JPH10303831A - Fm multiplex broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the time till a broadcast program is displayed on a screen when a main broadcast station is switched to a competing broadcast station on a different channel, by receiving a broadcast program of the competing broadcast station on a different channel in the midst of receiving a broadcast program of the main broadcast station and storing contents of the competing broadcast station. SOLUTION: A program content obtained by receiving an FM multiplex broadcast signal from a main broadcast station is stored in a RAM circuit 5 and when data by designated programs are arranged, while a simple menu is displayed on a display device 9, a broadcast program of a competing broadcast station on a different channel is received and the received content is stored in the RAM circuit 5. When the competing broadcast station on a different channel is switched from the program of the main broadcast station, the reception of the FM multiplex broadcast signal sent from the competing broadcast station on a different channel is started and the reception content this time and the reception content of the competing broadcast station on a different channel having already been stored in the RAM circuit 5 are used to display a broadcast content of a new broadcast station onto the display device 9.

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 receiving apparatus for receiving an FM multiplex broadcast, and more particularly to an FM multiplex broadcast receiving apparatus for shortening the time required to display a screen when power is turned on or when a program is switched. .

[0002]

2. Description of the Related Art Generally, an FM multiplex broadcast signal used in Japan is composed of a normal FM broadcast signal and an FM broadcast signal multiplexed in a high frequency region on a baseband of the FM broadcast signal.
Multiplexed data, and the FM broadcast signal and the FM multiplexed data are loaded on the same carrier signal.
It is transmitted from an FM broadcast station as a multiplex broadcast signal.

FIG. 8 is a block diagram showing an example of an FM multiplex broadcast receiving apparatus which receives such an FM multiplex broadcast signal and reproduces the FM multiplex data.

The FM multiplex broadcast receiving apparatus 101 shown in FIG.
Includes an antenna 102 for receiving an FM multiplex broadcast signal transmitted from an FM broadcast station, and an FM multiplex tuner / decoder for separating and reproducing the FM multiplex data multiplexed on the FM multiplex broadcast signal received by the antenna 102 Circuit 103 and the FM multiplex tuner / decoder circuit 10
CPU circuit 104 which takes in and processes FM multiplexed data (background data, traffic condition data, etc.) output from
A RAM circuit 105 used as a temporary storage area of the CPU circuit 104, a ROM circuit 106 used as a storage area of constant data and the like used in the CPU circuit 104, and The CPU circuit 104 generates generated program selection data and the like.
107, a drawing LSI circuit 108 for creating screen data based on drawing data output from the CPU circuit 104, and a display 109 for displaying screen data output from the drawing LSI circuit 108 on the screen.
And

[0005] Based on the program selection data output from the remote control 107, the CPU circuit 104
The specified program is received by operating the multiplex tuner / decoder circuit 103, and the contents of the specified program (data classified by program number and page number) are fetched from the obtained FM multiplexed data. Is stored in the RAM circuit 105, and when the data for the designated program is ready, the data stored in the RAM circuit 105 is read out and the drawing LS is used as the drawing data.
The information is transferred to the I circuit 108, and information is displayed on the display 109.

[0006]

However, the conventional FM multiplex broadcast receiving apparatus 101 has the following problems.

First, various FMs conventionally used are described.
Among the multiplex broadcast receiving apparatuses, the FM multiplex broadcast receiving apparatus 10 capable of receiving and reproducing the level 2 (simple graphic type) of the FM multiplex broadcast
In FIG. 1, as shown in FIG. 9, static background data depicting a road, a place name, and the like (portion serving as a program common macro, for example, data changed by reviewing in units of months or years) and FIG. As shown in FIG. 11, one simple figure 112 shown in FIG. 11 is displayed based on dynamic traffic condition data (data that changes in real time, indicating congestion, congestion, and the like).

However, FM transmitted from an FM broadcasting station
It takes about 5 minutes to receive the background data contained in the multiplex broadcast signal, and about 2 minutes and 30 seconds to receive dynamic data. When the receiving broadcast station is switched, the RAM circuit 105
, All received contents up to that point (contents of a previously received program) are deleted, and the newly selected FM
It is necessary to receive the FM multiplex broadcast signal transmitted from the broadcast station, decode the FM multiplex data included in the FM multiplex broadcast signal, and newly store the contents of the program in the RAM circuit 105.

As described above, in the conventional FM multiplex broadcast receiving apparatus 101, when the power is turned off or the broadcast station to be received is switched, the RAM circuit 10
5, all the received contents stored in the receiver 5 are erased, and new received contents can be stored. Therefore, when the power is turned on or the FM broadcast station to be received is switched, the newly selected FM broadcast station is used. , And decodes the FM multiplex data in the FM multiplex broadcast signal, stores the contents of the program in the RAM circuit 105, and displays the simple graphic 112 on the display 109 at least. However, there is a problem that it takes 5 minutes or, in the worst case, 10 minutes or more.

The present invention has been made in view of the above circumstances, and has the following features.
Then, while receiving the broadcast of the main station, receive the broadcast of the back station, store the contents of this broadcast, and display the screen when switching from the main station to the back station. F that can shorten the time until it can be performed
An object of the present invention is to provide an M multiplex broadcast receiving device.

According to a third aspect of the present invention, there is provided an FM multiplex broadcast receiving apparatus capable of shortening a time required for displaying a screen when the power is turned on or when switching a receiving broadcast station. The purpose is.

[0012]

In order to achieve the above object, according to the present invention, an FM multiplex broadcast signal is received, and FM multiplex data included in the FM multiplex broadcast signal is extracted. In an FM multiplex broadcast receiving apparatus for displaying a graphic or a character corresponding to the FM multiplex data on a display, a broadcast from a back broadcast station is received during an idle time of receiving an FM multiplex broadcast signal from a main broadcast station. Means for receiving an FM multiplex broadcast signal and storing the received content; and when the reception of the main broadcast station is stopped and the reception of the back broadcast station is started, the broadcast content of the already stored back broadcast station is stored. Means for displaying a graphic or character corresponding to the FM multiplex data of the back broadcast station on a display by utilizing.

According to a second aspect of the present invention, the F
In the M multiplex broadcast receiving apparatus, the idle time is a retransmission period of static data transmitted from the main broadcasting station or a retransmission period of dynamic data.

According to a third aspect of the present invention, an FM multiplex broadcast signal is received, FM multiplex data included in the FM multiplex broadcast signal is extracted, and a graphic or a character corresponding to the FM multiplex data is displayed on a display. In the FM multiplex broadcast receiving apparatus, the nonvolatile memory for storing static data obtained by receiving the FM multiplex broadcast signal from the main broadcast station, and the broadcast station to be received when the power is turned on or the receiving station are switched. For example, when static data from a broadcast station specified as a reception target is required, it is checked whether the static data is stored in the nonvolatile memory, and the static data is already stored. And a means for displaying figures and characters corresponding to FM multiplex data from a broadcast station on a display using the static data. That.

[0015] In the above configuration, in the first aspect, the FM multiplex broadcast signal from the back broadcast station is received during the idle time while the FM multiplex broadcast signal from the main broadcast station is being received. The contents are stored, and when the reception of the main broadcast station is stopped and the reception of the back broadcast station is started, the FM of the back broadcast station is displayed on the display by using the broadcast contents of the back broadcast station already stored. By displaying figures and characters corresponding to the multiplexed data, when switching from the main broadcast station to the back broadcast station, the time until screen display can be performed is shortened.

According to a second aspect of the present invention, the broadcast of the main broadcasting station is received by using a retransmission period of static data and a retransmission period of dynamic data transmitted from the main broadcasting station as the idle time. In the meantime, receive the broadcast from the back station and store the contents of this broadcast in memory, and when switching from the main station to the back station, shorten the time until the screen can be displayed. I do.

According to the third aspect, the FM broadcast from the main broadcast station is used.
A broadcast station designated as a target to be received, such as when the power is turned on or when the broadcast station to be received is switched, having a non-volatile memory for storing static data obtained by receiving a multiplex broadcast signal When the static data is required, it is checked whether the static data is stored in the non-volatile memory, and when the static data is already stored, the static data is used for display. By displaying figures and characters corresponding to the FM multiplex data from the broadcasting station, the time required to display a screen when the power is turned on or when switching the receiving broadcasting station is shortened.

[0018]

FIG. 1 is a block diagram showing an embodiment of an FM multiplex broadcast receiving apparatus according to the present invention.

The FM multiplex broadcast receiving apparatus 1 shown in FIG.
An antenna 2 for receiving an FM multiplex broadcast signal transmitted from an FM broadcast station, and an FM
An FM multiplex tuner / decoder circuit 3 for separating and reproducing the FM multiplex data multiplexed on the multiplex broadcast signal, and an F output from the FM multiplex tuner / decoder circuit 3
A CPU circuit 4 for receiving and processing M multiplexed data (background data, traffic condition data, etc.), a RAM circuit 5 used as a temporary storage area of the CPU circuit 4,
A ROM circuit 6 used as a storage area for constant data and the like used in the CPU circuit 4; and program selection data and the like corresponding to contents operated by a user are generated.
A remote controller 7 for transmitting to the U circuit 4, a drawing LSI circuit 8 for creating screen data based on drawing data output from the CPU circuit 4, and a display 9 for displaying screen data output from the drawing LSI circuit 8 on a screen; It has.

Then, based on the program selection data output from the remote controller 7, the CPU circuit 4 operates the FM multiplex tuner / decoder circuit 3 to receive the FM multiplex broadcast signal from the designated broadcasting station. After the contents of the specified program (data classified by program number and page number) are fetched from the specified FM multiplexed data and stored in the RAM circuit 5, the data for the specified program is collected. Then, while transmitting the data stored in the RAM circuit 5 to the drawing LSI circuit 8 and displaying a simplified screen on the display 9, the broadcast contents of the pre-registered back broadcast station are received and the received contents are stored in the RAM. When the broadcast is stored in the circuit 5 and the current broadcast station is switched to the reverse broadcast station, the FM multiplex broadcast signal transmitted from the reverse broadcast station is received. As well as the beginning, displays the current received content using the received content of the back broadcast stations in the RAM circuit 5 is already stored broadcast contents of the new broadcasting station on the display 6.

In this case, as shown in FIG. 2, for each station, the first background data is transmitted in the first 5 minutes with respect to static background data in a period of 5 minutes, and the next background data is transmitted. The same background data is transmitted again in 5 minutes. As for the dynamic traffic condition data, the traffic condition data A is transmitted in the first 2.5 minutes with one cycle of 2 minutes and 30 seconds, and the same traffic condition data A is again transmitted in the next 2.5 minutes. In the next 2.5 minutes, the new traffic condition data B is transmitted, and in the next 2.5 minutes, the same traffic condition data B is transmitted again.

Furthermore, when each broadcasting station updates these static background data and dynamic traffic condition data, for example, when updating from traffic condition data A to traffic condition data B, an update flag (FM multiplex standard) is used. Then, a 2-bit flag) is updated to identify the data update.

Since the static background data does not change over time, it is not necessary to continuously receive the static background data when all of them can be received. On the other hand, for dynamic traffic condition data,
If the traffic condition data can be received in the first 2.5 minutes although it changes in a 5-minute cycle, there is no need to receive the traffic condition data during the retransmission period of the traffic condition data. Utilizing such a property, as shown in FIG. 3, during a period in which background data and traffic condition data are being retransmitted from the main broadcast station, the reception frequency of the FM multiplex tuner / decoder circuit 3 is switched to change the reception frequency on the user side. Start reception of the reverse broadcast station registered by manual setting or automatic setting, and
Stored in the AM circuit 5 and received new background data from the main broadcast station;
When new traffic condition data is transmitted, the receiving frequency of the FM multiplex tuner / decoder circuit 3 is returned to the original frequency (the frequency of the main broadcasting station), and the reception of the FM multiplex broadcasting signal transmitted from the main broadcasting station is resumed. I do.

Next, the operation of this embodiment will be described in detail with reference to the flowchart shown in FIG.

First, when an FM broadcast station (main broadcast station) to be received is specified by the remote controller 7 (step S).
1) This is detected by the CPU circuit 4 and the FM multiplex tuner / decoder circuit 3 is controlled to start reception of the FM multiplex broadcast signal transmitted from the broadcast station designated as the main broadcast station. Demodulation processing and decoding processing are performed (step S2).

Next, it is checked whether the static data update flag added to the static background data obtained by the demodulation processing and the decoding processing is the same as the previous static data update flag. If the content of the static data update flag is not the same as the previous one (step S3), the static background data of the main broadcast station output from the FM multiplex tuner / decoder circuit 3 is fetched and stored in the RAM circuit 5. (Step S4). Then, as shown in FIG. 5, a static data reception status check table 10 having a static data update flag column, a program number column, a page number column, and a reception status column is created, and the reception corresponding to the received program page is created. "1" is set in the status column (step S5).

In parallel with this operation, the dynamic update flag added to the dynamic traffic condition data obtained by the demodulation processing and the decoding processing by the CPU circuit 4 is the same as the previous dynamic update flag. Is checked. If the content of the dynamic update flag is not the same as the previous time (step S6), the FM multiplex tuner / decoder circuit 3
The dynamic traffic condition data of the main broadcast station output from the main broadcast station is fetched and stored in the RAM circuit 5 (step S).
7). Then, as shown in FIG. 6, a dynamic data reception status check table 11 having a dynamic update flag column, a program number column, a page number column, and a reception status column is created, and the reception status corresponding to the received program page is created. "1" is set in the column (step S8).

Thereafter, the above-described static background data reception processing and dynamic traffic situation data reception processing are repeatedly performed by the CPU circuit 4, and each reception situation in the static data reception situation check table 10 shown in FIG. When all the fields become "1" and all the reception status columns of the dynamic data reception status check table 11 shown in FIG. 6 become "1", the dynamic update flag of the dynamic traffic status data is set. Based on the update cycle, the transmission cycle of the dynamic traffic condition data broadcast from the main broadcast station is calculated, and the program contents of the main broadcast station stored in the RAM circuit 5 are read out. The drawing data is supplied to the drawing LSI circuit 8 as drawing data, and a simple figure is displayed on the display 6 (steps S2 to S2).
9).

In parallel with this operation, every time static background data and dynamic traffic condition data transmitted from the main broadcast station are all received, these static background data and dynamic traffic condition When the data retransmission period has come (step S
9) The switching of the FM multiplex tuner / decoder circuit 3 is controlled by the CPU circuit 4 to start reception of the back broadcast station (step S10).
The broadcast content of the back broadcast station output from the decoder circuit 3 is fetched and stored in the RAM circuit 5 (step S1).
1, S12), when the retransmission period of the static background data and the dynamic traffic condition data transmitted from the main broadcasting station ends (step S11), the switching of the FM multiplex tuner / decoder circuit 3 is controlled. Reception of the main broadcast station is restarted (steps S1 to S9).

Thus, when the user operates the remote controller 7 to stop the reception of the main broadcast station and instruct the reception of the reverse broadcast station, the CPU circuit 4 controls the FM multiplex tuner / decoder circuit 3 to control the reverse. The reception of the FM multiplex broadcast signal transmitted from the broadcast station is started, and R
The received content of the back broadcast station obtained by the current reception operation is added to the received content (broadcast content from the back broadcast station) stored in the AM circuit 5, and the broadcast of the back broadcast station is performed. When the contents are completed, the contents of each program stored in the RAM circuit 5 are read out, supplied to the drawing LSI circuit 8 as drawing data, and a simple figure is displayed on the display 9.

As described above, in this embodiment, the FM multiplex tuner / decoder circuit 3 is operated by the CPU circuit 4 on the basis of the program selection data output from the remote controller 7, so that the FM multiplex broadcast from the designated broadcasting station is performed. After receiving the signal, the contents of the specified program (data classified for each program number and page number) are fetched from the FM multiplex data obtained thereby, and stored in the RAM circuit 5, and When the data for the program is ready, RAM
While transferring the data stored in the circuit 5 to the drawing LSI circuit 8 and displaying a simple screen on the display 9,
The broadcast content of the pre-registered broadcast station is received and the received content is stored in the RAM circuit 5. When the broadcast station currently being received is switched to the broadcast station, the broadcast content is transmitted from the broadcast station. The reception of the current FM multiplex broadcast signal is started, and the broadcast content of a new broadcast station is displayed on the display 6 by using the current reception content and the reception content of the back broadcast station already stored in the RAM circuit 5. Is displayed. For this reason, when switching from the main broadcast station to the back broadcast station, it is possible to shorten the time required to display a simplified screen showing the broadcast contents of the back broadcast station on the display 9.

FIG. 7 is a block diagram showing another embodiment of the FM multiplex broadcast receiving apparatus according to the present invention.

The FM multiplex broadcast receiving apparatus 12 shown in FIG.
Is an antenna 13 for receiving an FM multiplex broadcast signal transmitted from a broadcasting station, and an FM multiplex tuner / decoder circuit for separating and reproducing FM multiplex data multiplexed on the FM multiplex broadcast signal received by the antenna 13 14
A CPU circuit 15 for receiving and processing the FM multiplex data (background data, traffic condition data, etc.) output from the FM multiplex tuner / decoder circuit 14;
RA used as a temporary storage area of U circuit 15
An M circuit 16, a ROM circuit 17 used as a storage area for constant data and the like used in the CPU circuit 15,
Among the program contents stored in the RAM circuit 16 which are constituted by a nonvolatile memory such as a flash memory,
A backup memory circuit 1 that stores data such as background data and retains the stored contents even when the power is turned off or when the receiving broadcast station is switched.
8, a remote controller 19 for generating program selection data according to the contents operated by the user and transmitting the data to the CPU circuit 15, and a drawing LSI circuit 20 for creating screen data based on drawing data output from the CPU circuit 15. And a display 21 for displaying screen data output from the drawing LSI circuit 20 on the screen.

Then, based on the program selection data output from the remote controller 19, the CPU circuit 15 causes the FM multiplex tuner / decoder circuit 14 to operate to receive the specified program, and from the obtained FM multiplex data, The contents of the selected program (data classified for each program number and page number) are fetched and stored in the RAM circuit 16, and among the data stored in the RAM circuit 16, static background data Are also stored in the backup memory circuit 18.

Thereafter, the dynamic traffic condition data stored in the RAM circuit 16 and the static background data stored in the RAM circuit 16 (or the previous traffic data stored in the backup memory circuit 18). When the specified program and the static background data obtained by the reception processing are completed, the data stored in the RAM circuit 16 and the data stored in the backup memory circuit 18 are rendered by the drawing LSI circuit. 20 to display a simple graphic on the display 21.

Accordingly, if the static background data from the currently receiving broadcast station is already stored in the backup memory circuit 18 in the previous reception processing, it is far more than the static background data. A simple figure can be displayed on the display 21 only by receiving dynamic traffic condition data of a small size.

As described above, in this embodiment, even if the power is turned off or the broadcast station to be received is switched, the static background data of each broadcast station that has been received so far is stored in the backup memory circuit 18. When the power is turned on or when the broadcast station being received is switched, the screen display can be performed using the static background data held in the backup memory circuit 18. Can be shortened.

[0038]

As described above, according to the present invention, according to the first and second aspects, while the broadcast of the main broadcast station is being received, the broadcast of the back broadcast station is received and the content of the broadcast is received. Can be stored in memory, and when switching from the main broadcast station to the back broadcast station, the time until screen display can be performed can be shortened.

According to the third aspect, when the power is turned on or when the broadcast station being received is switched, the time until the screen can be displayed can be shortened.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an FM multiplex broadcast receiving apparatus according to the present invention.

FIG. 2 is a timing chart showing an example of a background data transmission operation and a dynamic data transmission operation of a broadcasting station received by the FM multiplex broadcast receiving apparatus shown in FIG. 1;

FIG. 3 is a timing chart showing an example of a receiving station switching operation of the FM multiplex broadcast receiving apparatus shown in FIG. 1;

FIG. 4 is a flowchart showing an example of a receiving operation of the FM multiplex broadcast receiving apparatus shown in FIG. 1;

FIG. 5 is a schematic diagram showing an example of a static data reception status check table created by the FM multiplex broadcast receiving apparatus shown in FIG. 1;

FIG. 6 is a schematic diagram showing an example of a dynamic data reception status check table created by the FM multiplex broadcast receiving apparatus shown in FIG. 1;

FIG. 7 is a block diagram showing another embodiment of the FM multiplex broadcast receiving apparatus according to the present invention.

FIG. 8 is a block diagram illustrating an example of a conventionally known FM multiplex broadcast receiving apparatus.

9 is a schematic diagram showing an example of a simplified graphic of an FM multiplex broadcast displayed on the FM multiplex broadcast receiving apparatus shown in FIG. 8;

FIG. 10 is a schematic diagram showing a simple graphic example of FM multiplex broadcasting displayed by the FM multiplex broadcasting receiving apparatus shown in FIG. 8;

FIG. 11 is a schematic diagram showing an example of a simplified graphic of FM multiplex broadcasting displayed by the FM multiplex broadcasting receiving apparatus shown in FIG. 8;

[Explanation of symbols]

 1,12 FM multiplex broadcast receiving device 2,13 antenna 3,14 FM multiplex tuner / decoder circuit 4,15 CPU circuit 5,16 RAM circuit 6,17 ROM circuit 7 Remote control 8,20 Drawing LSI circuit 9,21 Display 10 Static Dynamic Data Reception Status Check Table 11 Dynamic Data Reception Status Check Table 18 Backup Memory Circuit 19 Remote Control

Claims (3)

[Claims] 1. An FM multiplex broadcast receiving apparatus for receiving an FM multiplex broadcast signal, extracting FM multiplex data included in the FM multiplex broadcast signal, and displaying a graphic or character corresponding to the FM multiplex data on a display. A means for receiving an FM multiplex broadcast signal from a back broadcast station during an idle time of receiving an FM multiplex broadcast signal from a main broadcast station, and storing the received content; When the reception of the back broadcast station is stopped and the reception of the back broadcast station is started, a graphic or a character corresponding to the FM multiplex data of the back broadcast station is displayed on the display by using the broadcast content of the back broadcast station which has already been stored. A FM multiplex broadcast receiving apparatus, comprising: means for displaying 2. The FM multiplex broadcast receiving apparatus according to claim 1, wherein the idle time is a retransmission period of static data transmitted from a main broadcasting station or a retransmission period of dynamic data. An FM multiplex broadcast receiving apparatus. 3. An FM multiplex broadcast receiving apparatus for receiving an FM multiplex broadcast signal, extracting FM multiplex data included in the FM multiplex broadcast signal, and displaying a graphic or a character corresponding to the FM multiplex data on a display. A non-volatile memory for storing static data obtained by receiving an FM multiplex broadcast signal from a main broadcast station, and a reception target such as when the power is turned on or when the broadcast station to be received is switched. When static data from the broadcast station specified is required, it is checked whether the static data is stored in the nonvolatile memory,
When the static data has already been stored, the static data is used to display the F
Means for displaying figures and characters corresponding to the M multiplex data, and an FM multiplex broadcast receiving apparatus comprising: