JP2553341Y2 - FM multiplex broadcast receiver - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The invention is intended to receive and demodulate an FM multiplex broadcast in which an information program (code data) composed of figures and text is multiplexed and transmitted to an audio FM broadcast. Related to a receiving device.

<Prior Art> FIG. 5 shows a block diagram of a conventional FM multiplex broadcast receiving apparatus.

The FM multiplex broadcast transmitted from the broadcast station is received by the antenna 1, and the FM multiplex audio signal of the selected channel is selected by the tuner 2 and output. The channel selection by the tuner 2 is controlled by the CPU 6 based on a channel selection signal input from the channel selection key via the key interface 8.

After the selected FM multiplexed audio signal is detected by the FM detection circuit 3, the band-pass filter 4 extracts the multiplexed data (code data of figures and characters) from the FM multiplexed audio signal.
Output to the capture control circuit 5. An error correction BEST (Burs
t and randon Error correction System for Teletex
After performing t), the CPU 6 checks the prefix (PFX) indicating the type of the information program, and fetches code data for each information program and stores it in the memory 7.

When the receiver sets a desired information program by operating a program selection key (not shown), a program setting number is input to the CPU 6 via the key interface 8. The CPU 6 reads out and decodes the code data of the information program corresponding to the program setting signal from the capture memory 7. The decoding is performed by converting the address of the code data and reading out the corresponding pattern data from the character memory 9.

The decoded pattern data is converted to image data via the display control circuit 10 and transferred to the image memory 11, and then transmitted to the data reproducing device 12 to reproduce the pattern data. Examples of the data reproducing device 12 include a liquid crystal display panel, a monitor television, and a printer.

If the multiplexed code data is music data of another program, the multiplexed code data is converted into a music signal via a music synthesizer 14 controlled by a timer 13 and output from a speaker 15. 16 is a bus line.

As the code data multiplexed on the audio FM broadcast, for example, when the audio FM broadcast is classical music, the conductor,
Comments such as performers, composers, song titles, etc., lyrics for songs in time with songs, traffic information, weather information, and news for vehicles such as cars I do.

<Problems to be solved by the invention> However, since the baud rate of data transmission in the current FM multiplex broadcasting is as small as about 1 kbps, regardless of multiplexing character data, figures such as traffic information and weather information using maps are used. When multiplexing data, there is a problem that transmission and reception take a very long time.

For example, it takes about one minute (64 seconds) to transmit one screen of 256 dots x 256 lines, and other information cannot be transmitted during this time, so the amount and types of available information are greatly restricted. .

The present invention was created in view of such circumstances, and aims to expand the applications by enabling the reception of graphic data in a short time, enriching the amount and types of information that can be used. With the goal.

<Means for Solving the Problems> The present invention has the following configuration in order to achieve such an object.

That is, the FM multiplex broadcast receiving apparatus of the present invention extracts code data from an FM multiplexed audio signal obtained by multiplexing code data of a plurality of information programs including graphics and characters into an audio FM broadcast, and generates a code corresponding to a set program number. In an FM multiplex broadcast receiving apparatus configured to decode pattern data of a corresponding information program from data and reproduce the pattern data by a data reproducing apparatus, external pattern data serving as a basis of each information program is designated by a program number of the information program. And an image memory in which the corresponding external pattern data read from the external memory is written based on the set program number. The decoded pattern data is overwritten, and the overwritten composite pattern data is reproduced by a data reproducing device. It is those, which is configured as.

<Operation> The operation according to the above configuration of the present invention is as follows.

The external pattern data serving as the basis of the information program is stored in the external memory, and the external pattern data is overwritten on the received decoded pattern data in the image memory. In the case where the information occupies a large percentage of bits as shown in Fig. 3, the basic graphic information such as a constant map is stored in an external memory as external pattern data, so that the information is broadcast from a broadcasting station. Received by the receiving device
Code data having a small number of bits can be adopted as code data of an information program to be multiplexed on the FM multiplex audio signal.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an FM multiplex broadcast receiving apparatus. In the figure, 1 is an antenna, 2 is a tuner, 3 is an FM detection circuit, 4 is a bandpass filter, 5 is an acquisition control circuit,
6 is a CPU, 7 is a capture memory, 8 is a key interface, 9 is a character memory, 10 is a display control circuit, 11 is an image memory, 12 is a data reproducing device, 13 is a timer, 14 is a music synthesizer, 15 is a speaker, 16 Is a bus line,
Since these structures are the same as those of the conventional example described with reference to FIG. 5, the same reference numerals are given here, and the description is omitted.

In the present embodiment, an external memory 18 is connected to the bus line 16 via an external memory interface 17. The external memory 18 stores in advance pattern data serving as a basis of a graphic for a plurality of information programs including a graphic or a graphic and a character. The external memory 18 may be a floppy disk, an IC card, a ROM cassette, a magnetic disk, a magnetic tape, or the like.

FIG. 2 shows the format of the pattern data stored in the external memory 18. The header portion includes a program number for each information program that has been previously agreed with the broadcasting station, a start address where pattern data for each information program is stored, and a data length of each pattern data. ing. In the program table, pattern data for each information program is stored in association with the program number.

The pattern data includes, for example, pattern data of a plurality of road maps for each region, pattern data of a nationwide map for weather information, and pattern data of a plurality of maps for each region, for example, relating to traffic information.

Next, the operation of the FM multiplex broadcast receiving apparatus according to this embodiment will be described.

The receiver operates a channel selection key (not shown) to input a channel selection signal to the CPU 6 via the key interface 8. The CPU 6 controls the tuner 2 based on the input tuning signal.
And set the channel to be selected.

The FM multiplex broadcast transmitted from the broadcast station is received by the antenna 1, and the FM multiplex audio signal of the selected channel is selected by the tuner 2 and output. Selected FM multiplex audio signal
After being detected by the FM detection circuit 3, the band pass filter 4
Code data relating to the multiplexed information program is extracted from the multiplexed audio signal and output to the acquisition control circuit 5.

After performing the error correction BEST on the extracted code data in the capture control circuit 5, the CPU 6 checks the prefix (PFX) indicating the type of the information program on the basis of the program number included in the code data. Is stored in the acquisition memory 7 every time.

The information programs stored in the capture memory 7 include:
In addition to traffic information and weather information, there are news, lyrics for songs and songs, and comments for classical music.
The data of these information programs includes data consisting of figures and characters, data of figures only, data of characters only, and music data of another program.

In this way, the code data of the information program is stored in advance in the memory 7, so that the receiver can retrieve and reproduce the information program when necessary. The reproduction is performed according to the flowchart shown in FIG.

When the receiver operates a program selection key (not shown) to set a desired information program, a program setting signal is input to the CPU 6 via the e-interface 8. In step S1, the CPU 6 registers the set program number indicated by the input program setting signal according to the flowchart shown in FIG. Next, in step S2, the number of the set program is searched from the bed part in the program table in the external memory 18 via the external memory interface 17.

Then, in step S3, it is determined whether or not the corresponding information program is in the external memory 18, and if so, the process proceeds to step S4, where the pattern data of the corresponding program number is read from the program table in the external memory 18. The read data is transferred to the image memory 11 via the external memory interface 17 and the display control circuit 10.

Next, in step S5, the code data of the set program corresponding to the program setting signal is read from the capture memory 7, the address is converted, and the pattern data is read from the character memory 9 to decode the code data into pattern data. The manner of conversion from the code data to the pattern data is determined in advance between the broadcasting station and the FM multiplex broadcast receiver.

Then, in step S6, the decoded pattern data is transferred to the image memory 11 via the display control circuit 10, and in the image memory 11, the external pattern data (step S4) transferred from the external memory 18 and previously written Overwrite the pattern data decoded from the code data.

This overwriting means that the bit portion representing the figure or character surrounded by the frame in the decoded pattern data deletes the corresponding portion of the external pattern data, preferentially writes the decoded pattern data, and In the decoded pattern data, the bit portion representing a figure or character having no frame and the plain bit portion of the background not representing anything are negated, and the external pattern data is preferentially left as it is, and is written. It is.

When the overwriting is completed, in the next step S7, the display control circuit
Drive 10 The display control circuit 10 driven by the CPU 6 reads out the overwritten composite pattern data from the image memory 11, converts it into image data, and sends it to the data reproducing device 12. Thereby, the data reproducing device 12
Play and display the composite image data. As a form of this display, an image may be output to a liquid crystal display panel or a monitor television, or may be printed by a printer.

The information program corresponding to the judgment in step S3 is stored in the external memory 18.
If not, the processing of steps S5 to S7 is performed without performing the processing of step S4. In this case, the pattern data written to the image memory 11 is only the pattern data read and decoded from the capture memory 7, and the display is also only the image data based on the decoded pattern data.

The music synthesizer controlled by the timer 13
A music signal can be created at 14 and output from the speaker 15.

Next, a case where traffic information is received by a car will be described as a specific example.

The automobile is equipped with the above-described FM multiplex broadcast receiving apparatus, and its external memory 18 stores pattern data of a plurality of road maps. An example of an image corresponding to the pattern data is shown in FIG. This figure (a)
Is assumed to be n, for example, and the receiver wants to know the traffic information in the area shown in FIG.

FM multiplexed audio signals containing various types of multiplexed data are successively transmitted from broadcasting stations. Recipients know the time zone and channel on which traffic information is transmitted. Before the time period, the receiver sets a channel to be selected by operating a channel selection key. In this state, it waits for the FM multiplexed audio signal of the program number n in which the traffic information is multiplexed to be transmitted from the broadcasting station.

In the traffic information broadcasting time zone, traffic information of various areas is sent one after another. When the traffic information of the area related to the set program n is received, the CPU 6 receives the traffic information via the capture control circuit 5. The information is fetched and stored in the fetch memory 7. FIG. 4B shows an example of an image corresponding to the pattern data converted from the code data relating to the traffic information.

As shown in the figure, the figure represented by the pattern data of the traffic information has a smaller number of bits than the road map shown in FIG. 4 (a). , And frame data surrounding them.

The receiver sets the program number n by operating the program selection key when he wants to know the traffic information relating to the area of the program number n. Then, in steps S1 to S4, the pattern data of the road map shown in FIG. 5A is read from the external memory 18, transferred to the image memory 11, and stored.

Next, the code data of the set program n is read out from the capture memory 7 and converted into the pattern data shown in FIG. 6B through the character memory 9, and the data of the road map shown in FIG. Overwritten with pattern data. Then, the combined pattern data is displayed on a liquid crystal display panel or the like. FIG. 4 (c) shows the state.
Shown in

As described above, since the number of bits of the traffic information is small, the time required for the capture processing by the capture control circuit 5 and the storage in the capture memory 7 can be reduced. Therefore, transmission and reception of traffic information and display of the received traffic information can be performed quickly.

It should be noted that various information other than traffic information is handled, such as weather information and event information, and the processing speed is high. Therefore, the amount and types of available information can be increased and the use can be expanded.

In the above embodiment, the overwriting method of giving priority to the bit portion representing the figure or character surrounded by the frame in the decoded pattern data over the external pattern data is adopted, but the present invention is not limited to this. Alternatively, logical OR data of decoded pattern data representing a figure or character having a frame and external pattern data may be displayed.

<Effects of the Invention> According to the present invention, the following effects are exhibited.

Even if the information to be reproduced in the data reproducing device is information having a large number of bits such as traffic information and weather information,
By storing basic graphic information such as a constant map in the external memory as external pattern data, the code data of the information program to be multiplexed to the FM multiplex audio signal is excluded from the basic graphic information. Code data having a small number of bits. Then, the external pattern data read from the external memory and the decoded pattern data based on the received code data are overwritten in the image memory, and the synthesized pattern data is reproduced, so that the information to be obtained can be reproduced without lack. .

That is, since the code data multiplexed on the FM multiplexed audio signal can be reduced in number of bits, not only the possibility of being affected by external noise and the like can be reduced, but also processing for extracting the code data from the FM multiplexed audio signal, The process of decoding the pattern data of the corresponding information program from the code data can be performed in a short time, thereby making it possible to abundantly increase the amount and types of available information and expand the application.

In addition, the external pattern data is stored in association with the program number, and when the program number is set, the corresponding external pattern data is read out based on the program number. Thus, the external pattern data can be read out, whereby the display of the composite pattern data in which the external pattern data is overwritten on the decoded pattern data can be performed in a short time.

[Brief description of the drawings]

1 to 4 relate to an embodiment of the present invention, FIG. 1 is a block diagram of an FM multiplex broadcast receiving apparatus, FIG. 2 is a format of external pattern data, FIG. FIG. 4 is an explanatory diagram of a specific example in the case of traffic information. FIG. 5 is a block diagram of a conventional FM multiplex broadcast receiving apparatus. 4 band-pass filter for extracting code data from FM multiplexed audio signal 5 capture control circuit for performing error correction on extracted code data 6 CPU CPU 7 capture memory for storing code data 8 program setting signal Key interface for input, 9 ... Character memory for decoding corresponding pattern data from code data, 10 ... Display control circuit, 11 ... Image memory, 12 ... Data reproducing device, 18 ... External memory

Claims (1)

(57) [Scope of request for utility model registration] A code data is extracted from an FM multiplexed audio signal obtained by multiplexing code data of a plurality of information programs comprising graphics and characters into an audio FM broadcast, and a code information corresponding to a set program number is extracted from the code data corresponding to the set program number. FM configured to decode pattern data and play it on a data playback device
In the multiplex broadcast receiving apparatus, an external memory that stores external pattern data serving as a basis of each information program in association with a program number of the information program is read from the external memory based on a set program number. And an image memory in which the corresponding external pattern data is written. In the image memory, the decoded pattern data is overwritten on the external pattern data, and the overwritten composite pattern data is reproduced by a data reproducing device. An FM multiplex broadcast receiving apparatus characterized in that: