example, it waits until traffic information is received. Then, when the corresponding information is transmitted from the broadcasting station, the information is fetched, and the information shown in FIG.
The acquired information is displayed on the screen as shown in (c).

When the number key "1" is pressed (key-in 1 is input), the FM multiplex broadcast receiver is turned on as shown in FIG.
The screen shown in (a) is displayed, and the apparatus waits until the first information (in this example, general expressway) is received. Then, when the corresponding information is transmitted from the FM broadcasting station, the information is fetched and the first page of the fetched information is displayed on the screen as shown in FIG. In the case of a recording / reception type receiver, if the corresponding information is already recorded in the memory, the information is read from the memory and displayed on the screen.

[0010]

In the conventional FM multiplex broadcasting receiver, when the key-in C is input, the display returns to the uppermost layer, that is, the main menu. this is,
For example, if the key-in C is input before the reception of the information is completed, it is not possible to know which layer the user is currently in, so that the return destination is prevented from being uncertain.

For this reason, in the conventional FM multiplex broadcasting receiver, when the key-in C is input, it is necessary to press the key several times to return to the original page from the main menu, and the operation is complicated.

Accordingly, an object of the present invention is to provide an FM multiplex broadcast receiving method which can return to the original page by inputting key-in C and has good operability.

[0013]

SUMMARY OF THE INVENTION An object of the present invention is to provide an FM multiplex broadcast receiving method for receiving FM multiplexed character information and displaying it on a display unit, wherein page management data of a page being displayed on the display unit is stored. Then, the fetching of the information of the next page is started, and the input of the key-in C displays the information of the page indicated by the stored page management data.

The operation of the present invention will be described below.

In the present invention, after the page management data of the page being displayed is stored on the display unit, the acquisition of the information of the next page is started. When the key-in C is input, the information of the page indicated by the page management data is displayed on the display unit with reference to the stored page management data. As described above, in the present invention, since the page management data is stored before the page is moved, the user can return to the original page by inputting the key-in C, and the operability is lower than the conventional method of returning to the main menu Is significantly improved.

In the case of FM multiplex broadcasting, a service identification code,
The page is specified by the program number and the page number. Therefore, it is preferable to save at least these data as the page management data. If display data is also stored in addition to the page management data, the stored display data can be read out by input of key-in C and the original page can be displayed in a short time.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a configuration of an FM multiplex broadcast receiver for realizing the FM multiplex broadcast reception method according to the embodiment of the present invention. The FM multiplex broadcasting receiver includes an FM receiving unit 1
1, intermediate frequency amplification / detection circuit 12, stereo demodulation circuit 1
3, FM multiplex decoding section 14, control section 15, display section 1
6, operation unit 17, external memory (RAM) 18, and kanji R
OM19.

The control unit 15 is constituted by a microcomputer, and comprises an operation unit 17, an external memory 18, a kanji character R
It is connected to the OM 19, the display unit 16, the FM receiving unit 11, and the FM multiplex decoding unit 14. The operation unit 17 includes a channel selection key for setting a reception frequency, numeric keys from “1” to “6” (corresponding to key-ins 1 to 6) for selecting a program of character information, and “page up”. ”Key (corresponding to key-in A),“ page down ”key (key-in B
) And a “return” key (corresponding to key-in C). The control unit 15 sets a reception frequency based on a signal output from the operation unit 17 and selects a program to be displayed on the display unit 16.

In the external memory 18, the control unit 15
Character data to be displayed on the display unit 16 and management information (service identification, program number, page number, etc.) of the page being displayed are temporarily stored.

The FM receiver 11 controls the reception frequency by the controller 1
The FM broadcast is received in accordance with the frequency designated by 5, and is converted into an intermediate frequency signal and output. Intermediate frequency amplification /
The detection circuit 12 amplifies the intermediate frequency signal output from the FM receiving unit 11, and then detects and outputs an FM detection signal. The stereo demodulation circuit 13 stereo-demodulates the FM detection signal output from the intermediate frequency amplification / detection circuit 12 and outputs right channel (R) and left channel (L) audio signals. These audio signals are amplified by an amplifier (not shown) and then supplied to a speaker to drive the speaker.

The FM multiplex decoding unit 14 extracts and decodes FM multiplexed information from the FM detection signal output from the intermediate frequency amplification / detection circuit 12.

The control unit 15 inputs the information decoded by the FM multiplex decoding unit 14 and temporarily stores the information in the external memory 18. Then, referring to the kanji ROM 19, the input information is converted into characters and displayed on the display unit 16. The display unit 16 is a liquid crystal display device capable of displaying, for example, 2.5 lines (60 × 248 dots).

FIG. 2 is a diagram showing a data format of information transmitted by FM multiplexing. In FM multiplex broadcasting, information is transmitted in packet units. One packet is composed of a 32-bit prefix and a 144-bit data block. The prefix includes a 4-bit service identification code, a 1-bit decoding identification flag, a 1-bit information end flag, a 2-bit update flag, a 14-bit data group number, and a 10-bit data packet number.

The service identification code is a code for identifying the provided service, and the value of the service identification code can determine the provided service as shown in FIG. That is, when the service identification code is 1, the general information level is 1.
(Sequential reception), which indicates that the information is linked to the program (music, etc.) currently being broadcast. When the service identification code is 2, it is general information level 1 (recording reception),
It can be seen that the character information is displayed on the display screen for two lines. General information level 2 when the service identification code is 3
(Recording reception), which indicates that the information is character information (including simple figures) displayed on the display screen for eight lines. The traffic information levels 1 to 3 indicated by the service identification codes 4 to 6 are traffic information mainly used in combination with the in-vehicle navigation device.

The decoding identification flag is transmitted to the FM multiplex decoding unit 14.
Indicates a decoding method at the time of decoding, and "1" indicates decoding only in the horizontal direction, and "0" indicates horizontal, vertical, and horizontal decoding. The information end flag indicates whether or not the data group to be transmitted with a certain data group number has ended. When "1", the data group ends, and when "0", other cases are indicated. The data group number is a number assigned to each data group. The data packet number indicates the number of the data packet transmitted for each data group number.

As shown in FIG. 4, one data group is composed of a plurality (N) of data blocks. The data group includes an 8-bit SOH (heading start code), a 7-bit data group size, and a 1-bit DOH.
GL (data group link code), 8-bit data group size, 8-bit × n (n is an integer) data group data, NULL data for length adjustment, 8-bit data group end code, and 16 bits for error correction CR
It is composed of C (Cyclic Redundancy Code).

SOH is a code indicating the start of a data group. The data group header is composed of 7-bit data (data group size) indicating the upper order and 8-bit data (data group size) indicating the lower order.
15 bits indicate the total number of bytes of the data group data. DGL is a code indicating the presence or absence of connection of a data group. When DGL is "1", it indicates that the data group is connected to the next data group, and when DGL is "0", it indicates that there is no connection.

The data group data is a set of information data such as program management data and page data, and one data group usually corresponds to one display unit (one page).

The NULL for length adjustment is added as needed between the data group data and the data group end code in order to make the bit length of one data group N times the bit length of the data block.

The data group end code is a code indicating the end of the data group, and the CRC is a code for error detection for each data group.

The data group data is an 8-bit RS.
(Information separating code), 8-bit data header parameter, data header data of arbitrary bits (the number of bits changes depending on the content of the data header parameter), and a plurality of data units. The numerical value of the data header parameter indicates the data header data and the data header length as shown in FIG.

FIG. 6 is a diagram showing the structure of data header data when the data header parameter is 30H, and FIG. 7 is a diagram showing the structure of data header data when the data header parameter is 32H. Data header parameter is 3
When 0H, the data header data includes data of the program number, content update (presence / absence), total number of pages, presentation function (character or graphic, etc.), information type, and display format (level 1 or level 2). It is.

When the data header parameter is 32H, the data header data includes information on the program number, content update (presence / absence), page number, presentation function, information type, display format, header raster color, and raster color. .

In the present embodiment, when changing the page display, at least the service type code (FIG. 2) of the various data included in the data format described above is used.
The program number and the page number (see FIGS. 6 and 7) are recorded in the external memory 18 as page management data. The page is specified by these data.

FIG. 8 is a flowchart showing the operation of the FM multiplex broadcast receiving method according to the embodiment of the present invention.

First, in step S11, the control unit 1
5 indicates that information of an arbitrary page is displayed on the display unit 16. In step S12, the control unit 15 checks whether or not there is a key input, that is, whether or not the user has requested to switch the display.
Returning to step 1, the display of the current page is continued. On the other hand, if a key input is detected in step S12, the process proceeds to step S1.
Move to 3.

In step S13, the control unit 15 stores the service identification code, the program number, the page number, and the like of the currently displayed page in the external memory 18 as page management data. Thereafter, the process proceeds to step S14, and the control unit 15 starts receiving the reception of the next page data. Then, the process proceeds to step S15, and the control unit 15 displays "receiving data" on the display unit 16.

Thereafter, the flow shifts to step S16, where the control unit 15 monitors the data output from the FM multiplex decoding unit 14, and determines whether or not the fetch of the predetermined data is completed. If the loading of the predetermined data is completed, the process proceeds to step S21, and the information of the loaded page is displayed on the display unit 16.

On the other hand, if it is determined in step S16 that the data capture has not been completed, the flow shifts to step S17, and the control unit 15 checks whether a key input has been performed. If there is no key input, the process returns to step S15, and the above processing is repeated.

When a key input is detected in step S17, the process proceeds to step S18, and the control unit 15 checks whether the input key is key-in C ("return"). Then, in the case of key-in C, the process proceeds to step S19,
Referring to the page management data stored in the external memory 18,
The information of the original page (the page displayed in step S11) is fetched. After that, the process shifts to step S21 to display the original page on the display unit 16.

On the other hand, if the input key is not the key-in C in step S18, the flow shifts to step S20 to perform processing corresponding to the input key. For example, in the case of key-in A (“page-up”) or key-in B (“page-down”), the data of the previous or next page in the same hierarchy is fetched by referring to the page management data stored in the external memory 18. Then, the process shifts to step S21 to display the captured data on the display unit 16.

In this embodiment, as described above, before changing the displayed page, the page management data of the currently displayed page, that is, the service identification code, the program number, and the page number are stored in the external memory 18. Keep it. When the key-in C (“return”) is input, the page management data recorded in the external memory 18 is read, and the corresponding page is received. Therefore, in the FM multiplex broadcast receiving method of the present embodiment, the original page is displayed without returning to the main menu unconditionally by key-in C.
For example, key-in 1 is input on the screen of FIG.
When the key-in C is input while the screen 0 (a) is displayed, the conventional FM multiplex broadcast receiver receives the key-in C shown in FIG.
In order to see the traffic information on the general road, it is necessary to input the key-in 4 and wait until the screen shown in FIG. 10C is displayed, and then input the key-in 3. However, in the FM multiplex broadcast receiving method of the present embodiment, if key-in 1 is input on the screen of FIG. 10C and key-in C is input while the screen of FIG. Returning to the screen of (c), when the key-in 3 is input on this screen, traffic information on general roads is displayed. As described above, the operability of the FM multiplex broadcast receiving method according to the present embodiment is significantly improved as compared with the conventional method.

In the above embodiment, the service identification code, the program number, and the page number are stored as page management data. However, display data may be stored in the external memory 18 together with these data. In this case, there is no need to wait for the corresponding data to be sent from the broadcast station in step S19, and the original page can be displayed in a short time.

[0045]

As described above, according to the FM multiplex broadcast receiving method of the present invention, the fetching of the information of the next page is started after the page management data of the page being displayed is stored on the display unit. When the key-in C is input, the original page can be displayed by referring to the stored page management data. As a result, the number of operations until the original screen is displayed is reduced as compared with the conventional method of returning to the main screen by inputting the key-in C, and the operability is significantly improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an FM multiplex broadcast receiver that realizes an FM multiplex broadcast reception method according to an embodiment of the present invention.

FIG. 2 is a diagram showing a data format of information transmitted by FM multiplexing.

FIG. 3 is a diagram showing service identification codes and their contents.

FIG. 4 is a diagram showing a configuration of a data group.

FIG. 5 is a diagram showing a data header parameter and a data header data length.

FIG. 6 is a diagram showing a configuration of data header data when a data header parameter is 30H.

FIG. 7 is a diagram showing a configuration of data header data when a data header parameter is 32H.

FIG. 8 is a flowchart illustrating an FM multiplex broadcast receiving method according to an embodiment of the present invention.

FIG. 9 is a schematic diagram showing an example of a hierarchical structure of character information multiplexed on an FM broadcast.

FIG. 10 is a diagram showing an example of a screen display of an FM multiplex broadcast receiver.

[Explanation of symbols]

 11 FM receiving section, 12 intermediate frequency amplification / detection circuit, 13 stereo demodulation circuit, 14 FM multiplex decoding section, 15 control section, 16 display section, 17 operation section, 18 external memory, 19 kanji ROM.

Claims (3)

[Claims] 1. An FM multiplex broadcast receiving method for receiving FM multiplexed character information and displaying the same on a display unit, comprising: saving page management data of a page being displayed on the display unit; Starting the capture and displaying the information of the page indicated by the stored page management data by inputting the key-in C
A multiplex broadcast receiving method. 2. The FM multiplex broadcast receiving method according to claim 1, wherein a service identification code, a program number and a page number are stored as the page management data. 3. The FM multiplex broadcast receiving method according to claim 2, wherein display data of the currently displayed page is stored together with the page management data.