KR20000041984A - Method for displaying automatically caption in television - Google Patents

Abstract

PURPOSE: A method for displaying automatically caption in television is provided to display automatically caption broadcasting from broadcasting received through a specific channel. CONSTITUTION: A method for displaying automatically caption in television comprises the steps of: determining whether a received broadcasting signal is a caption broadcasting signal; reading a caption-on count value from an inner memory and determining whether it is more than a reference value if the caption broadcasting; switching a current status to a caption-on status if the caption-on count value is higher than the reference value; determining whether a caption-on key is selected if the caption-on count value is less than the reference value; and increasing the caption-on count value of a channel as much as 1 and switching the current status to the caption-on status if the caption-on key is selected.

Description

A automatically caption displaying method in a television

The present invention relates to a caption automatic display method for a television having a caption broadcast reception function. Specifically, when a particular channel is watched with a caption on for a predetermined number of times or more, the caption broadcast is automatically received if the broadcast received from the channel is caption broadcast. The present invention relates to a caption automatic display method for a television to be captioned on.

Recently, when a broadcasting station carries a text signal corresponding to an audio signal in a broadcasting station for a hearing impaired person, for example, during a news broadcast or a movie broadcasting, the decoder unit of the television decodes only the text signal from the broadcast signal, and then displays it on the CRT screen. Caption broadcasting is used to appear as subtitles.

In the caption broadcasting system, text information is transmitted during the vertical blanking period, that is, 21H (where H is one horizontal scanning period), which is a period during which no image is displayed among the transmission signal waveforms of one field. The text information is an NRZ signal formatted in NRZ (None-Return to Zero) format. During 1H (Line) period, the run-in clock, which is necessary to match the color burst, erase level, broadcast signal and the clock of the receiver, Character information (data block) is included.

The caption broadcast signal configured as described above is superimposed with a general video signal, and then a radio wave modulated by the video signal and the audio signal amplitude modulated by the superimposed composite video signal is transmitted from a television transmitter of a broadcasting station.

The broadcast signal transmitted as described above is tuned by the tuner unit 50 of the television as shown in FIG. 1 and passes through the IF detector 60 to detect an intermediate frequency among the broadcast signals, and the P / S separation unit 70. The audio intermediate frequency signal SIF and the image intermediate frequency signal PIF are separated from each other.

The voice intermediate frequency signal SIF output from the P / S separation unit 70 passes through the voice detector 80 and the voice signal S is detected, and the voice processor 90 undergoes a predetermined process. The image intermediate frequency signal PIF output through the speaker 100 and output from the P / S separation unit 70 passes through the image detector 34 to detect the image signal P, thereby processing the image processor 120. ) Is output to the CRT 140 through a predetermined process.

In this case, when the user selects the caption key of the remote controller 20 or the key panel 10, the microprocessor 40 recognizes the caption key and outputs a control signal for driving the caption decoder 160. Accordingly, the caption decoder 160 extracts and decodes only the caption signal from the image signal output from the IF detector 60, and outputs the decoded caption signal to the CRT 140 by a predetermined amount. As a result, a caption corresponding to the caption signal is formed on the screen of the CRT 140.

On the other hand, there is a caption broadcasting channel automatic display device of the Republic of Korea Patent Publication No. 97-9456, which solves the disadvantage that the television having such caption broadcasting reception function is not known the broadcasting channel to which the caption broadcasting is currently output.

When the caption channel auto search mode is selected from the key input means by caption processing means and OSD (On Screen Display) means, the channel that contains caption broadcasting data is automatically searched for a predetermined time interval from the first channel to the last channel. In this way, the caption broadcasting channel is detected and the caption broadcast is displayed on the CRT screen in the detected order so that the user can easily select the caption broadcasting.

However, the above-described conventional television with a caption function has a troublesome problem because the user must set the caption on / off.

The present invention has been made to solve the above-described problems, and when a specific channel is watched in a caption-on state for a predetermined number of times or more, when a caption signal is detected from a received broadcast signal, the caption-on state is automatically switched on. Disclosed is a method for automatically displaying captions in a television that outputs caption characters on a CRT screen.

1 is a block diagram illustrating a television having a general caption function.

2 is a flowchart illustrating an automatic caption display process according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: key input unit 110: microprocessor

120: tuner 130: image signal processing unit

140: OSD unit 150: switching unit

160: CRT 170: character signal decoder

190: voice signal processing unit 200: speaker

210: EEPROM

In the caption automatic display method according to the present invention, a process of determining whether a caption is broadcast is received from a received broadcast signal, and if caption broadcast, a process of determining whether a caption on count value is read from an internal memory and then the reference value is greater than the caption on count value. If it is above the reference value, the process of automatically switching to the caption on state, if the caption on count value is less than the reference value, determining whether the caption on key is selected, and if the caption on key is selected, increases the caption on count value of the channel by one. The process of storing and then switching to the caption on state.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

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

Fig. 1 is a block diagram of a television adopted in accordance with the present invention, which has the same configuration as a television having a conventional caption broadcasting function.

That is, the key panel 10, the remote controller 20, the remote controller key signal input unit 30, the microprocessor 40, the tuner unit 50, the IF detector 60, the P / S separator 70, and the voice. Composed of a detector 80, a voice processor 90, a speaker 100, an image detector 110, and an image processor 120, an OSD unit 130, a CRT 140, and a caption decoder 160. do.

In such a configuration, the key panel 10 or the remote controller 20 is an input means for operating the television, such as caption on / off, volume up / down key for volume adjustment, predetermined key for adjusting image quality (menu key). And a plurality of keys including the image quality control key, direction key, numeric key), key for sound quality setting, and key for image quality setting, and output a key signal corresponding to the user's key operation. The remote controller 20 is capable of transmitting a key signal corresponding to a key operation on an infrared carrier, and the remote controller key signal input unit 30 provided in the television body demodulates, detects, and amplifies the received infrared carrier. To the microprocessor 40.

The microprocessor 40 controls the overall operation of the television based on the key signal from the key panel 10 or the remote controller 20, and in particular, determines whether to output the caption data detected by the caption decoder 160. do.

The tuner unit 50 outputs a broadcast signal received by being tuned to a channel corresponding to the control of the microprocessor 40.

Meanwhile, the voice processing unit 90 is a signal capable of outputting a voice signal received by the tuner unit 30 and applied through the IF detector 60, the P / S separation unit 70, and the voice detector 80. Processed and output to the speaker 100, and adjusts the volume of the output under the control of the microprocessor (40).

The image processor 120 processes the image signal received from the tuner unit 30 and applied through the IF detector 60, the P / S separation unit 70, and the image detector 110 into a displayable signal, thereby providing a CRT. Output to 140.

In addition, the OSD unit 130 is a character screen display means for synthesizing an OSD text signal corresponding to the control of the microprocessor 40 to an image signal output from the image processor 120 and outputting the synthesized OSD text signal to the CRT 140. But not the timing unit that determines the horizontal / vertical position of the OSD, the character ROM to save and export the OSD text font, the ROM to store the program to control the OSD text display, and the program to control the OSD text display control. And a display generator for controlling the display of the OSD characters based on a control signal for OSD character size conversion and OSD character type selection from the microprocessor 40 and outputting an RGB signal and a vertical blanking signal for displaying the corresponding characters. do.

The caption decoder 160 extracts the caption signal from the broadcast signal under the control of the microprocessor 40 and outputs the caption signal to the CRT 140 in the form of a caption.

Next, a description will be given in detail with reference to the flowchart of FIG. 2 attached to a caption automatic display method in a television according to a preferred embodiment of the present invention in a television having the above-described configuration.

The microprocessor 40 controls each component of the television to receive television broadcast at the channel and volume last selected before there was a new keystroke when the television was switched on from standby.

In addition, if the received broadcast is a caption broadcast, the following steps are performed at regular intervals to automatically display the caption.

First, the microprocessor 40 determines whether the received broadcast is a caption broadcast (S100). The caption broadcast is determined based on the signal input from the caption decoder 160. The caption decoder 160 notifies the caption signal when a caption signal is detected in the vertical retrace section of the broadcast signal input from the IF detector 60. FIG. The signal is output to the microprocessor 40.

If it is determined that the received broadcast is not a caption broadcast, there is no need for automatic caption display according to the present invention.

However, if it is determined that the caption broadcast, the caption on count value of the broadcast channel received from the internal memory is read (S110).

It is determined whether the caption on count value is greater than or equal to the reference value (S120).

The caption on count value is a count of the number of times a user selects the broadcast of the channel selected by the user in caption-on, that is, a closed captioned screen. If the value is equal to or greater than this reference value (for example, 10 times), the hearing impaired person watches television. Or watching television for learning a foreign language.

If it is determined that the caption on count value is less than the reference value, it is determined whether the user selects the caption on key from the remote controller 10 or the key panel 10 (S130). As a result of determination, when the caption on key is selected, the caption on count value of the current broadcast channel is increased by 1 and stored in the internal memory, and the caption decoder 160 is controlled by converting the caption on state to the caption character CRT 140. To be output to (S140, S150)

As a result of the determination in step S120, if the caption on count value is greater than or equal to the reference value, that is, when a user (mainly a deaf or foreign language learner) frequently watches television while the caption is on, the process proceeds to step S150 and automatically switches to the caption on state. The control signal is output to the caption decoder 160 to output the caption character to the CRT 140.

While the invention has been shown and described with respect to particular embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention as set forth in the claims. Anyone can see it easily.

As described above, in the present invention, especially when a user who needs a caption broadcast, such as a hearing impaired user, watched with the caption on above a reference value, the caption text is automatically received when the caption broadcast is received even if the user does not select the caption on key. By outputting the CRT on the CRT, the user's convenience is increased by eliminating the inconvenience of having to operate a key to check whether the caption is broadcast whenever the channel is changed or the broadcast program is changed.

Claims (1)

Determining whether the caption broadcast is received from the received broadcast signal; and if caption broadcast, reads the caption on count value from the internal memory, and then determines whether the caption on count value is greater than or equal to the reference value. When the caption on key value is less than the reference value, determining whether the caption on key is selected, and when the caption on key is selected, increases the caption on count value of the channel by one, and then switches to the caption on state. Caption automatic display method in a television comprising a process.