WO1998057496A1 - Decodeur et procede de decodage de signaux d'informations - Google Patents
Decodeur et procede de decodage de signaux d'informations Download PDFInfo
- Publication number
- WO1998057496A1 WO1998057496A1 PCT/JP1998/002600 JP9802600W WO9857496A1 WO 1998057496 A1 WO1998057496 A1 WO 1998057496A1 JP 9802600 W JP9802600 W JP 9802600W WO 9857496 A1 WO9857496 A1 WO 9857496A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- moving image
- image data
- decoding
- information signal
- decoded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/44016—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving splicing one content stream with another content stream, e.g. for substituting a video clip
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
- H04N21/43072—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen of multiple content streams on the same device
Definitions
- the present invention relates to an apparatus and a method for decoding image data and audio data, and more particularly to a special reproduction technique for image data.
- the decoder on the receiving side or the reproducing side uses the time stamp added to the bit stream to synchronize the decoding and display timing of the image signal and the audio signal. It is composed.
- the audio was muted because the timing could not be adjusted using the time stamp.
- the present invention has been made in view of such a problem, and an object of the present invention is to enable sound to be output even when an image is frozen in a decoder such as an MPEG. Another object of the present invention is to be able to return to output a moving image immediately after the freeze is released. It is another object of the present invention to synchronize the image and the sound immediately after the freeze is released.
- a plurality of areas for storing decoded moving image data are prepared, and freezing of the moving image data and the moving image thereof are performed using one of the plurality of areas. Continuous output of data, decoding of intra-frame prediction image and forward prediction image in the data stream of the moving image input during the freeze using other areas, and audio data stream For a single video, we decided to decode it while maintaining the synchronization with the video.
- a channel switching is prepared by decoding a data stream of a moving image of a channel different from the frozen moving image. Then, channel switching is selectively performed by selecting one of the moving image during the freeze and the moving image of the different channel.
- An information signal decoding device comprises: first decoding means for decoding a data stream of a moving image; second decoding means for decoding an audio data stream; Moving image data storage means having a plurality of areas for storing moving image data, and control means for synchronizing the decoding of the moving image data and the decoding of the audio data, wherein the moving image is stored using one of the plurality of areas. Freezes the data and continuously outputs the moving image data, and decodes the intra-frame predicted image and the forward predicted image in the data stream of the moving image input during the freeze using other areas. And decodes the audio data stream while maintaining synchronization with the moving image.
- the information signal decoding device comprises a switching means for switching and outputting the plurality of areas, and a selection means for selecting an area to be switched by the switching means, thereby selectively switching channels. It is characterized by the following.
- the information signal decoding method is characterized in that, when writing or reading in one of the plurality of regions, an intra-frame prediction image and a forward prediction in a data stream of a moving image using another region. Decodes the image and decodes it The moving image data is output as a reduced image to the one area.
- the information signal decoding device includes: decoding means for decoding a data stream of a moving image; moving image data storage means having a plurality of areas for storing decoded moving image data; Image reducing means for generating reduced image data from the decoded moving image data, wherein at the time of writing or reading in one of the plurality of regions, the other region is used for the data stream of the moving image.
- decoding of the intra-frame prediction image and the forward prediction image is performed, and the decoded moving image data is output as a reduced image to the one area.
- freezing of moving image data and continuous output of the moving image data are performed using one of the plurality of regions of the moving image storage means, and freezing is performed using the other region.
- the decoding of the intra-frame prediction image and the forward prediction image in the video data stream of the moving image input to is performed.
- the audio data stream is decoded while maintaining synchronization with the moving image.
- the intra-frame predicted image and the forward predicted image in the moving image data stream are used.
- the decoding is performed, and the decoded moving image data is output as a reduced image to the one area.
- FIG. 1 is a block diagram showing a configuration of a data decoding device to which the present invention is applied.
- FIG. 2 shows the internal area of the memory in FIG. 1c
- FIG. 3 is a block diagram showing a configuration of a decode controller and a timing generator in FIG.
- FIG. 4 is a diagram showing the flow of input / output image data of the video decoder during normal reproduction.
- FIG. 5 is a diagram showing an example of a timing relationship between input image data, image data stored in a memory, and output image data in a video decoder during normal reproduction.
- FIG. 6 is a diagram showing the flow of input / output image data of the video decoder when the image data is frozen.
- FIG. 7 is a diagram showing an example of a timing relationship between input image data in a video decoder, image data stored in a memory, and output image data when the image data is frozen.
- FIG. FIG. 4 is a diagram showing the flow of input / output image data of the video decoder when the channel of the image data is switched.
- FIG. 9 is a diagram illustrating an example of a timing relationship between input image data, image data stored in a memory, and output image data in a video decoder when a channel of image data is switched.
- FIG. 10 is a diagram showing the flow of input / output image data in the video decoder during strobe playback and [strobe playback + dropout playback].
- FIG. 11 is a diagram showing an example of a timing relationship between input image data in a video decoder and image data stored in a memory at the time of flash playback and [strobe playback + dropout playback].
- FIG. 1 is a block diagram showing a configuration of a data decoding device to which the present invention is applied.
- bit stream data is reproduction data from a recording medium such as a DVD or reception data from a digital broadcast tuner or the like.
- the channel decoding circuit 1 performs channel decoding of the bitstream data.
- the error correction and descrambling circuit 2 applies an error to the output data of the channel decoding circuit 1.
- the demultiplexer 3 separates a bit stream of one or more predetermined channels from output data of the error correction and descrambling circuit 2.
- the decode controller 4 controls decoding of the video decoder 6 and the audio decoder 7.
- the timing generator 5 generates a timing signal used by the decoded controller 4.
- the video decoder 6 uses the memory 8 to decode the image data from the bit stream of the image data.
- the audio decoder 7 uses the memory 9 to decode the audio data from the bit stream of the audio data.
- FIG. 2 shows an area inside the memory 8 in FIG.
- an input buffer area 8A and first to third output buffer areas 8B to 8D are provided.
- image data before decoding output from the decode controller 4 is stored.
- the first to third output buffer areas 8B to 8D store decoded image data, respectively.
- FIG. 3 is a block diagram showing a configuration of the decode controller 4 and the timing generator 5 in FIG.
- PES Packe-tized Elementary Stream; supplied from the demultiplexer 3
- PES Program Clock R eference
- SCR System Clock Reference
- the value of the PCR or SCR is different from the value of the STC counter 46 in the differentiator 51.
- the difference value is converted into an analog signal by the D / A converter 52, and controls the VC ⁇ (voltage controlled oscillator) 54 via the filter 53.
- the oscillation frequency of the VC054 is the same as that of the NTSC system. 29.
- the output of this VC ⁇ 54 is used as the reference clock of the STC counter 46.
- loading of PCR or SCR to the STC counter 46 is performed by PCR or SCR.
- CR is Deco Performed at the moment when the controller 4 is reached, the preset is completed when the last byte of PCR or SCR is loaded into the STC counter 46, and the count is incremented by the output clock of VCO 54 from the next moment.
- the PES bucket supplied via the input interface 41 is divided into a PES header part and a payload part by the PES parser 42. Then, the DTS (Decoding Time Samp) and PTS (Presentasion Time Stam) of the PES header part are extracted, and the DTS and PTS of the image data are stored in registers 4 3, respectively. — 1 and 4 3 ⁇ 2 are stored in the register, and the PTS of audio data is stored in register 4 3 ⁇ 3.
- the image data and the audio data, which are the payloads, are supplied to the video decoder 6 and the audio decoder 7, respectively.
- the DTS and PTS stored in registers 4 3-1 to 4 3-3 are independently compared with the value of the STC counter 46 by comparators 45-] to 45-3, respectively.
- the comparator 45-1 If the comparison result of the comparator 45-1 matches or falls within a certain range, the comparator 45-1 outputs a command to start decoding an I picture or a P picture of the image data. If the comparison result of comparator 45-2 matches or is within the range where there is a difference, a command to start display of I picture or P picture of image data or decoding of B picture is output. I do. If the comparison results of the comparators 45-5 match or the difference is within a certain range, a command for starting decoding of audio data is output.
- the image data is synchronized with the vertical synchronization period of the image signal inside the decode controller 4 and the GOP (Group of Picture) structure is used. Must be decoded or displayed in a predetermined order. Therefore, in FIG. 3, the value of the 3-counter 46 is latched in the register 47 at the timing of the vertical synchronization signal output from the synchronization signal generator 55. Then, the output of the register 49 and the output of the register 47 having a value equivalent to one frame unit in the unit of 90 kHz (3003 in the NTSC system and 36000 in the PAL system) are added. The time stamp is complemented by adding in the device 48.
- FIG. 4 shows the flow of input / output image data of the video decoder 6 during normal playback.
- the image data supplied from the demultiplexer 3 is stored in the input buffer area 8A of the memory 8. Then, after being read at the predetermined timing described with reference to FIG. 3 and decoded by the decoding unit 66, the first to third output buffer areas 8B to 8B of the memory 8 according to the type of picture Stored in 8D. Further, the data is read from these output buffer areas at a predetermined timing and output to the outside of the video decoder 6.
- FIG. 5 shows an example of a timing relationship between input image data in the video decoder 6 during normal reproduction, image data stored in the memory 8, and output image data.
- an input frame indicates a frame of image data input to the video decoder 6
- an output frame indicates a frame of image data output from the video decoder 6.
- Reference numerals 8B, 8C, and 8D denote image data frames stored in the first output buffer area 8B, the second output buffer area 8C, and the third output buffer area 8D, respectively.
- the first I picture (II) is input, decoded, and stored in the first output buffer area 8B.
- the first P picture (P 1) is input, decoded, and stored in the second output buffer area 8C.
- I 1 stored in the first output buffer area 8B is used.
- the first B picture (B 1) is input, decoded, and stored in the third output buffer area 8D.
- the second B picture (B 2) is input, decoded, and stored in the third output buffer area 8D.
- the data stored in the first to third output buffer areas are output in the order of II, B1, B2, P1, B3, B4, P2,.
- FIG. 6 shows the flow of input / output image data of the video decoder 6 when the image data is frozen.
- the image data supplied from the demultiplexer 3 is stored in the input buffer area 8A of the memory 8.
- the I picture is stored in the first output buffer area 8B
- the P picture is stored in the first output buffer area 8B or the second output buffer area.
- the B picture is not stored in the input buffer area 8A or is not decoded even if it is stored, it is not stored in the third output buffer area 8D.
- the image data stored in the first output buffer area 8B and the second output buffer area 8C is not output to the outside of the video decoder 6, and is not displayed on a monitor or the like. Then, the image data decoded before the freeze and stored in the third output buffer area 8D is repeatedly output. At this time, since the decoding and output of the audio data are continued, even if the image is frozen, the audio is played back as in normal playback. As soon as the freeze is released, decoding of the image data starts. Even during a freeze, the decoded I-picture and P-picture are stored in the first output buffer area 8B and the second output buffer area 8C. Output can be performed.
- FIG. 7 shows an example of the timing relationship between the input image data in the video decoder 6, the image data stored in the memory 8, and the output image data when the image data is frozen.
- the operation until the freeze command is given from the user and the operation after the freeze is released are the same as those in the normal reproduction shown in FIG.
- the image data (here, B 2) stored in the third output buffer area 8D is repeatedly output.
- the input I picture and P picture are sequentially decoded and stored alternately in the first output buffer area 8B and the second output buffer area 8C.
- the freeze is released when B12 is input, the data stored in the first output buffer area 8B and the second output buffer area 8C are stored.
- B12 is decoded using P4 and P5, and stored in the third output buffer area 8D.
- the first output buffer 8 B or the second output buffer area 8 C Yo also be freeze-les, c that is, B 1 are input
- the first output buffer 8B is frozen when a freeze command is given while the picture is frozen
- the I picture is frozen and the second and third output buffers 8C and 8B are frozen.
- Decoding of I and P pictures is performed using D.
- the freeze command is given while B1 is being input, and if the second output buffer 8C is frozen, the P picture will be frozen, and the first and second pictures will be frozen. Decode I and P pictures using output buffers 8 B and 8 D
- FIG. 8 shows the flow of input / output image data of the video decoder 6 when the channel of the image data is switched.
- the image data input to the video decoder 6 is switched by a user's command.
- C This switching is performed by the demultiplexer 3, for example.
- the image data supplied from the demultiplexer 3 is stored in the input buffer area 8A of the memory 8.
- the I picture is stored in the first output buffer area 8B
- the P picture is stored in the first output buffer area 8B or the second output buffer area 8B.
- the B picture is not stored in the input buffer area 8A or is not decoded when stored, it is not stored in the third output buffer area 8D.
- the image data decoded before the channel switching and stored in the third output buffer area 8D is repeatedly output. By switching the switches 67, the image data stored in the third output buffer area 8D before the channel switching is output from the video decoder 6, or the first output buffer area 8B and the second 2 It is possible to select whether to output the image data stored in the output buffer area 8C from the video decoder 6.
- Figure 9 shows the video decoder 6 when the image data channel is switched.
- An example of the timing relationship between input image data, image data stored in the memory 8, and output image data is shown.
- channel 1 is switched to channel 2.
- the number after the “1” after the picture number indicates the channel number.
- the operation before channel switching is the same as the operation during normal playback shown in FIG.
- the I picture and P picture of channel 2 are sequentially decoded and stored alternately in the first output buffer area 8B and the second output buffer area 8C. Then, it is output from the video decoder 6 through the switch 67.
- FIG. 10 shows the flow of input / output image data in the video decoder 6 at the time of strike-out playback and at the time of [strike-out playback + dropout playback].
- image data supplied from the demultiplexer 3 is stored in an input buffer area 8A of the memory 8.
- the I picture is stored in the first output buffer area 8B
- the P picture is stored in the first output buffer area 8B or the second output buffer area 8B.
- the B picture is not stored in the input buffer area 8A or, if stored, is not decoded, and thus is not stored in the third output buffer area 8D.
- the image data stored in the first output buffer area 8B and the image data stored in the second output buffer area 8C are read out at a predetermined timing, and are subjected to size reduction processing by the filter 68. Is written to the third output buffer area 8D. Then, it is read out at a predetermined timing and output from the video decoder 6.
- FIG. 11 is a diagram showing an example of the timing relationship between the input image data in the video decoder 6 and the image data stored in the memory 8 at the time of strobe playback and [strobe playback + dropout playback].
- the first I picture (II) is input, decoded, and stored in the first output buffer area 8B. Then, it is read from here, reduced to a size of 1 74 by the filter 68, and is left of the third output buffer area 8D. Stored at the top. Then, it is read from here at a predetermined timing and output from the video decoder 6.
- the first P picture (P 1) is input, decoded, and stored in the second output buffer area 8C. Then, the size is reduced to 1Z4 by the filter 68 and stored in the upper right part of the third output buffer area 8D.
- the image data stored in the upper left part and the image data stored in the upper right part in the third output buffer area 8D are read out therefrom at a predetermined timing, and output from the video decoder 6.
- a first B-picture to be next input (B 1) because the second B picture to be inputted next (B 2) is not decoded, the contents of the memory 8 is changed Shinare, and c its Then, the second P picture (P 2) input next is decoded and stored in the first output buffer area 8B.
- the monitor screen connected to the output of the video decoder 6 corresponds to the change in the picture stored in the third output buffer area.
- the strobe image is displayed.
- B5 and B6 are not decoded, the contents of memory 8 remain unchanged.
- I2 input next to B6 is decoded, reduced to the size of 1Z4 by the filter 68, and stored in the lower right of the third output buffer area.
- the next two frames (B 7 and B 8) input next are not decoded, and the P 4 input next to B 8 is decoded and reduced to 1/4 size by the filter 68 before 3 Stored in the lower right of the output buffer area.
- the monitor screen connected to the output of the video decoder 6 corresponds to the change in the picture stored in the third output buffer area.
- Strobe playback + re-drop Raw The image is displayed.
- the lower right image of the screen is updated with the I picture and P picture, and the remaining 3/4 of the screen becomes a fixed image.
- the screen is divided into four, but the number of divisions is not limited to this.
- the position of the frame drop image is not limited to the lower right of the screen.
- the present invention can be applied to a digital satellite broadcasting transceiver that receives a broadcast program encoded using MPEG and reproduces the broadcast program with special effects such as still picture, strobe playback, and channel scan.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Television Signal Processing For Recording (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/242,117 US6636563B2 (en) | 1997-06-12 | 1997-06-12 | Decoder and decoding method for information signal |
| EP98924598A EP0918437A4 (en) | 1997-06-12 | 1998-06-12 | DECODING DEVICE AND DECODING METHOD FOR INFORMATION SIGNALS |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15465597A JPH114446A (ja) | 1997-06-12 | 1997-06-12 | 情報信号デコード方法及び装置 |
| JP9/154655 | 1997-06-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998057496A1 true WO1998057496A1 (fr) | 1998-12-17 |
Family
ID=15588994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1998/002600 Ceased WO1998057496A1 (fr) | 1997-06-12 | 1998-06-12 | Decodeur et procede de decodage de signaux d'informations |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6636563B2 (ja) |
| EP (1) | EP0918437A4 (ja) |
| JP (1) | JPH114446A (ja) |
| KR (1) | KR100629097B1 (ja) |
| WO (1) | WO1998057496A1 (ja) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001231035A (ja) * | 2000-02-14 | 2001-08-24 | Nec Corp | 復号同期制御装置、復号装置、及び復号同期制御方法 |
| JP3691365B2 (ja) * | 2000-08-23 | 2005-09-07 | 三洋電機株式会社 | ディジタル放送受信装置 |
| US7120168B2 (en) * | 2001-11-20 | 2006-10-10 | Sony Corporation | System and method for effectively performing an audio/video synchronization procedure |
| KR20040024455A (ko) * | 2002-09-13 | 2004-03-20 | 톰슨 라이센싱 소시에떼 아노님 | 오디오/비디오 디지털 디코더를 제어하는 방법 |
| JP4055631B2 (ja) * | 2003-04-10 | 2008-03-05 | ソニー株式会社 | 記録再生装置及び記録媒体のアクセス方法 |
| JP4095559B2 (ja) * | 2004-02-13 | 2008-06-04 | 株式会社東芝 | H.264コーデックic、dvd再生装置、h.264コーデック方法 |
| US20060198518A1 (en) * | 2004-04-07 | 2006-09-07 | Sony Corporation | Information processing device and information processing method |
| US20050286639A1 (en) * | 2004-06-23 | 2005-12-29 | Broadcom Corporation | Pause and freeze for digital video streams |
| TWI294085B (en) * | 2005-07-12 | 2008-03-01 | Realtek Semiconductor Corp | Method and apparatus for synchronizing multimedia data stream |
| KR101143907B1 (ko) * | 2007-02-15 | 2012-05-10 | 삼성전자주식회사 | 디지털 방송 재생 방법 및 장치 |
| JP4703733B2 (ja) * | 2009-01-14 | 2011-06-15 | 株式会社東芝 | 映像・音声再生装置 |
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| JPH08205147A (ja) * | 1995-01-26 | 1996-08-09 | Graphics Commun Lab:Kk | 画像復号化方法及び画像復号化装置 |
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| JPS6460155A (en) * | 1987-08-31 | 1989-03-07 | Canon Kk | Image processor |
| US5317399A (en) | 1990-05-09 | 1994-05-31 | Canon Kabushiki Kaisha | Image reproducing apparatus capable of freezing a displayed image |
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1997
- 1997-06-12 US US09/242,117 patent/US6636563B2/en not_active Expired - Fee Related
- 1997-06-12 JP JP15465597A patent/JPH114446A/ja active Pending
-
1998
- 1998-06-12 EP EP98924598A patent/EP0918437A4/en not_active Withdrawn
- 1998-06-12 WO PCT/JP1998/002600 patent/WO1998057496A1/ja not_active Ceased
- 1998-06-12 KR KR1019997001148A patent/KR100629097B1/ko not_active Expired - Fee Related
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| JPH0458685A (ja) * | 1990-06-28 | 1992-02-25 | Nec Home Electron Ltd | 圧縮動画像の多画面静止画再生方法 |
| JPH08102939A (ja) * | 1994-09-29 | 1996-04-16 | Sanyo Electric Co Ltd | 圧縮動画像復号装置 |
| JPH08205147A (ja) * | 1995-01-26 | 1996-08-09 | Graphics Commun Lab:Kk | 画像復号化方法及び画像復号化装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0918437A1 (en) | 1999-05-26 |
| KR20000068121A (ko) | 2000-11-25 |
| JPH114446A (ja) | 1999-01-06 |
| US20030095600A1 (en) | 2003-05-22 |
| EP0918437A4 (en) | 2000-05-10 |
| KR100629097B1 (ko) | 2006-09-28 |
| US6636563B2 (en) | 2003-10-21 |
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