JP2008053991A - Digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a user to easily change a character size or character arrangement of a caption when reproducing composite images and to allow a capacity of a storage device to be used most efficiently. <P>SOLUTION: Caption data and compressed image data are stored in a video caption storage part 123 independently of each other. In response to a history display request from a general control part 14, a history control part 131 acquires caption data and a compressed image, which are stored in the video caption storage part 123, and sends them to an image decoding part 132. The image decoding part 132 decodes the compressed image out of the caption data and the compressed image sent from the history control part 131 and sends decoded video data and the caption data to a picture composition part 9. The picture composition part 9 combines these video data and caption data and displays a result on an LCD 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiving apparatus that receives a digital broadcast transmitted by multiplexing video data and caption data.

  In digital broadcasting, a broadcast wave in which data such as video, audio, and subtitles is multiplexed is transmitted. Each of these data is sent in a data structure called a PES (Packetized Elementary Stream) packet. In the PES packet, data in which video and caption are encoded, display time information indicating the display time of the data, and the like are arranged.

  As a video compression method, MPEG2 is used for BS, CS, and digital terrestrial broadcasting, and H.264 is used for one-segment broadcasting that is a terrestrial digital broadcast for mobiles. H.264 is used. In MPEG2, I picture, In H.264, data encoded in one image called an IDR picture is used as a reference, and the difference from the previous image is encoded in subsequent images. Thus, by encoding the difference, the amount of data necessary for encoding is reduced.

  As characters displayed simultaneously with video, there are characters displayed in an image as a part of video data and character data transmitted by a signal different from the video data. The subtitle here refers to the latter character data (hereinafter also referred to as subtitle data). Such subtitle data of a subtitle includes a subtitle text and subtitle management data. In 1Seg, characters and the like actually displayed in the subtitle text are encoded. In addition, subtitle management data is control data such as what language the character data is and how many types of character data in different languages are transmitted, and information such as language type and number of languages is encoded. The characters that are actually displayed are not encoded. In addition, as a subtitle display format, 12 characters x 4 lines are recommended for vertical screen receivers, and 16 characters x 3 lines for horizontal screen receivers, but the subtitle display position is not specified. Rather, it depends on the display position set in advance for each receiver.

  As an example of a conventional digital broadcast receiving apparatus in which video and subtitles are displayed simultaneously, there is a subtitle broadcast recording apparatus and recording method disclosed in Japanese Patent Laid-Open No. 2002-344871 (Patent Document 1). In the subtitle broadcast recording apparatus and recording method disclosed in Japanese Patent Laid-Open No. 2002-344871, only the portion where the video and the subtitle are displayed is recorded in the broadcast in which the subtitle is transmitted, and only that portion is recorded later. Reproduce. Hereinafter, a conventional digital broadcast receiving apparatus disclosed in Patent Document 1 will be described with reference to FIG. FIG. 8 is a block diagram of a conventional digital broadcast receiving apparatus.

In FIG. 8, the digital broadcast signal received via the antenna is demodulated by the tuner demodulator 102, and the demodulated multiplexed digital signal is separated into a video signal and a caption signal by the multiplexed signal separator 103. The separated video signal is decoded into the original video signal by the video decoding unit 104, and at the same time, the subtitle display time required for the subtitle information analysis unit 105 to synchronize the display of the video and the subtitle from the separated subtitle signal and Analyze the caption style. The timer 107 inputs the current time to the subtitle control unit 106, and the video signal decoded by the video decoding unit 104 and the subtitle sentence analyzed by the subtitle information analysis unit 105 are combined in the OSD processing unit 108 and output to the output terminal 109. Is done. The recording unit 110 records the video output from the OSD processing unit 108 or outputs the recorded video to the output terminal 109. The system control unit 111 instructs the recording unit 110 to output the recorded video.
JP 2002-344871 A

  However, in the conventional digital broadcast receiving apparatus, when the OSD processing unit 108 synthesizes a video signal and a caption sentence, the caption is embedded as an image in the synthesized image. Some digital broadcast receivers can switch between a vertical screen and a horizontal screen, and a composite image recorded on the vertical screen may be reproduced on the horizontal screen. For example, the subtitles in the composite image are 12 characters × When embedded in 4 lines, subtitles are output in 12 characters × 4 lines regardless of the horizontal screen during playback, and the subtitle characters are displayed in a state extending in the width direction of the screen. That is, when a caption is embedded as part of an image, the display format of only the caption display area in the image cannot be changed, and the entire image needs to be changed. In addition, if the entire image is enlarged or reduced to change the subtitle display format, there is a problem that it is not always easy to see. FIG. 9 shows an example of display in which the size of the display area of the digital broadcast with captions is changed by the conventional digital broadcast receiving apparatus. FIG. 9A shows a display example before the change, and FIG. 9B shows a display example after the change. As shown in FIG. 9, when the image size is changed, the shape of the subtitle character is also changed accordingly, which may make it difficult for the viewer to identify the character. In the case of FIG. 9, even if the shape of each character of the caption in FIG. 9 (a) is appropriate, each character can be seen in a shape that is crushed from the top and bottom as in FIG. 9 (b). there is a possibility.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a digital broadcast receiving apparatus that can easily change the size and arrangement of subtitle characters during reproduction.

  The digital broadcast receiving apparatus of the present invention includes a data separation unit that separates video data and caption data from a broadcast wave in which video data and caption data are multiplexed and compressed, a video decoder that decodes the video data, and the caption data. A subtitle decoder to decode, the video data decoded by the video decoder, and the subtitle data decoded by the subtitle decoder, respectively, and the video subtitle data storage unit that records the video subtitle data storage unit. A screen composition unit that generates an image obtained by combining data and the caption data, and a display unit that outputs an image generated by the screen composition unit.

  The digital broadcast receiving method of the present invention includes a step of separating video data and subtitle data from a broadcast wave in which video data and subtitle data are multiplexed and compressed, the step of decoding the video data and the subtitle data, and the decoding of the decoded data Recording video data and decoded subtitle data, respectively, generating an image obtained by combining the stored video data and the subtitle data, and outputting the generated image. To do.

  According to this configuration, it is possible to easily edit the display format of the caption in the image at the time of playback by recording the video data and the caption data separately and using the video data and the caption data at the time of playback. In addition, it is possible to display the subtitles with better appearance than when the subtitles are edited by conventional image processing.

  In the digital broadcast receiving device of the present invention, the video subtitle data storage unit refers to the first time information included in the video data and the second time information included in the subtitle data. The video data determined to be and the subtitle data are recorded in association with each other, and the screen composition unit is associated with the video data stored in the video subtitle data storage unit and the subtitle data. An image obtained by synthesizing the video data and the caption data is generated.

  According to this configuration, since the video at the time of reproduction matches the subtitle content, the viewer can comfortably view the recorded digital broadcast.

  In the digital broadcast receiving apparatus of the present invention, the video subtitle data storage unit includes the first subtitle data included in the video data within a period including at least a time point specified by the second time information included in the subtitle data. When there is a time point specified by the time information, the video data decoded by the video decoder and the caption data decoded by the caption decoder are respectively recorded.

  Video parts with subtitles inserted are often more important than parts with no subtitles inserted, and if you play only the part where the subtitles were inserted when viewing the recorded video later, the video will be included You can almost understand the program contents. According to this configuration, by recording video data and subtitle data within a period in which subtitle data is included in the broadcast wave, only a highly important video portion in a program is recorded, so that the viewer can record the recorded program. When it is desired to roughly check the contents of the program, it is not necessary to reproduce all of the program from the beginning to the end, and it is possible to confirm the contents of the program in a short time with only the point video. Further, it is not necessary to record all of the program from the beginning to the end, and the data capacity required to record the program can be greatly reduced.

  The digital broadcast receiving apparatus of the present invention is characterized in that the video subtitle data storage unit records only the video data decoded by the video decoder when the subtitle data does not include character information. To do.

  For example, in one-segment broadcasting, the caption data is formed by a caption text composed of character data and caption management data composed of control data. The caption management data is carried by broadcast waves at intervals of about 10 seconds at the maximum, including the caption text and the caption management data. According to this configuration, by recording video data periodically, when the viewer wants to roughly check the contents of the recorded program, it is not necessary to reproduce all from the beginning to the end of the program. It is not necessary to record all of the program from the beginning to the end, and the data capacity required to record the program can be greatly reduced.

  Also, the digital broadcast receiving apparatus of the present invention has a timer for measuring time, and when the timer matches the current time and the time point specified by the second time information included in the caption data, Measurement is started, and when the time measurement by the timer exceeds a certain time, the video subtitle data storage unit decodes the video data decoded by the video decoder and the subtitle data decoded by the subtitle decoder. Each is recorded.

  Also, the digital broadcast receiving apparatus of the present invention has a timer for measuring time, the timer starts measuring time from the time when the caption data is received, and the video caption data storage unit uses the timer to measure time. When the measurement exceeds a certain time, the video data decoded by the video decoder and the caption data decoded by the caption decoder are recorded, respectively.

  According to this configuration, by recording video data periodically, when the viewer wants to roughly check the contents of the recorded program, it is not necessary to reproduce all from the beginning to the end of the program. It is not necessary to record all of the program from the beginning to the end, and the data capacity required to record the program can be greatly reduced.

  The digital broadcast receiving apparatus of the present invention further includes a data compression unit that compresses data, the data compression unit compresses at least the video data decoded by the video decoder, and the video subtitle data storage unit The video data compressed by the data compression unit and the caption data compressed by the data compression unit or decoded by the caption decoder are recorded respectively.

  According to this configuration, the amount of video data to be recorded can be reduced by compressing the video data.

  The present invention separately stores video data and subtitle data, and when reproducing video data and subtitle data for playback, by separately reading and synthesizing the video data and subtitle data stored separately, It is possible to provide a digital broadcast receiving apparatus that can easily change the size and character arrangement of subtitle characters during reproduction and at the same time can use the capacity of a storage device most efficiently.

  Hereinafter, a digital broadcast receiving apparatus according to an embodiment of the present invention will be described with reference to the drawings. Here, an embodiment of the present invention will be described in the case where the present invention is applied to one seg. However, you may use for other digital broadcasts, such as BS digital broadcast, CS digital broadcast, mobile broadcast, and terrestrial digital broadcast.

(First embodiment)
A digital broadcast receiver according to a first embodiment of the present invention is shown in FIG.
In FIG. 1, a digital broadcast receiving apparatus 1 includes an antenna 2 that receives a digital broadcast wave, a tuner 3 that receives and demodulates a channel designated by the overall control unit 14, and a voice encoding of the demodulated digital broadcast wave signal. DEMUX4 that separates data, video encoded data, subtitle encoded data, audio encoded data is decoded to obtain audio display time and audio data, and if the current time and audio display time match, the audio data is Audio decoder 5 to be sent to 6, speaker 6 that outputs decoded audio data, video encoded data is decoded to obtain video display time and video data, and if the current time and video display time match, video The video decoder 7 for sending data to the screen composition unit 9 and the caption encoded data are decoded to obtain the caption display time and caption data. In other words, when the current time and the caption display time coincide, the caption data is sent to the screen composition unit 9 and the caption decoder 8 that notifies the recording function unit 12 that the caption data has been output is combined with the video data and the caption data. A screen composition unit 9 for obtaining a composite image, an LCD 10 for outputting the composite image, a timer 11 for measuring elapsed time, a recording function unit 12 for storing video data and caption data, and recorded video data and caption data. A playback function unit 13 for playback, an overall control unit 14 for controlling the operation of each unit of the digital broadcast receiving apparatus 1, and a key input unit 15 for receiving input from the viewer and sending the information to the overall control unit 14 It is a configuration.

  The recording function unit 12 includes a video subtitle data acquisition unit 121, an image compression unit 122, and a video subtitle storage unit 123.

  The video subtitle data acquisition unit 121 includes a buffer that temporarily stores video data sent from the video decoder 7. When subtitle data is sent from the subtitle decoder 8, the subtitle data and the latest video data among the temporarily stored video data are sent to the image compression unit 122 and the timer 11 is set. Also, the video subtitle data acquisition unit 121 receives the notification that the predetermined time has elapsed from the timer 11, and the image compression unit 122 converts the latest video data of the temporarily stored video data and arbitrary subtitle data. And the timer 11 is set again. Here, the arbitrary subtitle data may be subtitle data with only blank characters, subtitle management data, or subtitle data having the same content as the immediately preceding subtitle data. In 1Seg, characters and the like that are actually displayed in the subtitle text are encoded. The subtitle management data is control data such as what language the character data is, how many types of character data in a certain language are transmitted, how many types of character data in different languages are transmitted, Information such as language type and number of languages is encoded, and characters and the like that are actually displayed are not encoded.

  The image compression unit 122 compresses the video data out of the caption data and the video data sent from the video caption data acquisition unit 121, and stores the compressed image (compressed image) and the caption data in the video caption storage unit 123. As a compression algorithm, for example, one of the compression methods used in broadcast waves is H.264. H.264, JPEG compression, etc. are conceivable. Note that the image compression unit 122 is described so as to compress only video data, but compression processing may also be performed on caption data.

  The video subtitle storage unit 123 stores the compressed image sent from the image compression unit 122 and the subtitle data sent from the video subtitle data acquisition unit (or the image compression unit 122). Here, when data is stored, the compressed image and the caption data are stored separately, that is, without subtitle data being embedded in the image as in the prior art.

  The reproduction function unit 13 includes a history control unit 131 and an image decoding unit 132.

  When there is a history display request from the overall control unit 14, the history control unit 131 acquires subtitle data and a compressed image stored in the video subtitle storage unit 123, and sends them to the image decoding unit 132.

  The image decoding unit 132 decodes the compressed image out of the caption data and the compressed image sent from the history control unit 131, and sends the decoded video data and caption data to the screen synthesis unit 9. Note that H.264 is used for compressing video data by the image compression unit 122. If H.264 is used, the video decoder 7 can be used for decoding the data stored in the video subtitle storage unit 123, so that the image decoding unit 132 can be configured not to be used.

  The timer 11 is instructed by the video subtitle data acquisition unit 121 (the video subtitle data acquisition unit 121 causes the timer 11 to start counting when the viewer performs an operation for recording, for example, and then acquires the subtitle data. The count of time is reset and the count is started again), and when the predetermined time has elapsed, the video caption data acquisition unit 121 is notified. Here, the predetermined time is preferably about 10 seconds, which is the maximum transmission interval of the caption encoded data, but is not limited thereto. Note that the timer 11 resets the count and starts counting again after notifying the video caption data acquisition unit 121 when measuring a predetermined time.

  The key input unit 15 receives input from the viewer and sends the information to the overall control unit 14, and is, for example, a remote controller or a key of a mobile phone.

  The overall control unit 14 receives the input information from the key input unit 15 and sends the information to the tuner 3 if the information is “select channel X”. If the information is history display request information such as “view history”, “view previous history”, and “view next history”, the information is sent to the history control unit 131.

  The operation of the digital broadcast receiving apparatus configured as described above will be described with reference to FIG.

  First, after power-on, the antenna 2 receives a broadcast wave, the tuner 3 selects a desired channel, and demodulates the received signal of the selected channel (step S201). The channel to be selected here may be any channel, and may be the channel that was selected before the digital broadcast receiving apparatus was terminated last time or the channel with the lowest physical frequency.

  Thereafter, the DEMUX 4 separates the received data into audio encoded data, video encoded data, and subtitle encoded data, the audio encoded data to the audio decoder 5, the video data to the video decoder 7, and the subtitle encoded data to The data is sent to the caption decoder 8 (step S202).

  If there is audio encoded data that has not been decoded, the audio decoder 5 decodes the audio encoded data and acquires the audio display time and audio data. It is determined whether or not there is a voice display time that matches the current time among the acquired voice display times (step S203), and if it is determined that there is a voice display time that matches the current time, the voice decoder 5 displays the voice display time. Is output to the speaker 6, and the speaker 6 outputs the audio data (step S204), and the process proceeds to step S205.

  On the other hand, if it is determined in step S203 that the audio display time does not match the current time, if there is video encoded data that does not output audio and the video decoder 7 has not decoded, the video encoded data is decoded. Get video display time and video data. It is determined whether or not there is a video display time that matches the current time among the acquired video display times (step S205), and if it is determined that there is a video display time that matches the current time, the video decoder 7 displays the video display time. Is sent to the screen composition unit 9 and the video subtitle data acquisition unit 121, and the video subtitle data acquisition unit 121 temporarily stores the video data (step S206).

  On the other hand, if it is determined in step S205 that the video display time does not match the current time, the video data is not temporarily stored. If there is subtitle encoded data that has not been decoded, the subtitle decoder 8 decodes the subtitle encoded data, and acquires subtitle display time and subtitle data. It is determined whether or not there is a subtitle display time that matches the current time among the acquired subtitle display times (step S207). If it is determined that there is a subtitle display time that matches the current time, the subtitle decoder 8 displays the subtitle display time. Is sent to the screen composition unit 9 and the video subtitle data acquisition unit 121. The video subtitle data acquisition unit 121 sends the latest video data among the temporarily stored video data to the image compression unit 122, and the image compression unit 122 compresses the video data (step S208). The caption data here is composed of caption text (character data) and caption management data (control signal).

  Thereafter, the video subtitle storage unit 123 stores the compressed image data and the subtitle data (step S209), and the video subtitle data acquisition unit 121 operates the timer 11 (step S210). In addition, although it described that the process of step S210 which operates the timer 11 was performed after the process of step S209, the timer 11 was operated before the process of step S208, and you may make it perform the process of step S208 after that. .

  The video subtitle data acquisition unit 121 determines whether or not a predetermined time has elapsed since the timer 11 started timing (step S211), and when the timer 11 determines that the predetermined time has elapsed, the video subtitle data acquisition unit 121 However, the latest video data among the temporarily stored video data is sent to the image compression unit 122, the image compression unit 122 compresses the video data, and the video subtitle storage unit 123 stores the compressed image data and the subtitle data ( In step S212), the video caption data acquisition unit 121 sets the timer 11 (step S213). Note that when a predetermined time has elapsed since the timer 11 started timing, the video subtitle data acquisition unit 121 notifies the video subtitle data acquisition unit 121 that the predetermined time has elapsed. It is determined whether or not a predetermined time has elapsed based on the presence or absence of notification.

  On the other hand, if it is determined in step S211 that the timer 11 has not expired, that is, if there is no notification that the predetermined time has elapsed from the timer 11, the compressed image data and subtitle data are not stored, and the process proceeds to step S214.

  Subsequently, the history control unit 131 determines whether there is a history operation instruction from the overall control unit 14 (step S214). Here, when the viewer wants to discriminate the recording history, a history operation instruction is input using the key input unit 15 and sent to the overall control unit 14. When the overall control unit 14 receives a history operation instruction from the key input unit 15, it outputs a history operation instruction to the history control unit 131.

  If it is determined in step S214 that a history operation instruction has been received, the history control unit 131 reads out the compressed image and the caption data from the video subtitle storage unit 123 (step S215), and the image decoding unit 132 reads out the compressed image read out. Decoding is performed (step S216).

  The screen synthesizing unit 9 determines whether there is display data such as video data from the video decoder 7, subtitle data from the subtitle decoder 8, or image data and subtitle data from the image decoding unit 132 (step S217). If it is determined that there is, the screen composition unit 9 synthesizes the respective data sent and outputs them to the LCD 10 (step S218).

  FIG. 3 shows a display example by the digital broadcast receiving apparatus according to the first embodiment of the present invention. The digital broadcast receiving apparatus according to the first embodiment of the present invention is configured to record image data and caption data separately and synthesize the image data and caption data during image reproduction. As shown in FIG. 5, when the image size changes, the subtitles can be displayed in a suitable size regardless of the image size.

  Then, the overall control unit 14 determines whether there is an instruction to change the channel (step S219), and if it is determined that there is an instruction to change the channel, the process returns to step S201 to receive and demodulate the signal of the changed channel. Here, when it is desired to change the channel that the viewer is viewing, the channel input information of the channel to be viewed from now on is input using the key input unit 15 and output to the overall control unit 14. When the overall control unit 14 receives the channel designation information from the key input unit 15, it instructs the tuner 3 to select the channel designated by the viewer.

  On the other hand, if it is determined in step S219 that there has been no instruction to change the channel, the overall control unit 14 determines whether there has been a viewing end instruction from the key input unit 15 (step S220), and a viewing end instruction from the key input unit 15 If it is determined that there is no data, the process returns to step S202, and the received data is separated into audio encoded data, video encoded data, and caption encoded data.

  On the other hand, if it is determined in step S219 that there has been a channel change instruction, the process ends.

  If it is determined in step S217 that there is no display data, step S218 is not executed, and the process immediately proceeds to step S219 to determine whether a channel change instruction has been issued.

  According to the digital broadcast receiving apparatus of the first embodiment of the present invention, video data and subtitle data are stored separately, and when the video data and subtitle data are combined for playback, they are stored separately. By reading and synthesizing the video data and subtitle data, the subtitle text size and text layout can be easily changed during playback. Even if the output screen size changes, the history is displayed in a suitable size. can do. In addition, since the recorded video is compressed, the storage amount to be stored in the recording apparatus can be reduced. Furthermore, even when captions are not sent out for a long time, by recording video at a predetermined interval, the viewer can discriminate the recording history, and at the same time, the capacity of the storage device can be used most efficiently.

(Second Embodiment)
In this embodiment, when there are a plurality of images, they are displayed in a list in time series.
The configuration of the digital broadcast receiver 40 according to the second embodiment of the present invention is the same as that of the digital broadcast receiver 1 according to the first embodiment shown in FIG. A history control unit 431 is provided instead of the history control unit 131. In addition, the same code | symbol is attached | subjected to the component same as the digital broadcast receiver 1 shown in FIG. 1, and the description is abbreviate | omitted.

  When receiving an operation instruction for displaying a plurality of images from the key input unit 15, the overall control unit 44 outputs a history operation instruction to the history control unit 431.

  The history control unit 431 acquires subtitle data and compressed images stored in the video subtitle storage unit 123 in chronological order when there are a plurality of history display requests from the overall control unit 44, and sends them to the image decoding unit 132. .

  The operation of the digital broadcast receiving apparatus 40 configured as described above will be described with reference to FIG.

  Since the operations up to the storage of the video data and the caption data, that is, the procedures in steps S201 to S213 are the same as those in the first embodiment shown in FIG.

  After storing the video data and the caption data, the history control unit 431 determines whether there is a multiple image display instruction from the overall control unit 44 (step S501). Here, when it is desired to simultaneously display a plurality of images stored by the viewer, a multiple image display instruction is input using the key input unit 15 and sent to the overall control unit 44. When the overall control unit 44 receives a multiple image display instruction from the key input unit 15, it outputs a multiple image display instruction to the history control unit 431.

  If it is determined in step S501 that there has been an instruction to display multiple images, the history control unit 431 reads out the compressed image and the subtitle data from the video subtitle storage unit 123 in chronological order (step S502), and the image decoding unit 132 reads out. Each compressed image is decoded (step S503).

  The screen synthesizing unit 9 determines whether there is display data such as video data from the video decoder 7, subtitle data from the subtitle decoder 8, or image data and subtitle data from the image decoding unit 132 (step S504). If it is determined that there is, the screen composition unit 9 synthesizes the respective data sent, and outputs and displays them on the LCD 10 (step S505).

  FIG. 6 shows a display example by the digital broadcast receiving apparatus according to the second embodiment of the present invention. As shown in FIG. 6, a plurality of history videos and history subtitles are displayed in chronological order.

  On the other hand, if it is determined in step S504 that there is no display data, the process immediately proceeds to step S506.

  Subsequently, the history control unit 431 determines whether there is a scroll display instruction from the overall control unit 44 (step S506). Here, the viewer wants to scroll the display, inputs an up scroll or down scroll instruction using the key input unit 15, and sends it to the overall control unit 44. When the overall control unit 44 receives a scroll display instruction from the key input unit 15, it outputs a scroll display instruction to the history control unit 431.

  If it is determined in step S506 that a scroll display instruction has been issued, the previous compressed image and subtitle data or the next compressed image and subtitle are temporally transferred from the video subtitle storage unit 123 depending on whether the history control unit 431 is scrolling up or down. Each of the data is read out, the compressed image read out by the image decoding unit 132 is decoded, and the respective data sent by the screen combining unit 9 are combined, output to the LCD 10, and displayed (step S507).

  FIG. 7 shows a display example when scrolling. As shown in FIG. 7, when there is a scroll display instruction, the history is displayed by scrolling up or down according to the instruction.

  Subsequent operations, that is, the procedures in steps S219 to S220 are the same as those in the first embodiment shown in FIG.

  If it is determined in step S506 that there has been no scroll display instruction, the process immediately proceeds to step S219.

  According to the digital broadcast receiving apparatus of the second embodiment of the present invention as described above, when there are a plurality of images, they are displayed in a list in chronological order, and when there is a scroll display instruction from the viewer, the instruction is given. Accordingly, the viewer can discriminate a plurality of recording histories simultaneously by scrolling and displaying.

  In the above description, when the audio display time, the video display time, and the subtitle display time coincide with the current time, respectively, an example of performing audio output, temporary storage of video data, and compression of video data has been described. You may make it perform when each display time has passed the present time. As a result, since other processing has been performed, even when the current time has passed the display time, audio output, video data temporary storage, and video data compression can be performed.

  In the above description, the video subtitle data acquisition unit has explained the example of sending the subtitle data and the video data sent immediately before to the image compression unit, but the video subtitle data acquisition unit temporarily stores the subtitle data, You may make it send the video data sent immediately after that to the image compression part with the caption data. Since the data amount of video data is generally larger than the data amount of caption data, the amount of data to be stored by the video caption data acquisition unit can be thereby reduced.

  In the above description, the video subtitle data acquisition unit has described the example of sending the subtitle data and the video data sent immediately before to the image compression unit, but the video subtitle data acquisition unit receives the subtitle data sent from the subtitle decoder. Temporarily stores and stores the input video data and the input time of subtitle data, and compresses the video data with the smallest difference between the input time of the subtitle data and the input time of the video data for a given subtitle data You may make it send to a department. As a result, a more appropriate video can be associated with a certain subtitle.

  Further, in the above description, the example has been described in which the video subtitle data acquisition unit sends the latest video data to the image compression unit among the video data that is always temporarily stored when the subtitle data is transmitted from the subtitle decoder. The video subtitle data acquisition unit analyzes the subtitle data, and in the case of subtitle management data, neither the subtitle data nor the video data may be sent to the image compression unit. As a result, video is not recorded for subtitle data with no characters to be displayed, and the capacity of the storage device can be used most efficiently.

  Further, when storing in the video subtitle storage unit 123, an I picture or IDR picture (data encoded within one image) having the smallest difference from the subtitle data is stored, so that the image compression unit 122 is not used. Thus, the digital broadcast receiving apparatus of the present invention can be realized.

  In the above description, an example in which an LCD is used as a composite image output unit has been described. However, the present invention is not limited to this, and may be an organic EL, a CRC, or the like.

  As described above, the digital broadcast receiving apparatus according to the present invention can easily change the size and layout of subtitle characters during playback, and at the same time, can effectively use the capacity of the storage device. It is useful as a digital broadcast receiving apparatus that receives digital broadcasts in which video data and caption data are transmitted separately.

The figure which shows the structure of the digital broadcast receiver of the 1st Embodiment of this invention. The flowchart figure for operation | movement description of the digital broadcast receiver of the 1st Embodiment of this invention The figure which shows the example of a display of the 1st Embodiment of this invention The figure which shows the structure of the digital broadcast receiver of the 2nd Embodiment of this invention. The flowchart figure for operation | movement description of the digital broadcast receiver of the 2nd Embodiment of this invention The figure which shows the example of a display of the 2nd Embodiment of this invention. Figure showing a display example when scrolling It is a block diagram of the conventional digital broadcast receiver. Figure showing a conventional display example

Explanation of symbols

1, 40 Digital broadcast receiver 2 Antenna 3 Tuner 4 DEMUX
5 Audio Decoder 6 Speaker 7 Video Decoder 8 Subtitle Decoder 9 Screen Synthesizer 10 LCD
11 Timer 12 Recording Function Unit 13 Playback Function Unit 14, 44 Overall Control Unit 15 Key Input Unit 121 Video Subtitle Data Acquisition Unit 122 Image Compression Unit 123 Video Subtitle Storage Unit 131 431 History Control Unit 132 Image Decoding Unit

Claims (8)

A data separation unit for separating video data and caption data from a broadcast wave in which video data and caption data are multiplexed and compressed;
A video decoder for decoding the video data;
A subtitle decoder for decoding the subtitle data;
A video subtitle data storage unit for recording the video data decoded by the video decoder and the subtitle data decoded by the subtitle decoder;
A screen synthesis unit for generating an image obtained by synthesizing the video data and the subtitle data stored in the video subtitle data storage unit;
A display unit for outputting an image generated by the screen composition unit;
A digital broadcast receiving apparatus comprising: The digital broadcast receiver according to claim 1,
The video subtitle data storage unit refers to the first time information included in the video data and the second time information included in the subtitle data, and the video data and the subtitle data determined to be the same time , And record each
The screen synthesizing unit generates an image obtained by synthesizing the associated video data and the subtitle data among the video data and the subtitle data stored in the video subtitle data storage unit;
A digital broadcast receiver characterized by that. The digital broadcast receiver according to claim 1 or 2,
The video subtitle data storage unit includes a time point specified by the first time information included in the video data within a period including at least the time point specified by the second time information included in the subtitle data. A digital broadcast receiving apparatus, wherein the video data decoded by the video decoder and the subtitle data decoded by the subtitle decoder are recorded respectively. The digital broadcast receiver according to any one of claims 1 to 3,
The video subtitle data storage unit records only the video data decoded by the video decoder when character information is not included in the subtitle data. The digital broadcast receiver according to any one of claims 1 to 4,
Has a timer to measure time,
The timer starts measuring time when the current time coincides with the time point specified by the second time information included in the caption data,
The video subtitle data storage unit records the video data decoded by the video decoder and the subtitle data decoded by the subtitle decoder, respectively, when the time measurement by the timer exceeds a predetermined time.
A digital broadcast receiver characterized by that. The digital broadcast receiver according to any one of claims 1 to 4,
Has a timer to measure time,
The timer starts measuring time from the time when the caption data is received,
The video subtitle data storage unit records the video data decoded by the video decoder and the subtitle data decoded by the subtitle decoder, respectively, when the time measurement by the timer exceeds a predetermined time.
A digital broadcast receiver characterized by that. The digital broadcast receiver according to any one of claims 1 to 6,
A data compression unit for compressing data,
The data compression unit at least compresses the video data decoded by the video decoder;
The video subtitle data storage unit records the video data compressed by the data compression unit and the subtitle data compressed by the data compression unit or decoded by the subtitle decoder, respectively.
A digital broadcast receiver characterized by that. Separating video data and subtitle data from a broadcast wave in which video data and subtitle data are multiplexed and compressed;
Decoding the video data and the subtitle data;
Recording each of the decoded video data and the decoded subtitle data;
Generating an image obtained by combining the stored video data and the caption data;
Outputting the generated image; and
A digital broadcast receiving method comprising:

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