JP4295963B2 - Analog teletext broadcasting / digital teletext conversion device and analog teletext / digital teletext conversion method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to a digital broadcast program transmission device for transmitting a program information signal of digital broadcast, and converts an analog teletext signal standardized by analog broadcast into a digital broadcast format to be multiplexed with the program information signal. The present invention relates to an analog character broadcast / digital character broadcast conversion device and an analog character broadcast / digital character broadcast conversion method.
[0002]
[Prior art]
In recent years, with the establishment of digital broadcasting technology, digital broadcasting has been started in satellite broadcasting systems using communication satellites and broadcasting satellites, and the transition to digital broadcasting is also planned in terrestrial broadcasting systems.
[0003]
In the broadcasting station of the above digital broadcasting, it is also proposed to perform the character multiplex broadcasting that multiplexes and transmits the character broadcasting data composed of characters and figures in the broadcasting signal, as already implemented in the analog broadcasting. Yes. In character multiplex broadcasting, various information programs are broadcasted, and some of them provide subtitle information relating to programs to be broadcast.
[0004]
By the way, in the future, coexistence with analog broadcasting is considered until the above-mentioned digital broadcasting becomes widespread. In this case, a transmission system for analog broadcasting and a transmission system for digital broadcasting are used together in one broadcasting station. Will be.
However, in the above broadcasting station, when teletext broadcasting is performed, it is necessary to prepare a teletext production device for analog broadcasting and a teletext production device for digital broadcasting separately, which increases the cost of the system. Will be invited.
[0005]
On the other hand, it is also possible to use an existing analog teletext production device used in analog broadcasting and generate a digital teletext signal from the analog teletext signal produced by this analog teletext production device. .
However, in digital broadcasting, the character multiplexing technology that has been implemented in analog broadcasting cannot be applied as it is.
[0006]
[Problems to be solved by the invention]
As described above, in digital broadcasting, analog broadcasting character multiplexing technology cannot be applied as it is, and an effective means has been desired.
SUMMARY OF THE INVENTION An object of the present invention is an analog character broadcast / digital character broadcast conversion apparatus and analog character broadcast / digital which can be implemented in a digital broadcast program transmission system and can realize a text multiplex broadcast service while suppressing cost increase as much as possible. It is to provide a teletext conversion method.
[0007]
[Means for Solving the Problems]
To achieve the above object, an analog teletext / digital teletext conversion apparatus according to the present invention is applied to a digital broadcast program transmission apparatus that transmits a digital broadcast program information signal based on a composition time, and at least program management information. An analog teletext signal standardized by analog broadcasting having an area and a content information area is converted into a digital teletext signal having at least a header area, a control information area, and a content information area to be multiplexed with the program information signal A teletext / digital teletext conversion device that captures and analyzes data in a program management information area from an input analog teletext signal, generates data in a header area, and matches the organization time of the program information signal To send / stop the digital teletext signal to be put in the control information area Header / control data generating means for generating necessary control data and content information area data from the input analog teletext signal is analyzed and analyzed for the receiver of the digital broadcast according to the signal format of the program information signal Display designation parameter data adding means for adding display designation parameter data necessary for controlling the character display range and character display coordinate conversion to the data in the content information area, and the header area and control generated by the header / control data generation means An output buffer for storing and outputting data of each information area and data of the content information area obtained by the display designation parameter data adding means is provided.
[0008]
According to this configuration, the input analog teletext signal is divided into program management information area data and content information area data, from among the program management information area data, the digital teletext signal header area data, And control data necessary for sending / stopping the digital teletext signal such as sending timing and erasing timing according to the organization time of the program information signal, and analyzing the data in the content information area, and analyzing the analyzed data In addition, character display range instruction information and character display coordinate conversion instruction information in accordance with the signal format of the program information signal are added to the output buffer. Thereafter, the header area data, the control information area data, and the content information area data are output buffers. The digital teletext signal is generated by storing it in the video and outputting it to the sending device. That is, it is possible to realize a function of converting an analog teletext signal produced by a known analog teletext production terminal into a digital broadcast format.
[0009]
For this reason, analog teletext production terminals are used to produce digital teletext signals in the format for digital broadcasting, so there is no need to prepare a dedicated digital teletext production terminal and digital teletext broadcast from scratch. Since there is no need to produce a signal, the economic burden can be reduced and the production time can be shortened. In addition, the production process of the digital teletext signal can be completed in a relatively short time because the header area and control information area generation process and the content information area generation process are performed in parallel. This is also very advantageous for processing that requires the following. Further, the content information area generation processing is only added to the character display range instruction information and the character display conversion instruction information in accordance with the signal format of the program information signal in the content information area of the known analog teletext signal. The calculation processing amount of the processor is reduced, and the digital teletext signal can be generated even with an inexpensive processor by reducing the burden.
[0010]
In the above configuration, the display designation parameter data adding means adds display instruction parameter data for displaying character information in accordance with the main screen portion of the program information signal to the data in the content information area. In this way, it is possible to prevent subtitle information from being displayed on the display screen from the main screen portion, or from being expanded and compressed in the vertical and horizontal directions, making it difficult to see the subtitle information. The viewer can view the caption information on an easy-to-view display screen.
[0011]
In the above configuration, when the program information signal is a signal of the 1125 line system, the display designation parameter data adding means adds the character display range instruction information and the character display corresponding to the 1125 line system to the data in the content information area. Coordinate instruction information is added. For example, in digital broadcasting, mixed broadcasting of 1125-line high-definition television signals and normal television signals of 525-line systems and broadcasting dedicated to 1125-line systems are considered, and characters corresponding to 1125-line system signals are considered. If display range instruction information and character display coordinate instruction information are added to data in the content information area, subtitle information can be reproduced and displayed flexibly corresponding to both types of television broadcasting in the receiver. .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a digital broadcast program transmission system when an embodiment of an analog character broadcast / digital character broadcast conversion apparatus of the present invention is applied.
[0013]
1 includes an encoder (ENC) 11, 12, a multiplexer (MUX) 13, an encoding multiplex control device (EMC) 14, an automatic program transmission control device (APC) 15, an in-station And a clock 16.
The encoder 11 compresses and encodes the video signal using the MPEG2 encoding method to generate a program information signal (bit stream), and outputs the program information signal to the multiplexer 13. The encoder 12 compresses and encodes the audio signal using the MPEG2 encoding method to generate a bit stream, and outputs the bit stream to the multiplexer 13. The multiplexer 13 multiplexes the outputs of the encoders 11 and 12 and data such as PMT (Program Map Table) and PAT (Program Association Table) output from the encoding and multiplexing control device 14, and transport stream (TS). Send out as The encoding multiplex control device 14 controls the encoders 11 and 12 and the multiplexer 13 based on the instruction information provided from the automatic program transmission control device 15, the broadcast schedule data, and the knitting time measured by the local clock 16.
[0014]
By the way, the digital broadcast program transmission system of this embodiment further includes an analog character broadcast production terminal device 17, a character broadcast conversion device 18, a character broadcast transmission device 19, and an encoder 20. The analog character broadcast production terminal device 17 produces an analog character broadcast signal such as subtitles and sends out the produced analog character broadcast signal based on the broadcast schedule data and the instruction information from the automatic program transmission control device 15. The analog teletext signal is converted into a digital broadcast format by the teletext converter 18 and then transmitted by the teletext transmitter 19 according to an instruction from the automatic program transmission controller 15. Then, after being compressed and encoded by the encoder 20 using the MPEG2 encoding method, it is multiplexed with another bit stream by the multiplexer 13.
[0015]
FIG. 2 is a block diagram showing the configuration of the teletext conversion device 18 according to an embodiment of the present invention.
In FIG. 2, an input control unit 182, a shared memory 183, a CPU 184, an output buffer 185, and an output control unit 186 are connected on the data bus 181. In addition, a display instruction parameter storage unit 187 is connected to the CPU 184.
[0016]
The input control unit 182 takes in the NAB format analog teletext signal including the program management information unit and the content information unit produced by the analog teletext production terminal device 17, transfers it to the appropriate area of the shared memory 183, and completes the transfer Later, the CPU 184 is notified of the presence area of the analog teletext signal on the shared memory 183.
[0017]
The CPU 184 includes a header / information data generation function and a display instruction parameter addition function. Based on the notification from the input control unit 182, the CPU 184 takes in the analog text broadcast signal from the shared memory 183 and converts the analog text broadcast signal into the analog text broadcast signal. On the other hand, processing by a header / information data generation function and a display instruction parameter addition function is performed. Of these, the header / information data generation function performs analysis processing of program management information in the analog teletext signal, calculates the contents of the PES header and TS header, and writes the contents of the PES header and TS header to the output buffer 185. Further, control data such as the transmission timing and erasure timing of subtitle information to be entered in the control information section is generated in accordance with the composition time of the program information signal based on the instruction information from the automatic program transmission control device 15, and the control data is stored in the output buffer 185 Write.
[0018]
The display instruction parameter addition function analyzes the content information in the analog teletext signal, and displays text on the digital broadcast receiver according to the signal format of the program information signal according to the instruction information from the automatic program transmission control device 15. Display instruction parameter data for controlling the range and character display coordinate conversion is read from the display instruction parameter storage unit 187, and the display instruction parameter data is written in the content information existence area on the shared memory 183. Further, the transfer control unit 186 designates the transfer start address and the number of transfer bytes of the shared memory 183.
[0019]
The output control unit 186 transfers data in the shared memory 183 to the output buffer 185 as data in the content information unit by the number of bytes specified from the address specified by the CPU 184.
The output buffer 185 stores the PES header from the CPU 184, the TS header, the control data of the control information section, and the data of the content information section transferred from the shared memory 183 through the output control section 186, thereby enabling the digital broadcast format (TS packet). Format) digital teletext signal is generated and output as appropriate.
[0020]
The processing operation of the above configuration will be described below. FIG. 3 is a flowchart showing a control procedure and control contents by the CPU 184 when executing the processing operation.
That is, the analog teletext signal produced by the analog teletext production terminal device 17 is transferred to an appropriate area of the shared memory 183 by the input control unit 182. When the transfer of the analog teletext signal is completed, the input control unit 182 notifies the CPU 184 of the presence area of the analog teletext signal.
[0021]
On the other hand, the CPU 184 reads the analog teletext signal from the shared memory 183 and executes an analysis process (step ST1), and discriminates the data of the program management information section and the content information section in the analog teletext signal. (Step ST2). Here, when it is determined that the data is in the program management information section, the contents of the PES header and TS header are calculated from the contents of the program management information section, and the transmission timing and erasure are matched with the program information signal by the instruction information from the APC 15. Data contents of the control information section such as timing and caption information are calculated (step ST3), and the contents are written in the output buffer 185 (step ST4).
[0022]
For the data in the content information section that follows, the CPU 184 determines the signal format of the program information signal from the instruction information from the APC 15, and reads out the corresponding display instruction parameter data from the display instruction parameter storage section 187 based on the determination result. Writing into the content information area of the shared memory 183 (step ST5). Thereafter, the CPU 184 specifies the transfer start address and the number of transfer bytes in which the data of the content information portion of the shared memory 183 is stored for the output control unit 186. Then, the output control unit 186 transfers the data in the shared memory 183 from the designated address of the CPU 184 by the designated number of bytes to the output buffer 185 as the content information unit data. This generates a digital teletext signal.
[0023]
Next, the state of reproduction display of the receiver by adding the display instruction parameter data will be described with reference to FIGS.
Here, in the analog broadcasting that has been conventionally performed, the broadcast station side multiplexes and transmits the caption information in the broadcast signal, so that the caption information is reproduced together with the video on the receiver side as shown in FIG. Is displayed. By the way, when digital broadcasting is implemented, when an SDTV (Standard Definition TV) signal having an aspect ratio of 4: 3 shown in FIG. 5A is displayed on a screen having an aspect ratio of 16: 9, the display shown in FIG. As shown in FIG. 6, a non-image portion is provided on the left and right ends for display, or as shown in FIG. 6A, image compression processing is performed on the broadcast station side, and reception is performed as shown in FIG. 6B. It is also possible to display the image after it has been decompressed on the machine side. Further, as shown in FIG. 7A, a signal with an aspect ratio of 16: 9 can be transmitted on the broadcasting station side, and can be reproduced and displayed as it is on the receiver side as shown in FIG. 7B.
[0024]
However, in the NAB format standardized by analog teletext, the display format of subtitle information is determined in advance with an aspect ratio of 4: 3. Therefore, as shown in FIGS. Subtitle information cannot be displayed at the same time. Therefore, in the embodiment of the present invention, by inserting display instruction parameter data for designating the character display range and character display coordinate conversion to the receiver in the content information portion in the analog teletext signal, the program information signal Subtitle information can be displayed in accordance with various formats.
[0025]
For example, in the display format as shown in FIG. 5, if the character display range is designated in accordance with the main screen portion, the caption information can be clearly displayed on the main screen portion. Further, in the display format as shown in FIG. 6, if character display coordinate conversion is specified so that the roundness rate becomes 1 on the receiver side, it can be displayed on the screen without a sense of incongruity.
[0026]
Further, in digital broadcasting, mixed broadcasting of HDTV (High Definition TV) signal of 1125 line system and SDTV signal is considered. In this case, if the character display range instruction information and the character display coordinate instruction information corresponding to the HDTV signal are added to the data of the content information section, the subtitle information flexibly supports both types of television broadcasting in the receiver. Can be reproduced and displayed.
[0027]
As described above, in the above-described embodiment, in the teletext conversion device 18, the analog teletext signal produced by the analog teletext production terminal device 17 is transferred to the shared memory 183 by the input control unit 182 and the shared memory 183 is also used. The CPU 184 is notified of the analog teletext signal existing area. Upon receiving this notification, the CPU 184 takes in and analyzes the analog teletext signal from the shared memory 183, generates a PES header and a TS header from the data of the program management information section of the analog teletext signal, and organizes the program information signal. A header / control data generation processing procedure for generating control data necessary for sending / stopping the digital teletext signal to be put in the control information section in accordance with the program information signal in the content information existing area in the shared memory 183 In accordance with the signal format, the display instruction parameter addition processing procedure for writing the character display range instruction information and the character display coordinate conversion instruction information read from the display instruction parameter storage unit 187 is executed. Thereafter, the CPU 184 stores the data of the PES header, the TS header, and the control information part in the output buffer 185, and designates the transfer start address and the number of transfer bytes of the content information existing area on the shared memory 183 to the output control part 186. The digital teletext signal is generated by storing the data in the content information section in the output buffer 185. That is, it is possible to realize a function of converting an analog teletext signal produced by a known analog teletext production terminal device 17 into a digital broadcast format, and the producer produces a teletext signal for analog broadcast. Just get better.
[0028]
For this reason, since the digital teletext signal in the format for digital broadcasting is produced using the known analog teletext production terminal device 17, a separate digital teletext production terminal is not required. Therefore, since it is no longer necessary to produce a digital teletext signal, the economic burden can be reduced and the production time can be shortened. Also, with regard to the production processing of the digital teletext signal, the CPU 184 completes the processing in a relatively short time because the generation processing of the PES header, TS header and control information portion and the generation processing of the content information portion are performed in parallel. In particular, it is very advantageous for processing that requires real-time properties such as caption information. Further, since the content information part generation processing only adds character display range instruction information and character display conversion instruction information in accordance with the signal format of the program information signal in the content information part of the analog teletext signal, the CPU 184 The calculation processing amount is reduced, and by reducing the burden, a digital teletext signal can be generated even with an inexpensive processor.
[0029]
In the above embodiment, in the content information section generation processing procedure, the CPU 184 displays display instruction parameter data for displaying character information in accordance with the main screen portion of the program information signal to be broadcast. The data is read from 187 and added to the data in the content information section in the shared memory 183. For this reason, it is possible to prevent subtitle information from being displayed on the display screen by protruding from the main screen portion on the display side, or from expanding and compressing the main screen portion in the vertical and horizontal directions. Thus, the viewer can view the caption information on an easy-to-view display screen.
[0030]
Furthermore, in the above embodiment, when the program information signal is an HDTV signal of the 1125 line system in the content information section generation processing procedure, the character display range instruction information corresponding to the 1125 line system is included in the data in the content information area. If the character display coordinate instruction information is added, the receiver can reproduce and display a character broadcast signal such as subtitle information in a flexible manner corresponding to television broadcasting of various signal systems.
In addition, the configuration of the teletext conversion device, the processing procedure by the CPU, the type of data in the control information section, the type of display designation parameter data, and the like can be variously modified without departing from the scope of the present invention.
[0031]
【The invention's effect】
As described above in detail, according to the present invention, an analog character broadcast / digital character broadcast conversion device and an analog in a digital broadcast program transmission system capable of realizing a text multiplex broadcast service while suppressing cost increase as much as possible. A teletext / digital teletext conversion method can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a digital broadcast program transmission system to which the present invention is applied.
FIG. 2 is a block diagram showing a configuration of a teletext conversion device according to an embodiment of the present invention.
FIG. 3 is a flowchart shown for explaining the processing operation of the CPU shown in FIG. 2;
FIG. 4 is a diagram showing an example of caption information display implemented in analog broadcasting.
FIG. 5 is a diagram showing an example of caption information display implemented in digital broadcasting.
FIG. 6 is a diagram showing another example of subtitle information display performed in digital broadcasting.
FIG. 7 is a diagram showing another example of subtitle information display that is also implemented in digital broadcasting.
[Explanation of symbols]
11, 12, 20 ... encoder (ENC),
13: Multiplexer (MUX),
14: Encoding multiplex control device (EMC),
15 ... Automatic program transmission control device (APC),
16 ... Internal clock,
17 ... Analog teletext production terminal device,
18 ... teletext conversion device,
19 ... a teletext broadcasting device,
181 ... Data bus,
182 ... Input control unit,
183 ... shared memory,
184 ... CPU,
185 ... output buffer,
186: Output control unit,
187: Display instruction parameter storage unit.

Claims (8)

An analog teletext signal that is applied to a digital broadcast program transmission device that transmits a digital broadcast program information signal based on a composition time, and includes at least a program management information area and a content information area, and is standardized by analog broadcast. An analog character broadcast / digital character broadcast conversion device for converting into a digital character broadcast signal comprising at least a header region, a control information region, and a content information region to be multiplexed with an information signal,
The program management information area data is captured from the input analog teletext signal and analyzed to generate data for the header area, and the digital information to be placed in the control information area in accordance with the organization time of the program information signal Header / control data generating means for generating control data necessary for sending / stopping the teletext signal;
In parallel with the processing of the header / control data generating means, the data in the content information area is captured and analyzed from the input analog teletext signal, and the digital broadcast receiver is adapted to the signal format of the program information signal. character display range indication information necessary to control the display range, and the character Lud over data added be added to the data of the display the character display coordinate conversion instruction information necessary for controlling the coordinate transformation the content information area against Means,
By comprising an output buffer for outputting stores data of the obtained content information area by the header header area generated by the control data generating means and the control information area each data before Kide over data adding means An analog teletext / digital teletext converter.   The multiplexed signal of the program information signal and the digital teletext signal is a TS (Transport Stream) generated in a format defined by MPEG2 (Moving Picture Experts Group 2) encoding method, and the header / control data generation The means according to claim 1, wherein the means receives and analyzes the data of the program management information area from the input analog teletext signal, and generates data of a PES (Packetized Elementary Stream) header part and a TS header part. Analog teletext / digital teletext converter. Before Kide over data adding means, adding the program information signal character display range indication information and character display coordinate conversion instruction information Ru to display character information in accordance with the main screen portion in the data of the content information area The analog character broadcast / digital character broadcast conversion device according to claim 1. Before Kide over data adding means, wherein, when the program information signal is a signal of 1125 line system, the data in the content information area, a character display range indication information and character display coordinate instruction information corresponding to the 1125 line system The analog character broadcast / digital character broadcast conversion device according to claim 1, further comprising: An analog teletext signal that is applied to a digital broadcast program transmission device that transmits a digital broadcast program information signal based on a composition time, and includes at least a program management information area and a content information area, and is standardized by analog broadcast. An analog teletext / digital teletext conversion method for converting to a digital teletext signal comprising at least a header region, a control information region, and a content information region to be multiplexed with an information signal,
The program management information area data is captured from the input analog teletext signal and analyzed to generate data for the header area, and the digital information to be placed in the control information area in accordance with the organization time of the program information signal Generate the control data necessary to send / stop the teletext signal,
In parallel with the generation processing of the header area data and the control data to be entered in the control information area, the content information area data is captured and analyzed from the input analog teletext signal, and the signal format of the program information signal is obtained. In addition, character display range instruction information necessary for controlling the character display range for the digital broadcast receiver and character display coordinate conversion instruction information necessary for controlling character display coordinate conversion are stored in the content information area. Append to the data,
An analog character broadcast / digital character, wherein the digital character broadcast signal is generated by storing and outputting the generated data of the header area and the control information area and the data of the content information area in an output buffer. Broadcast conversion method.   Analog input when the multiplexed signal of the program information signal and the digital teletext signal is a TS (Transport Stream) generated in a format defined by MPEG2 (Moving Picture Experts Group 2) encoding method 6. The analog character broadcast / digital character broadcast according to claim 5, wherein the data of the program management information area is taken in from a character broadcast signal and analyzed to generate data of a PES (Packetized Elementary Stream) header part and a TS header part. Conversion method. According to claim 5, wherein adding the program information main screen character display range indication information and character display coordinate conversion instruction information Ru to display character information in accordance with the portion of the signal in the data of the content information area Analog teletext / digital teletext conversion method.   The character display range instruction information and character display coordinate instruction information corresponding to the 1125 line system are added to the data in the content information area when the program information signal is a signal of the 1125 line system. Item 6. The analog character broadcast / digital character broadcast conversion method according to item 5.

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