JPH08125555A - Fm multiplex broadcasting receiver - Google Patents

Abstract

PURPOSE: To allow a viwer to instantaneously watch the contents of a selected program by shortening time for waiting for the start of picture display at the time of selecting a program from among plural broadcasting programs and receiving it. CONSTITUTION: Macro data which is actually used in the program is identified by a using macro identification means 5. When the audience wants to change a receiving station by a receiving station changing means 3, a macro data storing means 6 prevents macro data transmitted by a receiving station after change from being instantaneously written into the data area of a macro memory 7 storing macro data used for display at the receiving station before change.

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 and displaying character and graphic data.

[0002]

2. Description of the Related Art In recent years, an FM multiplex broadcasting system for transmitting information such as characters and figures by utilizing a gap between conventional FM broadcasting waves has been studied. Since some reports on technical conditions have been made, trial manufacture of receivers and public reception experiments have been conducted. FM
In multiplex broadcasting, the data transmission speed is as low as about 6.8 kbps (excluding the error correction code section), and a method called a program common macro is adopted as a means for reducing the display speed of graphic data. A macro common to programs is coded to standardized graphic data on road maps, weather forecast maps, etc., transmitted collectively in advance, recorded in a receiver, and called by the above code in a timely manner in a program. ,
It is possible to instantly display a complicated figure on the receiver.

A conventional FM multiplex broadcast receiving apparatus using such a program common macro function will be described below.

FIG. 3 is a block diagram of a conventional FM multiplex broadcast receiver. In FIG. 3, 1 is an FM radio antenna,
2 is the F of the receiving station selected by the viewer from the received FM radio waves
FM multiple band extraction means for extracting the M multiple band, 3 is the receiving station changing means for the viewer to change the receiving station, and 4 is the FM
Demodulation means for demodulating the LMSK signal output from the multi-band extraction means 2 and performing error correction to demodulate FM multiplexed data.
a is transmission macro data output from the demodulation means 4 and 4b
Is a display macro code output from the demodulation means 4. 6
Is a macro data storage means, 7 is a macro memory, and 6
Reference characters a, 6b, and 6c are an address signal, a macro code, and macro data output from the macro data storage unit 6 to the macro memory 7, respectively. Reference numeral 8 is a drawing means for arranging macro data output from the macro memory 7 to form a display screen, and 9 is a display means for displaying a screen. FIG. 4 is a flow chart showing the operation of the macro data storage means 6 in FIG.

The operation of the conventional FM multiplex broadcast receiving apparatus configured as described above will be described below.

The FM radio wave induced in the antenna 1 is
The multi-band extracting means 2 filters the FM multi-band wave of the receiving station set by the receiving station changing means 3 and inputs it to the demodulating means 4. The demodulation means 4 demodulates a signal input as an LSMK modulated wave which is a modulation system of FM multiplex broadcasting,
Further, error correction by a shortened difference set cyclic code is performed to reproduce data of about 6.8 kbps. In FM multiplex broadcasting, a method called a program common macro is adopted as a means for reducing the display speed of graphic data. (Hereinafter, referred to as macro code), the data is collectively transmitted in advance, recorded in the receiver, and called by the macro code in the program at a proper time to display the figure on the receiver. During batch transmission of macro data, the demodulation means 4 outputs the demodulated transmission macro data 4a and the corresponding display macro code 4b to the macro data storage means 6. When calling with the macro code, the demodulation means 4 outputs the display macro code 4b to the macro data storage means 6.

The operation of the macro data storage means 6 will be described with reference to the flowchart of FIG. The macro data storage means 6 judges that macro transmission is in progress in S8 during batch transmission of macro data, and outputs the address signal 6a, macro code 6b, and macro data 6c to the macro memory 7 as shown in S13, and receives them. The macro code corresponding to the generated macro data is written in the macro memory 7, and the data area of the macro memory 7 is updated. Further, when the macro data is called by the macro code and displayed, the macro data storage means 6 determines in S9 that there is a call for macro display, and in S10, the called macro data exists in the macro memory 7. Whether or not it is present is determined, and if it is present, the address signal 6a is output to the macro memory 7, and the macro data called from the macro memory 7 is read and output to the drawing means 8. The drawing means 8 arranges the macro data output from the macro memory 7 to form a display screen, and outputs the display screen to the display means 9. The drawing means 9 is composed of a liquid crystal display tube or the like, and displays a screen for a viewer.

[0008]

However, in the above conventional configuration, when the viewer changes the receiving station, the macro data transmitted by the changed receiving station is immediately written in the macro memory. Therefore, when the viewer re-receives the original receiving station again in a short time, the macro data quoted in the display is already rewritten, and the screen display may continue until the macro data is received and recorded again. It had a problem that it could not be done.

The present invention solves the above-mentioned conventional problems, and even when the viewer changes the receiving station and re-receives the original receiving station again, the screen being transmitted by the original receiving station is immediately displayed. It is an object to provide an FM multiplex broadcast receiving device that can display.

[0010]

In order to achieve the above object, an FM multiplex broadcasting receiving apparatus of the present invention is connected to a receiving station changing means of FM multiplex broadcasting and a receiving station changing means, and is transmitted by FM multiplex broadcasting. Controlled by the used macro identification means for identifying the macro data actually used for display in the currently received program, the macro memory for storing the program common macro data, and the used macro identification means The macro data common to the program transmitted by the receiving station after being changed by the receiving station changing means from an address other than the address of the macro memory where the macro data used to display the program at the receiving station before the change is stored. And a macro data storage means for storing the data first.

[0011]

According to the present invention, when the viewer changes the receiving station, the use macro identifying means of the macro memory storing the macro data used for the program display at the receiving station before the change is stored. Prevents the macro data sent by the changed receiving station from being immediately written to the data area, and the screen being sent can be displayed immediately even if the viewer re-receives the original receiving station again. I am trying.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an FM multiplex broadcast receiving apparatus of the present invention. In FIG. 1, 1 is an FM radio wave antenna, 2 is an FM multiplex band extraction means for extracting the FM multiplex band of the receiving station selected by the viewer from the received FM radio wave, and 3 is a viewer for changing the receiving station. Receiving station changing means 4 are demodulating means for demodulating the LMSK signal output from the FM multiplex band extracting means 2 and performing error correction to demodulate FM multiplex data, which are the same as the conventional example shown in FIG. Reference numeral 5 is a used macro identification means for identifying a macro code used for display, of the transmitted macro data,
The display macro code 4b and the station change signal 3a from the receiving station change means 3 are input and the address control signal 5a is output. Reference numeral 6 is a macro data storage means whose operation is controlled by the address control signal 5a. Reference numeral 7 is a macro memory, 8 is a drawing means for arranging macro data output from the macro memory 7 to form a display screen, and 9 is a display means for displaying a screen, which are the same as those in the conventional example shown in FIG. Is. FIG. 2 is a flow chart showing the operation of the used macro identification means 5 and the macro data storage means 6 in FIG.

The operation of the FM multiplex broadcast receiving apparatus of the present invention configured as described above will be described below.

The operations of the antenna 1, the FM multiplex band extracting means 2, the receiving station changing means 3 and the demodulating means 4 are the same as those of the conventional example, and when the macro data is collectively transmitted, the demodulating means 4 is used.
Outputs the demodulated transmission macro data 4a and the corresponding display macro code 4b to the macro data storage means 6. When calling with the macro code, the demodulation means 4 outputs the display macro code 4b to the used macro identification means 5 and the macro data storage means 6.

The operations of the used macro identification means 5 and the macro data storage means 6 will be described with reference to the flowchart of FIG. As shown in S1, the used macro identifying means 5
The station change signal 3a determines whether or not a change has occurred in the receiving station since the receiver was started.

First, the operation when there is no change in the receiving station after the start of the receiver will be described. At the time of batch transmission of macro data, the macro data storage unit 6 determines in S8 that the macro data is being transmitted, and as shown in S13, the macro memory 7
In response, the address signal 6a, the macro code 6b, and the macro data 6c are output and the macro code corresponding to the received macro data is written in the macro memory 7 to update the data area of the macro memory 7. On the other hand, when calling and displaying the macro data with the macro code, the macro data storing means 6 determines in S9 that the macro display is called, and in S10, the called macro data exists in the macro memory 7. Whether or not it is present is determined, and if it is present, the address signal 6a is output to the macro memory 7 in S12, and the called macro data is read from the macro memory 7 and output to the drawing means 8. At the same time, the used macro identifying means 5 identifies and stores the address of the macro code used for the display in the transmitted macro data as shown in S11. The drawing means 8 arranges the macro data output from the macro memory 7 to form a display screen, and outputs the display screen to the display means 9. The drawing means 9 displays a screen for the viewer.

Next, the operation when the viewer changes the receiving station will be described. During batch transmission of macro data, the macro data storage means 6 determines in S2 that macro data is being transmitted. In S3 and S4, the used macro identifying means 5 causes the current receiving station to transmit to the macro data storing means 6 at an address other than the storage address of the macro data of the macro memory 7 used by the receiving station before the change. The address control signal 5a is output so as to store the macro data being processed. Therefore, it is possible to prevent the macro data transmitted by the changed receiving station from being immediately written into the data area of the macro memory 7 in which the macro data used for display at the receiving station before the change is stored. , Macro data used for display at the receiving station before change is protected.

Next, when there is no address other than the storage address of the macro data of the macro memory 7 used in the receiving station before the change, the used macro identifying means 5 is used in the receiving station before the change in S6. The address control signal 5a is output to release the storage address of the macro data,
The macro data storage unit 6 writes the macro data transmitted by the changed receiving station in the data area.

The operation of calling and displaying the macro data with the macro code is the same as that when the receiving station is not changed after the start of the receiver, and therefore the description thereof is omitted.

As described above, according to this embodiment, when the viewer changes the receiving station, the use macro identifying means 5 causes
It prevents the macro data transmitted by the changed receiving station from being immediately written to the data area of the macro memory 7 in which the macro data used for display on the receiving station before the change is stored. Even when the person re-receives the original receiving station again, the screen being transmitted can be displayed immediately.

[0022]

As described above, according to the present invention, even if the viewer changes the receiving station and re-receives the original receiving station again with a simple structure, the original receiving station is immediately transmitting. It is possible to realize an FM multiplex broadcast receiving device that can display a screen.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a used macro identification means 5 and a macro data storage means 6 of the FM multiplex broadcasting receiver according to the embodiment of the present invention.
Flowchart showing the operation of

FIG. 3 is a block diagram showing a configuration of a conventional FM multiplex broadcast receiving apparatus.

FIG. 4 is a flowchart showing an operation of a macro data storage unit 6 of a conventional FM multiplex broadcast receiving apparatus.

[Explanation of symbols]

 1 Antenna 2 FM Multiplex Band Extracting Means 3 Receiving Station Changing Means 4 Demodulating Means 5 Macro Identifying Means 6 Macro Data Storage Means 7 Macro Memory 8 Drawing Means 9 Display Means

Claims (1)

[Claims] 1. A receiving station changing means for FM multiplex broadcasting, and a program which is currently received among program common macro data connected to the receiving station changing means and transmitted by FM multiplex broadcasting, and is actually used for display. Used macro identifying means for identifying the generated macro data, a macro memory for storing program common macro data, and a common program controlled by the used macro identifying means and transmitted by the receiving station after being changed by the receiving station changing means Macro data storing means for storing macro data first from an address other than the address of the macro memory in which the macro data used for displaying the program at the receiving station before the change is stored. FM multiplex broadcasting receiver.