JPH1155199A - Character-broadcasting receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a character-broadcasting receiver which instantaneously displays character information on a display, on-demand when a power source is turned on. SOLUTION: This character broadcasting receiver is provided with an antenna 1 for receiving a multiplex broadcasting wave carrying digital character information divided to plural program channels, a front/end circuit 2 for selecting a desired frequency from the received FM multiplex broadcasting wave to convert into an intermediate frequency signal, a data conversion circuit 8 for converting a digital signal multiplexed in a low-frequency signal which converts an intermediate frequency signal to digital character information data, a memory 21 for storing character information data, a display 23 for displaying character information converted into a character and a microcomputer 24 for controlling the system as a whole. In this case, the microcomputer 24 controls a state where character information data is stored and updated in the memory 21 at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teletext receiver for receiving a multiplex broadcast wave such as an FM radio broadcast carrying digital text information.

[0002]

2. Description of the Related Art FM multiplex broadcasts are broadcasted by broadcasters using general FM broadcasts.
Digital text information broadcasting is carried out by multiplexing with audio signals of radio broadcasting, and the portion not used for audio signal broadcasting in one channel band (100 kHz) of commercial FM radio broadcasting in the 76 to 90 MHz band is used. And then broadcast the text information.

Conventionally, as this type of teletext receiving apparatus,
For example, there is Japanese Patent Application No. 05-071552, and FIGS.
There exists a thing of a structure shown in FIG. As shown in FIG. 3, reference numeral 1 denotes an antenna for receiving an FM multiplex broadcast wave carrying digital text information, and 2 denotes a desired frequency selected from the FM multiplex broadcast waves received by the antenna 1. A front end circuit for converting the output signal of the front end circuit 2 into a low frequency signal; a stereo demodulation circuit for extracting a stereo audio signal from the output signal of the detection circuit 3; An amplification circuit for amplifying the output signal of the stereo demodulation circuit 4; a speaker 6 for converting the output signal of the amplification circuit 5 into sound; a data demodulation circuit 7 for extracting a multiplexed digital signal from the output signal of the detection circuit 3; Reference numeral 8 denotes a data conversion circuit for converting an output signal of the data demodulation circuit 7 into digital character information data. Program channel selection circuit for selecting digital information data, 1
Reference numeral 0 denotes a display for converting digital character information data into character information comprising characters and displaying the character information.
Reference numeral 1 denotes a microcomputer for controlling the front end circuit 2, data conversion circuit 8, program channel selection circuit 9, and display 10. Reference numeral 12 denotes a menu switch for displaying a menu screen of the program channel. Reference numeral 13 denotes a cursor in the menu screen. An up switch that moves in the direction, a down switch that moves the cursor in the menu screen downward, and a program channel selection switch 15 that selects the program channel indicated by the cursor in the menu screen.

Next, the operation of this device will be described below with reference to the frequency spectrum diagram of FIG. 4, the data conceptual diagram of character information of FIG. 5, the menu selection screen diagram of FIG. 6, and the flowchart of the operation of FIG. I do.

When the power switch is turned on, a desired frequency channel is selected by the front end circuit 2 from the FM multiplex broadcast waves input to the antenna 1, and the desired frequency channel is converted into a low frequency signal by the detection circuit 3. Is done.
The signal of the received FM multiplex broadcast wave is, as shown in FIG.
It has a frequency spectrum in which a digital signal containing character information data is arranged on a higher frequency side than the LR audio signal of a normal FM broadcast, and the digital signal is distinguished from the LR audio signal at a later stage. Next, the stereo demodulation circuit 4
The signal is demodulated into an audio signal, and the LR audio signal is amplified by the amplifier circuit 5 so that the audio can be heard from the speaker 6.

On the other hand, the output signal of the detection circuit 3 is also input to the data demodulation circuit 7, and the digital signal is demodulated. The demodulated digital signal is converted by the data conversion circuit 8 into digital character information data. The character information obtained by converting the character information data again may be arranged, for example, as shown in FIG.
The CRC check code, the program channel B, the character information of the program channel B, and the CRC check code are transmitted in the order shown in FIG. Program channels A, B, and C
For example, A is news, B is weather forecast, and C is traffic information. Here, the CRC check code is a code for checking whether or not the transmitted data has been correctly received. The data conversion circuit 8 performs a conversion process under the control of the microcomputer 11.

Next, the menu switch 12 is operated to display a menu selection screen as shown in FIG. And
As shown in step A1 of FIG. 8 (hereinafter referred to as “STA1”), the up switch 13 and the down switch 14
Is operated to move the cursor, and by operating the program channel selection switch 15, an arbitrary program channel is selected, for example, traffic information of the program channel C.

[0008] When an arbitrary program channel is selected in the STA 2, for example, digital character information data corresponding to the program channel C is stored in a memory provided in the program channel selection circuit 9. Next, in STA3, when the data accumulation is completed, the display 10 displays the character information converted again according to the instruction of the microcomputer 11. If data accumulation is not completed, it is checked whether any program channel has changed (ST
A1) The data accumulation operation is continued.

Next, in STA4, the microcomputer 11 checks whether or not the power switch of the teletext receiver is turned off. If the power switch is not turned off, the microcomputer 11 checks whether an arbitrary program channel is changed (STA1). Is repeated.

[0010]

In the conventional teletext receiving apparatus described above, a desired program channel is selected by operating a program channel selection switch 15 while looking at a menu selection screen displayed on the display 10. Thus, the character information of the program channel can be displayed on the display 10.

However, after turning on the power switch, the digital character information is received and the converted character information data is stored in the memory, so that the converted character information is displayed on the display 10 again. By the time, there was a problem that a relatively long time was required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a text broadcast receiving apparatus in which text information is instantly displayed on demand on a display when a power switch is turned on. To provide.

[0013]

According to a first aspect of the present invention, there is provided an antenna for receiving a multiplex broadcast wave carrying digital text information divided into a plurality of program channels. A front-end circuit for selecting a desired frequency from a received FM multiplex broadcast wave and converting it to an intermediate frequency signal, and converting a digital signal multiplexed into the low frequency signal obtained by converting the intermediate frequency signal into digital character information data A teletext receiver including a data conversion circuit for converting, a memory for storing text information data, a display connected to the memory to display text information converted into text, and a microcomputer for controlling the whole. The microcomputer is configured to control the character information data to be constantly stored in the memory and updated.

According to a second aspect of the present invention, in the first aspect, the microcomputer controls the character information data over all the program channels to be always stored in the memory.

According to a third aspect of the present invention, in the first or second aspect, the character information is information in which emergency information is provided in a specific program channel, and the microcomputer is configured to transmit the emergency information. The character information data is controlled so as to be preferentially transmitted from the memory to the display.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the display device comprises:
The character information is scroll-displayed in a flowing state.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. Note that members having substantially the same functions as those in the conventional example are denoted by the same reference numerals.

Reference numeral 1 denotes an FM in which digital character information is conveyed.
An antenna 2 for receiving multiplex broadcast waves, a front end circuit 2 for selecting a desired frequency from the FM multiplex broadcast waves received by the antenna 1 and converting it to an intermediate frequency signal, and 3 an output signal of the front end circuit 2 for a low frequency signal Detector circuit to convert to
4 is a stereo demodulation circuit for extracting a stereo audio signal from the output signal of the detection circuit 3, 5 is an amplification circuit for amplifying the output signal of the stereo demodulation circuit 4, 6 is a speaker for converting the output signal of the amplification circuit 5 into audio, 7 is a data demodulation circuit for extracting a multiplexed digital signal from the output signal of the detection circuit 3, and 8 is a data conversion circuit 8 for converting the output signal of the data demodulation circuit 7 into digital character information data.
This is the same as the conventional teletext receiver.

Here, the data conversion circuit 8 converts, in other words, the digital signal multiplexed into the low frequency signal obtained by converting the intermediate frequency signal into digital character information data. The character information is divided into a plurality of program channels, and emergency information is provided in a specific program channel among the program channels.

Reference numeral 21 denotes a memory, which stores character information data output from the data conversion circuit 8 by an SRAM capable of reading and writing data at high speed. This will be described later in detail. 22 is a transmission interface, a memory 2
1 and transmits the character information data stored in the memory 21.

Reference numeral 23 denotes a display, which is an LED display 23, a fluorescent display tube, a liquid crystal display 23, a CRT, or the like, has a screen, is connected to the memory 21 via the transmission interface 22, A microcomputer 24 converts the transmitted character information data into character information composed of characters and displays the character information converted into characters. The microcomputer 24 is a front end circuit 2, a data conversion circuit 8, a memory 21, a transmission interface 22, And the display 23 to control the entire system.

Here, all character information data over all program channels output from the data conversion circuit 8 is controlled to be always stored in the memory 21 and stored in the memory 21 in an updated state. When the emergency information is received, the character information data of the emergency information is preferentially stored in the memory 2.
While controlling to transmit from 1 to the display 23,
The power switch of the display 23 is automatically turned on.

Reference numeral 25 denotes an operation unit.
A frequency selection switch provided on the main body connected to the main unit 4 for selecting a desired frequency, and a program channel selection switch (not shown) for selecting a desired program channel at the desired frequency; And operating the program channel selection switch to set the desired frequency and program channel, respectively. Also,
An emergency information receiving buzzer and an emergency information receiving light emitting diode (LED) (both not shown) are provided, respectively, and sound and emit light when emergency information is received.

The operation of this embodiment will be described below with reference to FIG. 2 showing a flowchart. First, in ST11,
When the power switch is turned on and power is supplied, a standby mode is set, and the light emitting diode (LE)
D) lights in green, and multiplex broadcast waves carrying digital text information are always received. Then, the microcomputer 24 controls the entire character information data over all the program channels to be always stored in the memory 21, and the all character information data is stored and stored in the memory 21 each time it is received.

In ST12, when an emergency broadcast is received in the standby mode, the microcomputer 2
Reference numeral 4 indicates that a data code representing emergency information is input from the data conversion circuit 8 and the power switch of the display 23 is automatically turned on (ON) and the character information data of the emergency information is transferred from the memory 21 to the display 23. Transmission interface 2
2 is preferentially transmitted. In ST13, the emergency information receiving light emitting diode emits light and flashes in red to indicate that it is in the emergency broadcast mode, and the switch is turned off.
If N, the emergency information reception buzzer sounds to notify that the emergency broadcast has been received, and the emergency information is displayed on the screen of the display 23.

In step ST14, when an emergency broadcast is not received, when the power switch of the display 23 is turned on, an LED is displayed.
Is turned on and emits light in red to enter the display mode, and the character information is displayed on the screen of the display 23. At this time, since the character information data of all the program channels is constantly stored and updated in the memory 21, the latest character information is displayed on the screen instantly when the operation section 25 is operated to select a desired program channel. When an emergency broadcast is received in this state (ST14)
a), the process jumps to the emergency broadcast mode ST13, and the emergency information is preferentially displayed on the screen of the display unit 23. When the power switch of the display 23 is turned off (ST14).
b) Return to the standby mode ST11.

In the teletext receiver according to the first embodiment, as described above, the text information data is stored in the memory 2.
1 is always stored and updated each time a signal is received. When the power switch of the display 23 is turned on, the character information converted into characters is instantaneously displayed on the display 23 with the updated character information. The information can be viewed on demand, and the character information can be repeatedly displayed and confirmed.

Further, since all the character information data over all the program channels is controlled by the microcomputer 24 so as to be always stored in the memory 21, any desired program channel can be used for any program channel. You can see text information instantly. .

If the emergency information is provided on a specific program channel, the microcomputer 24 controls the character information data of the emergency information to be preferentially transmitted from the memory 21 to the display 23. Therefore, when the emergency information is broadcast by text multiplex broadcasting and the power switch of the display device 23 is turned on, the emergency information is preferentially displayed on the display device 23, so that the emergency information can be quickly notified. .

In the first embodiment, all the character information data over all the program channels are always stored in the memory 21, but the character information data of some of the plurality of program channels may be stored. , But not limited to.

In the first embodiment, the microcomputer 24 controls the character information data of the emergency information to be preferentially transmitted from the memory 21 to the display 23. However, when the emergency information is not provided on the program channel. Does not need to preferentially transmit the character information data of the emergency information to the display 23 and is not limited.

In the first embodiment, the operation section 25 is connected to the microcomputer 24 and provided on the main body. However, the operation section 25 is provided on a remote controller for transmitting operation signals using a wireless transmission element. A wireless receiving element for receiving an operation signal from the remote controller connected to the main body may be provided, and the wireless receiving element may receive the operation signal from the remote controller and set a desired frequency and a specific program channel, Not limited.

In the first embodiment, a multiplex broadcast wave carrying digital text information is used as an FM radio wave.
It is not limited to TV radio waves instead of radio waves.

A second embodiment of the present invention will be described below.
In the second embodiment, functions different from those in the first embodiment will be described, and members having substantially the same functions as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

In the second embodiment, the display 23 is formed so as to repeatedly scroll and display on the screen in a state where the characters of the character information are flowing.

In the teletext receiver according to the second embodiment, as described above, the display 23 is formed so as to scroll and display the text of the text information, so that the text data is long text information. Also, it is possible to easily and reliably transmit character information to a person by successively scrolling and displaying the characters in a time series in a state where each character is enlarged.

[0037]

According to the first aspect of the present invention, since the character information data is always stored in the memory and updated each time it is received,
When the power switch of the display unit is turned on, the converted character information is instantaneously displayed on the display unit in an updated state, so that the latest character information can be viewed on demand and the character information is repeatedly displayed Can be confirmed.

According to the second aspect, in addition to the effect of the first aspect, since all the character information data over all the program channels is controlled by the microcomputer so that it is always stored in the memory, it is possible to obtain a desired data. Regardless of the program channel, the character information of any program channel can be instantly viewed. .

According to the third aspect, in addition to the effects of the first or second aspect, if the emergency information is provided in a specific program channel, the microcomputer can provide the emergency information. When the emergency information is broadcast by text multiplex broadcasting and the power switch of the display is turned on, the emergency information is given priority to the display. Emergency information can be promptly notified.

According to the fourth aspect, in addition to the effects of any one of the first to third aspects, the display is formed so as to scroll and display the characters of the character information in a flowing state. Even if it is character information, each character is enlarged and scrolled continuously in time series,
Character information can be easily and reliably transmitted to a person.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart of the operation of the above.

FIG. 3 is a configuration diagram showing a conventional example.

FIG. 4 is a frequency spectrum diagram of the FM multiplex broadcast wave of the above.

FIG. 5 is a conceptual diagram of text information of FM multiplex broadcasting according to the embodiment;

FIG. 6 is a diagram of a menu selection screen of the display device according to the first embodiment.

FIG. 7 is a flowchart of the operation of the above.

[Explanation of symbols]

 Reference Signs List 1 antenna 2 front-end circuit 8 data conversion circuit 21 memory 23 display 24 microcomputer

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04N 7/035

Claims (4)

[Claims] An antenna for receiving a multiplex broadcast wave carrying digital text information divided into a plurality of program channels, and a desired frequency selected from the received FM multiplex broadcast wave is converted into an intermediate frequency signal. A front-end circuit,
A data conversion circuit that converts a digital signal multiplexed into a low-frequency signal obtained by converting an intermediate frequency signal into digital character information data, a memory that stores character information data, and a memory that is connected to the memory and is converted into characters. In a teletext receiver including a display for displaying text information and a microcomputer for controlling the whole, the microcomputer controls the text information data to be constantly stored in the memory and updated. A teletext receiving apparatus characterized by the above-mentioned. 2. The teletext receiving apparatus according to claim 1, wherein the microcomputer controls the text information data over all the program channels to be always stored in the memory. 3. The character information wherein emergency information is provided in the specific program channel, and the microcomputer preferentially transmits the character information data of the emergency information from the memory to a display. The teletext receiving device according to claim 1, wherein the teletext receiving device is controlled. 4. The teletext receiving apparatus according to claim 1, wherein the display is formed to scroll and display the text of the text information in a flowing state.