JP4504759B2 - Content service transmitter and receiver - Google Patents

Description

The present invention relates to transmit and the receiver of the content services, in particular while maintaining viewing type of basic content in service for distributing content, content service that provides content viewing embodiments in which value-added on the transmit and receiving devices.

  As a method for distributing the content of the additional service to the content of the basic service, for example, there is a subtitle / character super encoding method described in Non-Patent Document 1. In this method, video without superimposition is used as a basic service, video with superimposition is used as an additional service, and the basic service can be obtained by a decoder with a simple configuration. In this configuration, an image can be obtained.

  Similarly to Non-Patent Document 1, Patent Document 1 transmits a video signal and a character code, and the receiving device adds the video signal and a character pattern generated from the character code to superimpose subtitles. It is described that an imposed video and a video without subtitles can be selected on the receiving device side.

Further, Patent Document 2 describes a video tape recorder that detects a breaking news sound that has entered during the recording of a television program and erases the breaking news sound by recording an inverted signal of the breaking news sound.
ARIB STD-B24 “Data Broadcast Coding and Transmission Methods for Digital Broadcasting” Volume 1 Part 3 “Subtitle / Text Super Coding” JP-A-6-54273 Utility Model Registration No. 3095205

  As described in Non-Patent Document 1, in digital broadcasting, there is a standard for superimposing captions with a receiving device. If this is used, superimposition of hourly reports and breaking news will be performed in real-time viewing situations, and unnecessary superimpositions of unnecessary time reports and breaking news will be deleted in non-real-time viewing situations such as recording and playback. And superimposing can be performed selectively.

  FIG. 4 is a block diagram showing an example of a conventional digital broadcasting system that performs superimposition. In the figure, in the transmission apparatus 110, an encoding unit 113 encodes input video / audio by an encoding method such as MPEG-2 and supplies the encoded video / audio to the multiplexing unit 115. Further, the PMT generation unit 114 generates a PMT (Program Map Table) that specifies the packet ID of the TS packet that transmits the video / audio encoded signal, and supplies the PMT (Program Map Table) to the multiplexing unit 115.

  On the other hand, the encoding unit 111 is supplied with a subtitle pattern of time and breaking news, for example, encodes using the subtitle / character super encoding method described in Non-Patent Document 1, and supplies it to the multiplexing unit 115. In addition, the PMT generation unit 112 generates a PMT that specifies the packet ID of the TS packet that transmits the encoded signal for subtitles, and supplies the PMT to the multiplexing unit 115.

  The PAT generation unit 116 generates a PAT (Program Association Table) that specifies the packet ID of the TS packet that transmits the PMT, and supplies the PAT (Program Association Table) to the multiplexing unit 115. The multiplexing unit 115 generates a multiplexed signal for video / audio, generates a multiplexed signal for subtitles, multiplexes these multiplexed signals, and transmits them. The main service content is composed of output signals from the encoding unit 113 and the PMT generation unit 114, and the optional content is composed of output signals from the encoding units 111 and 113 and the PMT generation unit 112.

  In the receiving device 20, the demultiplexing unit 121 demultiplexes the video / audio multiplexed signal and the caption multiplexed signal from the received multiplexed signal. In accordance with an instruction from the PAT / PMT interpretation and service control unit 122, the demultiplexing unit 121 supplies an encoded signal for video / audio to the decoding unit 123 and a recording / reproducing device (not shown), and decodes the encoded signal for subtitles. The video / audio and subtitle PMTs are supplied to the PAT / PMT interpretation and service control unit 122.

  The decoding unit 123 decodes the video / audio from the video / audio encoded signal and supplies the decoded video / audio to the superimposing unit 125, and the decoding unit 124 decodes the subtitle pattern from the subtitle encoded signal to superimpose 125. The superimposing unit 125 adds the subtitle pattern to the video / audio for video / audio, and the video / audio that has been superimposed is presented by the presentation unit 126.

  Also, the video / audio encoded signal reproduced from the recording / reproducing device is decoded into video / audio by the decoding unit 123, and is presented by the presentation unit 126 through the superimpose unit 125.

  In this way, the function of superimposing captions in the receiving device is an option, and the receiving device having this optional function includes a decoding unit 124 that decodes captions in addition to the decoding unit 123 that decodes video, A superimposing unit 125 is required.

  However, since there is no guarantee that a general receiving apparatus includes the decoding unit 124 and the superimposing unit 125, selective superimposing cannot be actually used, and broadcasting is performed in the same manner as in the analog era. The station must superimpose subtitles on the video and broadcast the video with subtitles.

  For this reason, when recording / playback, superimposition of hourly or breaking news is to be removed, that is, the basic service is a video with superimpose and the additional service is a clean video without superimposition. In such a case, there is a problem that the techniques of Non-Patent Document 1 and Patent Document 1 cannot be used.

The present invention has been made in view of the above, to provide a transmit device and a receiving device of the content services that can be added to change the presence or absence of superimposed basic services and supplementary services services With the goal.

The invention according to claim 1 is a content service receiving apparatus that provides a viewing mode with added value while maintaining a basic content viewing mode,
Means for receiving signals constituting the basic service content and the additional service content transmitted from the transmission device;
Means for outputting the content of the received basic service when the content usage condition set in the own apparatus is a basic service, and outputting the content of the received additional service when the content usage condition set in the own apparatus is an additional service I have a,
The content of the basic service is composed of an encoded signal of a baseband signal subjected to superimposition,
The content of the additional service is composed of the encoded signal of the baseband signal subjected to the superimpose and the encoded signal of the baseband signal from which the superimpose is removed. Etc. can be changed by the basic service and the additional service, and the increase in signals for performing the additional service can be reduced, and the additional service can be efficiently performed.

The invention according to claim 4, while maintaining the viewing type of the basic content, a transmit device of a content service to provide a viewing form that add value,
Means for generating a signal constituting the content of the basic service;
Means for generating a signal constituting the content of the supplementary service;
The signals constituting the content of the signal and the additional services that make up the content of the basic service have a means for transmitting the multiplexed,
The content of the basic service is composed of an encoded signal of a baseband signal subjected to superimposition,
The content of the additional service is composed of the encoded signal of the baseband signal subjected to the superimpose and the encoded signal of the baseband signal from which the superimpose is removed. Signals constituting each content of the additional service can be transmitted.

  According to the present invention, it is possible to add a service by changing the presence / absence of superimpose between the basic service and the additional service.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the present invention, in addition to transmitting a superimposed video as a basic service from a broadcasting station transmission device in the same way as in the past, a video without superimposition or a video removing superimposition is added. Send as a service. Here, the video from which the superimpose is removed is the video before superimposing, and the video from which the superimpose is removed is the video before superimposing and the video before superimposing. And a clean video before superimposing a portion where superimposition is performed and its vicinity. With a conventional receiving apparatus that does not have a function for supporting additional services, it is possible to view a video superimposed with a transmitting apparatus, that is, a basic service as usual. On the other hand, a receiving apparatus having a function corresponding to an additional service can view a video that is not superimposed, that is, an image of the additional service.

  FIG. 1 is a block diagram of a first embodiment of a digital broadcasting system to which the content service method of the present invention is applied. In the figure, the transmission apparatus 10 adds a time and a breaking news subtitle pattern to the video / audio input by the superimposing unit 11 to perform superimposing and supplies the result to the encoding unit 12. In the encoding unit 12, the superimposed video / audio (baseband signal) is encoded by an encoding method such as MPEG-2 and supplied to the multiplexing unit 16. Further, the PMT generation unit 13 generates a PMT that designates the packet ID of the TS packet that transmits the encoded signal for superimposition and supplies the PMT to the multiplexing unit 16.

  On the other hand, the input video / audio (baseband signal) that has not been superimposed by the encoding unit 14 is encoded by an encoding method such as MPEG-2 and supplied to the multiplexing unit 16. Further, the PMT generation unit 15 generates a PMT that specifies the packet ID of the TS packet that transmits the non-superimpose encoded signal, and supplies the PMT to the multiplexing unit 16.

  The PAT generation unit 17 generates a PAT that specifies the packet ID of the TS packet that transmits the PMT, and supplies the PAT to the multiplexing unit 16. The multiplexing unit 16 generates a multiplexed signal for superimposing, generates a multiplexed signal for non-superimposing, multiplexes these multiplexed signals, and transmits them. The basic service content is composed of output signals from the encoding unit 12 and the PMT generation unit 13, and the supplementary service content is composed of output signals from the encoding unit 14 and the PMT generation unit 15.

  In the additional service-compatible receiving device 20, the demultiplexing unit 21 separates the multiplexed signal for superimpose and the multiplexed signal for non-superimpose from the received multiplexed signal. The demultiplexing unit 21 supplies an encoded video / audio signal for superimposing to the decoding unit 23 according to the selection instruction from the PAT / PMT interpretation and service control unit 22, for superimposing or non-superimposing. An encoded video / audio signal for pause is supplied to a recording / reproducing apparatus (not shown), and superimposed and non-superimposed PMTs are supplied to the PAT / PMT interpretation and service control unit 22.

  Note that the PAT / PMT interpretation and service control unit 22 is set with, for example, a card that stores contract information as content usage conditions, and the PAT / PMT interpretation and service control unit 22 uses the PAT / PMT interpretation to multiplex signals. A basic service / additional service selection instruction is automatically issued according to the program structure and contract. As a result, if the supplementary service contract is made, the non-superimpose video / audio encoded signal is supplied to the recording / reproducing apparatus, and if the supplementary service contract is not made, the superimpose video / audio is made. Are supplied to the recording / reproducing apparatus.

  The encoded video / audio signals for superimposition are decoded by the decoding unit 23 and presented as video / audio by the presentation unit 25. The content in the case of viewing in real time is the content of the basic service that is superimposed of hourly reports and breaking news.

  When there is a contract for an additional service, a non-superimposed video / audio encoded signal that is not superimposed on the additional service hourly or breaking news is recorded and reproduced from the demultiplexer 21 for recording. Supplied to the device. Also, a video / audio encoded signal that is not superimposed on a time report or breaking news that has been reproduced by the recording / reproducing apparatus is supplied to the decoding unit 23 to be decoded and presented in the presentation unit 24.

  Accordingly, the content to be viewed by playback is a clean content that is not superimposed of hourly reports or breaking news. Note that the additional service may be configured as a premium service that requires a separate contract such as a paid contract, for example, by scrambling.

  The receiving device 30 is a general receiving device corresponding to a basic service that does not have an optional function, and a demultiplexing unit 31 receives a multiplexed signal for superimposing and a multiplexed signal for non-superimposing from a received multiplexed signal. To separate. The demultiplexing unit 31 supplies the superimposed video / audio encoded signal to the decoding unit 33 in accordance with the PAT / PMT interpretation and the selection instruction from the service control unit 32, and converts the superimposing PMT into the PAT / PMT. The PMT interpretation and service control unit 32 is supplied.

  The PAT / PMT interpretation and service control unit 32 issues an instruction to select a basic service in accordance with the multiplexed signal program structure based on the PAT / PMT interpretation. The encoded video / audio signals of the basic service are decoded by the decoding unit 33 and presented as video / audio by the presentation unit 34.

  FIG. 2 shows a block diagram of a second embodiment of a digital broadcasting system to which the content service method of the present invention is applied. In this embodiment, as the video / audio for removing the superimpose, a clean video / audio before superimposing the portion where superimposition is performed and its vicinity is used.

  In the figure, the transmitting apparatus 40 adds the time and breaking news subtitle pattern to the video / audio input by the superimposing unit 41 to perform superimposing and supplies the result to the encoding unit 42. In the encoding unit 42, the superimposed video / audio (baseband signal) is encoded by an encoding method such as MPEG-2 and supplied to the multiplexing unit 47. In addition, the PMT generation unit 43 generates a PMT that designates the packet ID of the TS packet that transmits the encoded signal for superimposition and supplies the PMT to the multiplexing unit 47.

  On the other hand, the superimpose part extraction unit 44 obtains the clean video / audio of the target part where the time and the breaking news subtitle pattern are superimposed from the input clean video / audio before superimposition. Extract. The extracted video / audio (baseband signal) is encoded together with the position and range of the extracted video by the partial encoding unit 45 using an encoding method such as MPEG-2 and supplied to the multiplexing unit 47. Further, the PMT generation unit 46 generates a non-superimpose PMT and supplies it to the multiplexing unit 47.

  The PAT generation unit 48 generates a PAT that specifies the packet ID of the TS packet that transmits the PMT, and supplies the PAT to the multiplexing unit 47. The multiplexing unit 47 generates a multiplexed signal for superimposing, generates a multiplexed signal for non-superimposing, multiplexes these multiplexed signals, and transmits them. The basic service content is composed of output signals of the encoding unit 42 and the PMT generation unit 43, and the supplementary service content is composed of output signals of the encoding units 42 and 45 and the PMT generation unit 46.

  By the way, when the superimpose is not performed, the content for removing the superimpose is 0 or empty (no data), that is, the content for removing the superimpose may not be sent. For example, when sending the difference video between the superimposed video and the video before superimposing as the content to remove the superimpose, the superimposition is performed without sending the difference video. It is also possible to process the empty area as empty. By doing so, it is possible to reduce the amount of transmission data for performing the additional service.

  In the additional service-compatible receiving device 50, the demultiplexing unit 51 separates the multiplexed signal for superimpose and the multiplexed signal for non-superimpose from the received multiplexed signal. The demultiplexing unit 51 supplies an encoded video / audio signal for superimposing to the decoding unit 53 and a recording / reproducing apparatus (not shown) according to the selection instruction from the PAT / PMT interpretation and service control unit 52, and The video / audio encoded signal for pause is supplied to the recording / reproducing apparatus, and the PMT for superimposing and non-superimposing is supplied to the PAT / PMT interpretation and service control unit 52.

  Note that the PAT / PMT interpretation and service control unit 52 is set with, for example, a card storing contract information, and the PAT / PMT interpretation and service control unit 52 responds to the program configuration of multiple signals by PMT interpretation and the contract. Automatically instructing selection. As a result, if the supplementary service is contracted, the superimposed and non-superimpose video / audio encoded signals are supplied to the recording / reproducing apparatus. If the supplementary service is not contracted, the superimpose is performed. Only the encoded video / audio signals are supplied to the recording / reproducing apparatus.

  The encoded video / audio signal for superimposition is decoded by the decoding unit 53, and is presented as video / audio by the presentation unit 56 via the synthesis unit 55. The content in the case of viewing in real time is the content of the basic service that is superimposed of hourly reports and breaking news.

  If you have a contract for additional services, the encoded video / audio signal for non-superimpose, which is the video / audio for the superimpose part of the hourly or breaking news, is encoded for superimpose video / audio. Together with the signal, the signal is supplied from the demultiplexer 51 to a recording / reproducing apparatus (not shown) for recording. The encoded signal of the non-superimpose partial video / audio reproduced by the recording / reproducing apparatus is supplied to the partial decoding unit 54 and decoded, and the position of the portion is displayed together with the clean video / audio of the superimpose portion. And range parameters are obtained. Also, the superimposed video / audio encoded signal reproduced by the recording / reproducing apparatus is supplied to the decoding unit 53 and decoded.

  In the superimposing video / audio, the superimposing portion whose position and range are indicated by parameters is replaced with a clean video / audio for non-superimposing and synthesized, and then synthesized. The video / audio for is changed. The changed video / audio is presented by the presentation unit 56. Accordingly, the content to be viewed by playback is a clean content that is not superimposed of hourly reports or breaking news.

  It should be noted that the scramble may be used to make the additional service a premium service that requires a separate contract such as a paid contract. Instead of recording the encoded video / audio signals for superimposing and non-superimposing on the recording / playback device, the video is synthesized by decoding and synthesizing the video / audio for superimposing and non-superimposing. -The structure which records a sound on a recording / reproducing apparatus may be sufficient.

  The receiving device 30 is a general receiving device corresponding to a basic service that does not have an optional function, and a demultiplexing unit 31 receives a multiplexed signal for superimposing and a multiplexed signal for non-superimposing from a received multiplexed signal. To separate. The demultiplexing unit 31 supplies video / audio for superimposing to the decoding unit 33 in accordance with the selection instruction from the PAT / PMT interpretation and service control unit 32, and the PMT for superimposing is subjected to PAT / PMT interpretation and service. It supplies to the control part 32.

  The PAT / PMT interpretation and service control unit 32 issues an instruction to select a basic service in accordance with the multiplexed signal program structure based on the PAT / PMT interpretation. The video / audio for superimposition is decoded by the decoding unit 33 and presented as video / audio by the presentation unit 34.

  FIG. 3 shows an embodiment of a video in which time information and breaking news are superimposed. Here, the area is set separately for hourly reports and breaking news. The time report area is a rectangular area having a width W1 and a height H1 starting from the position (X1, Y1) at the top left of the screen, and the news breaking area is the width W2 height starting from the position (X2, Y2). It becomes a rectangular area of H2. Then, the number N of regions, the positions Xn and Yn of each region, the width and height Wn and Hn, and a clean video of each region are encoded.

  Note that the regions may be set for the convenience of encoding, such as combining a plurality of adjacent superimpose regions into one region or dividing one superimpose region into smaller regions. Here, it is desirable that the clean video coding scheme and coding parameters are the same as the basic service video coding scheme and coding parameters. Therefore, for example, when the MPEG-2 system is used, it is desirable that Xn, Yn, Wn, and Hn are multiples of 8 to match the macroblock. However, there is a selection that does not care about the matching of the macro block boundary between the video of the basic service and the video of the additional service. In this case, Xn and Yn may be arbitrary values.

  In this embodiment, the increase in the signal for performing the additional service is small, and the additional service can be performed efficiently.

  In the first and second embodiments, the video has been described, but the same can be done for audio. In the breaking news, a warning sound is output together with a superimposition of subtitles. For this reason, the alarm sound is removed from the content of the additional service. For example, a region to be encoded in the spatial domain is extracted from the video, but a region to be encoded in the frequency domain can be extracted from the audio. For audio, since the amount of encoded data is smaller than that of video, there is no problem even if the entire area is encoded.

  In addition, the basic service and the additional service may be scrambled. For example, the basic service scrambles for copyright protection, and the additional service scrambles for pay broadcasting. In this case, it is necessary to scramble with a common key for common components such as video and audio for basic services, but it is possible to scramble with independent keys for independent components such as partial video and audio for additional services. it can.

  In the first and second embodiments, digital broadcasting has been described as an example. However, the present invention is not limited to digital broadcasting, and can be applied to, for example, a content service using the Internet, and is not limited to the above embodiment. Absent. Also, the transmission path may be different such that the content of the basic service is transmitted by broadcasting and the content of the additional service is transmitted by the Internet or server type broadcasting. Also, the encoding method is not limited to the MPEG-2 encoding method. In FIGS. 1 and 2, each of the PMT generation unit, the PAT generation unit, the PAT / PMT interpretation, and the service control unit is essential in the present invention. Is not a component of

1 is a block diagram of a first embodiment of a digital broadcasting system to which a content service method of the present invention is applied. It is a block diagram of 2nd Embodiment of the digital broadcasting system to which the content service method of this invention is applied. It is a figure which shows one Embodiment of the image | video on which the hourly report and the breaking news were superimposed. It is a block diagram of an example of the digital broadcasting system which performs the conventional superimpose.

Explanation of symbols

10, 40 Transmitting device 11 Superimpose unit 12, 14 Encoding unit 13, 15 PMT generating unit 16, 47 Multiplexing unit 17, 48 PAT generating unit 20, 30, 50 Receiving device 21, 51 Demultiplexing unit 22, 32, 52 PAT / PMT Interpretation and Service Control Unit 23, 31, 53 Decoding Unit 24, 34, 56 Presentation Unit 54 Partial Decoding Unit 55 Synthesis Unit

Claims (6)

A content service receiving device that provides a viewing mode with added value while maintaining a basic content viewing mode,
Means for receiving signals constituting the basic service content and the additional service content transmitted from the transmission device;
Means for outputting the content of the received basic service when the content usage condition set in the own apparatus is a basic service, and outputting the content of the received additional service when the content usage condition set in the own apparatus is an additional service I have a,
The content of the basic service is composed of an encoded signal of a baseband signal subjected to superimposition,
The content of the additional service is composed of an encoded signal of a baseband signal subjected to the superimpose and an encoded signal of a baseband signal from which the superimpose is removed . The receiving device according to claim 1,
The baseband signal for removing the superimpose is a baseband signal that is a difference between the baseband signal subjected to the superimpose and the baseband signal before the superimposition. . The receiving device according to claim 1,
The baseband signal for removing the superimpose is a baseband signal before the superimpose in the vicinity of the portion where the superimposition is performed and in the vicinity thereof . While maintaining viewing type of the basic content, a transmit device of a content service to provide a viewing form that add value,
Means for generating a signal constituting the content of the basic service;
Means for generating a signal constituting the content of the supplementary service;
The signals constituting the content of the signal and the additional services that make up the content of the basic service have a means for transmitting the multiplexed,
The content of the basic service is composed of an encoded signal of a baseband signal subjected to superimposition,
The content of the additional service is composed of an encoded signal of a baseband signal subjected to the superimpose and an encoded signal of a baseband signal from which the superimpose is removed . The transmission device according to claim 4, wherein
  The baseband signal from which the superimpose is removed is a baseband signal that is a difference between the baseband signal that has been subjected to superimposition and the baseband signal that has not been superposed. . The transmission device according to claim 4, wherein
  The transmission apparatus according to claim 1, wherein the baseband signal for removing the superimpose is a baseband signal before the superimposition in the vicinity of the portion where the superimposition is performed and in the vicinity thereof.

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