KR19980051560A - OSD / Caption Data Playback Control Method for Television - Google Patents

Abstract

The present invention simultaneously reproduces OSD / caption data of a television which displays general OSD data that characterizes an internal operation state of a television and caption data extracted from a television broadcast signal into a plurality of block screens, respectively, to enable simultaneous screen reproduction. Provide control method.

Accordingly, the present invention designates a display buffer for caption data processing among the plurality of allocated display buffers 26 and 28, and when the caption display function is executed, the OSD block control register is set as the caption flag to display the inside of the OSD signal processor 30. The caption data according to a predetermined display block is loaded and displayed on the OSD RAM 30A in a display buffer designated for caption, and the OSD block control register is set as an OSD flag to display from the character memory 24 corresponding to the predetermined display block. OSD display data read and stored in a display buffer designated for OSD data processing is loaded into the OSD RAM 30A in the OSD signal processing unit 30 to display the screen.

Description

OSD / Caption Data Playback Control Method for Television

The present invention relates to a method for controlling simultaneous playback of OSD / caption data of a television, and more particularly, to display caption data transmitted from a television broadcast signal and OSD data for displaying an execution state or a setting state of a function operation of a television. The present invention relates to a method for simultaneously controlling playback of OSD / caption data of a television which can be simultaneously reproduced on a screen.

Currently, televisions generally used allow video / audio playback by selecting a predetermined channel among a plurality of television broadcasting signals transmitted from a plurality of television broadcasting stations, and caption data included in the video signals of such television broadcasting. A caption data processing apparatus is provided which allows a caption subtitle having a predetermined display content such as a news subtitle or a guide broadcast of a broadcast program to be displayed on a screen by extracting a signal and processing the signal.

According to a caption data processing apparatus for signal processing such a caption data signal of television broadcasting, the clamp circuit unit clamps the luminance signal Y included in the video signal of television broadcasting to a predetermined level in order to convert it into a digital signal. And a signal converter which converts the clamped luminance signal Y into a digital signal, and receives a clock signal generated by a horizontal synchronization signal Hsync and receives a clock signal generated by a vertical synchronization signal Vsync. A caption data detection unit that detects caption data by generating caption subtitle position signals according to the white level of the caption data, and a caption data extraction unit that extracts only caption data from which image noise components are removed from the detected caption data. A memory for storing the extracted caption data, and the stored caption data in the form of an analog signal; Signal conversion is composed of a signal inversion of the output allowable display.

In a caption data processing apparatus of a television equipped with such a component, when the luminance signal Y clamped by a clamp circuit portion is converted into a digital signal through a signal conversion portion, the digital conversion is performed by the caption data detection portion. Caption data is detected by generating a caption position signal for detecting the position of the caption subtitle by detecting the white level in the luminance data, and the caption data from which the image noise component is removed by the caption data extracting unit is temporarily stored in the memory. Next, a signal is converted into an analog signal through a signal inverse conversion unit and supplied to the video signal processing end.

Also, in such a television, an operation for adjusting an analog level such as volume adjustment of an audio signal, contrast adjustment of a video signal or brightness adjustment, and channel switching or on of a broadcasting channel are performed by a user. When the on / off timer reservation setting is made, an OSD display processing apparatus for implementing the function operation or setting state in the form of On-Screen Display (OSD) display characters on the CRT screen is employed. The apparatus makes it possible to display the caption data extracted from the television broadcast signal by OSD signal processing.

However, in such a television, the OSD display and the caption data are composed of a single place where the OSD display data or caption data is temporarily stored for the signal processing operation of the display characters of the OSD display processing apparatus. If it is necessary to simultaneously display the caption display characters according to the above, after the OSD display data on the screen of the OSD display block is erased from the display buffer, repetitive data erasing and buffering such as buffering the caption data is performed. Since the number of screens of the OSD display block and the screen of the caption data display block is limited, there is a possibility that an error in display processing is inevitably generated by the repeated data exchange processing.

Accordingly, the present invention has been made in view of the above circumstances, and the general OSD data displaying the internal operation state of the television and the caption data extracted from the television broadcasting signal are each formed into a plurality of block screens, and the screen is reproduced simultaneously. It is an object of the present invention to provide a method for simultaneously controlling playback of OSD / caption data of a television.

In order to achieve the above object, according to the OSD / caption data reproducing control method of a television according to the present invention, the display block for caption data processing is designated among a plurality of display buffers assigned to each other, and the caption display function is executed. Set the register as a caption flag to load the caption data according to the predetermined display block in the display buffer designated for the caption in the OSD RAM of the OSD signal processor, and then display the screen by setting the OSD block control register to the OSD flag. OSD / caption data reproduction control method of a television comprising the steps of loading OSD display data read from a character memory according to a block and stored in a display buffer designated for OSD data processing into an OSD RAM in the OSD signal processing unit. To provide.

According to the present invention configured as described above, a display buffer for caption data processing and an OSD display data processing display when a caption data extracted from a television broadcast signal and a OSD display data generated within the television are to be displayed simultaneously. By assigning buffers to each other and setting the flag state of the OSD block control register in the microcomputer to caption flag or OSD flag, caption data corresponding to a predetermined display block from the display buffer for caption data processing is set to OSD in the OSD display processing unit. Repetitive display blocks such as being loaded into the RAM to display the screen by display signal processing, or OSD display data according to a predetermined block in the display buffer for OSD display data processing to be loaded into the OSD RAM to be processed and displayed on the display signal. Caption data and OSD display data are displayed on the video screen by forming the screen. It is possible to display on the screen simultaneously.

1 is a block diagram showing an apparatus for simultaneously controlling OSD / caption data of a television for explaining the method of the present invention;

FIG. 2 is a view showing a storage structure of OSD / caption data of the display buffer shown in FIG. 1 according to a preferred embodiment of the present invention; FIG.

3 is a view showing a flag setting state in a register inside the microcomputer shown in FIG. 1 according to a preferred embodiment of the present invention;

4 is a diagram illustrating an example in which OSD / caption data is simultaneously reproduced on a video screen according to a preferred embodiment of the present invention;

5 is a flowchart showing a control operation according to a preferred embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

2: reception antenna, 4: tuner,

6: image IF unit 8: image amplification unit,

10: video signal processor, 12: video output unit,

14: voice IF unit, 16: voice processing unit,

18: caption extraction unit, 20: caption decoder,

22: display memory, 24: character memory,

26,28: display buffer, 30: OSD signal processing unit,

30A: OSD RAM, 32: Signal conversion unit,

34: function setting section, 36: code data memory,

38: micom.

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

1 is a block diagram showing an apparatus for simultaneously controlling OSD / caption data of a television for explaining the method of the present invention, wherein reference numeral 4 in the apparatus of the present invention selects a predetermined channel from the microcomputer 38, which will be described later. The band channel and the channel tuning data are received to tune the corresponding channel among the plurality of channels induced in the reception antenna 2, and the local oscillation frequency signal generated by the channel tuning data is mixed and output as an intermediate frequency signal. Indicates a tuner to

Also, reference numeral 6 denotes an image IF unit which separates the intermediate image signal from the tuned television broadcast signal and amplifies the intermediate frequency signal, and 8 denotes an image amplification of the intermediate frequency amplified image intermediate frequency signal to a signal level capable of signal processing. An image amplification unit is shown.

In addition, reference numeral 10 denotes the OSD signal processing unit 30, which will be described later by separating the signal-amplified video signal into a luminance signal and a color difference signal, synthesized into a composite image signal through a luminance adjustment operation, and a color demodulation processing operation. And a video signal processing unit for synthesizing the caption data signal or the OSD display signal from the composite video signal and displaying the composite image signal on the video screen. An image output unit for amplifying reproducibly is shown.

Reference numeral 14 denotes an audio IF unit which separates the audio intermediate frequency signal from the television broadcast signal tuned from the tuner 4 and amplifies the intermediate frequency signal. An audio processing unit that performs audio signal processing such as sound quality adjustment and stereo signal processing or audio multiple signal processing, and the like.

Further, reference numeral 18 denotes a caption extracting unit for extracting caption data superimposed on the image signal of the image amplifier 8, and 20 denotes a caption decoder for decoding the extracted caption data so as to display the screen.

Reference numeral 22 denotes a display memory which stores caption data corresponding to the plurality of decoded display blocks and is read by the control data DA and the address ADD from the microcomputer 38 which will be described later. OSD character data for displaying the execution state or setting state of the overall function operation assigned to the television in the form of OSD display characters is stored, and the control data DA and the address ADD from the microcomputer 38 to be described later. Indicates a character memory to which OSD character data constituting a display block for screen display of a predetermined menu screen is read.

Reference numeral 26 denotes a first display buffer which is designated for caption data processing by the microcomputer 38 to be described later and buffers other caption data in a predetermined display block from the display memory 22, and 28 is described later. A second display buffer designated by the microcomputer 38 for OSD data processing and configured to buffer OSD character data constituting a predetermined display block from the character memory 24 is buffered.

As shown in FIG. 2, the first and second display buffers 26 and 28 are each composed of 32 bytes for the first display buffer 26 to store display blocks according to two caption data. A storage area of the first and second caption blocks, the second display buffer 28 being a storage area of the first and second OSD blocks each having 32 bytes for storing the display blocks according to the two OSD display data. It is composed.

Reference numeral 30 denotes caption data corresponding to a predetermined display block by repeatedly accessing the first display buffer 26 and the second display buffer 28 by control data DA from the microcomputer 38 to be described later. An OSD signal processing unit which stores OSD display data in its own OSD RAM 30A and displays the image on a video screen by processing the display signal, and 32 indicates caption data or OSD display data processed by the display signal. The signal converter outputs the analog signal to the video signal processor 10.

Also, reference numeral 34 denotes a matrix button portion provided in a predetermined portion of the remote control unit for remote control or the main body of the main body, and has a caption display function for screen display of caption data extracted from a television broadcast signal and OSD display data consisting of a predetermined menu screen. The function setting section for key setting the execution status is shown.

Reference numeral 36 denotes a code data memory storing the character code and color code extracted from the caption data and storing the character code and color code for displaying the OSD display data, and 38 denotes the function setting unit 34. Caption data extracted from the television broadcast signal and OSD display data constituting a predetermined menu screen are simultaneously displayed on the video screen according to the execution of the caption display function by the caption caption flag assigned to its own OSD block control register. In addition to setting the flag and the OSD flag, the microcomputer generates caption data from the code data memory 36, control data DA and address ADD by character code and color code according to the OSD display data.

Here, the OSD block control register inside the microcomputer 38 has an off-flag A having a zero value when the caption data and the OSD data display function are not executed, as shown in FIG. And a caption flag (B) having a value set for screen display, a first OSD flag (C) set for screen display of OSD display data, and a second OSD flag (D).

Next, the operation of the present invention made as described above will be described in detail with reference to the flowchart of FIG. 5.

First, in step 40, a predetermined channel is tuned through the tuner 4, and the image signal is amplified by the image intermediate frequency through the image IF unit 6, so that the signal amplification of the image amplifier 8 and the image signal processing unit 10 are performed. In the state where the image is reproduced on the image screen through the amplification of the image output unit 12 through the image signal processing, the microcomputer 38 resets the display memory 22 to initialize the memory state and then the caption extracting unit 18. The caption data extracted through the caption decoder 20 and decoded by the caption decoder 20 is stored as, for example, the first and second display blocks, and the process proceeds to step 41 so that the caption data from the display memory 22 is displayed on the screen. The first display buffer 26 is designated among the first and second display buffers 26 and 28 for temporary storage.

The microcomputer 38 then proceeds to step 42 and determines whether the function setting unit 34 sets the caption display function for simultaneously displaying the caption data and the OSD display data.

As a result of the determination in step 42, when it is determined that the function setting unit 34 is setting the caption display function, the control proceeds to step 43 to display caption data according to the predetermined display block stored in the display memory 22. Determines whether to display on screen.

As a result of the determination in step 43, if it is determined whether to display the caption data according to the predetermined display block according to the caption display function, the control proceeds to step 44, and the caption having a value of 1 in the OSD block control register in the self is determined. The flag B is set, and the process proceeds to step 45 to determine whether or not to display the first display block from the caption data of the first and second display blocks stored in the display memory 22.

As a result of the determination in step 45, if it is determined that the caption data according to the first display block of the display memory 22 is to be displayed on the screen, then the control proceeds to step 46 in accordance with the caption data from the code data memory 36. The control data DA and the address ADD according to the character code and the color code are output to the display memory 22 so that the caption data according to the first display block is buffered through the first display buffer 26 and the OSD signal processing unit ( As shown in FIG. 4, the first caption display item G according to the first display block is displayed on the screen by being loaded into the OSD RAM 30A of FIG.

However, if the determination in step 45 determines that the screen is to display other caption data on the second display block of the display memory 22, then the control proceeds to step 47 to set the flag of the OSD block control register in the first value to one value. The control data DA and the address ADD for the character code and the color code according to the caption data of the second display block from the code data memory 36 and the address ADD. 4), the caption data according to the second display block is buffered through the first display buffer 26, loaded into the OSD RAM 30A of the OSD signal processor 30, and then the display signal is processed. As shown, the second caption display item H according to the second display block is displayed on the screen.

On the other hand, if it is determined in step 43 that the caption display function is not in the screen display state of the caption data, the control proceeds to step 48 to determine whether or not to display the OSD display data.

As a result of the determination of step 48, if it is determined that the microcomputer 38 is in a state for displaying the OSD display data, the control proceeds to step 49 where the first display block is displayed among the OSD display data of the first and second display blocks. It is determined whether or not to display the OSD display data according to the screen.

As a result of the determination in step 49, if it is determined that the OSD display data according to the first display block is to be displayed on the screen among the OSD display data of the first and second display blocks, the control proceeds to step 50 to control the OSD block. The flag of the register is set to the first OSD flag C or the second OSD flag D having a value of 10 or 11, and the control data according to the character code and color code according to the OSD display data from the code data memory 36 ( The OSD character data generating the DA and the address ADD in the character memory 240 and constituting the OSD menu screen according to the first display block are read and buffered in the second display buffer 28, and then the OSD signal processing unit ( By being stored in the OSD RAM 30A of FIG. 30 and processing the display signal, as shown in FIG. 4, the first OSD display item E according to the first display block is displayed on the screen.

However, if it is determined in step 49 that the OSD display data according to the second display block is to be displayed on the screen among the first and second display blocks, the control proceeds to step 51, and the flag of the OSD block control register is set to 10. Or the first OSD flag C or the second OSD flag D having an eleven value, and the control data DA and the address ADD based on the character code and color code according to the OSD display data of the code data memory 36. ) OSD character data constituting the second display block is read and buffered in the second display buffer 28 and stored in the OSD RAM 30A of the OSD signal processor 30. As the display signal is processed, the second OSD display item J according to the second display block is displayed on the screen as illustrated in FIG. 4.

On the other hand, if it is determined that the display of the other OSD display data is not displayed on the OSD display block even in the determination result of step 48, the control proceeds to step 52 to turn off the flag of the OSD block control register in itself. By setting the flag A to stop the OSD signal processing operation of the OSD signal processing unit 30, the off display item F in which caption data or OSD display data is not displayed as shown in FIG. , I) so that the video signal of the television broadcast tuned from the tuner 4 can be reproduced normally.

Therefore, according to the present invention having the above-described embodiment, as shown in Fig. 4, the first and second caption display items G and H and the first and second caption display items G and H on which the caption data according to the first and second display blocks are displayed are displayed. The effect of simultaneously displaying the first and second OSD display items E and J on which the OSD display data according to the first and second display blocks is displayed on the screen is generated.

According to the present invention made as described above, the display buffer for caption data processing and OSD display data processing separately configured in the television, caption data and OSD display data each having a plurality of display blocks are simultaneously displayed on the video screen. As the screen can be displayed, the OSD display data and the caption data can be stabilized on the screen, and caption data for the plurality of display blocks and the OSD display data can be simultaneously displayed.

Claims (2)

If a caption data processing display buffer is designated among the plurality of allocated display buffers 26 and 28, and the caption display function is executed, the OSD block control register is set as the caption flag to display the OSD RAM 30A in the OSD signal processing unit 30. Loads caption data according to a predetermined display block in the display buffer designated for the caption and displays it on the screen, and then sets the OSD block control register as an OSD flag and reads it from the character memory 24 according to the predetermined display block. And loading the OSD display data stored in the display buffer designated for the display into the OSD RAM (30A) of the OSD signal processing unit (30) to display the screen. A plurality of display buffers 26 and 28 designated for caption data processing and OSD display data processing respectively store four display blocks each consisting of 32 bytes to store two display blocks. OSD / Caption data simultaneous playback control method for a television, characterized in that the area is allocated.