JPH10126285A - Fm multiplex broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the FM multiplex broadcast receiver by which an emergency program is surely received and displayed under any circumstance. SOLUTION: On the reception of an emergency program, the emergency program is stored in a memory 7, displayed on a display section 5 and whether or not the emergency program is included in a retrieved program is checked for retrieval check. When the emergency program is received, an update flag is compared between the emergency program having already been stored and the emergency program received newly, and when unmatching, the new emergency program is stored in the memory 7 and displayed on the display section 5. When the emergency program is not included in the retrieved program in the retrieval check, the emergency program is deleted from the memory 7.

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 for receiving digital data such as program-related information and weather information multiplexed on an FM radio broadcast wave and transmitted from a broadcast station, and displaying the received digital data. Regarding the receiver.

[0002] In this specification, "program" means
Unless otherwise specified, digital data that is not multiplexed with FM radio broadcast audio signals but is multiplexed and transmitted with FM radio broadcast radio waves, more specifically for displaying information provided to FM broadcast listeners Is a program configured to include the character data. The “program” is composed of one page or a plurality of pages, and the “page” refers to data having a data amount specified in advance by the FM multiplex broadcasting standard.

[0003]

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

As an FM multiplex broadcast program, there is an emergency program for transmitting emergency information when an emergency such as an earthquake or a natural disaster occurs, in addition to the above-mentioned normal program. This emergency program is generally a program consisting of a plurality of pages, and is transmitted from a broadcasting station with a program number 255. Upon receiving the emergency program, the receiver switches immediately to the emergency program regardless of which program is being displayed, or a buzzer to notify the listener of the radio broadcast that the emergency program is being received. Sounds.

[0005] Normally, when a broadcast station transmits a program, the same data is repeatedly transmitted many times so that a receiver can surely receive all the information of the program. Is changed and the data is transmitted. The prefix is data in packet data defined by the FM multiplex broadcasting standard. The receiver is
When a listener instructs to receive a program, a plurality of programs multiplexed and transmitted on the currently received FM broadcast wave are sequentially received and stored in a memory, and a program designated by the listener is displayed. Display in the section. When the update flag is changed, the program is received again and stored in the memory.

[0006] At the start of broadcasting, the broadcasting station returns the update flag to 0, and then transmits the program. The update flag is
There are only four patterns of 0, 1, 2, and 3, and these four patterns are repeated. Here, since the emergency program is often information on an earthquake, a natural disaster, or the like, the cycle for changing the contents of the program is long, that is, the cycle for changing the update flag is long, and the update flag on the broadcast station side is accurate. Increment control is difficult. This is because the update flag is reset to 0 each time the broadcast station turns off the power of the transmitter after the broadcast ends or performs initialization or the like at the time of maintenance of the transmitter or the like. For this reason, the update flag is not always continuous with the update flag used when the previous emergency program was transmitted. Therefore, even if the update flag is the same, a program having different contents may be transmitted. That is, the broadcast station stores the update flag of the emergency program transmitted before (sometimes several months ago) and increments the stored update flag when the next emergency program is transmitted. Did not go. For this reason, when the receiver stores the previously received emergency program (update flag), the emergency program may not be received when the update flag coincides by chance.

There are various types of program receiving modes of the receiver. In the mode of receiving and displaying the same data every time the program is retransmitted, the same data is displayed again at the retransmission interval of the program. Therefore, there is an inconvenience that the screen flickers, and if the user is watching another desired program after watching the emergency program, the emergency program having the same content is displayed repeatedly and repeatedly each time retransmission is performed. This makes it difficult to view a desired program. Therefore, data is received and displayed only when the update flag is changed and the content of the program is changed.

[0008] In addition, in the case of darkness due to a power failure or the like, there is a disadvantage that the emergency program cannot be immediately watched even when the emergency program is received.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide an FM multiplex broadcast receiver capable of reliably receiving and displaying an emergency program in any situation.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a plurality of types of programs multiplexed on FM broadcast waves and repeatedly transmitted in a predetermined order from a broadcasting station.
One is an index program indicating the type of all programs currently multiplexed on the FM broadcast wave, and includes an emergency program in an emergency such as a disaster, and the content of the program is changed in each program. An FM multiplex broadcast receiver that receives such a program, which includes an update flag indicating that
Receiving means for receiving broadcast waves, decoding means for decoding a multiplexed program from a received signal provided from the receiving means, storage means for storing the received program,
Display means for displaying a program, selection means for selecting a program to be displayed from a plurality of types of programs, and programs provided from the decoding means are sequentially stored in the storage means, and the program selected by the selection means When the memory of is completed,
Control means for reading the program from the storage means and displaying the program on the display means, wherein when the emergency program is received, the control means stores the emergency program in the storage means, and the display means , After starting an index search to check whether or not an emergency program is included in the index program, and then, when an emergency program is received, an already stored emergency program and a newly received emergency program The update flags are compared with the emergency program, and if they do not match, a new emergency program is stored in the storage means and displayed on the display means, and the emergency program finds an emergency program in the index program during the index search. An FM multiplex broadcasting receiver characterized by deleting an emergency program from the storage means when it is detected that it is not included. According to the present invention, a plurality of types of programs transmitted from a broadcasting station are sequentially received and stored in the storage means. The user selects a desired program from a plurality of programs currently received from the table of contents program. The selected program is
The data is read from the storage means and displayed on the display means. If the selected program is not stored in the storage means, the program is displayed on the display means after the storage of the program is completed. When an emergency program is received, it is necessary to immediately notify the user of the information on the emergency program, so that the received emergency program is stored in the storage means and displayed even when another program is displayed. Immediately displayed on the means. Also, an index search for checking whether or not an emergency program is included in the index program is started. This index search is performed to determine whether the emergency program received first and the emergency program received thereafter are programs of the same series. The same series of emergency programs refers to programs related to one emergency that has occurred. For example, in the event of an earthquake, the first emergency program will tell you that the earthquake has occurred for the time being, and the subsequent emergency programs will give detailed information, such as seismic intensity and tsunami information for each region. Is a program related to one particular emergency, and such a program is a program of the same series. Programs of the same series are continuously transmitted from the broadcasting station, and when the content is changed, the update flag is changed and transmitted. Also, during the period in which emergency programs of the same series are transmitted, the index programs always include emergency programs. Therefore,
After receiving the emergency program for the first time, the receiver compares the update flags each time the emergency program is received, and if they match, the programs have the same contents. Is not displayed, and if they do not match, the program has different contents, so that the program is stored in the storage means and displayed on the display means. This ensures that emergency programs can be received and displayed, and that emergency programs are displayed only when the content is changed, so that emergency programs with the same content are displayed repeatedly, like a conventional receiver. Thus, there is no inconvenience in viewing other programs. The above-described index search is continuously performed during the period when the emergency program is being received, and when the emergency program is no longer detected in the index program, the emergency program is deleted from the storage unit. By this, when an emergency program of a different series from the previously received emergency program, that is, an emergency program related to another emergency situation is newly received, the previous emergency program does not remain in the storage means. Thus, a new emergency program can be reliably stored and displayed in the storage means. In a conventional receiver,
Since the previously received emergency program may be left in the storage means as it is, even if different emergency programs are coincident with the update flag, it is determined that the same program is the same program, and stored in the storage means. Is not performed, and there is a possibility that the user is not notified of the information. However, such a disadvantage is solved by the receiver of the present invention.

Further, the present invention further comprises a warning sound generating means for generating a warning sound for notifying the user that the emergency broadcast has been received, wherein the control means is adapted to display the emergency program on the display means. And driving the warning sound generating means. According to the present invention, when an emergency program is received and displayed on the display means, a warning sound is generated at the same time. Therefore, the user can surely view the emergency program.

Further, according to the present invention, the display means includes a light source for supplying light necessary for display, and the control means turns on or off the light source when displaying an emergency program on the display means. Features. According to the present invention, when the emergency program is received and displayed on the display, the light source of the display is turned on or off. Therefore, the user can surely view the emergency program.

Still further, the present invention further includes a power supply means for supplying power required for operation from a battery or a commercial AC power supply, wherein the control means is configured to supply power when the power supply means is supplying power from the battery. After turning on or blinking the light source, the light source is turned off after a certain period of time. According to the present invention, when the emergency program is received and displayed on the display unit, and the light source included in the display unit is turned on or blinked to notify the user of the emergency program, the power of the receiver is supplied by the battery. In some cases, the light source is turned off after a certain period of time. As a result, unnecessary power consumption can be reduced.

Further, according to the present invention, when the emergency means receives an emergency program, if the storage means has no free space, the control means erases another program already stored and stores the emergency program. Features. According to the present invention, even when the storage means has no free space, if an emergency program is received, other programs are deleted and the emergency program is stored. Thereby, the emergency program can be reliably received.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a schematic configuration of an FM multiplex broadcasting receiver (hereinafter sometimes simply referred to as a "receiver") according to an embodiment of the present invention.
Antenna 1 is realized by, for example, a diversity antenna, receives FM multiplex broadcasting, and supplies a received signal to FM tuner 2. The FM tuner 2 performs FM detection on a reception signal received via the antenna 1 and supplies a composite signal including a voice signal and digital data to the FM multiplex decoder 3. The FM multiplex decoder 3 demodulates multiplex digital data from the composite signal supplied from the FM tuner 2, and then performs PN decoding and error detection / correction,
The digital data is provided to the control unit 7. Note that an audio signal may be demodulated from the composite signal and output from a speaker (not shown) so that the user can listen to the FM broadcast program based on the audio signal.

The key input unit 4 is provided with keys operated by the user to control the operation of the receiver. For example, a program selection key for selecting a program, a page selection for selecting a page of the selected program, and the like. A key is provided. Display 5
Is realized by, for example, a liquid crystal display element in consideration of miniaturization and thinning of the receiver, and information related to the program selected by the user and the program such as the number of displayed pages, and the operation state of the receiver. And so on. Backlight 6
Is provided on the back side of the display unit 5 to illuminate the display unit 5,
Provides the light required for display. The memory 7 stores digital data provided from the control unit 8 in units of programs.

The control unit 8 controls the whole receiver, and determines the type of the input key from the key input unit 4, controls the display of the display unit 5, controls the turning on / off of the backlight 6, and controls the received digital data. It executes program creation processing and control of writing / reading digital data to / from the memory 7 in units of programs. Battery 9 includes a battery and a commercial AC power supply, and supplies power to the receiver. Warning sound generator 10
Is configured to include a speaker, and is driven by the control unit 8 when an emergency program is received, and generates a predetermined warning sound.

FIG. 2 is a diagram showing the structure of the packet data 15 output from the FM multiplex decoder 3. The packet data is composed of 288 bits.
6-bit bic (block identification code) data 16, 3
It comprises 2-bit prefix data 17, 144-bit data block 18, 14-bit CRC (cyclic redundancy check) code 19, and 82-bit parity data 20. Of the packet data,
The program (page) creation uses prefix data 17, data block 18, and CRC code 19 190
Bit data.

FIG. 3 is a diagram showing the structure of the prefix data 17. The prefix data 17 includes 4-bit service identification data 22, 1-bit decoding identification data 23, 1-bit information end flag 24, 2-bit update flag 25, 8-bit program number data 26,
It is composed of 6-bit page number data 27, link code data 28, and 8-bit packet number data 29. Using the prefix data 17, a page and program creation process based on the received digital data is performed. One page of data is obtained by connecting a plurality of packet data having the same program number data 26 and page number data 27 in the order of the packet number data 29 (in the order of increasing from 0 by 1), and setting the information end flag 24 to 1 It consists of a block up to packet data of bits (indicating the end of information). The data of one program is composed of a block of a plurality of page data having the same program number data 26.

The update flag 25 has four patterns of 0, 1, 2, and 3, and is incremented by 1 when the data transmitted from the broadcasting station is changed, and when the data is not changed, the same flag as the previous time is transmitted. You. The data may be changed on a page basis or on a program basis.

FIG. 4 is a time chart schematically showing processing contents in the receiver of the present invention. When the emergency broadcast program with the update flag 0 is received, the data is loaded into the memory 7, the data is displayed on the display unit 5, and an index check is performed to determine whether the emergency broadcast program is included in the index program. Will be An index search is performed each time an indexed program is received. The index program is the FM currently being received.
This is a program indicating the types of all programs multiplexed on the broadcast, and is configured by a program number predetermined for the type of program. Time has elapsed and update flag 0
When the emergency broadcast program is transmitted from the broadcasting station again and received by the receiver, the emergency broadcast program has the same contents as the program already stored in the memory 7, so that the data is taken into the memory 7 and displayed. No display to the unit 5 is performed.

If the emergency broadcast program with the update flag 1 is received after a further elapse of time, the program is different in content from the previously received program. Is displayed. Thereafter, when it is detected in the index search that there is no emergency broadcast program in the index program, that is, that there is no program number 255, the data of the emergency broadcast program stored in the memory 7 is deleted.

When there is no free space in the memory 7 when the emergency program is received, the other programs are deleted and the emergency program is stored.

Thereafter, when the emergency broadcast program is received again, even if the emergency broadcast program has the same update flag 1 as the emergency broadcast program received by the previous receiver, it is a program having different contents. 7, the data is displayed on the display unit 5, and an index search is performed. That is, when the emergency broadcast program is received first, the data is taken into the memory 7 and displayed on the display unit 5 regardless of the value of the update flag, and thereafter, the emergency broadcast program is included in the index program. During that time, data is fetched into the memory 7 and displayed on the display unit 5 every time the update flag is changed, and when it is detected that the transmission of the emergency broadcast program from the broadcast station is completed, Emergency broadcast program in memory 7
Erase from

Therefore, during the period when the emergency broadcast program is continuously transmitted from the broadcasting station, the emergency broadcast program can be reliably received and displayed regardless of the time when the receiver starts receiving the multiplex broadcast program. can do. Even if the emergency broadcast program disappears from the index program, if the emergency broadcast program is stored without being deleted from the memory 7, even if a new emergency broadcast program is received, it is already stored in the memory 7. If the emergency broadcast program and the update flag are the same, the program will not be loaded into the memory 7 and important information for the user will not be displayed, which is inconvenient. Such a disadvantage is solved.

FIG. 5 is a flowchart for explaining the process of receiving an emergency broadcast program in the receiver. This receiving process is performed every time packet data transmitted from a broadcasting station is received.

At step a1, it is determined whether or not a completed emergency program is stored in the memory 7. If it is stored, the process proceeds to step a2. If it is not stored, the process proceeds to step a4.

In step a2, it is determined whether a new emergency program has been received. If it has been received, the process proceeds to step a3. If it has not been received, step a7.
Proceed to.

At step a3, it is determined whether or not the update flag is the same between the emergency program already stored in the memory 7 and the newly received emergency program. If they are the same, it is determined that they have the same program content, and the process proceeds to the reception processing of the next packet data. If not identical,
It is determined that the program has different contents, and the process proceeds to step a4.

At step a 4, the received packet data is loaded into the memory 7. In step a5, it is determined whether or not the emergency program has been completed. If completed, the process proceeds to step a6. If not completed, the process proceeds to the next packet data receiving process.

In step a6, an alarm sound is generated from the alarm sound generation section 10, an emergency program is displayed on the display section 5, and the backlight 6 is turned on or blinks.

Returning to step a2, the memory 7
If the emergency program is stored in the storage device and the emergency program has not been received, the process proceeds to step a7. At step a7, it is determined whether or not the index program has been received. If it has been received, the process proceeds to step a8, and if it has not been received, the process proceeds to the next packet data receiving process.

At step a8, it is determined whether or not the update flag is the same between the index program already stored in the memory 7 and the newly received index program. If they are not the same, the process proceeds to step a9, and if they are the same, the process proceeds to the next packet data receiving process.

At step a 9, the received packet data is loaded into the memory 7. In step a10,
Determine if the emergency program is complete. If completed, the process proceeds to step a11. If not completed, the process proceeds to the next packet data receiving process.

At step a11, it is determined whether an emergency program is included in the index program. If not included, the process proceeds to step a12, in which the emergency program stored in the memory 7 is deleted, and the process proceeds to the next packet data receiving process. If it is included, the process proceeds to the next packet data receiving process without doing anything.

FIG. 6 is a flowchart for explaining a backlight control process when an emergency broadcast is received. This control processing is performed at regular time intervals after the backlight 6 is turned on or blinked in step a6 of the above-described flowchart of FIG.

At step b1, it is determined whether an AC adapter for supplying power from an AC commercial power supply is being used. This determination may be made by physically detecting that the AC adapter is plugged into the receiver using a switch or the like, or by a predetermined voltage from an AC commercial power supply (100 V in Japan). May be detected by electrically detecting that is supplied. If it is not used, the process proceeds to step b2, and if it is used, the process proceeds to step b4.

In step b2, it is determined whether a predetermined time has elapsed. If it has passed, the process proceeds to step b3,
The backlight 6 is turned off to reduce the power consumption of the battery 9 composed of a battery. If not, the process proceeds to the next process.

At step b4, it is determined whether or not the backlight off key of the key input unit 4 has been operated. If the operation has been performed, the process proceeds to step b3, and the backlight 6 is turned off. When the operation is not performed, since the power is supplied from the commercial AC power supply, it is not necessary to pay much attention to the power consumption.

As described above, according to the present embodiment, after the emergency program is first received, the update flags are compared each time the emergency program is received. Therefore, storage in the memory 7 and display on the display unit 5 are not performed, and if they do not match, the program has different contents. Therefore, storage in the memory 7 and display on the display unit 5 are performed. As a result, the emergency program can be received and displayed reliably, and the emergency program is displayed only when the content is changed, and the emergency program with the same content is repeatedly displayed as in a conventional receiver. Thus, there is no inconvenience in viewing other programs.

The above-described index search is continuously performed during the period when the emergency program is being received. When the emergency program is no longer detected in the index program, the emergency program is deleted from the memory 7. Thus, when an emergency program of a different series from the previously received emergency program, that is, an emergency program related to another emergency situation is newly received, the previous emergency program does not remain in the memory 7 because Thus, a new emergency program can be reliably stored in the memory 7 and displayed. In a conventional receiver, a previously received emergency program may be left in the memory as it is, so even if different emergency programs are coincident with the update flag, it is determined that the programs are the same, There is a risk that the information will not be notified to the user because the information is not stored in the memory. However, such a disadvantage is solved by the receiver of the present invention.

Further, when an emergency program is received and displayed on the display unit 5, a warning sound is generated at the same time, so that the user can surely view the emergency program.

Further, the emergency program is received and the display unit 5
, The backlight 6 is turned on or blinked, so that the user can surely view the emergency program.

When the emergency program is received and displayed on the display unit 5 and the backlight 6 is turned on or blinked to make the user know that the emergency program has been received, when the power of the receiver is supplied by the battery, Since the backlight 6 is turned off after a certain period of time, unnecessary power consumption can be reduced.

Further, even if there is no free space in the memory 7, if an emergency program is received, other programs are erased and the emergency program is stored, so that the emergency program can be reliably received. Can be.

[0046]

As described above, according to the present invention, after an emergency program is received for the first time, the update flags are compared each time the emergency program is received. Therefore, the program is not stored in the storage means and displayed on the display means. If they do not match, the program has different contents, so that the program is stored in the storage means and displayed on the display means.
As a result, the emergency program can be received and displayed reliably, and the emergency program is displayed only when the content is changed, and the emergency program with the same content is repeatedly displayed as in a conventional receiver. Thus, there is no inconvenience in viewing other programs.

The above-described index search is continuously performed during the period when the emergency program is being received. When the emergency program is no longer detected in the index program, the emergency program is deleted from the storage means. Thereby, when an emergency program of a different series from the previously received emergency program, that is, an emergency program related to another emergency situation is newly received, the previous emergency program does not remain in the storage means. Thus, a new emergency program can be reliably stored and displayed in the storage means. In a conventional receiver, a previously received emergency program may be left in the storage means as it is, so even if different emergency programs are coincident with the update flag, it is determined that the programs are the same. However, there is a possibility that the information is not notified to the user because the information is not stored in the storage means, but such a disadvantage is solved by the receiver of the present invention.

According to the present invention, when an emergency program is received and displayed on the display means, a warning sound is generated at the same time, so that the user can surely view the emergency program.

Further, according to the present invention, when an emergency program is received and displayed on the display means, the light source of the display means is turned on or off, so that the user can surely view the emergency program.

Furthermore, according to the present invention, when the emergency program is received and displayed on the display means, and the light source provided in the display means is turned on or blinked to make the user aware of the emergency program, the power of the receiver is controlled by the battery. Is supplied, the light source is turned off after a certain period of time, so that unnecessary power consumption can be reduced.

Further, according to the present invention, even when the storage means has no free space, if an emergency program is received,
Since the other program is deleted and the emergency program is stored, the emergency program can be received reliably.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a configuration of packet data 15 output from an FM multiplex decoder 3.

FIG. 3 is a diagram showing a configuration of prefix data 17;

FIG. 4 is a time chart schematically showing processing contents in the receiver of the present invention.

FIG. 5 is a flowchart illustrating a process of receiving an emergency broadcast program in a receiver.

FIG. 6 is a flowchart illustrating a backlight control process performed by the receiver when receiving an emergency broadcast.

[Explanation of symbols]

 Reference Signs List 1 antenna 2 FM tuner 3 FM multiplex decoder 4 key input unit 5 display unit 6 backlight 7 memory 8 control unit 9 battery 10 warning sound generation unit 15 packet data 16 block identification code data 17 prefix data 18 data block 19 CRC code 20 parity Data 22 Service identification data 23 Decoding identification data 24 Information end flag 25 Update flag 26 Program number data 27 Page number data 28 Link code data 29 Packet number data

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yukio Kawamoto 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka

Claims (5)

[Claims] 1. A plurality of types of programs multiplexed on an FM broadcast wave and repeatedly transmitted from a broadcasting station in a predetermined order, and one of the plurality of types of programs is currently multiplexed on the FM broadcast wave. Index programs that indicate the types of programs that are in use, including emergency programs in the event of an emergency such as a disaster, and each program including an update flag indicating that the content of the program has changed. Receiving means for receiving an FM broadcast wave, decoding means for decoding a multiplexed program from a received signal provided from the receiving means, and storing the received program. Storage means; display means for displaying a program; selection means for selecting a program to be displayed from a plurality of types of programs; and programs provided from the decoding means in the storage means in order. Control means for storing the program selected by the selection means, and reading the program from the storage means and displaying the program on the display means, when the emergency program is received. Starts an index search for checking whether or not the emergency program is included in the index program after storing the emergency program in the storage means and displaying the emergency program on the display means. When the emergency program is already stored, the update flag is compared between the emergency program already stored and the newly received emergency program, and if they do not match, the new emergency program is stored in the storage means, and FM multiplex broadcasting displayed on a display means, wherein when the index search detects that no emergency program is included in the index program, the emergency program is deleted from the storage means. For receiver. 2. The apparatus further comprises a warning sound generating means for generating a warning sound for notifying a user that an emergency broadcast has been received, wherein the control means displays the warning when displaying an emergency program on a display means. 2. The FM multiplex broadcast receiver according to claim 1, wherein the receiver generates sound. 3. The display unit includes a light source for supplying light required for display, and the control unit turns on or off the light source when displaying an emergency program on the display unit. The receiver for FM multiplex broadcasting according to claim 1 or 2. 4. A power supply unit for supplying power required for operation from a battery or a commercial AC power supply, wherein the control unit controls the light source when the power supply unit is supplying power from a battery. 4. The FM multiplex broadcast receiver according to claim 3, wherein the light source is turned off after a certain period of time after being turned on or blinking. 5. The control means according to claim 1, wherein when the emergency program is received, if there is no free space in the storage means, the other programs already stored are erased and the emergency program is stored. The FM multiplex broadcast receiver according to claim 1.