JPH1098401A - Fm multiplex receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an FM multiplex receiver that displays teletext information without causing a high cost with high convenience having provision for an overflow state. SOLUTION: When the user selects a desired program from hierarchical programs such as main menu programs 101-103 and sub menu programs 201-203, a data capacity for teletext information signals relating to the selected program and an idle capacity of areas of a storage means provided to store data are compared. In the case of discrimination of an overflow state when the former is larger than the latter, overflow indications 401, 402 are displayed with/without an alarm tone. The overflow indications 401, 402 are properly displayed before a page 301 is displayed or on the way of displaying any of pages 301-320.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FM multiplex receiver for displaying character information.

[0002]

2. Description of the Related Art At the time of program broadcasting of a general FM broadcasting station, character information signals of a program (complementary program) related to the program contents and a program (independent program) not related to the program contents are used by using a gap between FM broadcasting waves. F to multiplex and transmit
FM multiplex receivers that receive M multiplex broadcasts and display the character information on a display unit such as a liquid crystal display have been put into practical use (for example, see Japanese Patent Application Laid-Open No. 8-79206).

The structure of the program in FM multiplex broadcasting is as follows:
It has a tree structure, and the specific contents of each program indicated by the submenu are described as character information below the upper hierarchical program such as the main menu program and the submenu program classified by type in this main menu program. A plurality of pages to be displayed are continued, and each page is composed of a header sentence and a main body, and the main body is composed of 15 characters and two lines are displayed as one page at a time, and a total of 30 characters are displayed at a time. If there is a page, the screen is scrolled to display the next or previous page. That is, when a desired program is selected in a higher hierarchical program such as a main menu program and a submenu program,
At that time, the storage means starts to store the data of the character information signal relating to the selected program, and when the data is stored in units of pages, display on the display unit in units of pages is possible thereafter.

[0004]

In FM multiplex receivers, it is not unusual for one program to be composed of several tens of pages (sometimes several hundreds of pages). (For example, a 1-megabyte static RAM) has a fixed area capacity, so that the data capacity of the character information signal relating to the selected program and the free area capacity of the storage means provided for storing the data are determined. , A so-called overflow state may be caused in which the former is larger than the latter.

[0005] In the case of such an overflow state, even if all the data are not accumulated, the display on the display unit becomes possible when the accumulation of the data in page units is completed. Therefore, the user does not know this overflow state, and despite the fact that there is an undisplayed page that is not actually received, the data relating to the selected program is displayed without omission due to the end of the already displayed page. There was a problem that it was judged that it was done.

[0006] Such a problem can be solved by preparing the capacity of the storage means large enough, but it is costly to provide an excessive capacity storage means in rare cases. Inviting high and not the best policy.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an FM multiplex receiver capable of coping with an overflow state and displaying highly convenient character information without increasing the cost.

[0008]

SUMMARY OF THE INVENTION The present invention relates to an FM multiplex receiver which receives an FM multiplex broadcast for multiplexing and transmitting a text information signal by using a gap between FM broadcast waves and displays text information. Comparing the data capacity of the character information signal pertaining to the selected program with the free space capacity of the storage means provided for storing the data, and when the former is in an overflow state larger than the latter, , To notify the user of the overflow state.

Further, the present invention secures the free space capacity of the storage means by erasing all or part of the already stored data automatically or by a user's selection operation in the overflow state. is there.

Further, the present invention is characterized in that, in the overflow state, when all or a part of already stored data is erased automatically or by a user's selection operation to secure the free space capacity of the storage means, After the data to be deleted is displayed, the data is deleted by a user operation.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS At the same time as reception starts, the microcomputer 5 determines the data capacity of the character information signal of the selected program,
The capacity of the RAM 54 provided for storing data is compared with the free space capacity. If it is determined that the former is in an overflow state larger than the latter, overflow displays 401 and 402 are displayed on the display unit 8. By doing
By confirming the overflow displays 401 and 402, the user can take necessary measures upon recognizing undisplayed data.

Further, in the overflow state, all or a part of the already stored data is erased automatically or by a user's selection operation to secure the free space capacity of the RAM 54, so that the storage means having an excessive capacity is stored. , It is possible to display data relating to the selected program without omission.

In the overflow state, when the whole or a part of the already stored data is erased automatically or by the user's selection operation to secure the free space capacity of the RAM 54, the data to be erased is displayed. The data is erased by a user's operation, and an appropriate action can be selected according to the content of the data and the current state.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the accompanying drawings.

FIG. 1 shows a frame structure of a digital signal multiplexed on an FM broadcast signal of FM multiplex broadcasting.
One frame is composed of 272 blocks, and at the beginning of each block, one frame is used for reproduction of frame synchronization or block synchronization.
A 6-bit BIC (Block Identification Code) is added. Of the 272 blocks, 190 blocks are data transmission packets for transmitting data, and 82 blocks are parity packets for transmitting parity in the column direction. , BIC, followed by a 176-bit data packet and a 14-bit CRC (Cyclic R).
edundancy code) and an 82-bit parity.

FIG. 2 shows a configuration of an FM multiplex receiver for receiving the FM multiplex broadcast in which the digital signal of FIG. 1 is multiplexed. 1 is an antenna for receiving the FM multiplex broadcast, and 2 is a reception connected to the antenna 1. The circuit 3 is a detection circuit connected to the reception circuit 2, and the reference numeral 4 is a decoding circuit connected to the detection circuit 3. The decoding circuit 4 demodulates the digital signal having the frame configuration shown in FIG. The demodulated digital signal is synchronously reproduced in accordance with the BIC by an error correction circuit 6 with synchronous reproduction controlled by a microcomputer (microcomputer) 5 and error-corrected in accordance with a parity code. In the microcomputer 5,
Core CPU 51, RO storing programs
M52, a ROM 53 for storing character fonts, and a RAM 54 as storage means for temporarily writing digital signals (data) given to the microcomputer 5;
Is processed by a program stored in the ROM 52 based on the operation of the operation unit 7, and the resulting character information is displayed on the display unit 8. Operation unit 7
Has a power key 71, a channel selection key 72, an up key 73, a down key 74 for moving between lines and between layers of the text, a front key 75, a rear key 76, and a selection key 77 for page scrolling. The unit 8 uses a dot matrix type liquid crystal display element and has a header text area 81 at the top and a text area 82 under the header text.
0 characters and the text are displayed at a time as 30 pages of 15 characters x 2 lines, equivalent to full-width characters, as one page.

In the embodiment of the present invention for providing an FM multiplex receiver for displaying highly convenient character information, FIG.
As shown by, when the user selects a desired program from upper-layer programs such as the main menu programs 101 to 103 and the submenu programs 201 to 203, the receiving circuit 2
When the data of the character information signal relating to the selected program is started to be stored in the RAM 54 via the..., And the data is stored in page units, the display unit 8 can display the data in page units.

At this time, at the same time as the start of the reception, the CPU 51 determines the data capacity of the character information signal relating to the selected program included in the data and the free space capacity of the RAM 54 prepared for storing the data. And if it is determined that the former is in an overflow state larger than the latter, an overflow display 401 or 402 is displayed on the display unit 8 together with a warning sound or independently. The overflow displays 401 and 402 are appropriately displayed before the display of the page 301 or during the display of any one of the pages 301 to 320. It serves to warn in advance that data will not be completely stored. Then, the user displays the overflow displays 401 and 402.
, It is possible to take necessary measures based on recognition of undisplayed data.

Here, necessary measures include a case where the overflow state is ignored and data that cannot be stored in the RAM 54 is discarded, and a case where the remaining data of the character information signal relating to the program selected by some method is stored. These selections are made automatically by the user in advance by the setting of the program or by a selection operation on the operation unit 7 by the user.

When the latter is selected (when the remaining data is stored), all or one of the already stored data is automatically selected by the setting of the program or selected by the user using the operation unit 7. The remaining data is accumulated and displayed by erasing the portion and securing the free space capacity of the RAM 54. Here, automatically deleting means, for example, calculating the free space capacity corresponding to the accumulation of the remaining data and deleting the data from the oldest reception time, and the like, and according to the user's selection operation, After calculating the free space capacity corresponding to the accumulation of the remaining data and displaying the data with the oldest reception time accumulated in the RAM 54 as data to be deleted,
By erasing by the user's confirmation operation, depending on the content of the page (data) to be erased, a different page (data) may be replaced as erasing, or the content of the already displayed page (data) may be replaced with the remaining un- This is to select an appropriate action according to the current state, such as not storing the displayed page (data) as unnecessary. Of course, in both the automatic and user selection operations, the RAM 5
It is also possible to delete all data stored in step 4.

As described above, according to the present invention, the user:
Since an appropriate action can be selected by recognizing the overflow state, it is sufficient to change only the program of the microcomputer 5 and the convenience is improved without increasing the cost. And it goes without saying that the treatment is not limited to the treatment shown in the above-described embodiment, and various treatments can be selected within the scope of the object of the present invention.

[0022]

According to the present invention, there is provided an FM multiplex receiver for receiving an FM multiplex broadcast for multiplexing and transmitting a text information signal by utilizing a gap between FM broadcast waves and displaying the text information, wherein the selected program is selected. Comparing the data capacity of the character information signal with the free space capacity of the storage means provided for storing the data, and when the former is in an overflow state larger than the latter, the overflow state is determined. Is notified to the user, and the display of the program is not terminated without recognizing undisplayed data, thereby improving the convenience.

In the overflow state,
Automatically or by a user's selection operation, the whole or a part of the already stored data is erased to secure the free space capacity of the storage means, without increasing the cost.
Data relating to the selected program can be displayed without omission, and convenience is improved.

In the overflow state,
Automatically or by a user's selection operation, when erasing all or a part of the already stored data to secure the free space capacity of the storage means, displaying the data to be erased, and then erasing by the user's operation This makes it possible to select an appropriate treatment according to the content of the data and the current state, thereby improving the convenience.

[Brief description of the drawings]

FIG. 1 is a diagram showing a frame configuration of a digital signal of an FM broadcast signal.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a display example of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Receiving circuit 3 Detection circuit 4 Decoding circuit 5 Microcomputer 6 Error correction circuit 7 Operation unit 8 Display unit 101 to 103 Main menu program 201 to 203 Sub menu program 301 to 320 Page 401, 402 Overflow display

Claims (3)

[Claims] An FM multiplex receiver for receiving an FM multiplex broadcast for multiplexing and transmitting a text information signal by using a gap between FM broadcast waves and displaying text information, wherein the text related to a selected program is provided. The data capacity of the information signal is compared with the free space capacity of the storage means provided for storing the data, and if the former is in an overflow state larger than the latter, the overflow state is sent to the user. An FM multiplex receiver for notifying. 2. In the overflow state, all or a part of already stored data is erased automatically or by a user's selection operation to secure the free space capacity of the storage means. Item 3. An FM multiplex receiver according to Item 1. 3. In the overflow state, when erasing all or part of already stored data to secure the free space capacity of the storage means by automatic or user's selection operation, the data to be erased is deleted. 3. The FM multiplex receiver according to claim 2, wherein the display is deleted by a user operation after the display.