JP3232969B2 - Text multiplex receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FM multiplex broadcasting receiver for receiving FM multiplex broadcasting as new media.
More specifically, it is added to another receiver such as a television broadcast receiver or a television text multiplex receiver to automatically display FM text multiplex information.

[0002]

2. Description of the Related Art In recent years, FM text multiplex broadcasting, which provides additional information by superimposing additional information on FM music broadcasting, has attracted attention as a new medium. At present (as of February 1995), there is only one main broadcast in the Tokyo metropolitan area, and only one test broadcast in the Osaka metropolitan area. From April, the main broadcast will be performed by 33 JFN net stations nationwide.

[0003] As service contents, not only supplementary programs such as program information of FM radio, but also information useful for daily life such as weather traffic information and news are immediately obtained. Further, DGPS and pager services for broadcasting and correcting error information of a GPS navigation system, which has become remarkably popular in recent years, have been studied, and are one of the media expected to develop in the future.

A typical FM character multiplex receiver has a configuration as shown in FIG. In this figure, an FM text multiplex receiver includes a tuner 2 for receiving a predetermined FM broadcast via an antenna 1 and an FM multiplex decoder 4 for demodulating a text multiplex signal superimposed on the FM broadcast received by the tuner 2. A control unit 7 for temporarily storing the demodulated FM character multiplexed signal in the memory 8 and transmitting a corresponding FM character multiplexed signal to a display control circuit 5 described later by selecting a program, and a display device 6 ( (For example, a liquid crystal display device). The control unit 7 also controls the tuner 2,
The memory 8 stores a control program of the control unit 7 in addition to the storage of the FM character multiplexed signal. The audio signal received by the tuner 2 is amplified and supplied to a speaker, but is omitted in the figure.

In the FM character multiplex receiver configured as described above, a program is selected by a normal key operation, and the control unit 7 is selected from the FM character multiplex signal once stored in the memory 8.
Is transmitted to the display control circuit 5. As described above, the information to be obtained is displayed on the display device 6.

The FM character multiplex receiver is a portable or vehicle-mounted device for collecting information, and is easily added to a liquid crystal television or the like and can be easily considered as a device capable of capturing a plurality of pieces of information by one unit.

[0007]

However, in the above configuration, the display of a plurality of information including the FM character multiplexed information is switched by a key operation, or the plurality of information is displayed at the same time, so that the human eyes and I had no choice but to select the information I needed.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a character multiplex receiver capable of automatically displaying an FM character multiplex signal only when necessary.

[0009]

In order to achieve the above object, when an FM character multiplexing receiver and a television receiver are combined, the FM character multiplexing signal demodulated by the FM multiplexing decoder is suitable for a display device. Along with display control means for converting to a video signal and switching means for switching the video signal to another video signal such as a television broadcast and superimposing and displaying the same, a timer is used to automatically display the FM character multiplexed signal at regular time intervals. To do it. Alternatively, the FM character multiplex signal is sequentially
A character information comparison circuit that compares the previously stored FM character multiplexed information automatically displays the FM character multiplexed signal only when the information of the FM multiplexed broadcast signal is updated.

When the FM character multiplex receiver and the TV character multiplex receiver are combined, the TV character multiplex signal and the F character are output based on the error correction information output from the TV character multiplex decoder.
An information switching circuit for switching between the M character multiplex signal and the M character multiplex signal automatically switches the signal to be displayed on the screen from the television character multiplex signal to the FM multiplex character signal when the reception condition is poor.

[0011]

According to the above configuration, when the FM teletext receiver and the television receiver are combined, the television image is usually enjoyed, and the television image is transmitted every certain time interval or every time the information of the FM multiplex broadcast signal is updated. Character information is automatically added and displayed on the screen, so that the time for disturbing the television image can be minimized and all character information can be obtained.

Further, when the FM teletext receiver and the TV teletext receiver are combined, the above-mentioned configuration allows the FM teletext receiver to be used.
Taking advantage of the merit that it can be received even in places where the reception status of teletext broadcasting is poor, and the advantage that the amount of information of teletext broadcasting is large, usually a teletext television signal is obtained,
If the FM character multiplex signal is automatically obtained in a place where the reception situation is poor, the most efficient information can be received according to the situation. In other words, to give an example,
If you want to watch the news, usually receive detailed news by TV teletext broadcasting, and receive simplified news by FM teletext broadcasting in places where reception conditions are poor such as by moving on a vehicle The most efficient information can be obtained anytime and anywhere.

[0013]

【Example】

(Embodiment 1) First, a text multiplex receiver according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a character multiplex receiver according to a first embodiment of the present invention. In addition,
In FIG. 1, the same parts and corresponding parts as those in FIG.

In FIG. 1, part (A) shows a conventional F
It is the same as the M broadcast receiver, and a detailed description is omitted. Here, the difference from the conventional example is that synchronization signals (HD, VD) are input to the display control circuit 5 from a video signal processing circuit 14 to be described later, and a display synchronized with a television video signal is performed. Thereby, the FM character multiplexed signal and the television video signal can be simultaneously displayed on the display device 6 without synchronization. The part (a) is a television receiver and a timer and a switching circuit which are the main components of the present invention.

Now, a radio wave is input to the television broadcast receiving tuner 12 via the antenna 1 ', a program is selected by the control unit 7, and a video signal demodulation circuit 13 and a video signal processing circuit 14 at the subsequent stage provide a video signal. (RGB signal) and a synchronization signal (HD, VD). The above operation is exactly the same as that of a general television receiver. The television video signal and the FM character multiplexed signal from the display control circuit 5 of the FM broadcast receiver are input to a switching circuit 16, and one of them is selected by a switching signal from a control unit 7 described later. The switching signal is generated by the control unit 7 based on the timer 15.

The operation of the character multiplex receiver according to the first embodiment configured as described above will be described with reference to FIG. FIG. 2 is a display example of the character multiplex receiver according to the first embodiment of the present invention. Assuming that the timer 15 is set to one hour, a television video signal is normally displayed as shown in (a), and FM character multiplexing is performed on the television video signal every hour as shown in (a). The signals are superimposed and displayed, and the programs (or all programs) selected by the key operation are displayed one page at a time in order. After the last page is displayed as shown in (U), the display automatically returns to that shown in (A). The time for displaying one page can be freely set in the control unit 7, and the function of the timer 15 can be performed by the control unit 7.

As described above, according to the present embodiment, FM character multiplexed information can be automatically obtained at regular time intervals, such as a news bulletin, while enjoying a television broadcast.

(Embodiment 2) The embodiment 2 is almost the same as the embodiment 1, and the block diagram of FIG.
5 is omitted.

As described in the first embodiment, the television video signal and the FM character multiplexed signal from the display control circuit 5 of the FM broadcast receiver are input to the switching circuit 16 and the control unit 7 described later.
Is selected according to the switching signal from. The switching signal is generated based on the timer 15 in the first embodiment. However, in the present embodiment, the character information comparing unit in the control unit 7 sequentially converts the FM character multiplexed signal from the FM decoder 4 into a signal. It is made by comparing with the FM character multiplex signal stored in the memory-8. Specifically, the program management data of the FM character multiplex signal has a content update flag of 2 bits, and every time the content is updated, it is 00 to 01 to 10 to 11 to 00 to 00.
The switching signal can be made by comparing the content update flags. The switching operation based on the switching signal is the same as that in the first embodiment, and will not be described here.

As described above, according to the present embodiment, only when the information of the FM multiplex broadcast signal is updated, the FM character multiplex information whose content is updated at regular time intervals, such as a news bulletin, is enjoyed while enjoying the television broadcast. You can get it automatically.

(Embodiment 3) FIG. 3 is a block diagram of a character multiplex receiver according to a third embodiment of the present invention.

In FIG. 3, the portion (c) is the conventional F
It is the same as the M broadcast receiver, and a detailed description is omitted. Here, the difference from the conventional example is that synchronization signals (HD, VD) are input to the display control circuit 5 from a video signal processing circuit 14 to be described later, and a display synchronized with a television video signal is performed. Thereby, when switching between the FM character multiplex signal and the television character multiplex signal on the display device 6, synchronization does not flow.
Part (d) is a television character multiplex receiver. Now, a radio wave is input to the television broadcast receiving tuner 12 via the antenna 1 ', a program is selected by the control section 7, and a composite video signal is formed by the video signal demodulation circuit 13 at the subsequent stage. The composite video signal is further processed by the video signal processing circuit 14.
The display control circuit 5 demodulates the signal into a synchronization signal (HD, VD).
Is input to A television character multiplex signal is superimposed on the composite video signal.
7 demodulates into a television character multiplex signal. The TV character multiplexed signal after demodulation is selected by the control unit 7 and the corresponding TV character multiplexed signal is transmitted to the display control circuit 5. However, the error status (error correction result flag) output from the TV character multiplex decoder 17 is determined by the control unit 7, and if the error correction of the demodulated TV character multiplex signal is insufficient, the FM character The FM character multiplexed signal demodulated by the multiplex decoder 4 is transmitted to the display control circuit 5. As described above, when the reception condition is poor, the signal displayed on the screen is automatically switched from the television character multiplex signal to the FM character multiplex signal. However, the program selection of the FM character multiplex signal to be switched as described above requires that the program linked to the program selection of the TV character multiplex signal be stored in the memory 8 in advance.

As described above, the present embodiment takes advantage of the advantage that FM text multiplex broadcasting can be received even in a poor reception condition and the advantage that the amount of information of TV text multiplex broadcasting is large. If a signal is obtained and an FM character multiplex signal is automatically obtained in a place where the reception condition is poor, the most efficient information can be received according to the condition. In other words, to give an example, if you want to see the news, you will normally receive detailed news by teletext broadcasting on TV, and simplify it by FM teletext broadcasting in places where reception conditions are poor due to movement on vehicles. The most efficient information can be obtained anytime and anywhere by receiving the news.

[0024]

As described above, when the FM teletext receiver and the TV receiver are combined, the switching circuit and the timer or the comparison circuit of the FM text multiplex signal usually enjoy the television picture and have a certain period of time. At each interval or every time the information of the FM multiplex broadcast signal is updated, the character information is automatically added and displayed on the television image, and the time that disturbs the television image is minimized, and all the character information is displayed. Obtainable. In particular, when an FM character multiplexed signal comparison circuit is used, new information such as breaking news of a television broadcast can be automatically obtained.

When an FM teletext receiver and a teletext television receiver are combined, a television teletext signal is normally obtained by a display signal switching circuit based on error correction information. If an FM character multiplex signal is obtained, the most efficient information can be received according to the situation.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a character multiplex receiver according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a display example of a character multiplex receiver according to the first embodiment of the present invention.

FIG. 3 is a schematic block diagram of a character multiplex receiver according to a third embodiment of the present invention.

FIG. 4 is a schematic block diagram of a conventional FM character multiplex receiver.

[Explanation of symbols]

 1, 1 'antenna 2 FM broadcast receiving tuner 4 FM multiplex decoder 5 display control circuit 6 display device 7 control unit 8 memory 12 TV broadcast receiving tuner 13 video signal demodulation circuit 14 video signal processing circuit 15 timer 16 switching circuit

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-64831 (JP, A) JP-A-9-27930 (JP, A) JP-A 8-65591 (JP, A) JP-A-6-65591 311060 (JP, A) JP-A-7-59065 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 1/16 H04N 5/445

Claims (3)

(57) [Claims] 1. An FM broadcast receiving tuner, means for controlling the tuner, and an FM broadcast tuner based on a signal received by the tuner.
An FM multiplex decoder for separating and demodulating an M multiplex broadcast signal; display control means for converting an FM text multiplex signal demodulated by the FM multiplex decoder into a video signal suitable for a display device; A character multiplex receiver comprising: switching means for switching to and superimposing and displaying another video signal such as a television broadcast, and wherein the display of the FM character multiplex signal is automatically performed at fixed time intervals by a timer. 2. An FM broadcast receiving tuner, means for controlling the tuner,
An FM multiplex decoder for separating and demodulating an M multiplex broadcast signal; display control means for converting an FM character multiplex signal demodulated by the FM multiplex decoder into a video signal suitable for a display device; A switching means for switching to another video signal such as a broadcast, and superimposing and displaying the video signal; and a character signal comparing circuit for sequentially comparing the FM character multiplex signal with the previously stored FM character multiplex signal. A character multiplex receiver that automatically displays FM character multiplex information only when information is updated. 3. A tuner for receiving an FM broadcast, means for controlling the tuner, and an FM broadcast tuner based on a signal received by the tuner.
An FM multiplex decoder for separating and demodulating the M multiplex broadcast signal, display control means for converting the FM character multiplex signal demodulated by the FM multiplex decoder into a video signal suitable for a display device, A tuner, means for controlling the tuner, a television text multiplex decoder for separating and demodulating a television text multiplex broadcast signal from a signal received by the tuner, and a television text multiplex signal demodulated by the television text multiplex decoder And a display signal switching circuit for switching between a TV character multiplex signal and an FM character multiplex signal based on the error correction information output from the TV character multiplex decoder. If the situation is bad, the character multiplexing automatically switches the signal to be displayed on the screen from the TV character multiplexing signal to the FM character multiplexing signal. Shin machine.