JP2014183416A - Device and system for digital broadcast multiplexing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select whether or not to display character superimposition information with a simple operation.SOLUTION: A digital broadcast multiplexing device for multiplexing and outputting a plurality of types of information includes: edition means (a time stamp edition unit 104) for adding or deleting a time stamp indicative of reproduction timing for a packet that includes image information and/or character information included in the plurality of types of information to be multiplexed; and when a time stamp is added or deleted by the edition means, correction means (a PMT edition unit 108) for correcting a PMT (Program Map Table) according to the edition or deletion.

Description

  The present invention relates to a digital broadcast multiplexing apparatus and a digital broadcast multiplexing system.

  In Patent Document 1, the transmitting side detects a PCR (Program Clock Reference) from the MPEG transport stream, attaches a sync time corresponding to the detected PCR, and the receiving side performs playback according to the sync time. A technique capable of accurately transmitting and receiving a transport stream by performing this is disclosed.

Japanese Patent Laid-Open No. 08-149428

  By the way, in the technique disclosed in Patent Document 1, by using PCR, subtitle information that displays a translation sentence in synchronization with video / audio is displayed by operating a remote controller, for example. Alternatively, the non-display can be easily selected. However, there has been a problem that such selection cannot be made for character super information that can be arbitrarily displayed asynchronously with video and audio.

  The present invention has been made in view of the above points, and provides a digital broadcast multiplexing apparatus and a digital broadcast multiplexing system capable of selecting display or non-display of character super information by a simple operation. The purpose is that.

In order to solve the above problems, the present invention provides a digital broadcast multiplexing apparatus that multiplexes and outputs a plurality of types of information, and includes image information and / or characters included in the plurality of types of information to be multiplexed. An editing unit that adds or deletes a time stamp indicating reproduction timing to a packet including information, and when the time stamp is added or deleted by the editing unit, a PMT (Program Map) is added according to the addition or deletion. Correction means for correcting (Table).
According to such a configuration, display or non-display of character super information can be selected by a simple operation.

In another aspect of the present invention, the image information and / or character information is character super information, and the editing unit adds a time stamp to a packet of character super information.
According to such a configuration, it is possible to easily select display or non-display of the character super information by converting the character super information into subtitle information.

Further, according to one aspect of the present invention, the editing unit generates an STC (System Time Clock) based on a PCR (Program Clock Reference) included in a TS (Transport Stream) including the plurality of types of information, and the STC The time stamp is added based on the above.
According to such a configuration, an STC can be generated based on PCR, and a time stamp can be easily generated.

Also, one aspect of the present invention is characterized in that the image information and / or character information is subtitle information, and the editing unit deletes a time stamp from the subtitle information packet.
According to such a configuration, it is possible not only to convert the superimpose into a caption, but also to convert the caption into a character superposition.

Further, the present invention provides a digital broadcast multiplexing system in which a plurality of types of information are multiplexed and transmitted from a transmission device and received by a reception device, and the transmission device includes the plurality of types of information to be multiplexed. An editing unit that adds or deletes a time stamp indicating reproduction timing with respect to a packet including image information and / or character information included therein, and when the time stamp is added or deleted by the editing unit, the addition or deletion And a correction unit that corrects a PMT (Program Map Table). The reception device refers to the time stamp, and adjusts the packet reproduction timing. And reproducing means for reproducing the packet based on the adjusted timing.
According to such a configuration, it is possible to easily select display or non-display of the character super information by converting the character super information into subtitle information.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the digital broadcast multiplexing apparatus and digital broadcast multiplexing system which can perform display or non-display selection of character super information by simple operation.

It is a figure which shows the structural example of the digital broadcasting multiplexing system which has a digital broadcasting multiplexing apparatus which concerns on embodiment of this invention. It is a figure which shows the detailed structural example of the transmitter shown in FIG. It is a figure which shows the detailed structural example of the receiver shown in FIG. 3 is a timing chart for explaining the operation of the transmission apparatus shown in FIG. 2. 3 is a timing chart for explaining the operation of the transmission apparatus shown in FIG. 2. 4 is a flowchart for explaining an example of processing executed in the transmission device shown in FIG. 1.

  Next, an embodiment of the present invention will be described.

(A) Description of Configuration of Embodiment FIG. 1 is a diagram illustrating a configuration example of a digital broadcast multiplexing system including a digital broadcast multiplexing apparatus according to an embodiment of the present invention. As shown in FIG. 1, a digital broadcast multiplexing system 1 according to an embodiment of the present invention includes a transmission side device 10 and a reception side device 20. Here, the transmission side apparatus 10 includes a transmission apparatus 100, a TS (Transport Stream) generation apparatus 120, and a character super generation apparatus 130 according to the digital broadcast multiplexing apparatus of the present invention. In addition, the receiving-side device 20 includes a receiving device 200 and a display / playback device 220.

  The TS generation device 120 constituting the transmission side device 10 generates and outputs a transport stream (TS) including video, audio, subtitles, character superimposition, and PCR (Program Clock Reference). Here, the subtitle is information such as a translation that is displayed in synchronization with video / audio, and is displayed based on an STC (System Time Clock) generated according to PCR. The character super generator 130 generates and outputs a character super. Here, the character supermarket is information such as emergency information such as earthquake bulletins, news bulletins, road traffic information, and bulletin bulletins, which is displayed asynchronously with video and audio. This information is displayed regardless of the STC.

  The transmission device 100 multiplexes information such as a TS output from the TS generation device 120 and a character super output from the character super generation device 130 and transmits the multiplexed information to the reception device 200 as a radio wave.

  FIG. 2 is a diagram illustrating a detailed configuration example of the transmission device 100 illustrated in FIG. 1. As shown in this figure, the transmission apparatus 100 includes a decomposition unit 101, a selection unit 102, an STC playback unit 103, a time stamp editing unit 104, a character super generation unit 105, a text generation unit 106, a control unit 107, a PMT (Program Map Table) an editing unit 108, a synthesis unit 109, and a transmission unit 110.

  The disassembling unit 101 receives the TS output from the TS generation device 120, extracts the video / audio and outputs it to the synthesizing unit 109, extracts the subtitle (or character super), and outputs it to the selecting unit 102. The PCR is extracted and output to the STC reproduction unit 103.

  The selection unit 102 selects a character super (or subtitle) output from the decomposing unit 101, the character super generation device 130, or the character super generation unit 105, and outputs it to the time stamp editing unit 104.

  The STC regeneration unit 103 performs an STC count operation in synchronization with a clock signal supplied from a built-in clock signal generation unit (not shown), and adjusts the STC based on the PCR supplied from the decomposition unit 101. The STC generated by the STC playback unit 103 is supplied to the time stamp editing unit 104.

  The time stamp editing unit 104 adds a time stamp to the character super supplied from the selection unit 102 under the control of the control unit 107, and outputs it to the synthesis unit 109. Alternatively, according to the control of the control unit 107, the time stamp is deleted from the subtitle supplied from the selection unit 102 and output to the synthesis unit 109.

  The text generation unit 106 generates and outputs text to be displayed as a character supermarket. The character super generator 105 generates a character super based on the text output from the text generator 106 and outputs it to the selector 102.

  The control unit 107 controls the selection unit 102, the time stamp editing unit 104, and the PMT editing unit 108 based on a program stored in a semiconductor storage device (not shown).

  The PMT editing unit 108 edits a PMT that is a table indicating the type of information stored in each of the packets included in the signal output from the combining unit 109.

  The synthesizing unit 109 synthesizes the video / audio output from the decomposing unit 101, the subtitles or the character superimpose output from the time stamp editing unit 104, and the PMT edited by the PMT editing unit 108, and sends the synthesized result to the transmitting unit 110. Output.

  Transmitting section 110 converts the signal output from combining section 109 into a radio wave and transmits it to receiving apparatus 200.

  The receiving device 200 receives the radio wave transmitted from the transmitting device 100, separates multiplexed information, performs synchronization control, generates a video signal, and outputs the video signal to the display / playback device 220. The display / reproduction device 220 displays and reproduces the video signal output from the reception device 200.

  FIG. 3 is a diagram illustrating a detailed configuration example of the reception device 200 illustrated in FIG. 1. As shown in this figure, the receiving device 200 includes a receiving unit 201, a separating unit 202, a video decoding unit 203, an audio decoding unit 204, a caption decoding unit 205, a character super decoding unit 206, a synchronization control unit 207, and a synthesis unit. 208.

  Here, the receiving unit 201 receives the radio wave transmitted from the transmitting unit 110, converts it into an electrical signal, and outputs it. The separation unit 202 separates and outputs video, audio, subtitles, and character superimposition from the electrical signal supplied from the reception unit 201. The video decoding unit 203 acquires the video separated by the separation unit 202, performs decoding processing, and then outputs the video to the synchronization control unit 207. The voice decoding unit 204 acquires the voice separated by the separation unit 202, performs decoding processing, and then outputs it to the synchronization control unit 307. The subtitle decoding unit 205 acquires the subtitles separated by the separation unit 202, performs decoding processing, and then outputs them to the synchronization control unit 307. The character super decoding unit 206 acquires the character super separated by the separating unit 202, performs a decoding process, and then outputs it to the synthesizing unit 208.

  The synchronization control unit 207 adjusts the information output from the video decoding unit 203, the audio decoding unit 204, and the subtitle decoding unit 205 so as to be synchronized according to the PCR, and outputs the information to the synthesis unit 208. The synthesizing unit 208 synthesizes the video, audio, subtitles, and character superimpose output from the synchronization control unit 207 and outputs the synthesized result to the display / playback device 220.

(B) Description of Configuration of Embodiment Next, the operation of the embodiment of the present invention will be described. The TS output from the TS generation device 120 is supplied to the decomposition unit 101, where video / audio is extracted and supplied to the synthesis unit 109. The decomposition unit 101 extracts a character or a character superscript from the TS and supplies it to the selection unit 102. Further, the decomposing unit 101 extracts PCR from the TS and supplies it to the STC reproducing unit 103. The STC regeneration unit 103 counts the STC based on the clock signal output from the built-in clock signal generation unit, and finely adjusts the count value of the STC according to the PCR supplied from the decomposition unit 101, The obtained STC is supplied to the time stamp editing unit 104.

  The selection unit 102 selects either the character super or subtitle supplied from the decomposition unit 101, the character super supplied from the character super generation device 130, or the character super supplied from the character super generation unit 105 of the control unit 107. This is selected according to the control and supplied to the time stamp editing unit 104.

  The time stamp editing unit 104 adds a PTS corresponding to the STC value of the STC reproduction unit 103 to the character super supplied from the selection unit 102 under the control of the control unit 107. In addition, the time stamp editing unit 104 deletes the PTS from the subtitles supplied from the selection unit 102 under the control of the control unit 107.

  FIG. 4 is a diagram for explaining the operation when no PTS is added to the character super information. In this figure, the horizontal axis indicates time. 4A to 4D show video, audio, and subtitles, respectively. As described above, the PTS for synchronizing the reproduction timing is added to these packets, and the reproduction timing of video, audio, and subtitles can be synchronized by reproducing according to the PTS in the receiving apparatus 200. it can. Note that PTS is not normally added to the character super shown in FIG. For this reason, synchronization control is not performed for the character super.

  FIG. 5 shows an example where the time stamp editing unit 104 adds PTS to the character superimposition. In this example, PTS = 100 and PTS = 200 are added to the video, audio, and subtitle packets, and PTS = 120 and PTS = 240 are added to the character super packet shown in FIG. Yes. Note that such a PTS is assigned with reference to the STC value of the STC playback unit 103, for example, at the timing when a character super is input to the time stamp editing unit 104. As a result, unlike the normal character super packet, the PTS is added to the character super output from the time stamp editing unit 104. Note that, for example, since it is not necessary to synchronize the character superimpose with the video or the like, the PTS value added to the character supermarket is different from the PTS attached to the video or the like as shown in FIG. May be different.

  As described above, the character super to which the PTS is added as necessary by the time stamp editing unit 104 is supplied to the synthesis unit 109. When the PTS is added to the character superimpose by the time stamp editing unit 104, the PMT editing unit 108 generates and outputs a PMT corresponding to the changed configuration. More specifically, since the PMT stores PID (Packet ID (Idetification)) such as video and audio included in a certain program, if a PTS is given to the character superimpose, it will be displayed as subtitles on the system. Since the determination is made, the PID of the character supermarket including this PTS is stored in the PMT as the subtitle PID. The PMT generated in this way is output from the PMT editing unit 108 to the combining unit 109.

  The synthesizing unit 109 synthesizes the video / audio supplied from the decomposing unit 101, the character super or subtitle supplied from the time stamp editing unit 104, and the PMT supplied from the PMT editing unit 108, and supplies them to the transmitting unit 110. To do. The transmission unit 110 converts the signal supplied from the synthesis unit 109 into a radio wave and transmits it to the reception device 200.

  As described above, the radio wave transmitted from the transmission device 100 is received by the reception unit 201 of the reception device 200. The receiving unit 201 converts the received radio wave into a corresponding electric signal and outputs it to the separation unit 202. The separation unit 202 separates the electric signal supplied from the reception unit 201 into video, audio, subtitle, and character super packets, and the video decoding unit 203, the audio decoding unit 204, the subtitle decoding unit 205, and the character super The data are supplied to the decoding unit 206, respectively.

  Here, as shown in FIG. 4, in the case of a normal character super with no PTS added, this character super is supplied to the character super decoding unit 206. The character super decoding unit 206 decodes the character super supplied from the separation unit 202 and supplies the decoded character to the synchronization control unit 207. The synchronization control unit 207 adjusts and outputs video, audio, and subtitle timings. The synthesizing unit 208 synthesizes and outputs the video, audio, and subtitles output from the synchronization control unit 207 and the character super output from the character super decoding unit 206. The signal output from the synthesizing unit 208 is supplied to the display / playback device 220, and is displayed on the display unit as video, subtitles, and superimpose characters, and is emitted as sound from the speaker.

  On the other hand, as shown in FIG. 5, when a PTS is added to the character super, the character super supplied from the receiving unit 201 is treated as caption information, and the separating unit 202 uses the character super added with the PTS. This is supplied to the caption decoding unit 205. The subtitle decoding unit 205 decodes the character super like the subtitle. When the decoding process ends, the caption decoding unit 205 outputs the character super with the PTS added to the synchronization control unit 207.

  The synchronization control unit 207 refers to the PTS value for the character super to which video, audio, and PTS output from the video decoding unit 203, the audio decoding unit 204, and the subtitle decoding unit 205 are added, as shown in FIG. After adjusting so that the timing is the same as the timing chart, output. The synthesizing unit 208 outputs a signal obtained by synthesizing the character super added with the video, audio, and PTS supplied from the synchronization control unit 207 and the character super output from the character super decoding unit 206. To do. The signal output from the combining unit 208 is supplied to the display / playback device 220. The display / playback device 220 displays the video, audio, subtitles, and character supertext supplied from the receiving device 200 on the display unit.

  By the way, the display / playback apparatus 220 selects whether to display or hide subtitles on the display unit by operating an operation unit of a remote controller (not shown) or operating the operation unit of the main body. Can do. Among the signals supplied from the receiving device 200, the super character to which the PTS is added in the transmitting device 100 is treated as a caption, so the operation unit of the remote controller or the operation unit of the display / playback device 220 described above is operated. By doing so, the necessity of the display on a display part can be selected.

  As described above, according to the embodiment of the present invention, the transmitting apparatus 100 adds the PTS to the character super as necessary, so that the receiving apparatus 200 can perform the character operation with a simple operation. It becomes possible to select whether or not to display the supermarket.

  Next, an example of processing executed in the transmission device 100 shown in FIG. 2 will be described with reference to FIG. When the processing of the flowchart shown in FIG. 6 is started, the following steps are executed.

  In step S <b> 11, the STC reproduction unit 103 acquires the PCR from the decomposition unit 101. More specifically, the STC reproduction unit 103 acquires the PCR included in the TS supplied from the TS generation device 120 and extracted by the decomposition unit 101.

  In step S12, the STC playback unit 103 generates an STC. More specifically, the STC reproduction unit 103 performs an STC count operation based on a built-in clock signal, and adjusts the STC count value by PCR supplied from the decomposition unit 101.

  In step S13, the control unit 107 determines whether or not a character superscript is input. If it is determined that the character superimpose has been input (step S13: Yes), the control unit 107 proceeds to step S14, and otherwise (step S13). : No), the process proceeds to step S17. More specifically, the control unit 107 determines whether or not a character superimpose is input from the selection unit 102 to the time stamp editing unit 104. If it is determined that the character superimposition is input, the control unit 107 proceeds to step S14. In this case, the process proceeds to step S17.

  In step S14, for example, the control unit 107 determines whether or not the administrator of the transmission apparatus 100 has instructed subtitle conversion of the character superimposition, and determines that the instruction has been given (step S14: Yes). Proceeds to step S15, otherwise proceeds to step S17 (step S14: No).

  In step S <b> 15, the time stamp editing unit 104 refers to the STC of the STC playback unit 103 and adds a PTS that is a time stamp to the character super supplied from the selection unit 102. As a result, PTS is added to the character supermarket as shown in FIG.

  In step S <b> 16, the PMT editing unit 108 edits the PMT according to the addition of the PTS in step S <b> 15 and outputs the PMT to the combining unit 109. More specifically, when the character superimposition is changed to a subtitle, or when the subtitle is changed to a character superposition, the information stored in the PMT changes, so that the PMT editing unit 108 responds to the change contents. To edit and output the PMT.

  In step S17, the control unit 107 determines whether or not to continue the process. If it is determined that the process is to be continued (step S17: Yes), the process returns to step S11 and the same process as described above is repeated and continued. If it is determined not to do so (step S17: No), the process ends.

  According to the above processing, the transmitting apparatus 100 can add a PTS to the character superimpose as necessary to make a caption. As a result, the display / playback device 220 can easily select whether or not to display the character super.

(E) Description of Modified Embodiment Each of the above embodiments is an example, and it is needless to say that the present invention is not limited to the case described above. For example, in the above embodiment, the transmitting apparatus 100 adds the PTS, which is a time stamp, to the character supermarket. . According to such an embodiment, subtitles cannot be synchronized with video and audio, but by treating the subtitles as a character superimposition, the subtitles can be kept displayed when necessary.

  In the above embodiment, when subtitles are instructed, PTSs are added to all character supers. For example, PTSs may be added only to specific character supers. . For example, for information with high urgency such as earthquake information or tsunami information, PTS may not be added even when captioning is instructed. As a result, information with high urgency can be reliably displayed even when non-display of subtitles is selected in the display / playback apparatus 220.

  In the above embodiment, the case where the character superimposition is character information (text information) has been described as an example. However, for example, when the character superimposition is image information, or both the character information and the image information are Even if it is included, the present invention can be applied.

  Moreover, although the case where the character superimposing was made into a subtitle | subtitle was demonstrated as an example in the above embodiment, while a character superimposing was made into a subtitle, you may make it make a character superimpose parallel. More specifically, the PTS is added to the character superimposing to make it a caption, the PTS is deleted from the subtitle to make the character superimposing, and the PMT is corrected based on these changes.

DESCRIPTION OF SYMBOLS 1 Digital broadcast multiplexing system 10 Transmission side apparatus 20 Reception side apparatus 100 Transmission apparatus 101 Decomposition part 102 Selection part 103 STC reproduction part 104 Time stamp edit part (editing means)
105 Character super generation unit 106 Text generation unit 107 Control unit 108 PMT editing unit (correction means)
109 synthesizing unit 110 transmitting unit 120 TS generating device 130 character super generating device 200 receiving device 201 receiving unit 202 separating unit 203 video decoding unit 204 audio decoding unit 205 subtitle decoding unit 206 character super decoding unit 207 synchronization control unit (adjustment means)
208 Synthesizer (reproduction means)
220 Display / playback device

Claims (5)

In a digital broadcast multiplexing device that multiplexes and outputs multiple types of information,
Editing means for adding or deleting a time stamp indicating reproduction timing to a packet including image information and / or character information included in the plurality of types of information to be multiplexed;
When the time stamp is added or deleted by the editing means, a correction means for correcting a PMT (Program Map Table) according to the addition or deletion;
A digital broadcast multiplexing apparatus characterized by comprising: The image information and / or character information is character super information,
The editing means adds a time stamp to the packet of character super information;
The digital broadcast multiplexing apparatus according to claim 1. The editing unit generates an STC (System Time Clock) based on a PCR (Program Clock Reference) included in a TS (Transport Stream) including the plurality of types of information, and adds the time stamp based on the STC. ,
The digital broadcast multiplexing apparatus according to claim 2, wherein: The image information and / or character information is subtitle information,
The editing means deletes a time stamp from the packet of subtitle information;
The digital broadcast multiplexing apparatus according to any one of claims 1 to 3, wherein In a digital broadcast multiplexing system in which multiple types of information are multiplexed and transmitted from a transmission device and received by a reception device,
The transmitter is
Editing means for adding or deleting a time stamp indicating reproduction timing to a packet including image information and / or character information included in the plurality of types of information to be multiplexed;
Correction means for correcting a PMT (Program Map Table) according to the addition or deletion when the time stamp is added or deleted by the editing means;
The receiving device is:
Adjusting means for adjusting the reproduction timing of the packet with reference to the time stamp;
Reproducing means for reproducing the packet based on the timing adjusted by the adjusting means,
A digital broadcast multiplexing system characterized by that.

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