JP3372802B2 - FM multiplex broadcast receiver - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FM multiplex broadcast receiver for receiving a response-progressing program for displaying a corresponding next screen by selecting an option included in a current display screen.

[0002]

2. Description of the Related Art In FM multiplex broadcasting using the DARC (Data Radio Channel) system, characters and figures are converted into digital data and encoded, and a multiplex signal with a subcarrier frequency of 76 kHz is frequency-multiplexed into a stereo baseband signal. FM
It is modulating. Regarding the characters and graphics to be broadcast, three types of service levels from level 1 to level 3 are currently assumed. Level 1 is the text (15 characters x 2
This is a service for receivers that can display (rows) and header lines, and mainly information in characters. Level 2 is a service for receivers that can display the text (15.5 characters x 8 lines) and header lines, and is suitable for sending graphics and maps. Level 3 provides a traffic information data service for a car navigation system equipped with a map display on a CD-ROM.

FIG. 14 is a diagram showing a display example in a conventional FM multiplex broadcast receiver, and as an example, a display example corresponding to the level 1 service described above is shown. FIG. 1A shows an example of displaying a program of response progress,
The first page and the second page of the display can be switched by pressing a "page feed" key or a "page return" key provided in the receiver. Further, since the program is a response progressing program, for example, by selecting any number from the options “1” and “2” displayed on the screen of the first page and keying in, the screen display of the corresponding program Can be switched to. FIG. 14B is a display screen of the first page of “News & Sports” when “2” is selected on the first page screen shown in FIG. 14A, for example, and there is a second page. Can be switched to each other by pressing the "Page Forward" key. Figure 1
FIG. 4C is a specific display of “News & Sports (nationwide)” when the option “1” is selected on the first page of the “News & Sports” display screen shown in FIG. 14B. It is a content screen.

It should be noted that, as shown in FIGS. 14 (A) and 14 (B), a display screen having an option for selecting the next screen is an upper layer screen, and a display screen as shown in FIG. 14 (C). A screen that does not include options is referred to as a lowermost layer screen for explanation. In addition, in the upper layer screen, FIG.
As shown in (A), the upper layer screen of one page or a plurality of pages that is first displayed in the program of response progress is selected based on the main menu screen, and as shown in FIG. The upper layer screen is the sub menu screen.

As described above, in the program of response progress,
You can select the sub-menu screen while viewing the main menu screen, and further select the bottom layer screen that contains the information you want to see while viewing this sub-menu screen, so it is necessary according to the preference of each user. You can see only the relevant information.

[0006]

By the way, in the above-mentioned conventional FM multiplex broadcasting receiver, when displaying the program of the response progress, after seeing any information displayed on the bottom layer screen, The operation was complicated when I wanted to see the information. For example, in the submenu screen 1 shown in FIG.
From the first page, "1: News & Sports (nationwide)"
After displaying the specific contents shown in FIG. 14 (C) and trying to see the contents of “3: Business trend” on the second page of the submenu screen, the bottom layer screen In the display, first press the "Return to top" key to display the first page of the submenu screen, then in this state, press the "Page forward" key to display the second page of the submenu screen, then You must key in "3" corresponding to the "business trend" that is the information you want. The final information you want to see is the contents of the bottom layer,
In order to switch this, it is necessary to return to the submenu screen one level above, and since it is not possible to operate by skipping the submenu screen, the number of key operations increases,
It lacks operability. Further, when considering an on-vehicle FM multiplex broadcast receiver, the greater the number of operations during driving, the greater the danger during driving.

The present invention was created in view of the above points, and its purpose is to reduce the trouble of switching the lowermost layer screen of the program of response progress and improve the operability of the FM multiplex broadcasting receiver. To provide.

[0008]

In order to solve the above-mentioned problems, the FM multiplex broadcast receiver of the present invention is included in the upper layer screen when displaying the lowermost layer screen that does not include options. When any of the options is selected, other screens are displayed directly without switching the display to the upper layer screen, and it is necessary to see other information displayed on other screens. The number of operations can be reduced.

Specifically, an FM multiplex broadcast receiver is
FM multiplex broadcast receiving means for demodulating program data relating to response progress programs included in multiplex broadcasting, display means for selectively displaying an upper layer screen and a lowermost layer screen based on the program data, and an upper layer screen being displayed. The first display switching means for switching the display to the lowermost layer screen corresponding to any one of the options included in this screen, and conversely when the lowermost layer screen is displayed. A second display switching unit that switches the display to another screen corresponding to an option included in the screen is selected.

In particular, the program data described above includes page data corresponding to each of the upper layer screen and the lowermost layer screen, and the page data corresponding to the upper layer screen corresponds to each option of the upper layer screen. A selection control data unit including destination data indicating a relationship with the lowermost layer screen is included, and the first control means described above performs display switching from the upper layer screen to the lowermost layer screen based on this destination data. You can The second display control means stores the destination data during the display of the upper layer screen,
When the lowermost layer screen is displayed, the display can be switched to another lowermost layer screen different from the currently displayed lowermost layer screen based on the destination data.

Further, as a concrete example corresponding to the actual FM multiplex broadcasting, a predetermined number is assigned as an option included in the upper layer screen, and as the destination data, a destination page number corresponding to each number and a necessary number are required. In this case, the destination program number and the destination service identification are included. By using this destination data, the correspondence between the upper-layer screen and the lower-layer screen for switching the display becomes clear. Therefore, by storing this content, the lower-layer screens can be displayed without returning to the upper-layer screen each time. Can be switched.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An FM multiplex broadcasting receiver to which the present invention is applied selects another lowermost layer screen without returning to the upper layer screen in the state of displaying the lowermost layer screen when receiving a program of response progress. The feature is that it is displayed. Hereinafter, an FM multiplex broadcast receiver according to an embodiment will be described with reference to the drawings.

FIG. 1 shows an F of an embodiment to which the present invention is applied.
It is a figure which shows the structure of an M multiplex broadcast receiver. F shown in the figure
The M multiplex broadcast receiver 1 includes a front end (F / E) 12 and an intermediate frequency amplification / FM detection circuit (IF) for extracting stereo sound from an FM broadcast signal received by an antenna 10.
/ DET) 14 and a noise canceller / stereo demodulation circuit (NC / MPX) 16, and a filter circuit 18 and a LMSK (Level controlled Minim) to separate and demodulate FM multiplex broadcast data included in the received FM broadcast signal.
um Shift Keying) A demodulation circuit 20, a synchronization circuit 22, and an error detection / correction circuit 24 are provided, and by performing various processes on the separated FM multiplex broadcast data, various information by characters and figures is displayed on the display unit 36. CPU3 to display
0, a data storage RAM 32, and a display RAM 34. The FM multiplex broadcast receiver 1 also includes an operation unit 40 having various operation keys for the user to operate. For example, the "Page Forward" key and "Page Back" for switching multiple display screens of the same program.
It is provided with a key, a "return to the top" key for returning from the lower layer screen to the upper layer screen, and at least ten keys of "1" to "6".

The front end 12 includes an antenna tuning circuit, a high frequency amplifying circuit, a local oscillating circuit, a mixing circuit, etc., and performs high frequency amplification on the FM broadcast signal input from the antenna 10 and performs predetermined frequency conversion. I do. For example, when an FM broadcast signal having a desired frequency to be received is input to the front end 12, 10.7 MH
z intermediate frequency signal. Intermediate frequency amplification / FM
The detection circuit 14 amplifies the intermediate frequency signal output from the front end 12 and performs a tuning operation to perform FM detection on the tuning result. Further, the noise canceller / stereo demodulation circuit 16 is configured to
After the noise component contained in the FM stereo composite signal after FM detection output from the FM detection circuit 14 is removed, the L component and the R component of stereo sound are separated.

The filter circuit 18 is for separating the multiplexed signal contained in the signal after the FM detection.
As shown in FIG. 2, the signal after FM detection has a frequency of 76 kHz.
The FM multiplex broadcast signal before and after is included, and only this FM multiplex broadcast signal is extracted by the filter circuit 18.
The LMSK demodulation circuit 20 performs differential detection on the LMSK modulated signal that is the multiplexed signal output from the filter circuit 18, and recovers the bit clock and demodulates the bit data string. The synchronization circuit 22 detects block synchronization and frame synchronization for the bit data string output from the LMSK demodulation circuit 20, and the error detection and correction circuit 24.
Is a CRC for this synchronized bit data sequence.
(Cyclic Redundancy Check) performs error detection and corrects any errors. For example,
The error correction is performed by using a product code in which the (272,190) shortened difference set cyclic code is used vertically and horizontally, and the error correction is performed with high probability.

The CPU 30 extracts group data and program data based on the data (data packet) output from the error detection / correction circuit 24. The extracted program data is stored in the data storage RAM 32. The display RAM 34 stores bit data corresponding to a display image, and the stored contents are displayed on the display unit 36.

The front end 12, the intermediate frequency amplification / FM detection circuit 14, the filter circuit 18, the LMSK demodulation circuit 20, the error detection / correction circuit 24, the CPU 30 and the data storage RAM 32 described above are included in the FM multiplex broadcast receiving means and the display section 36. Corresponds to the display means, and the first and second display switching means correspond to the CPU 30 and the data storage RAM 32, respectively. Further, more specifically, the first display switching unit corresponds to each operation of Steps 200 to 206 of FIG. 13 described later, and the second display switching unit of Steps 202 to 207 of FIG. 13 described later. It corresponds to each operation.

Next, the hierarchical structure of FM multiplex broadcasting using the DARC system will be described. The hierarchical structure of the DARC that is the target of the processing by the FM multiplex broadcast receiver 1 described above includes a layer 1 for a transmission path, a layer 2 for error correction, a layer 3 for a data packet, a layer 4 for a data group, and a program. 5 is included.

Layer 1 for the transmission path corresponds to the signal (baseband signal) after FM detection output from the intermediate frequency amplification / FM detection circuit 14 described above. As shown in FIG. 2, the signal after FM detection has an FM of around 76 kHz.
The multiplex broadcast signal is included. Only the FM multiplex broadcast signal is separated by the filter circuit 18, and the FM multiplex broadcast signal corresponding to this FM multiplex broadcast signal is obtained by passing through the LMSK demodulation circuit 20.

Layer 2 for error correction shows a frame structure for error detection and error correction. Figure 3
FIG. 3 is a diagram showing a frame structure corresponding to layer 2. As shown in the figure, the FM multiplex broadcast data output from the LMSK demodulation circuit 20 consists of a total of 272 blocks per frame, of which 190 blocks are blocks containing data packets and the remaining 82 blocks are parity packets. It is a block including. The 82 blocks are arranged in a distributed manner among blocks including data packets.

Each block including a data packet has a 16-bit block identification code BIC (Block Iden).
tify Code), a data packet composed of 176-bit data, a 14-bit CRC code, and an 82-bit error detection / correction parity (horizontal code). A block including a parity packet is composed of a 16-bit block identification code BIC, a 190-bit parity (vertical code) packet, and an 82-bit error correction parity (horizontal code).

The identification code of the first 13 blocks including the data packet is BIC1, and the identification code of the next 123 blocks including the data packet is BI.
C3, the identification code of the next 13 blocks including the data block is BIC2, and the identification code of the last 123 blocks including the data block is BI.
It is C3. The identification code of each block including the parity packet is BIC4.

The synchronizing circuit 22 is a block identification code BIC.
Block synchronization is achieved by detecting the block identification code BIC4 next to the block identification code BIC4.
Is detected, the frame synchronization is established every 272 blocks. Therefore, when the number of times that the block identification code cannot be detected in such an order occurs at a predetermined rate, block synchronization is lost, and when frame synchronization cannot be achieved at a predetermined rate, frame synchronization is lost.

Since the block including the data packet includes the CRC code, and each block included in one frame includes the parity (horizontal code) for error detection and correction. By using the parity, it is possible to perform the correction processing after the error is detected by the error detection / correction circuit 24. Error detection and correction circuit 2
4 outputs only the data packets contained in each block after the error correction is performed in this way.

Layer 3 shows the structure of the data packet, the details of which are shown in FIG. As shown in the figure, each data packet includes a 32-bit prefix and a 144-bit data block.
The prefix at the beginning is added to identify the data block that is the information content, and the service identification S
I, decoding identification flag, information end flag, update flag, data group number, and data packet number. The service identification SI of the first 4 bits is used to identify the program.

Layer 4 shows the structure of a data group formed by collecting a plurality of data blocks included in the above-mentioned data packet. As shown in FIG. 5, the data group includes a start code SOH, a data group link code DGL, a data group size, data group data, a length adjustment NULL, an end code, and a CRC. In this data group, in the data packet of layer 3, data blocks having the same service identification SI, the same data group number, and the same update flag are set in order from the data packet number “0”, and the information end flag is set. Up to. One data group corresponds to one page of data displayed on the display unit 36.

The layer 5 shows the structure of program data formed by collecting a plurality of data group data included in the above-mentioned data group. As shown in FIG. 6, the program data is composed of a plurality of data groups,
The first data group is used as program management data, and the subsequent data group is used as page data. The program management data includes information related to the entire program such as the program number and the total number of pages of the program, and each page data includes information about each page displayed on the display unit 36. Each of these program management data and page data has a common structure, and has a data header including an information separation code RS, a data header parameter, and data header data, and a data unit group following the data header.

FIG. 7 is a diagram showing an example of data header data (program data header data) included in the data header of the program management data. As shown in the figure, the program data header data includes various information such as the program number assigned to each program in the range of 0 to 255 and the total number of pages of the program excluding the program management data.

FIG. 8 shows data header data (page data header data) included in the data header of page data.
It is a figure which shows an example. As shown in the figure, the page data header data includes the program number described above and various information such as the page number in each program.

As shown in FIG. 9, each data unit constituting the data unit group has an information separation code US,
It is composed of a data unit parameter, a data unit size, a data unit link flag code DUL, and data unit data, and the data unit parameter therein indicates the contents of the data unit data.

FIG. 10 is a diagram showing a specific example of the data unit parameter. For example, consider page data corresponding to each page included in a level 1 service capable of displaying a body of 15 characters x 2 lines and a header line. In this page data, a data unit parameter 20H (H is a hexadecimal number) (Indicated by (1)) and a header text data unit of the data unit parameter 24H. In addition, as shown in FIG. 14A, when the corresponding page is a part of a program of response progress including options, this page data includes data other than the above-mentioned header sentence data unit. A selection control data unit for unit parameter 36H is included.

FIG. 11 is a diagram showing details of the data unit data included in the selection control data unit. In the figure, “key-in number” is the FM multiplex broadcast receiver 1
It corresponds to the number entered by operating the operation unit 40 of
For example, it is any of 0 to 6, A, B, and C. here,
A corresponds to moving the display page to the next layer in the same layer, B corresponds to moving the display page to the previous layer in the same layer, and C corresponds to returning the display page to the upper layer. The "destination page number" specifies the page number of the next page whose display is switched according to the key-in number. "Destination program number"
Specifies the program number of the next page whose display is switched according to the key-in number. "Destination service identification number" is
The service identification SI of the next page for switching the display corresponding to the key-in number is specified.

Destination page designation mode "NPS" indicates a mode for designating a destination page. For example, "0
"0" indicates the same service identification SI and page number in the program number as the destination in the corresponding "destination page number".
"01" designates the program number within the same service identification with the corresponding "destination program number", and shows the destination page number with the corresponding "destination page number". “10” indicates the destination program by the corresponding “destination program number”, the destination service identification by the “destination service identification number”, and indicates the page number of the destination by the corresponding “destination page number”.

Next, the F of the present embodiment whose configuration is shown in FIG.
The operation of the M multiplex broadcast receiver 1 will be described. For example, in FIG.
As will be described below, the description will be given by taking the response progress program of the service identification 2 corresponding to the level 1 as an example.

FIG. 13 is a flowchart showing the operation procedure of the FM multiplex broadcast receiver 1 of this embodiment. At the time of FM multiplex broadcast reception, the data of each block shown in FIG. 3 is output from the LMSK demodulation circuit 20, and the synchronization circuit 22 establishes frame synchronization and block synchronization based on the block identification code BIC of the leading 16 bits of each block. . And
The error detection / correction circuit 24 performs error detection based on the CRC added to the data packet and error correction based on the parity when an error is detected. In this way, the error detection / correction circuit 24 outputs the data packet after error correction corresponding to the layer 3 and is input to the CPU 30.

The CPU 30 collects data blocks having the same data group number based on the service identification SI, update flag, etc. included in the prefix of sequentially input data packets, and collects the data blocks corresponding to the layer 4 (program management data). (Or page data) is created, and program data having the same program number included in the data header of each data group are collected to create program data corresponding to the layer 5. The service identification 2 corresponds to the recording / reception mode, and after all the data of the program data (or page data) which is the transmission unit is stored in the data storage RAM 32, various information such as news and weather forecast from the display unit 36 is displayed. The presentation process, which is the target action of, is started.

After the operation of storing the data in the data storage RAM 32 described above is completed, the CPU 30 operates as shown in FIG.
Data of page data corresponding to the first page of the main menu screen of the response progress program shown in (A), particularly data unit (text data unit, header text data unit, etc.) necessary for display included in this data R for preservation
It is read from the AM 32, written in the display RAM 34, and the main menu screen is displayed on the display unit 36 (step 200).

Further, in parallel with such a display operation, C
The PU 30 acquires the selection control data corresponding to the main menu screen being displayed (step 201). As described above, the page data of the displayed main menu screen includes the selection control data unit whose specific example is shown in FIG. 11, and the CPU 30 extracts this selection control unit. Next, the CPU 30 acquires data regarding the key-in number that is an option from the data unit data included in the acquired selection control unit, and stores it in the work area secured in a part of the data storage RAM 32 (step 202). In the FM multiplex broadcast receiver 1 of the present embodiment, the selection control data corresponding to the other screen of the program including the display screen and the extraction and storage of the data related to the key-in number of the option included in this screen are simultaneously acquired. Done.

For example, one program is made up of the first and second pages of the main menu shown in FIG. 12A, and when "1: program information" is selected, the service different from the current service identification 2 is selected. The display is switched to the predetermined page of the other program of identification 1, "2: News &Sports"
Suppose that the display is switched to a predetermined page of another program in the same service identification 2 as the current one when the key etc. is selected, for the key-in “1”, the corresponding “destination page number”, “destination program number”, "Destination service identification number"
However, for key-ins “2” to “4”, the corresponding “destination program number” and “destination page number” are extracted from the data unit data included in the selection control data unit.

Next, the CPU 30 determines whether or not any one of the operation keys of the operation unit 40 has been pressed by the user (step 203). If the operation key has been pressed, the operation keys are "1" to "6". Whether it is included in any of them (step 204), and if it is included, it is further determined whether or not this operation key matches the key-in numbers “1” to “4” acquired from the selection control data (step 205). To do. If any one of the determinations in steps 203 to 205 is negative, the process returns to step 203 and the process is repeated. Note that step 20 described above
4, it is determined whether the operation key is in the range of "1" to "6", as described with reference to FIG.
This is because the range of the key-in number is "1" to "6", and the determination process of step 204 may be skipped and the determination process of step 205 may be directly performed.

When the operation key matches any of the key-in numbers "1" to "4" included in the selection control data, for example, when it matches the key-in number "2", the CP
The U30 reads out the destination page number or the like corresponding to the operation key "2" from the destination data stored in step 202. Then, the CPU 30 stores the page data of the page designated by these, particularly the data unit data included in the page data necessary for display, in the data storage RAM 3.
2 and writes it in the display RAM 34, as shown in FIG.
The screen (sub menu screen) shown in FIG.
(Step 206).

After the screen is displayed in this way, the CP
The U30 determines whether the screen displayed in step 206 is the bottom layer screen (step 207). If it is not the lowermost screen, the page data includes a data unit for selection control. In this case, the CPU 30 returns to step 201 and each page data of the program including the currently displayed screen (sub menu screen). The data unit data of the selection control data unit corresponding to is acquired (step 201), the data related to the key-in number which is an option is extracted from the acquired data unit data, and the content of the data storage RAM 32 is updated (step 202). ).

For example, the first and second pages of the sub-menu shown in FIG. 12B constitute another program different from the program on the main menu screen described above, and "1:
If "News & Sports (nationwide)", "2: Fukushima Shimbun News" or "3: Business Trend" is selected, the display is switched to a predetermined page of another program having the same service identification 2 as the current one. The "destination page number" and the "destination program number" corresponding to each of the key-ins "1" to "3" are extracted from the data unit data included in the selection control data unit. When the user presses the numeric keypad “1” of the operation unit 40, for example, in the state where the first page of the submenu screen shown in FIG. 12B is displayed, step 2
At 06, the bottom layer screen not including the options as shown in FIG. 12C is displayed.

After the screen is displayed in this way, the CP
The U30 repeats the determination as to whether or not this display screen is the bottom layer screen (step 207). In the case of the bottom layer screen that does not have the option as shown in FIG. 12C, the corresponding page data does not include the selection control data unit, and in this case, the CPU 30 executes the processing from step 203 onward. repeat. That is, the data storage RAM 32
The user waits for a key input without updating the data relating to the key-in number contained in the selection control data unit corresponding to the immediately preceding submenu screen stored in. For this reason, the user will then
When any of the key-in numbers “1” to “3” included in the sub-menu screen shown in (B) is pressed, for example, “3” is pressed, the current display shown in FIG. 12D is displayed. Another bottom layer screen different from the screen is displayed by one key operation.

As described above, when the FM multiplex broadcast receiver 1 of the present embodiment receives the response progressing program and the display screen is not the bottom layer screen (the main menu screen or the sub menu screen), The data relating to the key-in number corresponding to each display screen is sequentially updated, and the updated data is used to determine the screen to be displayed next. Further, when the display screen is the bottom layer screen, the bottom layer screen to be displayed next is determined by using the data relating to the key-in number corresponding to the submenu screen displayed immediately before.

Therefore, the user only needs to press the key-in number corresponding to the previous sub-menu screen while the bottom layer screen is displayed to select another bottom layer screen different from the bottom layer screen being displayed. Therefore, it is possible to improve the operability by reducing the number of operations required for switching the lowermost layer screen. In particular, considering the FM multiplex broadcast receiver 1 mounted on a vehicle, the reduction in the number of operations also reduces the number of movements of the line of sight of the driver, so that it is possible to indirectly support safe driving.

Further, conventionally, the key-in number "A",
It was possible to call another program only when the selection control unit including the destination data corresponding to "B" and "C" was added to the page data. Although it is inconvenient in that the operation is not constant depending on whether or not different selection control unit data is added, the FM multiplex broadcast receiver 1 of the present embodiment described above always displays the lowest layer screen. Since it is a fixed operation procedure of switching to another lowermost layer screen by using the option included in the previous submenu screen, there is also an advantage that the operation is consistent and the operation is easy to understand.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the above-described embodiment, as an example, a character broadcasting corresponding to level 1 as shown in FIG. 12 was considered, but in the case of having a display screen including a graphic or a response progressing program displaying a character graphic corresponding to level 2. The present invention can be applied.

Further, in the above-described embodiment, when the key-in number which is an option included in the sub-menu screen one level above is selected while the lowermost layer screen is displayed, the key-in number is designated by the selected key-in number. Although the display is switched to another lowermost layer screen, two or more upper layer screens may be directly selected while the lowermost layer screen is being displayed. In this case, in step 202 of the operation procedure shown in FIG. 13, the data relating to the key-in number stored in the data storage RAM 32 is not sequentially updated, but is stored with a different identifier for each layer. For example, FIG. 12 (A)
The destination data etc. corresponding to the main menu screen shown in are stored by associating "0" with the 2-digit number of the key-in number,
The destination data corresponding to the sub-menu screen shown in FIG. 12B is stored by associating "1" with the two-digit number of the key-in number. Then, when the lowest layer screen is displayed, for example, if "3" is pressed after "1", the screen shown in FIG.
When the display switches to the bottom layer screen shown in, and "3" is pressed after "0", it is displayed when "3: Weather forecast" on the second page of the main menu screen of Fig. 12 (A) is selected. The display is switched to the displayed screen (not shown).

The FM multiplex broadcast receiver 1 described above is
Although the FM broadcast receiving unit and the display unit 36 are integrated, the respective components do not necessarily have to be integrated. For example, a separate FM receiving receiver may be provided in a car navigation system. The display may be connected to the navigation system display.

[0051]

As described above, according to the present invention, when one of the options included in the upper layer screen one level higher is selected while the lowermost layer screen that does not include options is displayed, Without switching the display to the upper layer screen once,
Since another screen is directly displayed, the number of operations required for switching the display to another screen containing other information can be reduced.

Specifically, the page data corresponding to the upper layer screen includes a selection control data unit including destination data indicating the relationship between each option of the upper layer screen and the lowermost layer screen, By using this destination data stored during the display of the screen to switch the screen during the display of the bottom layer screen, the display switching from the currently displayed bottom layer screen to another bottom layer screen is performed. It can be done in a single operation.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an FM multiplex broadcast receiver of an embodiment to which the present invention is applied.

FIG. 2 is a diagram showing a transmission path signal of layer 1;

FIG. 3 is a diagram showing a frame structure corresponding to layer 2;

FIG. 4 is a diagram showing a structure of a layer 3 data packet.

FIG. 5 is a diagram showing a structure of a data group of layer 4;

FIG. 6 is a diagram showing a structure of program data of layer 5;

FIG. 7 is a diagram showing an example of data header data included in a data header of program management data.

FIG. 8 is a diagram showing an example of data header data included in a data header of page data.

FIG. 9 is a diagram showing the contents of each data unit forming a data unit.

FIG. 10 is a diagram showing a specific example of data unit parameters included in each data unit.

FIG. 11 is a diagram showing details of data unit data included in a selection control unit.

FIG. 12 is a diagram showing a display example of the FM multiplex broadcast receiver of the present embodiment.

FIG. 13 is a flowchart showing an operation procedure of the FM multiplex broadcast receiver of this embodiment.

FIG. 14 is a diagram showing a display example of a conventional FM multiplex broadcast receiver.

[Explanation of symbols]

1 FM multiplex broadcasting receiver 12 Front end (F / E) 14 Intermediate frequency amplification / FM detection circuit (IF / DET) 16 Noise canceller / stereo demodulation circuit (NC / M)
PX) 18 Filter circuit 20 LMSK demodulation circuit 24 Error detection / correction circuit 30 CPU 32 Data storage RAM 34 Display RAM 36 Display section 40 Operation section

Claims (2)

(57) [Claims] 1. An upper layer screen and a lower layer screen relating to a response progress program included in an FM multiplex broadcast received therein.
FM multiplex broadcast receiving means for demodulating program data including page data corresponding to each of the above, and an upper layer screen including options and a lowermost layer screen including no options, based on the program data. Display means for displaying and selection included in page data corresponding to the upper layer screen
It is included in the upper layer screen from the control data unit.
Destination data indicating the relationship between the
Any of the above options while extracting and displaying the upper layer screen
Is selected based on the destination data
Display switching to the bottom layer screen corresponding to the selected options
The first display switching means for performing the above
Corresponding to the upper layer screen by the first display switching means
Store the extracted destination data and display the bottom layer screen.
Any of the options included in the upper layer screen during display
Is selected, it is based on the stored destination data when
Displayed on the bottom layer in response to the selected option.
An FM multiplex broadcast receiver comprising: a second display switching unit that performs switching. 2. The option included in the upper layer screen according to claim 1 , wherein a predetermined number is assigned, and the destination data is a destination corresponding to each of the predetermined numbers in the selection control data. An FM multiplex broadcast receiver characterized by including a page number and, if necessary, a destination program number and a destination service identification.