JPH08279772A - Fm multiplex broadcast receiver - Google Patents

Abstract

PURPOSE: To provide the FM multiplex broadcast receiver with which required data among a lot of data transmitted by FM multiplex broadcast can be efficiently stored in a memory. CONSTITUTION: FM broadcasting waves received through an antenna 1 to a reception circuit 2 are demultiplexed into a general broadcast signal and a multiplex broadcast signal by a detection circuit 3. The multiplex broadcast signal is demodulated to data by a data demodulation circuit 4. Those demodulated data are processed by a control means 5 provided by a microcomputer, etc. A memory 6 stores the data processed by the control means 5.

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 receiving data transmitted by being superimposed on an FM broadcast wave.

[0002]

2. Description of the Related Art FIG. 11 is a signal configuration diagram of FM multiplex broadcasting. In this FM multiplex broadcasting, data is added to a stereo signal broadcast from a general broadcasting station. The signals L + R and L-R are frequency bands of general FM broadcasting, and the shaded areas are the frequency bands of FM multiplex signals demodulated into data. The modulation method of this FM multiplex signal is LM
SK, subcarrier frequency is 76 kHz, bit rate is 1
It is 6 Kbps. FIG. 12 shows the frame structure of this FM multiplex signal. One frame consists of 288 × 272 bits, and each row is called a block. 19 per frame
It consists of a block for transmitting 0 data and a block of 82 parity for transmitting parity in the column direction. The first 16 bits of each block is a block identification code for identifying the block.

FIG. 13 shows page data header data, and there are two types, structure A and structure B. As shown in FIG. 13A, the structure A of the page data header data is composed of a program number, a page number, a presentation function, a genre, a display format, a page content update section, a header raster color and a raster color. The configuration B of the page data header data is, in addition to the information of the configuration A as shown in FIG. 13B, a prefecture identification code, a map type, a map magnification designation, map information X and Y, an information type, and an information providing time. , Link layer, link type and reference link number. The added information described above is information related to traffic information. For example, the information type represents information such as traffic jam, travel time, accident, regulation, caution, warning, parking lot, etc., depending on the combination of each bit. In addition, the link type represents information such as a highway, an urban highway, a trunk line, and other roads by a combination of bits.

[0004]

FM multiplex broadcasting outputs a large amount of data in time series. When receiving the FM multiplex broadcast, the receiving device needs to store the received data in many memories. However, as a product of the receiver, it is necessary to reduce the weight, the size, and the price, and the capacity of the memory for storing data is limited. for that reason,
When receiving a large amount of data, the data required by the user may not be received.

An object of the present invention is to provide an FM broadcast multiplex receiving device which can efficiently store necessary data in a memory.

[0006]

DISCLOSURE OF THE INVENTION The present invention is an FM multiplex broadcast receiving apparatus for receiving data to be transmitted by being superimposed on an FM broadcast radio wave, and selecting means for selecting the received data within a predetermined range. And an FM multiplex broadcast receiving apparatus including a memory that stores only the received data selected by the selecting means. Further, the present invention is characterized in that the selecting means selects only regional data regarding a preset route. Further, the present invention is characterized in that the selecting means selects only regional data within a predetermined region centered on the present location. Furthermore, the present invention further includes display means for displaying the data stored in the memory, and designating means for designating that the data displayed on the display means is unnecessary, and the memory is designated by the designating means. It is characterized by erasing data. Further, the present invention is characterized by including display means for displaying the data stored in the memory in a predetermined order. Further, the present invention provides a judging means for judging whether or not the data is normally received, and an alarm means for generating an alarm when the judging means judges that the data is not normally received. And is further included.

[0007]

According to the present invention, the selecting means selects the received data within a predetermined range and stores only the received data in the memory. Therefore, the data required by the user can be selected.

Further, according to the invention, the selecting means selects only regional data regarding a preset route.
Therefore, the data required by the user can be selected.

Further in accordance with the present invention, the selecting means comprises:
Only local data within a predetermined area centered on the current location is selected. Therefore, the data required by the user can be selected.

According to the invention, the display means displays the data stored in the memory, and the designating means designates that the data displayed on the display means is unnecessary. The memory erases the data designated by the designating means.
Therefore, the data required by the user can be selected.

Further according to the invention, the display means displays the data stored in the memory in a predetermined order. Therefore, the user can easily search the data.

Further according to the invention, the discriminating means determines whether or not the data is normally received. The alarm issuing means issues an alarm when the determining means determines that the data is not normally received. Therefore, the user can easily know the state when the data is not normally received.

[0013]

1 is a block diagram showing the electrical construction of an FM multiplex broadcast receiving apparatus according to an embodiment of the present invention. This FM multiplex broadcast receiver receives data transmitted by being superimposed on FM broadcast radio waves.

The FM broadcast radio wave received by the receiving circuit 2 via the antenna 1 is separated by the detecting circuit 3 into a general broadcast signal and a multiplex broadcast signal. The multiplex broadcast signal is demodulated into data by the data demodulation circuit 4. The demodulated data is processed by the control means 5 realized by a microcomputer or the like. The memory 6 stores the data processed by the control means 5. The display 7 displays the data and the like stored in the memory 6 via the control means 5. Further, the control means 5 determines whether or not the data is normally received in the receiving circuit 2, and if the data is not normally received, for example, an alarm sound is generated via the alarm sound generating circuit 8. Let The input means 9 is
The control unit 5 is configured by switches and the input switches are judged. Further, the control means 5 obtains information such as the current position from the navigation device 10.

In the FM multiplex broadcast receiver, the user can give a data selection instruction. For example, a desired genre can be selected by providing a switch for each genre (congestion, accident regulation, caution, etc.) and pressing the switch of the desired genre by the user. In addition, a switch is provided for each region (prefecture, city, prefecture, town, village, or set as a product specification), and the user selects the desired region by pressing the switch for the desired region. You can Therefore, the user can select only the area, only the genre, or a combination of the genre and the area. If the user does not press those switches, the user has selected all genres and regions as well as canceling the selection. Header data representing the content of the data is added to the received data, and the control means 5 can determine which genre data or which region data by detecting this header data. Data of a desired genre and area is stored in the memory 6.

FIG. 2 is a flowchart showing the processing contents of the FM multiplex broadcasting apparatus for selecting the above-mentioned genre and area. The process starts at step a1. Step a
In step 2, it is determined whether or not there is received data. If there is no received data, the process returns to step a2, and if there is received data, the process proceeds to step a3. In step a3, it is determined whether or not a genre is selected. If yes, the process proceeds to step a4. If no genre is selected, the process proceeds to step a6. In step a4, a genre is selected, and if the received data matches the data of the selected genre, the process moves to step a5, the received data is stored in the memory 6 as valid data, and the received data matches the selected genre. If not, the process proceeds to step a9 and the received data is not stored in the memory 6. In step a6, it is determined whether or not to select a region, and if so, the process proceeds to step a7, and if not, the process returns to step a2. In step a7, a region is selected, and if the received data matches the data of the selected region, the process proceeds to step a8, the received data is stored in the memory 6 as valid data, and the received data becomes the data of the selected region. If they do not match, the process proceeds to step a9 and the received data is not stored in the memory 6. When the processing of steps a8 and a9 is completed, step a
Returning to step 2, the next received data is processed.

In FM multiplex broadcasting, the capacity of the memory 6 is limited when storing received data. Therefore, as shown in FIG. 3, it is necessary to select only the data required by the user and store it in the memory.

Although a dedicated switch for data selection is provided in the flow chart of FIG. 2, if there is a genre / region switch for display data selection, it may be combined. In that case, for example, as shown in the flowchart of FIG. 4, the reading of the display data and the selection of the received data are distinguished by the time during which the display data switch is pressed.

The flowchart of FIG. 4 will be described below. The process is started in step b1. In step b2, it is determined whether or not the genre switch for selecting display data is pressed. If it is pressed, the process proceeds to step b3, and if not, the process proceeds to step b4. In step b3, if the genre switch is pressed for the first time, the process proceeds to step b5 to start counting the pressed time. Next, if the genre switch is continuously pressed, the processes of step b2, step b5 and step b6 are repeated, and the pressed time is counted.

Next, when the pressing of the genre switch is stopped, the process proceeds to step b4. In step b4, it is judged whether or not the pressing of the switch has been stopped for the first time, and if the pressing of the genre switch has been stopped for the first time, step b7
If the pressing of the genre switch is not canceled for the first time, the process returns to step b2. In step b7, it is determined whether or not the time when the genre switch is pressed is less than t seconds, and if it is less than t seconds, the process proceeds to step b8 to read and display the display data, and if t seconds or more, Moving to step b9, the reception data selection setting is set, and thereafter, the reception data is selected until the selection setting is released. Further, the already stored data on the memory may be selected and the data which does not satisfy the selection condition may be erased.

The selection of the reception data may be canceled by the user by operating the switch, or may be canceled by turning off the power supply. In addition, a light emitting diode may be added to the genre / region selection switch in order to notify the user of the presence / absence of the reception data selection setting. For example, when the selection of genre and area is set, the light emitting diode corresponding to the set switch is turned on in red.

The received data of the FM multiplex receiver is shown in FIG.
Coordinate data is added as shown in 3 (b). Further, since the coordinates of the current position and the destination can be obtained from the navigation device 10, it is possible to convert the coordinates into the coordinates dedicated to FM multiplex broadcasting. Therefore, as shown in FIG. 5, it is possible to obtain a straight line connecting the current position A and the destination B, and obtain a shaded area 20 around this straight line. By selecting and acquiring only the reception data to which the coordinates corresponding to the area 20 are added, the user can acquire the traffic information and the like required while traveling on the route. The width of the region 20 is determined on the assumption that the actual route is curved as shown by the broken line in FIG. 5, and may be changed according to the distance between the current position A and the destination B. For example, if the distance between the current location A and the destination B is long, the width is widened assuming that the route is large and winding, but conversely, if the distance between the current location A and the destination B is short, the width is narrowed. Further, it is possible to automatically select a desired broadcasting station according to the route and receive the data. For example, the frequency of a desired broadcasting station to be received along the route is set in advance, and the broadcasting station to be received is automatically selected according to the current position or the strength of the received radio wave.

Further, as shown in FIG. 6, the current position information from the navigation device 10 is acquired at regular time intervals, and a circular shaded area 21 centering on the current position is obtained. You may select only the received data to which the coordinate applicable to this area was added. Therefore, the area 21
Data is constantly updated. In addition, the size of the area 21 is
It may be variable so that the user can set it. Further, the current position of the area 20 shown in FIG. 5 may be acquired from the navigation device 10 at regular intervals, and the range of the area 20 may be updated as shown in FIG. 7. That is,
The range of the area 22 becomes narrower as the current location approaches the destination.

Since the memory capacity of the FM multiplex receiver is limited, if old data is held for a long time, new data cannot be taken in. In addition, if old information is held, the user has to obtain information with low reliability or select from a large amount of data when selecting display data, which makes retrieval time consuming. Therefore, as shown in the flowchart of FIG. 8, the data is erased after a certain time has elapsed since the data was received, and the next new data is received.

The flow chart shown in FIG. 8 will be described below. The process is started in step c1.
In step c2, it is determined whether or not there is received data. If there is received data, the process proceeds to step c3, and if there is no received data, the process proceeds to step c5. Step c
In 3, the received data is written in the memory. Step c
At 4, the hold timer is started. This hold timer exists for each received data. The data holding timer is preset to a fixed time, and when the data holding timer starts, it counts down. In step c5, it is judged whether or not the holding timer is 0, and if it is 0, the process proceeds to step c6, and if it is not 0, step c2
Return to At step c6, since the hold timer has become 0, the data stored in the memory is erased. Step c6
When the processing of (1) is completed, the process returns to step c2. The data retention time is set to a time at which the reliability of the content of the data seems to be low, for example, 15 minutes for congestion data that constantly changes the situation. The holding time may be set by the user. Further, since the information providing time is added to the data, the difference between this information and the current time obtained from the clock of the clock circuit may be obtained, and the received data may be erased using that value.

The FM multiplex broadcast receiver cannot display characters and the like on the display 7 unless data can be received. In a conventional receiver such as a radio, even if the received radio wave is weak and the broadcast cannot be received, noise is output as sound from the speaker, so that the product can be confirmed to be operating. However, in the case of the FM multiplex broadcast receiver, it cannot be determined whether the data is not received or the product is out of order. Therefore, when the data is normally received as shown in the flowchart of FIG. 9, a function of notifying that the data is being received is required.

The flowchart of FIG. 9 will be described below. The process starts at step d1. In step d2, it is determined whether or not there is received data. If there is no received data, the process moves to step d6, the display during reception on the display is turned off, and if there is received data, the process moves to step d3. At step d3, the data status information is read from the data demodulation circuit 4. In step d4, it is judged whether or not there is an error in the read data status information, and if there is an error, the process moves to step d6, the display during reception of the display 7 is turned off, and if there is no error, the process moves to step d5. , Figure 1
As indicated by 0, the display 7 lights up the display during reception.

Although the data demodulation circuit is composed of a semiconductor integrated circuit (IC) in this embodiment, it may be a circuit which is not composed of an IC. Further, although only the error status information from the demodulation circuit is used as the display condition during reception, status information indicating that synchronization (frame synchronization, clock synchronization) is established in data communication may be combined.

In the present embodiment, the character "Receiving" is displayed on the display 7, but other characters or figures may be displayed as long as it means "Receiving". Also display 7
It is also possible to express whether or not the display is in progress by turning on / off the light emitting diode without displaying.

Although the display shown in FIG. 10 is displayed by the level 1 display method, the actual map is displayed in conjunction with the level 2 display method for displaying a portion such as a traffic jam by a simple graphic and the navigation device. There is a level 3 display method for displaying a portion such as a traffic jam in the figure representing "."

In the FM multiplex broadcast receiving apparatus, the user has to retrieve the data required by the user from many received data. Although data can be classified according to information such as genre and region, it takes time to search for necessary data from the classified data. Therefore, it is possible for the user to delete the data that is determined to be unnecessary when the user is searching for the data.

When the list of received data can be seen, the data judged unnecessary is picked up and erased. A dedicated switch for erasing data may be provided as a switch for erasing, or an existing switch may be used in combination.
For example, by pressing a plurality of existing switches at the same time, erasing unnecessary data is started. When displaying the received data one by one and searching by page turning, the displayed data is erased when it is judged unnecessary. The switch to be erased is the same as the switch described above. Although the switch is used for erasing, the remote control switch and the voice control may be used without being limited to the switch.

As described above, in the FM multiplex broadcast receiving apparatus, the user has to retrieve the data required by the user from among many received data. The received data can be classified by genre, region, etc. from the added information, and the data search frame can be limited. However, although the search frame can be limited, desired data must be searched from a plurality of data. At this time, when viewing a list of data or displaying the data one by one to check the contents, it is difficult to search if the data are randomly arranged. Therefore, the data is displayed in coordinate order to facilitate the search.

The coordinate data may be added to the reception data of the FM multiplex broadcast as described above. Since this coordinate data has a relative relationship with the longitude and the latitude, it is possible to select and display the data in the order of the latitude and the longitude using this coordinate data. For example, when a list of received data is output and the user searches for desired data from the list, the list is created in the order of coordinates. In a system in which data is displayed one by one and pages are searched while searching, the data to be displayed is extracted in the search order. When the current position data can be acquired from the navigation device 10, the current position is F
You may convert into the coordinate of the data of M multiplex broadcasting, and display the data in the order close to the present position. Also, the above contents may be fixed as the specifications of the product, or the user can turn on the function.
You may be made to be able to select / OFF and the standard of rearrangement. Further, although the stored data is displayed in the coordinate order while being selected in the above-mentioned embodiment, it may be stored in the memory 6 in the coordinate order in advance upon reception.

[0035]

As described above, according to the present invention, the data required by the user can be efficiently stored in the memory. Further, since the data stored in the memory are displayed in a predetermined order, the user can easily search for the data. Further, the user can easily determine whether or not the data is normally received. As a result, it is possible to obtain an FM multiplex broadcast receiving device that can realize product weight reduction, downsizing, price reduction, and functional efficiency improvement.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing content for selecting a genre and a region.

FIG. 3 is a diagram for explaining selection of data required by a user.

FIG. 4 is a flowchart showing the processing contents when the genre switch is used both for reading display data and selecting genres of received data.

FIG. 5 is a diagram for explaining obtaining an area 20 from a current location A and a destination B.

FIG. 6 is a diagram for explaining obtaining an area 21 centered on the current location.

FIG. 7 shows a case where the current location A moves toward the destination B,
It is a figure for demonstrating obtaining area | region 22.

FIG. 8 is a flowchart showing processing contents for deleting received data after a predetermined time.

FIG. 9 is a flowchart showing the processing contents of an error when receiving data.

FIG. 10 is a diagram showing a display example during data reception.

FIG. 11 is a diagram showing transmission parameters of FM multiplex broadcasting.

FIG. 12 is a diagram showing a frame configuration of FM multiplex broadcasting.

FIG. 13 is a diagram showing page header data of FM multiplex broadcasting.

[Explanation of symbols]

 1 antenna 2 receiving circuit 3 detection circuit 4 data demodulating circuit 5 control means 6 memory 7 indicator 8 warning sound generating circuit 9 input means 10 navigation device 20-22 area

Claims (6)

[Claims] 1. An FM multiplex broadcast receiving apparatus for receiving data transmitted by being superimposed on an FM broadcast radio wave, comprising: selecting means for selecting received data within a predetermined range; and selecting means by the selecting means. An FM multiplex broadcast receiver including a memory for storing only received data. 2. The FM multiplex broadcast receiving apparatus according to claim 1, wherein the selecting means selects only regional data relating to a preset route. 3. The FM multiplex broadcast receiving apparatus according to claim 1, wherein the selecting means selects only regional data within a predetermined area centered on the current location. 4. The display device further comprises display means for displaying the data stored in the memory, and designating means for designating that the data displayed on the display means is unnecessary, and the memory is designated by the designating means. The F according to claim 1, wherein the data is erased.
M multiplex broadcasting receiver. 5. The FM multiplex broadcast receiving apparatus according to claim 1, further comprising display means for displaying the data stored in the memory in a predetermined order. 6. A discriminating means for discriminating whether or not the data is normally received, and an alarm means for issuing an alarm when the discriminating means judges that the data is not normally received. The FM multiplex broadcast receiving apparatus according to any one of claims 1 to 5, further comprising: