JP4215724B2 - Digital broadcast subtitle transmission system and subtitle superposition method - Google Patents

Description

The present invention relates to a subtitle sending system and subtitle superimposing method for digital broadcasting.

  In recent years, the introduction of multifunctional digital broadcasting has been advanced in place of conventional analog broadcasting. In particular, teletext broadcasting is used in various formats such as simulcasting as well as conventional screen captions. However, as for the broadcast use of the current character, the broadcast signal is also used in the state of various combinations of the program source and display such as the caption of analog broadcast, high definition screen and subtitle broadcast.

  A broadcasting station employs a method in which a broadcast signal is input / output between subsystems in a studio by combining a video SDI (Serial Digital Interface) signal and ANC data (Ancillary Data: auxiliary information). Conventionally, first, when the caption signal is output independently from the caption transmission device as the caption signal source, secondly, when there is a combination of the SDI signal and the ANC data from a device such as a VTR, the third In addition, for example, an input signal having three different input conditions is handled, such as a video signal in which character data is analog-superimposed on an NTSC format analog video signal. Furthermore, since terrestrial analog broadcasting is still used by the majority of viewers, the caption characters of analog broadcasting are extracted and digital character information of HD (high definition, high definition) or SD (standard definition) television. There are also cases where troublesome processing such as recreating subtitle information is performed for digital broadcasting such as conversion to SDI and superimposing on an SDI signal (for example, Patent Document 1 and Non-Patent Document 1).

Conventionally, for each of these three types of signal systems, a caption transmission device that combines an SDI signal and ANC data has been prepared. However, the scale of the device increases and the cost is high, and each input signal is processed independently. Therefore, when switching programs, there has been a problem that character information from different signal systems is input, format conversion is performed, and character display is performed in real time when switching is performed.
JP 2002-330409 A (Page 4, FIG. 1) ARIB STD-B36 Digital subtitle file exchange format for digital television broadcasting.

  For digital broadcasting, three types of input signals with different input conditions are handled, and for each of the three types of subtitle input signals, subtitle transmission devices that combine SDI signals and ANC data are provided. However, the system scale is large and the cost is high. There were problems such as lack of real-time performance.

The present invention has been made to solve the above-described problem, and provides a caption transmission system and a caption superimposing method capable of transmitting captions capable of supporting real-time switching of three types of caption input signals by reducing the scale of the apparatus. There is.

In order to achieve the above object, a digital broadcast subtitle transmission system according to the present invention is a digital broadcast subtitle transmission system that transmits subtitle information superimposed on a digital broadcast SDI signal. Control means for outputting a control signal for selecting subtitle data of the subtitle information to be generated, analog subtitle data of analog teletext broadcasted by NAB formulated offline, and VANC area of HD and SD SDI signals formulated by ARIB Subtitle data transmitting means for outputting HD format subtitle data and SD format subtitle data described as an exchange subtitle signal, the analog subtitle data superimposed on an analog video signal or SD-SDI signal, A separated SDI signal with no caption data superimposed on the input signal, and the analog caption data; SDI / caption data separation means for separating, converting and outputting the VBI superimposed signal of D format subtitle data and SD format subtitle data, and the separated SDI signal from one external input to the other input SDI signal is input, a switch that receives the control signal and selects and outputs one of the input SDI signals as a superposition SDI signal, the control signal, and the superposition SDI signal, When the exchange character signal and the VBI superimposition signal are input and the HD or SD format subtitle data is described and superimposed as a VANC subtitle signal in the VANC area of the input superposition SDI signal, the VANC Separately output a separated SDI signal with no caption signal superimposed thereon and a VANC caption signal, and receive from each of the input caption signals In accordance with the designation of the control signal, analog subtitle data and HD and SD format subtitle data are selected, and the selected subtitle data is selected from the analog subtitle data in the VANC area of the separated SDI signal and each of the HD and SD format subtitle data. Digital subtitle transmitting means for generating and transmitting a transmission SDI signal arranged and superimposed at a predetermined description position.

The subtitle superposition method of the digital broadcast subtitle transmission system of the present invention comprises a selection control means, subtitle data transmission means, signal separation means, a switch, and digital subtitle transmission means, and converts the digital broadcast SDI signal into a digital broadcast SDI signal. In the subtitle superimposing method of the digital broadcast subtitle transmission system for superimposing and transmitting subtitle information, the selection control means outputs control information for outputting an input destination of an SDI signal and a control signal for selecting the superimposed subtitle information. The subtitle data transmission means that outputs to the data transmission means, the switch, and the digital subtitle transmission means and receives the control information includes the analog subtitle data of the analog character broadcast of NAB formulation produced offline and the HD of ARIB formulation , HD format subtitle data described in VANC area of SD SDI signal and SD format subtitle data are exchanged The separation means outputs an analog video signal or an SD-SDI signal with the analog caption data superimposed thereon, and the input signal is a separated SDI signal with no caption data superimposed thereon; The switch to which the control information is input is separated into the VBI superimposed signal of analog caption data, HD format caption data, and SD format caption data, and is output. SDI signal from an external subsystem is input to the input, and the control signal is received, one of the input SDI signals is selected as an SDI signal for superimposition and output to the digital subtitle sending means, The digital subtitle sending means to which a control signal is inputted receives the superposition SDI signal, the exchange character signal, and the VBI superposition signal. When the HD or SD format subtitle data is described and superimposed as a VANC subtitle signal in the VANC area of the input superposition SDI signal, the separated SDI signal in which the previous VANC character signal is not superimposed and the VANC character signal And outputs analog subtitle data and HD and SD format subtitle data from the input subtitle signals according to the designation of the control signal, and the selected subtitle data is selected from the subtitle data. Generates and sends out a transmission SDI signal that is arranged and superimposed at predetermined description positions of analog subtitle data in the VANC area of the signal and HD and SD format subtitle data.
It is characterized by that.

  According to the present invention, it is possible to provide a subtitle transmission system and a subtitle superimposition method capable of transmitting subtitles that can correspond to real-time switching of three types of subtitle input signals by reducing the apparatus scale.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a functional configuration of a digital broadcast subtitle transmission system according to Embodiment 1 of the present invention.
Hereinafter, the configuration and operation outline of the digital broadcast subtitle transmission system will be described with reference to FIG.

  In FIG. 1, the digital broadcast subtitle transmission system 7 includes a digital subtitle transmission device 1, a subtitle transmission unit 2, an SDI / subtitle separation unit 3, a control input unit 4, and a switcher unit 5. The digital broadcast subtitle transmission system 5 is connected to a subsystem 6 that outputs a digital broadcast signal.

  The digital subtitle transmission apparatus 1 is connected to a plurality of subsystems 6 via a switcher unit 5 and a subtitle transmission unit 2, an SDI / subtitle separation unit 3 that output subtitle signals, respectively. Then, the subtitle signal from any of the above three devices is selectively input by the switching control signal input from the control input unit 4, and the SDI (Serial Digital Interface) signal of the video signal input through the switcher unit is It generates and outputs a signal in which three types of ANC (Ancillary: auxiliary data) subtitle signals, which will be described later, are arranged and superimposed.

  The SDI / caption separation unit 3 is a video signal obtained by superimposing an analog subtitle signal (data) VBI subtitle signal on an analog video signal such as an NTSC signal, or a video obtained by converting an analog video signal into a digital SD-SDI signal. A digital video signal in which the VBI caption signal is superimposed on the signal is input.

  Then, the SD or HD SDI signal and the caption signal are separated and output from the SDI conversion output unit 32 and the analog caption extraction unit 31, respectively. Even if an analog video signal is input to the digital broadcast subtitle transmission system, it is converted to a digital SDI signal by the SDI / SDI conversion output section 32 of the SDI / subtitle separation section 3 and input to the digital subtitle output apparatus 1 via the switcher section 5. Therefore, the video information and the caption signal can be digitally superimposed. The digital subtitle output apparatus 1 selects a subtitle signal from a plurality of subtitle signal transmission sources, and the selected character information includes a subtitle signal in which three types of subtitle data are arranged and an SDI signal in which video information is superimposed. Can be output to.

  The control input unit 4 includes a console panel 41 including button switches and a display, an APC (automatic program transmission control device) 42, and a caption operation panel 43 for inputting caption information. The APC 42 selects the SDI signal from the subsystem 6 input to the switcher unit 5 or the SDI / caption separation unit 3 to the switcher unit 5 and outputs a switching control signal to be output to the digital caption transmission device 1. A switching control signal for selecting a caption signal from any one of the caption transmission unit 2 to the switcher unit 5 is output to the digital caption transmission device 1.

  The digital subtitle transmission apparatus 1 receives subtitle signals from the following three signal sources.

  An exchange subtitle signal is input from the subtitle sending unit 2 which is the first signal source. This exchange subtitle signal is character data to be telecasted, and is NAB-developed analog character broadcast subtitle data (hereinafter referred to as analog subtitle data) and ARIB-developed digital data, that is, HD- The three names generically are HD format caption data described in the VANC area of the SDI signal and SD format caption data described in the VANC area of the SD-SDI signal. Various subtitle control signals are input to the subtitle sending unit 2 from the console panel 41, the APC 42, the subtitle operation panel 43, etc. of the control input unit 4 through a LAN, an internal bus, or a control line, and edited. A caption signal is output to the digital caption transmission device 1.

  Second, a VBI superimposed caption signal is input from the SDI / caption separator 3. The SDI / caption separation unit 3 receives the NTSC analog signal or the VBI (Vertical Blanking Interval) caption signal (analog caption data) superimposed on the SD-SDI signal. Since this analog subtitle data conforms to the standard for NAB formulation, the VBI subtitle signal is described in the HD format subtitle data described in the VANC area of the HD-SDI signal of the ARIB standard and the VANC area of the SD-SDI signal. The format can be converted to SD format subtitle data.

  Therefore, the analog subtitle extraction unit 31 of the SDI / subtitle separation unit 3 includes three types of subtitle data of HD format subtitle data, SD format subtitle data, and analog subtitle data (hereinafter referred to as VBI superimposed subtitle signal). This is converted into a caption signal and output to the digital caption transmission device 1.

  Third, the VANC subtitle signal superimposed on the HD-SDI or SDI signal is input from the subsystem 6 via the switcher unit 5. The subtitle signal input from the subsystem 6 is subtitle data described by auxiliary data superimposed on the VANC (Vertical Ancillary) area of the SDI signal. The SDI signal on which the VANC subtitle signal is superimposed is output from the broadcasting station subsystem 6 such as a VTR to the switcher unit 5 and is selected by the switcher unit 5 by the switching control signal from the control input unit 4. The signal is output to the digital caption sending device 1 with the VANC caption signal superimposed.

FIG. 2 is a block diagram illustrating a functional configuration of the digital subtitle transmission apparatus 1.
In FIG. 2, the digital subtitle transmission apparatus 1 includes a CPU 11, a memory 12, a frame separation unit 13, a subtitle signal processing unit 14, a frame configuration unit 15, and an output interface 16 that are connected via an internal bus or the like.

  The CPU 11 receives a switching control signal for selecting each caption signal from the APC 42 of the control input unit 4 via the internal bus. The CPU 11 reads out a predetermined processing program from the memory 12 and activates it, or reads out the reference data, and selects the subtitle signal input from the subtitle transmission unit 2, the SDI / subtitle separation unit 3, and the switcher unit 5. Control is also performed such that the selected subtitle signal is converted into ANC data arranged in a predetermined format and superimposed on the SDI signal.

  The frame separation unit 13 separates the HD or SD SDI signal input from the switcher unit 5 into a VANC caption signal and an SDI signal (video information), and sends the VANC caption signal to the caption signal processing unit 14 as an SDI signal. Is output to the frame configuration unit 15. When the SDI signal input to the frame separation unit 13 is output from the SDI / subtitle separation unit 3 and input via the switcher unit 5, the SDI signal includes video information on which no caption is superimposed. It is only a signal.

  The subtitle signal processing unit 14 inputs the exchange subtitle signal from the subtitle transmission unit 2, the VBI subtitle signal from the SDI / subtitle separation unit 3, and the VANC subtitle signal from the frame separation unit 13 to the buffers 141 to 143. Then, the subtitle data is buffered, subtitle data of a required buffered signal is output to the frame configuration unit 15 in accordance with the switching signal from the CPU 11, and the buffered data that is not instructed to be output is discarded.

  The frame configuration unit 15 controls the CPU 11, that is, superimposes the caption data from the signal source designated by the APC 42 on the SDI signal and outputs it to the output interface 16.

  The output interface 16 outputs a video signal in which the SDI signal and the ANC data are superimposed on another subsystem.

3, 4, and 5 show the data format of the caption signal from the subsystem 6 via the caption transmission unit 2, the SDI / caption separation unit 3, and the switcher unit 5, which are input to the digital caption transmission device 1, respectively. An example of
Hereinafter, processing of caption signals in the digital caption transmission device 1 will be described with reference to FIGS.

  FIG. 3 shows a data format of a caption signal (packet) output from the caption transmission unit 2, and FIGS. 3 (a) to 3 (c) are cases where only one caption data is output, HD-format subtitle data of the HD-SDI signal, SD-format subtitle data of the SD-SDI signal, and analog subtitle data.

  Each caption data has, for example, a data frame structure conforming to the standard (the structure and operation of digital data transmitted in the ARIB STD-B37 auxiliary data packet format). Here, the caption field ID and character according to the present invention are used. Only two configurations of the data word DW are described.

  That is, the caption signal ID of each caption data includes, for example, “1” for HD format caption data, “2” for SD format caption data, and “3” for analog caption data. Identification information indicating which subtitle data is set is set and output from the subtitle transmission unit 2. Each character data word also describes, for example, data displayed on the screen in the format of each caption data in accordance with the standard.

  FIG. 3D shows a data format of exchange subtitles when simulcast is a typical example and the subtitle signal output from the subtitle transmission unit 2 outputs three types of subtitle signals in the same packet. In FIG. 3D, HD format subtitle data c1, SD format subtitle data c2, and analog subtitle data c3 are sequentially output from the top, and the subtitle field ID of each subtitle data and the contents of the character data word are shown in FIG. ) To (c). Accordingly, the digital subtitle transmitting apparatus 1 to which this packet is input can specify each subtitle data from the subtitle field ID.

  FIG. 4 shows the VBI superimposed caption signal output from the SDI / caption separation unit 3, and since the three caption data are output as described above, the data format is the same as in FIG.

  FIG. 5 shows a data format of the VANC caption signal input from the subsystem 6. FIG. 5A shows a data format when the subsystem 6 outputs an HD or SD SDI signal and a signal in which a corresponding caption signal (caption data) is superimposed, and FIG. When the sub-system 6 outputs a video signal in the same format as a video signal in which three types of subtitle signals are superimposed and superimposed on an HD or SD SDI signal similar to the output of the digital subtitle transmitting apparatus 1 of the present invention. Data format. The VANC caption signal is set in the caption area of the VANC area of the ANC area in accordance with the data frame format of the digital broadcast signal defined by the standard. The configuration and contents of the three types of arranged subtitle data are the same as (a) to (d) of FIG.

FIG. 6 is a diagram for explaining the concept of the buffer areas of the buffers 141 to 143 of the digital subtitle transmitting apparatus 1.
Each of the buffers 141 to 143 includes three areas of an HD format subtitle area hr for buffering HD format subtitle data, a similar SD format subtitle area sr, and an analog subtitle area ar. Each subtitle data input for each signal is buffered.

  Next, a process of switching and outputting a caption signal in accordance with switching of a broadcast program by the digital broadcast caption transmission system 7 according to the embodiment of the present invention will be described with reference to FIGS. In FIG. 1, it is assumed that broadcasting is rebroadcasting a past news recording program. In this case, the broadcast signal is output from the VTR of the NTSC signal output, and the SDI signal (here, SD-SDI signal) from the SDI / caption separation unit 3 is sent to the digital caption transmission device 1 via the switcher unit 5. The signal is input to the SDI signal input terminal.

  On the other hand, the VBI subtitle signal superimposed on the NTSC signal has “Japanese future ...” set in the analog subtitle format in the character data word DW of the analog subtitle data. As shown in FIG. 4, the caption extraction unit 31 sets “future of Japan ...” in the respective formats in the character data word DW of the HD format, the SD format, and the analog caption data, and the digital caption transmission device 1 Is output. In the digital subtitle transmitting apparatus 1, the respective subtitle data is buffered in each area of the buffer 142. In addition, the digital subtitle transmission apparatus 1 selects the VBI superimposed signal from the SDI / subtitle separation unit 3 based on the switching control signal from the APC 42, so that “the future of Japan ...” buffered in the buffer 142. The SDI signal set as the character data word DW of the three types of caption data and superimposed as a new VANC caption signal in the format shown in FIG. 5B is output to the external subsystem.

  During this broadcast, an emergency special news program will be broadcast, and for example, “Today, OO Prime Minister ...” will be displayed in subtitles. The caption sending unit 2 outputs the three exchanged caption data of “Today, OO Prime Minister is ...” input from the operator to the digital caption sending device 1 in the format of FIG. . Each exchange subtitle data is buffered in the buffer 141.

  Thereafter, when a switching control signal from the APC 42 is input to the digital caption sending device 1, the CPU 11 switches the caption data output from the buffer to the caption data buffered in the buffer 141 from the buffer 142. Then, on the SDI signal output from the digital subtitle transmission apparatus 1, three types of subtitle data “Today, OO Prime Minister is ...” are superimposed as a VANC subtitle signal in the format shown in FIG.

  Next, caption data processing for HD broadcasting (signal superimposed on the HD-SDI signal) will be described. Here, it is assumed that a program signal recorded for HD broadcasting is output in a format shown in FIG. 5A with only HD format caption data superimposed from the HD recording VTR. Such a program is prepared when analog broadcasting is not taken into consideration and it is produced for the purpose of broadcasting high-definition images such as art programs. In this case, a switching control signal is output from the APC 42 to the switcher 5 and the digital subtitle transmission apparatus 1 so that the HD VTR is the connected subsystem 6.

  In this case, the subtitle signal input from the HD VTR is only the HD format subtitle data of FIG. 5A, and the CPU 11 reads the subtitle field ID “1” and the HD subtitle of the buffer 143 of FIG. For example, subtitle data of “Western art” is buffered only in the area hr, but subtitle data to be put in another buffer area is not input.

  In order to arrange the caption data in the buffer 143, the CPU 11 sets “1” in the caption identification field of the HD format caption data, and buffers the caption data in which the character data of “Western art” is set in the character data word. . On the other hand, for example, “0” indicating invalidity is set in the subtitle identification field of SD format subtitle data and analog subtitle data with no data, and empty or dummy data is set in the character data word. That is, in the SDI signal output from the digital subtitle transmitting apparatus 1, a subtitle signal having three types of subtitle data areas is output to an external subsystem as in other cases, but effective subtitle data Is only in HD format, and subtitle data for SD digital and analog broadcasts that are not broadcast targets are set invalid.

  If the VANC subtitle signal includes three types of subtitle data as shown in FIG. 5B, the corresponding subtitle data is of course set in the three areas of the buffer 143, respectively. .

  The external subsystem to which the SDI signal output from the digital caption transmission device 1 is input is either HD, SD, or analog equipment, but the caption identification field IDs “1” to “3” ”And any subtitle data corresponding to the device itself may be acquired. Therefore, it is not necessary to prepare a caption transmission device for each caption format (broadcast format) as in the prior art.

  In the digital subtitle transmitting apparatus 1 of the first embodiment, when the input SDI signal includes only HD format subtitle data, SD subtitle data and analog subtitle data are not output. However, there are cases in which high-definition images are broadcast by analog broadcasting. In such a case, there is a disadvantage that the number of devices increases because a converter for converting HD format caption data to analog caption data must be further added between the digital caption transmission device 1 and the subsystem. Therefore, in the second embodiment, the digital subtitle transmission apparatus 1 includes a converter function that outputs three types of subtitle data from the VANC subtitle signal superimposed on the SDI signal.

FIG. 7 is a block diagram illustrating a functional configuration of the digital subtitle transmission apparatus 1 according to the second embodiment.
In FIG. 7, the digital subtitle transmission apparatus 1 is the same as that of the first embodiment except that a subtitle converter unit 1431 is inserted between the frame separation unit 13 and the buffer 143. The subtitle converter unit 1431 reads the VANC subtitle data of the input SDI signal. If the subtitle signal has only one subtitle data, it reads the identification field IDs “1” to “3”. Then, the subtitle data (here, HD subtitle data in which “1” is set) is converted into another format corresponding to the standard, and SD subtitle data and analog subtitle data are generated. By doing this, each subtitle data is set in the HD subtitle area hr, the SD subtitle area sr, and the analog subtitle area ar. If the VANC subtitle signal includes only SD subtitle data, HD subtitle data and analog subtitle data are generated.

  This subtitle converter unit 1431 is not an independent circuit. When the CPU 11 reads the signal output from the frame separation unit 13 to the internal bus and is only HD format subtitle data, the SD subtitle data (HD format) When only subtitle data is input, SD subtitle data) and analog subtitle data may be generated.

  As described above, in the digital broadcast subtitle transmission system according to the embodiment of the present invention, the SDI signal on which the three types of subtitle data input from the signal source of each subtitle data are superimposed is output from the digital subtitle transmission apparatus 1. . Then, the external subsystem to which the SDI signal is input reads the subtitle identification field “1” to “3” corresponding to each device, such as HD, SD, or analog, by itself. By acquiring the data, it is possible to eliminate the need for preparing a caption transmission device for each broadcast format as in the prior art.

  Therefore, the digital broadcast caption transmission system of the present invention requires less device configuration than the conventional system, and the caption data can be easily switched on the SDI signal transmission side, and the required caption data is automatically extracted from the common data packet on the reception side. Therefore, it is possible to provide a digital broadcast subtitle transmission system and a subtitle transmission device with excellent real-time performance.

1 is a block diagram showing a functional configuration of a digital broadcast subtitle transmission system according to Embodiment 1 of the present invention. The block diagram which shows the function structure of a digital caption transmission apparatus. The example of the data format of the input signal from the subtitle transmission part input into a digital subtitle transmission apparatus. The example of the data format of the input signal from the analog extraction part input into a digital subtitle transmission apparatus. An example of a data format of an input signal from a subsystem input to the digital subtitle transmission apparatus 1. The figure explaining the concept of the buffer area | region of the buffer of a digital subtitle transmission apparatus. The block diagram which shows the function structure of the digital subtitle transmission apparatus which concerns on Example 2 of this invention.

Explanation of symbols

1 Digital caption sending device 11 CPU
12 Memory 13 Frame Separation Unit 14 Subtitle Signal Processing Unit 15 Frame Configuration Unit 16 Output Interface Units 141 to 143 Buffer 1431 Subtitle Converter Unit 2 Subtitle Sending Unit 3 SDI / Subtitle Separation Unit 31 Analog Subtitle Extraction Unit 32 SDI Conversion Output Unit 4 Control Input Part 41 Desk panel 42 APC
43 Subtitle Operation Panel 5 Switcher 6 Subsystem 7 Digital Broadcast Subtitle Transmission System a1 ANC Data c1 HD Format Subtitle Signal c2 SD Format Subtitle Signal c3 Analog Subtitle Data ID Character Data Identification Field v1 VANC Data hr HD Format Subtitle Area sr SD Format Subtitle Area ar Analog (caption) area

Claims (4)

In a digital broadcast subtitle transmission system that superimposes subtitle information on an SDI signal of digital broadcast and transmits it,
Selection control means for outputting an input destination of the SDI signal and a control signal for selecting caption data of the superimposed caption information;
Outputs analog subtitle data of NAB-developed analog teletext broadcasted offline, HD format subtitle data described in the VANC area of HD and SD SDI signals, and SD subtitle data as exchange subtitle signals Subtitle data sending means to
The analog caption data is superimposed and input on an analog video signal or SD-SDI signal, and the input signal is separated SDI signal on which caption data is not superimposed, the analog caption data, HD format caption data, SD SDI / subtitle data separating means for separating, converting and outputting the VBI superimposed signal with the format subtitle data;
The separated SDI signal is input to one input, the other input is an SDI signal from an external subsystem, the control signal is received, and any one of the input SDI signals is used as a superposition SDI signal. A switch to select and output,
The control signal, the superposition SDI signal, the exchange character signal, and the VBI superposition signal are input,
When the HD or SD format subtitle data is described and superimposed as a VANC subtitle signal in the VANC region of the input superposition SDI signal, a separated SDI signal in which the VANC subtitle signal is not superimposed, a VANC subtitle signal, Output to
From the input subtitle signals, analog subtitle data and HD and SD format subtitle data are selected according to the specification of the input control signal, and the selected subtitle data is selected from the VANC area of the separated SDI signal. Digital subtitle transmission means for generating and transmitting a transmission SDI signal that is arranged and superimposed at predetermined description positions of the analog subtitle data and HD and SD format subtitle data
A subtitle transmission system for digital broadcasting, comprising: The digital subtitle sending means includes
A subtitle converter that converts the subtitle data of the separated VANC subtitle signal into subtitle data of the other format and analog subtitle data and outputs the subtitle data;
The sending SDI signal is:
2. The analog subtitle data specified by the control signal and HD and SD format subtitle data are superimposed from the exchange subtitle signal, the VBI superimposed subtitle signal, and the VANC subtitle signal. Digital broadcasting subtitle transmission system. A subtitle superimposing method for a digital broadcast subtitle transmitting system, comprising selection control means, subtitle data transmitting means, signal separating means, a switch, and digital subtitle transmitting means, wherein subtitle information is superimposed on a digital broadcast SDI signal and transmitted. In
The selection control means outputs control information for outputting an input destination of an SDI signal and a control signal for selecting the superimposed caption information to the caption data sending means, the switch, and the digital caption sending means,
The subtitle data sending means that has received the control information includes analog subtitle data for analog teletext broadcasted by NAB that is produced off-line, and HD-format subtitle data that is described in the VANC area of the HD and SD SDI signals of ARIB And SD format subtitle data as an exchange subtitle signal,
The separation means inputs the analog caption data superimposed on the analog video signal or SD-SDI signal, and separates the input signal from the separated SDI signal without caption data superimposed, the analog caption data, HD Format subtitle data, SD format subtitle data and VBI superimposed signal are separated, converted and output,
The switch to which the control information is input is
The separated SDI signal is input to one input, the other input is an SDI signal from an external subsystem, the control signal is received, and any one of the input SDI signals is used as a superposition SDI signal. Select and output to the digital subtitle sending means,
The digital subtitle sending means to which the control signal is input receives the superposition SDI signal, the exchange character signal, and the VBI superposition signal, and inputs the HD into the VANC area of the input superposition SDI signal. Alternatively, when the SD format caption data is described and superimposed as a VANC caption signal, it is separated and output into a separated SDI signal in which the VANC character signal is not superimposed and a VANC character signal, and each of the inputted caption signals is Among them, analog subtitle data and HD and SD format subtitle data are selected in accordance with the designation of the control signal, and the selected subtitle data is selected from the analog subtitle data and HD and SD format subtitle data in the VANC area of the separated SDI signal. A SDI signal for transmission that is arranged and superimposed at each predetermined description position is generated and transmitted.
A subtitle superimposing method for a digital broadcast subtitle transmission system . The digital subtitle sending means includes
The subtitle data of the separated VANC subtitle signal is converted into subtitle data of the other format and analog subtitle data and output,
The sending SDI signal is obtained by superimposing the analog caption data specified by the control signal and the HD and SD format caption data from the exchange caption signal, the VBI superimposed caption signal, and the VANC caption signal. 4. A caption superimposing method for a digital broadcast caption sending system according to claim 3.

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