JP4875832B2 - 転送装置、プログラム及びコンピュータ読み取り可能な記憶媒体 - Google Patents
転送装置、プログラム及びコンピュータ読み取り可能な記憶媒体 Download PDFInfo
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- JP4875832B2 JP4875832B2 JP2004026142A JP2004026142A JP4875832B2 JP 4875832 B2 JP4875832 B2 JP 4875832B2 JP 2004026142 A JP2004026142 A JP 2004026142A JP 2004026142 A JP2004026142 A JP 2004026142A JP 4875832 B2 JP4875832 B2 JP 4875832B2
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- Prior art keywords
- pcr
- packet
- transport stream
- transfer
- time interval
- 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.)
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- 230000005540 biological transmission Effects 0.000 claims description 38
- 238000001514 detection method Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000000872 buffer Substances 0.000 description 23
- 230000006870 function Effects 0.000 description 12
- 238000004891 communication Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 238000011094 buffer selection Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003752 polymerase chain reaction Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000012556 adjustment buffer Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
-
- 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
- H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
-
- 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
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43632—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wired protocol, e.g. IEEE 1394
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
- H04N5/77—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
- H04N5/77—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera
- H04N5/772—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera the recording apparatus and the television camera being placed in the same enclosure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
- H04N5/775—Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
- H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Information Transfer Systems (AREA)
- Time-Division Multiplex Systems (AREA)
- Communication Control (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Description
PCR(i)=PCR_base(i) * 300 + PCR_ext(i) ----------------------------(1)
ここで、PCR_base(i)はPCR内のProgram_clock_reference_base (33 bits)であり、PCR_ext(i)はPCR内のProgram_clock_reference_extension (6bits)である。
Intvl_PCR(i) = PCR(i+1) - PCR(i) ---------------------------------(2)
Smoothed_Intvl_PCR(i) = Intvl_PCR(i) - MOD(Intvl_PCR(i), 3375) ---(3)
ここで、3375は、125μsを27MHzクロックに換算した値である。また、MOD()は剰余を計算する関数である。
CarriedError += MOD(Intvl_PCR(i), 3375) --------------------------(4)
New_PCR(i+1) = PCR(i) + Smoothed_Intvl_PCR(i) --------------------(5)
ここで、PCR(i)とNew_PCR(i+1)との間の時間間隔は、125μsの整数倍となる。
CarriedError >= 3375 ---------------------------------------------(6)
New_PCR(i+1) = New_PCR(i+1) + 3375 -----------------------------(7-1)
CarriedError -= 3375 -------------------------------------------(7-2)
Num_MicroFrm(i) = (New_PCR(i+1) - PCR(i)) / 3375 -----------------(8)
TransPktA(i) = (INT)(Num_TS_PACKET(i) / Num_MicroFrm(i)) -------(9-1)
TransPktB(i) = TransPktA(i) + 1 --------------------------------(9-2)
NumOfTranspktB(i) = MOD(Num_TS_PACKET(i), Num_MicroFrm(i)) -----(9-3)
NumOfTranspktA(i) = Num_MicroFrm(i) - NumOfTranspktB(i) --------(9-4)
ここで、TransPktA(i)及びTransPktB(i)は、PCR(i)を含むTSパケットからPCR(i+1)を含むTSパケットまでの間に各USBマイクロフレームにおいて送信されるTSパケットの数である。
502 USBケーブル
503 PC
601 ストレージ部
602 読み出し部
604a〜604c バッファ
603、605 バッファ選択部
606 USBインターフェース部
607 PCR検出部
608 PCR間隔計算部
609 PCR再計算部
610 送信タイミング計算部
701 CPU
702 MPEG2TSコーデック
703 USBインターフェース部
704 データバス
Claims (6)
- MPEG−2トランスポートストリームに含まれる第1のトランスポートストリームパケットから第1の時間調整情報を検出し、前記MPEG−2トランスポートストリームに含まれる第2のトランスポートストリームパケットから第2の時間調整情報を検出する検出手段と、
前記第1の時間調整情報と前記第2の時間調整情報との間の時間間隔を計算する計算手段と、
前記時間間隔がアイソクロナス転送の1サイクルの整数倍になるように再計算することにより、前記時間間隔を再計算済み時間間隔に変換する変換手段と、
前記第1のトランスポートストリームパケットと前記第2のトランスポートストリームパケットとの間の複数のトランスポートストリームパケットの送信タイミングを、前記第1のトランスポートストリームパケットから前記第2のトランスポートストリームパケットの一つ前のトランスポートストリームパケットまでにおけるトランスポートストリームパケットの数と、前記再計算済み時間間隔とを用いて計算する送信タイミング計算手段と、
前記複数のトランスポートストリームパケットを、前記送信タイミング計算手段によって計算された送信タイミングに従って転送する転送手段と
を有することを特徴とする転送装置。 - 前記第1の時間調整情報及び前記第2の時間調整情報はいずれも、プログラム・クロック・リファレンス(Program Clock Reference)であることを特徴とする請求項1に記載の転送装置。
- 前記転送手段は、ユニバーサル・シリアル・バス(Universal Serial Bus)に準拠した転送手段であることを特徴とする請求項1または2に記載の転送装置。
- 前記アイソクロナス転送の1サイクルは、125μ秒であることを特徴とする請求項1から3のいずれか1項に記載の転送装置。
- コンピュータを請求項1から4のいずれか1項に記載の転送装置として機能させるためのプログラム。
- 請求項5に記載のプログラムを記憶したコンピュータ読み取り可能な記憶媒体。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004026142A JP4875832B2 (ja) | 2004-02-02 | 2004-02-02 | 転送装置、プログラム及びコンピュータ読み取り可能な記憶媒体 |
US11/044,148 US7440400B2 (en) | 2004-02-02 | 2005-01-27 | Transfer apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004026142A JP4875832B2 (ja) | 2004-02-02 | 2004-02-02 | 転送装置、プログラム及びコンピュータ読み取り可能な記憶媒体 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005216265A JP2005216265A (ja) | 2005-08-11 |
JP4875832B2 true JP4875832B2 (ja) | 2012-02-15 |
Family
ID=34835834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004026142A Expired - Fee Related JP4875832B2 (ja) | 2004-02-02 | 2004-02-02 | 転送装置、プログラム及びコンピュータ読み取り可能な記憶媒体 |
Country Status (2)
Country | Link |
---|---|
US (1) | US7440400B2 (ja) |
JP (1) | JP4875832B2 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090263104A1 (en) * | 2005-10-07 | 2009-10-22 | Koichi Tsutsumi | Stream playback control device |
JP2007150845A (ja) * | 2005-11-29 | 2007-06-14 | Samsung Electronics Co Ltd | データ再生装置,データ再生方法およびそのプログラム |
US7548543B2 (en) * | 2006-05-19 | 2009-06-16 | Scientific-Atlanta, Inc. | Generation of valid program clock reference time stamps for duplicate transport stream packets |
US7734976B2 (en) * | 2006-11-30 | 2010-06-08 | Electro Scientific Industries, Inc. | Synchronizing control of test instruments |
WO2008110986A2 (en) * | 2007-03-14 | 2008-09-18 | Nxp B.V. | Method for transmitting a data stream comprising a plurality of data packets from a source via a usb link to a sink |
US8473707B2 (en) * | 2008-03-27 | 2013-06-25 | Open Invention Network, Llc | Method for achieving sequential I/O performance from a random workload |
JP2013156674A (ja) * | 2012-01-26 | 2013-08-15 | Kayaba Ind Co Ltd | ドライブレコーダ |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001282713A (ja) | 2000-03-29 | 2001-10-12 | Matsushita Electric Ind Co Ltd | 送信装置、ieee1394受信記録装置、媒体及び情報集合体 |
CN1788473B (zh) * | 2003-05-16 | 2012-02-15 | 松下电器产业株式会社 | 用于通信网络系统中的通信终端设备,方法和集成电路 |
-
2004
- 2004-02-02 JP JP2004026142A patent/JP4875832B2/ja not_active Expired - Fee Related
-
2005
- 2005-01-27 US US11/044,148 patent/US7440400B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US20050180732A1 (en) | 2005-08-18 |
JP2005216265A (ja) | 2005-08-11 |
US7440400B2 (en) | 2008-10-21 |
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