KR19980021448U - Caption data processing device of TV that can receive satellite broadcasting - Google Patents

Abstract

The present invention relates to a caption data processing apparatus of a television capable of receiving a satellite broadcast, comprising a first RF tuner 106 for tuning an airwave channel and a second RF tuner 116 for tuning a satellite broadcast channel. Remote control 102 for designating a screen display of caption data contained in the digital data stream of the channel tuned by the second RF tuner 116 in a television capable of reception of the second RF tuner 116, and the caption data of the remote control 102. The microcomputer 104 controls the screen display of caption data when designating the screen display, and extracts caption data from the video signal of the second RF tuner 116 to the microcomputer 104 under the control of the microcomputer 104. A decoder 118 and an OSD processing unit 122 for generating a text signal of caption data and applying the image signal to the image processing means 112 and 114 under the control of the microcomputer 104. .

Description

Caption data processing device of TV that can receive satellite broadcasting

The present invention relates to a caption data processing apparatus of a television capable of receiving satellite broadcasting. More specifically, when closed data is included in a digital data stream and is transmitted, the caption data is extracted by a built-in decoder and displayed on the screen. The present invention relates to a caption processing apparatus for a television capable of receiving satellite broadcasting.

As is well known, a video signal transmitted from a broadcasting station to which an airwave channel is allocated includes transmission of caption data or caption data correlated to a scene of a subsequent video signal or transmission of specific caption / caption data irrelevant to the video signal scene. Such subtitles or caption data are automatically reproduced and displayed on a television which reproduces an over-the-air broadcast signal, or reproduced and displayed upon selection of a screen display function by, for example, a remote control.

Typically, such caption data or caption data is included in the video blanking section defined in the vertical retrace period of the video signal and transmitted. Thus, a function of separating and extracting only the caption or caption data on a television is provided. Will be.

In recent years, satellite broadcasting has been focused on realizing high quality and high quality video / audio signals for astigmatism through satellites.

According to such satellite broadcasting, when a variety of information data or broadcast program data is edited and transmitted from a broadcasting station or a program / data signal source by an information server to the transmitting earth station, the information earth or satellite is transmitted from the transmitting earth station toward the satellite. The satellite transmits the program data, and the satellite relays the information data or the program data toward a receiver called a 'set-top box' which has a satellite broadcasting antenna and decodes the satellite broadcasting. The information data and / or broadcast program data decoded by the receiver are transferred to a dedicated data receiving terminal, a television, or a VCR to be reproduced / recorded.

Typically, a program service by satellite broadcasting is composed of one video signal, up to four audio signals, and caption data (or subtitle data) carried on the twenty-first line of the first field in the NTSC video signal.

FIG. 1A is a diagram illustrating an exemplary configuration of an apparatus for extracting caption data included in a satellite broadcasting program additionally provided in a satellite broadcasting receiver.

In FIG. 1, reference numeral 1 denotes a signal extraction unit for extracting and defining a level of a signal by removing an AC component and a DC component from a caption data signal Sin of the satellite broadcasting program illustrated in FIG. 1) is connected in series between the rear end of the resistor 1a and the first capacitor 1b for removing the AC component of the signal Sin (see FIG. 1B) between the rear end of the resistor 1a and the ground potential. And a second capacitor 1c for removing the DC component of the signal.

2 denotes a clamp unit for clamping the signal from the signal extraction unit 1 to a constant level, and 3 denotes a synchronization signal slicer for slicing the clamped signal in the clamp unit 2 to detect a synchronization signal. 4 denotes a data clock restoration unit for restoring a data clock (see FIG. 1B) for data restoration on the basis of the synchronization signal detected by the synchronization signal slicer 3. FIG.

In addition, 5 represents a data slicer for extracting caption data by slicing the clamped signal from the clamp unit 3, and 6 represents the data slicer 5 based on the data clock applied from the data clock restore unit 4. Indicates a data restoring unit for restoring and capturing the caption data.

Therefore, according to the above configuration, the signal Sin illustrated in FIG. 1B is removed from the first capacitor 1b through the resistor 1a and the DC component from the second capacitor 1c. A signal applied to (2) and clamped to a constant level in the clamp unit 2 is detected by a synchronization signal slicer, and the data clock restoration unit 4 restores caption data based on the synchronization signal. The data clock for recovering is applied to the data restoring unit 6. Therefore, the data restoring section 6 restores the caption data applied by the data slicer 5 based on the data clock and applies it to be post-processed and displayed on the image processing means of the television, for example.

However, in order to extract caption data included in a signal of a satellite broadcasting program and display it on a screen of a television, an additional hardware configuration illustrated in FIG. 1A is required for a receiver that receives and decodes a satellite broadcasting program transmitted from a satellite. Since the caption data decoded by the additional hardware configuration is transmitted to the television and post-processing is performed, dual signal processing of the satellite broadcast receiver and the television must be performed.

The present invention has been made in view of the above-described circumstances, and a built-in decoder means for decoding caption data included in a satellite broadcast signal is provided on a television capable of receiving satellite broadcast so that the caption data decoded by the decoder means can be directly displayed. The purpose of the present invention is to provide a caption data processing apparatus for a television capable of receiving satellite broadcasting.

In order to achieve the above object, according to a preferred example of the present invention, a television having a first RF tuner for tuning of an airwave channel and a second RF tuner for tuning of a satellite broadcasting channel, the television capable of receiving a satellite broadcasting program, Mode designation means for designating the screen display of caption data contained in the video signal of the channel tuned by the second RF tuner, and control of the screen display of caption data when designating the screen display of caption data by the mode designation means; Control means, decode means for extracting the caption data from the image signal of the second RF tuner under the control of the control means and applying to the control means, and generates a text signal of the caption data under the control means of the image processing means OSD processing means for applying to the control means, the control means for extracting the caption data extraction result Provided is a caption data processing apparatus of a television capable of receiving a satellite broadcast which applies R / G / B data to the OSD processing means so that a text signal is generated and displayed on a CRT apparatus.

According to the caption data processing apparatus of a television capable of receiving satellite broadcasting according to the present invention having the above-described configuration, when the screen display mode of caption data is designated by the mode designation means, the control means controls the caption data screen display in the decoder means. The R / G / B signal is applied to the OSD processing means on the basis of the extracted caption data, so that the text signal generated by the OSD processing means is reproduced by the image processing means and displayed on the CRT apparatus.

1A and 1B are diagrams illustrating a configuration of a caption data processing apparatus and a signal waveform of caption data according to a conventional example;

2 is a view illustrating a satellite broadcasting system including a television equipped with a caption data processing apparatus according to the present invention;

3 is a block diagram of a television including a caption data processing apparatus according to the present invention;

4 is a flowchart illustrating the operation of the caption data processing apparatus of a television capable of receiving satellite broadcasts according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: program / data signal source, 20: transmitting earth station,

30: satellite, 40: television,

50: smart card, 60: resource / subscriber management system,

70: PSTN / PSDN, 102: remote control,

104: micom, 116: second RF tuner,

118: decoder, 120 image conversion unit,

122: OSD processing unit.

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

2 is a block diagram showing a schematic configuration of a satellite broadcasting system including a television equipped with a caption data processing apparatus according to the present invention.

In the figure, reference numeral 10 denotes a program / data signal source, for example, as a broadcasting station or an information data server, which collects and edits broadcast programs and / or information data programs applied to satellite broadcasting in a predetermined broadcast order. .

20 denotes a transmission earth station for transmitting the broadcast program and / or information data program edited in the program / data signal source 10 to a receiving side, and 30 denotes a broadcast program and / or information transmitted from the transmission earth station 20. A satellite for relaying a data program to a receiver is shown, and 40 represents a television for receiving and reproducing a broadcast program and / or an information data program relayed via the satellite 30. For the television 40, In order to receive a broadcast program and / or information data program transmitted from the satellite 30, for example, a parabolic antenna (not shown) is connected and a satellite broadcast decoder to be described later is included.

In addition, in FIG. 1, reference numeral 50 denotes a channel detachably provided to the television 40 so as to allow reception and reproduction only for a specific subscriber among broadcast programs received by the television 40 (Pay-per-). View shows a smart card that is applied to the processing of protocols and charge calculation for program reception permission.

In addition, 60 denotes a resource / subscriber management system that is responsible for calculating a fee or transmitting a broadcast program and / or data program required by a specific subscriber identified by the smart card 50, and managing a specific subscriber. Indicates.

70 is provided between the television 40 and the resource / subscriber management system 60 to process a request for a program transmission service based on a protocol included in the smart card 50 mounted on the television 40. Or a public switched telephone network (PST) or a public switched data network (PSDN) as a public communication network or a dedicated communication network in charge of communication processing for resource / subscriber management by the resource / subscriber management system 80.

Here, the smart card 50 is a broadcast program provided from the program / data signal source 10 in a state in which channel descrambling permission information is normally distributed under the involvement of the resource / subscriber management system 60, in particular, commercial When selecting a channel for a pay-per-view or information data program, the usage information is updated, and the usage information is transmitted to the resource / subscriber management system through the PSTN / PSDN 70. In step 60), update processing of the corresponding subscriber profile is performed.

FIG. 3 is a schematic block diagram of a satellite broadcasting television equipped with a caption data processing apparatus according to the present invention shown in FIG. 2.

That is, in the drawing, 102 denotes a remote controller for remote control of the overall function of the television 40 with the corresponding satellite broadcast receiving function, and the remote controller 102 selectively selects satellite broadcast or conventional airwave broadcasting. Specify the mode for displaying the functions such as setting of functions for viewing, channel tuning of satellite broadcasting or normal air broadcasting, and providing, for example, broadcast program guide information or caption data, which are provided as additional service information when a satellite broadcasting program is received. Will be equipped.

104 is responsible for the overall control of the television 40 capable of receiving the satellite broadcast in response to the remote control signal transmitted from the remote control 102, and for example, controlling the screen display of the caption data included in the satellite broadcast program. For the microcomputer 104, the microcomputer 104 is provided with a data memory 104a in which channel tuning data applied to a satellite broadcasting channel or an airwave broadcasting channel is selected. In addition, 106 denotes a first RF tuner that outputs an IF (Intermediate frequency) converted audio IF signal and an image IF signal by selecting a channel of an airwave broadcasting program according to the channel selection signal CH1 applied from the microcomputer 104. 108 and 110 are audio processing units for reproducing voice IF signals applied by the first RF tuner 106 and reproducing voice signals of satellite broadcasting programs, and audio signals reproduced by the voice processing unit 108. A voice output section for outputting to be reproduced by an output device (speaker).

112 and 114 are image processing units for reproducing the video IF signal applied by the first RF tuner 106 and reproducing the video signal of the satellite broadcasting program, and the video signal reproduced by the video processor 112. An image output unit for outputting to a video output device (CRT device) for playback.

In addition, in FIG. 2, reference numeral 116 denotes that the microcomputer receives the satellite broadcasting program provided through the satellite 30 from the program / data signal source 10 shown in FIG. 1 through a parabolic antenna (not shown). A second RF tuner that tunes a channel for the satellite broadcast program based on the channel tuning signal CH2 applied at 104.

118 denotes a decoder for decoding the signal of the satellite broadcast program provided by the second RF tuner 116, the decoder 118 preferably being a satellite broadcast program received via a satellite (30 in FIG. 1). It is configured to perform a function similar to the well-known 'set-top box' to decode the video signal, audio signal and caption data, and to apply the extracted caption data to the microcomputer 104 to the microcomputer 104 The playback process is executed under the control of.

120 denotes an image converter which converts the video signal decoded by the decoder 118 into an NTSC video signal (R / G / B signal) and applies the image signal to the image processor 112. Further, 122 denotes a text OSD signal corresponding to a function or mode for a television with a satellite broadcasting reception function set by the remote controller 102 or caption data (R / G / B signal data) from the microcomputer 104. To generate an OSD and apply it to the image processor 112.

When the smart card 50 is installed, the smart card 50 processes the protocol of the smart card 50 and applies it to the microcomputer 104 to control reception of a commercial channel under the control of the microcomputer 104. An interface for interfacing a viewer's request for transmission of a broadcast program to the PSTN / PSDN 70 is shown.

Next, the operation of the caption data processing apparatus of the television capable of receiving satellite broadcasting according to the present invention of the above-described configuration will be described in detail.

First, when a broadcast program organized in a program / data signal source 10 as a broadcasting station or information data server is delivered to the transmitting earth station 20, the transmitting earth station 20 faces the satellite 30 toward the satellite 30 and / or The information data program is transmitted, and the satellite broadcast program relayed by the satellite 30 is received through a parabolic antenna connected to the television 40, and the decoding process is performed on the television 40.

That is, when a remote control signal is received from the remote controller 102 in step 200, the microcomputer 104 determines whether the remote control signal is a signal for setting a mode for receiving a satellite broadcast program in step 202.

As a result of the determination, if the remote control signal is not a mode setting signal for receiving a satellite broadcasting program (NO in step 202), the microcomputer 104 proceeds to the control procedure to step 204 to reproduce the broadcast signal of the airwave channel. Will be processed.

That is, when the remote control signal for tuning the airwave channel is input from the remote controller 102, the microcomputer 104 reads the channel tuning voltage CH1 to be tuned from the data memory 104a and the first RF tuner 106. The audio / video signal of the airwave channel tuned by the first RF tuner 106 and IF-converted is applied to the corresponding audio processing unit 108 and the image processing unit 112 to be reproduced. Subsequently, the reproduced audio / video signal is transmitted to the speaker device and the CRT display device through the audio output unit 110 and the image output unit 114 to be reproduced and output.

On the other hand, when the satellite broadcasting reception mode is set as the determination result in step 202 (that is, 'YES' in step 202), the microcomputer 104 determines that the smart card 50 if the channel of the selected satellite broadcast is a normal channel. While the playback process of the broadcast program is performed without passing through the reception permission processing by the receiver, if the selected channel is a commercial channel (ie, a paid channel), the smart card 50 of the smart card processing unit 124 is processed. In addition to determining the allowance of descrambling for the channel based on the usage information, information on the usage state of the smart card 50 is interfaced by the interface 126 to the PSTN / PSDN 70 side so that the resource can be accessed. The renewal processing of the smart card 50 by the subscriber management system 60 is executed.

After execution of such processing, the microcomputer 104 proceeds to step 206 to read the preset voltage CH2 corresponding to the channel selected by the remote controller 102 and apply it to the second RF tuner 116, The OSD processor 122 is controlled to generate an OSD signal corresponding to a channel number for tuning of the satellite broadcasting program and to be applied to the image processor 112.

Then, the decoder 118 decodes and outputs the video signal Vbs and the audio signal Abs from the IF signal of the IF program.

The audio signal Abs decoded by the decoder 118 is applied to the audio processor 108 to be reproduced, and the video signal Vbs is NTSC video signal R by the image converter 120. / G / B signal) is applied to the image processing unit 112 and reproduced.

In such a state, the microcomputer 104 determines whether the screen display of caption data is designated from the remote controller 102 in step 208, and the image by the decoder 118 in step 210 when the screen display of caption data is designated. The R / G / B signal is generated based on the caption data extracted from the 21st line of the first field of the signal and applied to the OSD processor 122.

Accordingly, the text OSD signal of the caption data generated by the OSD signal processing unit 122 is applied to the image processing unit 112 in step 212 and synthesized with the image signal, and then the CRT apparatus (shown through the image output unit 114). On the screen).

In addition, the microcomputer 104 determines whether the display of the caption data is released by the remote controller 102 or the display of the caption data by the completion of transmission of the caption data is completed in step 214. The display ends.

As described above, according to the caption data processing apparatus of a television capable of receiving satellite broadcasting according to the present invention, the caption data transmitted in the satellite broadcasting program is extracted by a decoder built into the television, and then the extracted caption data is extracted. By generating an OSD signal and displaying the screen, not only the data slice process by a separate hardware configuration for extracting caption data can be excluded, but also the process for reproducing the caption data can be simplified.

Claims (1)

In a television capable of receiving a satellite broadcasting program, having a first RF tuner 106 for tuning an airwave channel and a second RF tuner 116 for tuning a satellite broadcasting channel, A remote controller 102 for designating a screen display of caption data included in a video signal of a channel tuned by the second RF tuner 116; A microcomputer 104 for controlling the screen display of caption data when the screen display of caption data is designated by the remote controller 102; A decoder 118 extracting caption data from the video signal of the second RF tuner 116 and applying the caption data to the microcomputer 104 under the control of the microcomputer 104; And a OSD processing unit (122) for generating text signals of caption data and applying them to the image processing means (112, 114) under the control of the microcomputer (104).