KR950014379B1 - Determined time display device of a first page in receiving text in formation - Google Patents

Abstract

a tuner for selecting a broadcasting signal of a constant frequency band of broadcasting signals received from a public network; an intermediate frequency amplifying part for generating an intermediate frequency signal by frequency converting the broadcasting signal selected by the tuner; a sound processing part for demodulating the intermediate frequency signal inputted from the intermediate frequency amplifying part, and sending the sound signal to a speaker; an image detecting part for inputting an image intermediate frequency signal outputted from the intermediate frequency amplifying part, and outputting a composite image signal; a color demodulating part for color demodulating the composite image signal into a chrominance signal for a general television video program; a monitor controller for compounding the analog letter information signal with horizontal and vertical synchronizations and a luminance signal, and outputting a color signal for the letter information; a switching part for selecting one of the chrominance signal and the color signal by means of a mode selecting signal, selecting the output color signal of the monitor controller during a predetermined time through an input of a mode conversion signal, and selecting the output chromainance signal of the color demodulating part to thereby output the selected signal to a CRT; a letter information reception detecting part for generating a letter information reception detecting signal to inform that the letter information is received when the letter information is detected from the composite image signals inputted from the image detecting part under an input of a first operation control signal; an automatic switch controlling part for generating the mode conversion signal and applying the signal to the switching part by means of the mode conversion selecting signal; and an automatic switch selection detecting part for sending the mode conversion selecting signal.

Description

Display device for a certain time on initial page when receiving text information

1 is a circuit diagram according to the present invention.

2 is a control flow chart of the microcomputer 1 of FIG.

* Explanation of symbols for the main parts of the drawings

1: Micom 2: Tuner part

3: intermediate frequency amplifier 4: voice processing unit

5: image detector 6: color demodulator

7: Data Slicer 8: Data Processor

9: monitor controller 10: switching unit

11: Character information reception detection unit 12: Automatic conversion selection discrimination unit

13: automatic switching control unit

The present invention relates to a teletext (TTX) receiving apparatus, and more particularly, to an apparatus for displaying initial page information received for a predetermined time when receiving text information.

Teletext, generally called teletext, refers to a broadcasting type information service that selects and displays information needed by a user by collecting information including a simplified diagram on a television broadcast wave. Part of the vertical blanking period is transmitted during television broadcast program broadcast.Teletext receiver (TTX Decoder) and teletext receiver (TTX Decoder) and teletext embedded type are used. Color televisions.

Such conventional teletext receivers are currently "off" when text information is not transmitted from a broadcasting station in a channel for text multicasting, and text multicasting is being performed, or during a text multicasting at a broadcasting station. When the power is "on" in the state to operate by using a light emitting device (LED) or a lamp to inform the viewer that the multi-text broadcasting is in progress.

However, when the light emitting device or the lamp is used as described above, when the received broadcast signal includes noise or when external noise is introduced into the teletext receiver, the light emitting device or the lamp may flicker irregularly and cause confusion to the viewer. In addition, there is a problem in that it does not recognize that the character multiplex broadcast is received if not carefully paying attention to the status of the lamp or semi-luminescent element.

Accordingly, an object of the present invention is to display the text information of the initial received initial page on the CRT (Cathode Ray Tube) for a predetermined time when the text multicast is started while watching a general television program or when the power is turned "on" during the text multicast. The present invention provides an initial page display device at the time of receiving text information that can correctly recognize a viewer that text multicasting is in progress.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a color television with a teletext receiver according to the present invention. In FIG. 1, the tuner unit 2 selects a high frequency broadcasting signal of a frequency band corresponding to a channel selected by an operator from among high frequency broadcasting signals received through an aerial line ANT, and sends it to the intermediate frequency amplifier 3. Output

The intermediate frequency amplifier 3 is connected to the output terminal of the tuner 2 to convert the high frequency broadcast signal output from the tuner 2 to the intermediate frequency by the local oscillation frequency and converts the converted intermediate frequency signal to the line 14. Through the audio processing unit 4 and the image detector 5 is output.

The voice processor 4 connected between the intermediate frequency amplifier 3 and the speaker SP demodulates the intermediate frequency signal output from the intermediate frequency amplifier 3 through the line 14 and is included in the intermediate frequency signal. The voice signal is transmitted through the speaker SP.

The image detector 5 generates a composite image signal by performing secondary frequency conversion on the intermediate frequency signal output from the intermediate frequency amplifier 3 through the line 14 by the reference frequency, and color-codes it through the line 15. Output is made to the grandfather 6, the data slicer 7, and the character information reception detector 11.

The color demodulator 6 is connected between the image detector 5 and the switching unit 10 and is included in the general television during the horizontal scanning period of the composite image signal input from the image detector 5 through the line 15. The color difference signal for the video program is demodulated and output to the switching unit 10 through the line 16.

The data slicer 7 is connected between the image detector 5 and the data processor 8 and is included in the vertical blanking period of the composite image signal input from the image detector 5 through the line 15. By slicing the information signal to a predetermined level voltage, digital code data for character information is generated and output to the data processor 8.

The data processor 8 connected between the data slicer 7 and the monitor controller 9 is controlled by the second operation control signal C2 of the microcomputer 1 and decodes the digital code data output from the data slicer 7. An analog video video information signal with respect to the decoded text information is output to the monitor controller 9.

The monitor controller 9 connected to the switching unit 10 generates a color signal for the character information by synthesizing the video character information signal output from the data processor 8 into a horizontal and vertical synchronization signal and a luminance adjustment signal. Output to the switching unit 10 through (17).

The character information reception detection unit 11 is controlled by the first operation control signal C1 of the microcomputer 1 and the character information signal is output during the vertical blanking period of the composite image signal input from the image detection unit 5 via the line 15. If character information is loaded, the character information reception detection signal So in a constant logic state is outputted to the microcomputer 1.

The microcomputer 1 connected between the character information reception detection unit 11 and the automatic switching selection determination unit 12, when there is an input of the character information reception detection signal So in a certain logical state from the character information reception detection unit 11, In response, the second operation control signal C2 in a constant logic state is output to the data processor 8 to start the operation of the data processor 8.

The microcomputer 1 generally controls and processes the teletax receiving apparatus, the first automatic control signal C1 for operating the text information reception detecting unit 11, and the second operation control signal C2 for operating the data processor 8; A mode selection signal C3 for selectively operating the switching unit 10 in one of the teletext mode and the television mode, the mode switching instructing the automatic switching selection determining unit 12 to switch to the mode according to the present invention. Generates and outputs a selection signal C4. The above mode switching is an index page which is an initial page of character information for a predetermined time by automatically switching to a teletext mode while the current television broadcast is being displayed on the CRT. Displays on the CRT, and then switches back to television mode. At this time, whether to perform the mode switch selection function is set by the user through the automatic switch selection determination unit 12.

The automatic switching selection determination unit 12 determines whether the automatic switching of the mode has been selected by the user in response to the input of the mode switching selection signal C4 in the constant logic state from the microcomputer 1. At this time, when the automatic switching function is selected, the automatic switching selection determination unit 12 transmits the mode switching selection signal C4 to the automatic switching control unit 13, and blocks the automatic switching function when the automatic switching function is not selected. For example, the automatic switching selection determination unit 12 includes an AND gate for outputting the output of the switch operated by the user to select whether to automatically switch the mode and the mode switching selection signal C4. do.

The automatic switching control unit 13 connected between the automatic switching selection determination unit 12 and the switching unit 10 is controlled by the mode switching selection signal C4 in a constant logic state input through the automatic switching selection determination unit 12. In operation, and outputs two bits of mode switching signals Al and A2 to the switching unit 10 through the lines 19 and 20, respectively, according to the logic state of the mode switching selection signal C4. Display the page on the CRT.

On the other hand, the switching unit 10 receives the color difference signal and the color signal respectively output from the color demodulator 6 and the monitor controller 9 through the lines 16 and 17, respectively. At this time, the switching unit 10 outputs the color difference signal to the CRT according to the mode selection signal C3 inputted further from the microcomputer 1 through the line 18 or the mode change signals Al and A2 inputted through the lines 19 and 20. Or output the color signal to the CRT.

Here, the mode selection signal C3 input from the microcomputer 1 through the line 18 controls the switching of the switching unit 10 in the usual case in which the automatic switching function of the television mode / teletext mode according to the present invention is not selected. This is a signal to do.

In addition, in the configuration of FIG. 1, the microcomputer 1, the tuner 2, the intermediate frequency amplifier 3, the audio processor 4, the image detector 5, the color demodulator 6, and the data slicer 7 ), The data processor 8, the monitor controller 9, and the switching unit 10 correspond to a general teletext receiver. However, unlike the general teletext receiving apparatus, the microcomputer 1 and the switching unit 10 are configured to perform other functions in the present invention, and the automatic switching selection determining unit 12 and the automatic switching control unit 13 are added. It is made up.

2 is a control flow diagram of the microcomputer 1 for displaying an initial page on a CRT for a predetermined time upon receiving text information according to the present invention.

Hereinafter, an operation example of the present invention will be described in detail with reference to FIGS. 1 and 2. In the following description, it is assumed that the user selects the automatic switching function according to the present invention for convenience of description. In this case, the automatic switching selection determination unit 12 transmits the mode switching selection signal C4 input from the microcomputer 1 to the automatic switching control unit 13.

First, the microcomputer 1 of FIG. 1 outputs the first operation control signal C1 to the character information reception detection unit 11 in step 100 of FIG. 2 while the power is "on" when the power is "off" or while watching a general television program. The character information means detecting unit 11 is operated. Then, the character information reception detector 11 checks whether the character information signal is loaded during the vertical blanking period among the composite image signals inputted from the image detector 5 through the line 15. At this time, when the character information signal is loaded, the character information reception detection unit 11 further outputs the character information sudity detection signal So to the microcomputer 1. In response to this, the microcomputer 1 outputs the second operation control signal C2 to the data processor 8 in response to step 102 and simultaneously outputs the mode switching selection signal C4 in a constant logic state to the automatic switching selection determining unit 12. do. Accordingly, the data processor 8 starts the drawing, and the automatic switching selection determining unit 12 transmits the mode switching selection signal C4 input from the microcomputer 1 to the automatic switching control unit 13, and then in step 106 Wait for a certain time.

At this time, the automatic switching control unit 13 is operated by the mode switching selection signal C4 input through the automatic switching selection determining unit 12 to switch the mode switching signal A1 of the lower bit having a constant logic state through the line 19. Output as (10). Then, the switching unit 10 is switched to select the color signal for the initial page of the character information output from the monitor controller 9 by the mode switching signal Al to output the color signal output from the monitor controller 9 to the CRT. After that, when the predetermined time elapses, the automatic switching controller 13 outputs the mode switching signal A2 of the upper bit to the switching unit 10 through the line 20. Then, the switching unit 10 is switched to select the color difference signal for the general television video program outputted from the color demodulation unit 6 again by the mode switching signal A2, and outputs the color difference signal output from the color demodulation unit 6 to the CRT. Done.

Therefore, when the multi-text broadcasting is started while watching a general television video program, or the power is turned on in the power-off state of the teletext receiver during the multi-text broadcasting, the initial page of the text information received for a certain time is displayed on the CRT. will be.

Thereafter, the microcomputer 1 waits at step 106 for a predetermined time for which the initial page of the character information is displayed on the CRT as described above, and then terminates after shutting down the mode switch selection signal C4 at step 108. As a result, the normal television broadcast screen starts to be displayed normally.

As described above, according to the present invention, in a teletext receiving apparatus, text information that is received for a predetermined time when a text multicast is started while watching a general television video program or when the power is turned "on" in a power "off" state during a text multicast is in progress. By displaying the initial page on the CRT, there is an advantage that the viewer can recognize exactly that the multi-text broadcasting is in progress.

Claims (1)

In the display device for a predetermined time of the initial page when receiving the text information, by the tuner unit 2 and the tuner unit for selecting a broadcast signal of a constant frequency from among the broadcast signals received through the aerial ANT A frequency signal is converted by frequency conversion of the selected broadcast signal to generate an intermediate frequency signal, and an intermediate frequency signal input from the intermediate frequency amplifier 3 is demodulated to generate a voice signal. An image detector 5 for inputting an audio processor 4 to be transmitted through the video signal, an image intermediate frequency signal further output from the intermediate frequency amplifier 3, and generating a synthesized video signal; and the image detector 5 Character information included in the color demodulation unit 6 for generating a color difference signal for a general television video program and the composite image signal output from the image detection unit 5 during the vertical blanking period. Data character 7 for detecting and outputting the digital code data for the data; and analog character information for the character decrypted by decoding the output digital code data of the data slicer 7 which is operated by input of a second operation control signal. A data controller (8) for generating a signal, a monitor controller (9) for generating a color signal for character information by synthesizing an analog character information signal input from the data processor (8) into horizontal and vertical synchronization and luminance adjustment signals; One of the color difference signal and the color signal input from the color demodulator 6 and the monitor controller 9 is selected by a mode selection signal and outputted to the CRT. A switching unit 10 which selects the output color signal of (9) and selects the output color difference signal of the color demodulator 6 and outputs it to the CRT; Character information reception detection unit 11 which is operated by the input of the fish signal and generates a character information reception detection signal informing that the character information is received when the character information is detected in the composite video signal input from the image detector 5. And control the switching of the switching unit 10 by applying the mode selection signal to the switching unit 10 according to the selection of the television mode / teletext mode, and start text broadcasting while watching a general television video program. And the microcomputer 1 for outputting the first operation control signal and outputting a mode change selection signal in response to the input of the text information reception detection signal when the power is turned "on" relative to the power "off" relative to the text multicasting process. An automatic switching control unit 13 which is operated by a switching selection signal to generate the mode switching signal and applies the switching unit 10 to the switching unit 10, the microcomputer 1 and the automatic switching agent; It is connected between the unit 13, and the automatic switching selection unit 12 for transmitting the mode switching selection signal to the automatic switching control unit 13 when the automatic switching function is selected, and cuts off when the automatic switching function is not selected. Device for displaying a predetermined time of the initial page when receiving the character information, characterized in that consisting of.

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