JP3472418B2 - FM multiplex broadcasting receiver - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for FM multiplex broadcasting for receiving digital data such as program-related information and weather information multiplexed from an FM radio broadcast wave and transmitted from a broadcasting station, and displaying the received digital data. Regarding the receiver.

[0002] In this specification, "program" means
Unless otherwise specified, in order to display digital data that is transmitted by being multiplexed with FM radio broadcasting waves, more specifically, information that is provided to listeners of FM broadcasting, rather than programs that are composed of FM radio broadcasting audio signals. The program is defined as including the character data. Further, the "program" is made up of one page or a plurality of pages, and the "page" means data having a data amount defined by the FM multiplex broadcasting standard.

[0003]

2. Description of the Prior Art In commercial FM radio broadcasting, a frequency band not used for transmitting an audio signal is used to
FM multiplex broadcasting is performed in which digital data such as program-related information, news, and weather forecast are superimposed and transmitted.

In the FM multiplex broadcasting, a lot of information is repeatedly transmitted at a constant cycle, or is transmitted while being updated with new information. The maximum amount of information is 256
It is assumed that the information of one program is 62 pages at maximum and the number of bytes of one page is 4584 bytes at maximum.
Separated into menus, submenus, and content, as shown in. FM capable of receiving such FM multiplex broadcasting
As the receiver for multiplex broadcasting, there are three types of receivers capable of receiving each service level independently based on the broadcast service level as shown in FIG. 7, and a composite receiver capable of receiving a plurality of service levels. Is assumed.

In such an FM multiplex broadcasting receiver, since the information of each program is repeatedly transmitted or updated with a fixed cycle, the information is temporarily stored in the memory and then stored in the memory. It is necessary to perform data processing based on the information and display it on the display device.

In order to store information of all programs in the memory, it is necessary to use a memory having an enormous capacity, and the use of such a large capacity memory causes a cost increase.
Therefore, in the conventional receiver, either of the following two processes is performed. One process is to display a sequential program (interlocked program) that can be directly displayed on the display device without being stored in the memory during normal use, while
This is a processing method in which when a user selects a program, information of all pages of the selected program is fetched and stored in the memory, and when the program selection is canceled, all information of all pages stored in the memory is erased. The other process is to fetch all pages of all the programs in the highest hierarchy (menu) and store them in the memory, and for the programs in the lower hierarchy (submenu), the program by the user. This is a processing method in which all pages are fetched and stored in the memory when selected.

[0007]

However, in the former processing method described above, when the user selects a program, all the pages of the selected program are fetched and stored, so that the program selected immediately after the user selects the program. Sometimes there is no information. During that time, it takes time to store the entire contents of the program because nothing is displayed on the display device or all pages are stored from the state where nothing is stored, and as a result, the program is displayed on the display device. There is a problem that it takes a lot of time to display the contents or all contents, that is, the responsiveness to the user's operation is poor. Further, when the user cancels the program selection, all the information on all pages stored in the memory is erased. Therefore, when the user makes a mistake in key operation, the same information as above is displayed to display the original information. There is also a problem that it takes a lot of time.

Further, in the latter processing method described above, although a smaller capacity memory can be used as compared with the case of storing the contents of all programs, when the number of programs in the highest hierarchy (menu) increases. Since there is a possibility that the capacity of the memory is saturated, it is necessary to use a memory having a relatively large capacity, which causes a problem of cost increase. Further, similar to the former processing method described above, there are problems that the information of the selected program may not exist immediately after the user sets the program, and that it takes time to store the entire contents of the program. is there.

In order to solve the above problems, a technique relating to an FM multiplex broadcasting receiver provided with a memory control means in which a method of storing received program information in a memory is improved by the applicant of the present invention. 7-289690. The outline will be described below.

The first receiver stores information for each program received as FM multiplex broadcasting on a page-by-page basis and in association with each program, and information on each program stored in the memory. While storing N pages respectively, all the pages are stored as information of the selected program stored in the memory when a program is selected. In the first receiver, when the FM multiplex broadcast is received, the memory control unit stores N pages as information of the program received as the FM multiplex broadcast in the memory in association with the received program, while it is stored by the user. When a program is selected, the memory control means stores all pages of the selected program in the memory in association with the received program, so that the contents of the selected program at the time of selecting the program are instantly displayed for N pages. And other pages can be displayed thereafter.

In the second receiver, the memory control means stores up to N pages in ascending order as information of each program. In the second receiver, when the FM multiplex broadcast is received, the memory control means stores N pages in ascending order as information of the program received as the FM multiplex broadcast in the memory in association with the received program. When a program is selected by the user, the memory control means stores all pages of the selected program in the memory in association with the received program, so that the content of the selected program at the time of program selection is instantly, It is possible to display N consecutive pages and subsequently display other pages in sequence.

[0012] In the third receiver, the memory control means may store the program information stored in the memory.
When the information of the page number smaller than the maximum page number of the information is fetched, the information of the small page number is stored instead of the information of the maximum page number, so that the information stored for each program can be stored in ascending N order. Change to page. In the third receiver, when the FM multiplex broadcast is received, the memory control means stores N pages as information of the program received as the FM multiplex broadcast in the memory in association with the received program, and stores the same. When the information of the page number smaller than the maximum page number of the received information is received,
By storing the information of the small page number instead of the information of the maximum page number, the first page to N pages can be stored as the information for each program stored in the memory.

Furthermore, in the fourth receiver, the memory control means, when the free space of the memory becomes less than a predetermined amount, stores M pages smaller than N pages as information stored for each program. Remember. In the fourth receiver,
When the free space of the memory becomes less than or equal to a predetermined amount, the number of pages stored as information for each program in the memory is set to M pages, which is smaller than N pages, so that the information amount of the program selected by the user is large. It is possible to store the information for each program while surely storing the information.

Further, the fifth receiver stores the information of each program received as the FM multiplex broadcast in association with each program, and the received program of the received program based on the index program data received as the FM multiplex broadcast. A determination means for determining whether the display is possible and a memory control means for selecting information to be stored in the memory based on the determination result by the determination means are provided. In the fifth receiver, when the FM multiplex broadcast is received, the determination means determines whether or not each received program can be displayed based on the index program data included in the FM multiplex broadcast, and the determination result is displayed. Based on this, the memory control means stores only the program information corresponding to the program number determined to be capable of displaying the information in the program number storage means in the memory on a page-by-page basis, thereby storing the displayable data in the memory. It is possible to prevent such a situation.

However, even in the proposed receiver, the set number of fetch pages of each program stored in the memory is fixed even if the selected program is changed.
When the total number of pages of all programs stored in the memory exceeds the allowable capacity of the memory, the number of stored pages of information for each program is limited, but this limiter value is controlled only in the direction of decreasing. .

Therefore, when the total number of pages of all programs stored in the memory of the receiver exceeds the allowable capacity of the memory and the number of fetched pages of programs other than the selected program is limited, Even if the selected program is changed by the user and, for example, “the number of pages of the previously selected program >> the number of pages of the newly selected program” and the total number of pages of all programs falls below the allowable memory capacity, The number of imported pages of programs other than the selected program does not increase,
Even though there was room to load the program information into the memory, there was a problem that the program information increased and could not be loaded.To solve this problem, turn off the receiver power once. However, there is a problem in that it is necessary to retrieve the program again from the initial state and the usability is poor.

An object of the present invention is to increase or decrease the limit value (limiter value) of the number of pages to be fetched for each program stored in the memory so that the priority program can be changed by changing the selected program without deteriorating the usability of the user. It is possible to optimize the acquisition and display status of each program by accurately responding to the increase / decrease status of the number of pages or the total page quantity of all programs.
An object of the present invention is to provide a receiver for M multiplex broadcasting.

[0018]

DISCLOSURE OF THE INVENTION The present invention provides an FM multiplex broadcasting receiver for receiving a plurality of types of programs which are multiplexed in an FM broadcast radio wave and repeatedly transmitted in a fixed order from a broadcasting station. A memory for storing the information of each program in a predetermined data unit and corresponding to each program, and a memory control unit for storing the information of each program in the memory in the order of reception. The means, when the free space of the memory is exhausted before storing the information of all the programs transmitted from the broadcasting station, is the data amount N of the program which has acquired the most information at that time.
p is detected, and the data amount (Np-M1) (M1 is a predetermined value) is set as a limiter value NL of the data amount when the program is stored, and the data amount equal to or less than the limiter value is stored as information of each program. An FM multiplex broadcast receiver characterized by controlling the operation of a memory as described above. Further, the present invention is characterized in that the memory control means controls the data in units of pages forming a program. Furthermore, the present invention is characterized in that the memory control means controls data in packet data units that constitute program information.
According to the present invention, when the FM multiplex broadcast is received, the information of each received program is sequentially fetched and stored in the memory in page unit or packet data unit corresponding to each program, while the broadcast station Before the information on all the programs sent from is stored in the memory, that is, when the total data amount of all the programs sent from the broadcasting station exceeds the memory capacity, Detects the data amount Np of the program that captures the most information,
The data amount (Np-M1) (M1 is a predetermined value) is set as a limiter value NL of the data amount when the program is stored, and the data amount equal to or less than the limiter value is stored as information of each program. As a result, the information of all programs transmitted from the broadcasting station is stored at least for the limit value, and the state of fetching the information of each program into the memory can be optimized. Even if you select any program, you can instantly display several pages from the beginning of the program, and when a program for which all information is not stored is selected, the remaining information is stored in memory after selection. It suffices to display them by displaying them, and the responsiveness to the user's operation can be improved.

Further, according to the present invention, the memory control means, when a program is selected by the user, the programs up to a predetermined number K of priority programs are traced back from the latest program selected in the past. Store all information in memory,
Further, a general table of contents program showing all kinds of programs transmitted from the broadcasting station, a submenu program showing a list of submenus forming the program, a sequential program, and a data batch program,
It is characterized in that the operation of the memory is controlled so as to store all information. According to the present invention, when a user selects a program, all the information is stored in the memory up to a predetermined number K of priority programs, which is traced back from the latest program selected in the past. , And a total table of contents program that represents all types of programs being sent from the broadcast station,
All information is also stored in the memory of a submenu program showing a list of submenus constituting the program, a sequential program, and a data batch program. As a result, when the user selects a program, information of all pages can be instantly displayed if the program has been selected within the past K times, and at least Np pages of information can be displayed even if the program has not been selected. The information can be displayed instantly, and then the remaining information can be stored in the memory and another page can be displayed to improve the responsiveness to the user's program selection operation. In addition, since all information is stored in the memory even for the total table of contents program, submenu program, sequential program, and data batch program, even when these programs are selected, the information of all pages can be displayed instantly. Because it can, the usability is improved.

Further, in the present invention, the memory control means is
Even if the limiter value control is performed, when the free space of the memory is exhausted before the information of all the programs transmitted from the broadcasting station is stored, the limiter is stored until the information of all the programs can be stored. The value is (NL- (M1 × n))
It is characterized in that the program information is stored in the memory while being gradually decreased until (n = 2, 3, 4, ...) And finally reaches a predetermined limiter minimum value NB. According to the present invention, even if the limiter value, which is the maximum information storage amount of a program, is reduced to (Np-M1) and stored, the information of all the programs transmitted from the broadcasting station is stored in the memory before being stored. When the free space is used up, the limiter value is decreased by M1 pages until the final limiter minimum value NB is finally reached and the information is stored, and the information of all programs is stored. This makes it possible to optimize the information acquisition state and display state of each program at that time.

Still further, according to the present invention, the memory control means can store the information of all the programs until the type of K priority programs is changed by the user's selection of the programs. Set the limiter value to (NL + (M2 ×
m)) (m = 1, 2, 3, ...) While increasing and changing, the memory is controlled so as to store the program information. According to the present invention, each time the type of K priority programs changes as the user selects a program,
Until the information of all programs can be stored, the limiter value is set to (NL + (M2 × m)) (m = 1, 2, 3,
...), the program information is stored in the memory while changing upward. This makes it possible to optimize the information acquisition state and display state of each program at that time.

Further, according to the present invention, the memory control means, even if the limiter value control is performed, when the free space of the memory is exhausted before the information of all programs transmitted from the broadcasting station is stored, It is characterized in that the memory is controlled so as to store the program information while decreasing the priority program number K by 1 until it finally becomes 1 until the information of all the programs can be stored. According to the present invention, even if the limiter value control is performed, the information of all programs can be stored when the free space of the memory is exhausted before the information of all programs transmitted from the broadcasting station is stored. Until this happens, the program information is stored in the memory while decreasing the priority program number K by 1 until it finally becomes 1. This makes it possible to optimize the information acquisition state and display state of each program at that time.

Further, in the present invention, the memory control means is
Even if the limiter value control is performed, when the free space of the memory is exhausted before the information of all the programs transmitted from the broadcasting station is stored, the latest priority selected program, the total table of contents program, The program is characterized in that the programs and the other programs are temporarily erased, and the memory is controlled so that the information of each program is newly stored for each data amount N (N <Np). According to the present invention, even if the limiter value control is performed, when the free space of the memory is exhausted before the information of all programs transmitted from the broadcasting station is stored, one latest priority selected program, The information of the programs other than the total table of contents program and the sequential programs is temporarily erased, and the information of each program is newly stored in the memory for each data amount N (N <Np). This makes it possible to optimize the information acquisition state and display state of each program at that time.

Furthermore, the present invention is characterized in that the memory control means controls the amount of change in the limiter value control as M1 ≠ M2. According to the present invention, by setting the change amount in the limiter value control to be M1 ≠ M2, the limiter value (NL− (M1 ×
n)) and the limiter value (NL + (M2 ×
Since m)) takes different values, it is possible to find the optimum limiter value for controlling the acquisition state of each program.

[0025]

1 is a schematic functional block diagram showing an electrical configuration of an FM multiplex broadcasting receiver (hereinafter, also simply referred to as "receiver") which is an embodiment of the present invention. is there. The antenna 1 is realized by a diversity antenna, for example, and receives FM broadcast radio waves. The FM tuner 2 receives an FM broadcast via the antenna 1, FM-detects the received signal, and outputs a composite signal. F
The M multiplex decoder 3 demodulates the multiplex digital data of the FM broadcast received by the FM tuner 2, and then performs PN decoding and error detection / correction. Key input section 4
Performs program selection and page selection. The display unit 5 is
For example, it is composed of a liquid crystal display, and displays various operating conditions of the receiver, information on the program selected by the key input unit 4, and the like. The memory 6 stores the completed program. The control unit 7 performs system control of the entire receiver, program creation control based on the data output from the FM multiplex decoder 3, transfer control of the created program to the display unit 5 or the memory 6, and the like.

With respect to the FM multiplex broadcasting receiver configured as described above, the program information storage control operation will be described.

FIG. 2 is a flow chart for explaining the first storage control operation. When the FM multiplex broadcast is received by the FM tuner 2 via the antenna 1 in step a1, the multiplex digital data included in the FM multiplex broadcast is demodulated by the FM multiplex decoder 3 and PN decoded, in step a2. Then, error detection / correction is performed, and in step a3, the control unit 7 creates a program based on the signal-processed data. The data is transmitted from the broadcast station in packet data units, and one page of data is composed of a plurality of packet data. Although the following description describes data processing in page units, data processing may be performed in packet data units.

The packet data is composed of 288 bits, and more specifically, 16-bit bic (block identification code) data, 32-bit prefix data, and 14-bit prefix data.
It consists of a 4-bit data block, a 14-bit CRC (Cyclic Redundancy Check) code, and 82-bit parity data. Out of packet data
The prefix data, the data block, and the 190-bit data of the CRC code are used to create the program (page). The prefix data includes 4-bit service identification data, 1-bit decoded identification data, 1-bit information end flag, 2-bit update flag, 8-bit program number data, and 8-bit page number data. , Link code data and 6-bit packet number data. Using the prefix data, page and program creation processing based on the received digital data is performed. As for the data of one page, a plurality of packet data having the same program number data and page number data are connected in the order of packet number data (increment order from 0 to 1), and the information end flag is 1 bit (information End) indicating packet data. The data of one program is composed of a plurality of page data chunks having the same program number data.

At step a4, the control section 7 controls the memory 6
The total number of pages of information (pages) stored in the area corresponding to the program number of the created program is read, and the total number of pages is the allowable capacity L pages of the memory 6 (for example, 300 pages). To determine if it is over. When it is determined that the number of pages is less than L, the process proceeds to step a12, and the control unit 7 controls the memory 6 to store the information of the created program in the area corresponding to the program number. When it is determined that the number of pages exceeds L pages, the process proceeds to step a5, and the control unit 7 detects the number of pages Np pages (for example, 62 pages) of the program that has loaded the most pages at that time, The limiter value NL of each program is set as NL = Np-M1 (for example, M1 = 4 pages), and in step a6, the control unit 7 sets the number of priority-selected programs K
(For example, 3 programs) are set.

Then, in step a7, the control section 7
It is determined whether the page number of the created program information exceeds the limiter value NL page. If there is a program whose page number is equal to or greater than the limiter value NL pages, step a
8, the control unit 7 controls the memory 6 to store the NL stored in the area corresponding to the program number of the created program.
Erases information for page numbers above the page. However, the above-mentioned priority selected programs (here, 3 programs), and the general table of contents,
Submenus, sequential programs, and data batch programs are excluded from the limiter restriction target, and information for all pages is stored.

In step a9, it is again determined whether the total number of pages exceeds the allowable capacity L pages of the memory 6, and if it is determined that the total number of pages is less than L pages, the process proceeds to step a12, and the control unit 7 stores the memory. The information of the program created by controlling 6 is stored in the area corresponding to the program number. If it is determined that the number of pages is L pages or more, step a
In step 10, it is determined whether the limiter value NL is equal to the lower limit set value NB (for example, 6 pages). If not, the process proceeds to step a11, in which the control section 7 subtracts M1 pages from the limiter value NL at that time. And then step a7
Then, the total number of pages is again the allowable capacity L of the memory 6.
To determine if it is over. That is, step a1
The processes of 1, a7, a8, and a9 are repeated until the limiter value NL reaches the lower limit set value NB.

FIG. 3 is a flow chart for explaining the second storage control operation. In step b1, when the user changes the contents of the K selected programs most recently selected by the program selection, in step b2, the control unit 7 sets the limiter value NL at that time to M2 pages (for example, 6 pages). (Page) to increase the limiter value. Subsequently, in step b3, the control unit 7 determines whether the page number of the created program information exceeds the limiter value NL page. When there is a program whose page number is equal to or more than the limiter value NL page, the process proceeds to step b4, where the control unit 7 controls the memory 6 to store the NL stored in the area corresponding to the program number of the created program. Erases information for page numbers above the page. However, the priority selected programs (three programs in this case), the total table of contents, the sub menu, the sequential programs, and the data batch programs are excluded from the limiter restriction target, and information for all pages is stored.

In step b5, it is again determined whether the total number of pages exceeds the allowable capacity L pages of the memory 6, and if it is determined that the total number of pages is less than L pages, the process proceeds to step b9 and the control unit 7 stores the memory. The information of the program created by controlling 6 is stored in the area corresponding to the program number.
If it is determined that the number of pages is L pages or more, the process proceeds to step b6, and the limiter value NL is set to the lower limit set value NB (for example, 6).
Page), and if not, the process proceeds to step b7, where the control unit 7 subtracts M1 pages from the limiter value NL at that time, and then proceeds to step b8 to check whether the program is selected. to decide. If no program is selected, the process returns to step b3 to repeat the process.
When the program is selected, the process returns to step b2 and the process is repeated.

FIG. 4 is a flow chart for explaining the third storage control operation. As described in FIG. 3, even if the lower limit setting value NB is set in the limiter control of the information storage amount of each program, the total number of pages of all programs is the allowable capacity L of the memory.
When exceeding the page (step c1), step c2
Then, the control unit 7 decrements the number of preferentially selected programs K by 1, and at step c3, the control unit 7 determines whether the page number of the information of the created program exceeds the limiter value NL page. When there is a program whose page number is equal to or more than the limiter value NL page, the process proceeds to step c4, and the control unit 7 controls the memory 6 to store the NL stored in the area corresponding to the program number of the created program. Erases information for page numbers above the page. If not, go to step c5.

In step c5, it is determined whether the total number of pages exceeds the allowable capacity L pages of the memory 6, and if it is determined that the total number of pages is less than L pages, step c
In step 10, the control unit 7 controls the memory 6 to store the program information created in the area corresponding to the program number. L
If it is determined that the number of pages is equal to or more than the page, the process proceeds to step c6, and it is determined whether the priority-selected program count K is one.
If K is not 1, the process returns to step c2 and is repeated. If K is 1, the process proceeds to step c7.

If the total number of pages of all programs exceeds the permissible capacity L pages of the memory 6 even after the above control processing is performed, in step c7, the control section 7 causes the priority selection program other than 1 program, total table of contents, and sequential programs to be excluded. Of the program information is deleted, and the limiter value of each program is newly set to N pages (for example, 31 pages).

At step c8, if there is a program whose page number is equal to or greater than the limiter value N pages, the control unit 7
Controls the memory 6 to erase the information of the page numbers of N pages or more stored in the area corresponding to the program number of the created program. Then, in step c10, the control unit 7 controls the memory 6 to store the information of the created program in the area corresponding to the program number.

As described above, according to the above control operation,
As shown in FIG. 5, when the total number of pages of all programs does not reach the allowable capacity L pages of the memory 6, information for all pages is stored as information corresponding to each program. When the capacity L pages are reached, the information corresponding to each program other than the priority program is displayed (Np-M1).
Pages, or (NL- (M1 × n)) pages,
Alternatively, (NL + (M2 × m)) pages of information can be stored, and when the user selects a program using the key input unit 4 and the content of the last selection K changes, the last selection K Since the limiter value of the information storage amount of each program can be changed by increasing or decreasing the page number of the program information, it is possible to optimize the fetching and display state of each program information at that time.

Further, in the above control operation, when the limit value for the pages stored in each program is lowered (NL- (M
1 × n)) pages, (NL + (M2 × m)) pages when rising, and M1 ≠ M2 are set. Therefore, as shown in FIG. 5, different limiters are used when changing downward and when changing rising. Since the value can be taken, it is possible to find the optimum limiter value for controlling the storage amount of the information of each program in the memory 6.

[0040]

As described above, according to the present invention, K programs, total table of contents programs, sub-menu programs, sequential programs, and data batch programs are traced back from the latest program selected by the user. By storing all pages, and for other programs, program information includes Np pages, (Np-M1) pages, or (NL- (M1
Xn)) By storing pages, the contents of the selected program can be displayed instantaneously when the user selects a program, so that the responsiveness to the program selection operation by the user is good and the allowable memory capacity is large. While checking the margin to the program information, the limiter value of the storage amount of the program information is set to Np page → (Np-M1) → (NL- (M1
Xn)) pages are sequentially changed downward so as to correspond to the capturing states of the respective programs, so that the necessary program information can be surely stored even in a memory having a relatively small capacity, and the program information which is convenient for the user can be stored. A display mode can be realized.

Further, according to the present invention, each time the user performs a program selection operation and the latest priority program type changes, the limiter value of the storage amount of program information is increased by M2 pages to change the priority program. Since the control to increase / decrease the storage amount of each program information according to the change of the number of pages of each program can be performed, the loading and display state of each program at that time can be optimized, and the usability for the user can be improved. it can.

Further, according to the present invention, when all the programs transmitted from the broadcasting station cannot be stored in the memory even if the above memory control is performed, the priority program number is finally set to 1. The number of programs for storing information for all pages is reduced by decreasing the number of each program up to 1, and the information for each program can be stored. Therefore, the information acquisition and display status of each program at that time Can be optimized and deterioration of responsiveness to a user operation at that time can be surely prevented.

Furthermore, according to the present invention, when all the programs transmitted from the broadcasting station cannot be stored in the memory even if the above memory control is performed, one currently selected program, a total table of contents program, By sequentially erasing all the information of the programs other than the remaining programs and newly storing N pages (N <Np) as program information for each program, the information of each program at that time can be stored. The capture and display states can be optimized, and the responsiveness to the user operation at that time can be reliably prevented from deteriorating.

Further, according to the present invention, in the limiter value control of the storage amount of the information of each program, the optimum limiter value can be found by selecting different amounts of change for the rising change and the falling change. Yes, you can optimize the information acquisition and display status of each program at that time,
The usability for the user can be improved.

[Brief description of drawings]

FIG. 1 is a schematic functional block diagram showing an electrical configuration of an FM multiplex broadcast receiver that is an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a first storage control operation.

FIG. 3 is a flowchart illustrating a second storage control operation.

FIG. 4 is a flowchart illustrating a third storage control operation.

FIG. 5 is a time chart showing a state transition of a limiter operation.

FIG. 6 is an FM receivable by a receiver for FM multiplex broadcasting.
It is a figure which shows the program structural example of multiplex broadcasting.

FIG. 7 is a diagram showing service levels of FM multiplex broadcasting.

[Explanation of symbols]

1 antenna 2 FM tuner 3 FM multiplex decoder 4 Key input section 5 Display 6 memory 7 control unit

Continuation of front page (56) Reference JP-A-1-296717 (JP, A) JP-A-7-303054 (JP, A) JP-A-9-93146 (JP, A) JP-A-4-227127 (JP , A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04B 1/16 H04H 1/00 H04L 7/08

Claims (9)

(57) [Claims] 1. An FM multiplex broadcast receiver that receives a plurality of types of programs that are multiplexed in an FM broadcast wave and repeatedly transmitted in a fixed order from a broadcast station, and information of each program of the FM multiplex broadcast is determined in advance. The memory control unit includes a memory for storing data in units of data and corresponding to each program, and a memory control unit for storing the information of each program in the memory in the order in which they are received. When the free space of the memory is exhausted before the information of all the programs to be stored is stored, the data amount Np of the program that has acquired the most information at that time is detected, and the data amount (Np-M
1) (M1 is a predetermined value) is set as a limiter value NL of a data amount when a program is stored, and a memory is controlled so as to store a data amount equal to or less than the limiter value as information of each program. FM multiplex broadcasting receiver. 2. The memory control means, when a program is selected by the user, all information up to a predetermined number K of priority programs traced back from the latest program selected in the past. Is stored in the memory, and in addition, a general table of contents program that shows all types of programs sent from the broadcasting station, a submenu program that shows a list of submenus that make up the program, a sequential program, and a data batch program. The receiver for FM multiplex broadcasting according to claim 1, wherein the operation of the memory is controlled so as to store information. 3. The memory control means, even if the limiter value control is performed, if the free space of the memory is exhausted before the information of all the programs transmitted from the broadcasting station is stored, all the programs are stored. Until you can remember the information
The limiter value is (NL- (M1 × n)) (n = 2, 3,
4, ...) as a final predetermined limiter minimum value NB
3. The memory is controlled so as to store the information of the program while gradually decreasing until it becomes.
The receiver for FM multiplex broadcasting according to 1. 4. The memory control means can store the information of all programs every time the type of K priority programs changes by the user selecting a program,
The limiter value is (NL + (M2 × m)) (m = 1,
The receiver for FM multiplex broadcasting according to claim 3, wherein the memory is controlled so as to store the program information while increasing and changing as 2, 3 ,. 5. The memory control means, even if the limiter value control is performed, if the free space of the memory is exhausted before the information of all the programs transmitted from the broadcasting station is stored, all the programs are stored. Until you can remember the information
5. The receiver for FM multiplex broadcasting according to claim 4, wherein the memory is controlled so as to store the program information while decreasing the priority program number K by one until it finally becomes one. 6. The memory control means, even if the limiter value control is performed, if the free space of the memory runs out before the information of all programs transmitted from the broadcasting station is stored, the latest priority is given. The memory is controlled so that one selected program, a total table of contents program, and a sequential program are left and the information of other programs is once erased, and information of each program is newly stored for each data amount N (N <Np). The receiver for FM multiplex broadcast according to claim 5. 7. The receiver for FM multiplex broadcasting according to claim 4, wherein the memory control means controls the amount of change in the limiter value control as M1 ≠ M2. 8. The receiver for FM multiplex broadcasting according to claim 1, wherein the memory control means controls data on a page-by-page basis forming a program. 9. The receiver for FM multiplex broadcasting according to claim 1, wherein the memory control means controls data in packet data units that constitute program information.