DVD與CD差異.ppt

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1、DVD與CD之差異性Hunter碟片剖面圖穿透層記錄層保護(hù)層標(biāo)籤層CDDVDSLDL黏著層記錄層記錄層黏著層穿透層穿透層記錄層間隔層55?m碟片資料讀取DVD碟片逆時(shí)鐘方向旋轉(zhuǎn)(讀取頭)SL&DLPTPmode由內(nèi)向外DLOTPmode-LayerJumpLayer0?由內(nèi)向外Layer1?由外向內(nèi)CD碟片逆時(shí)鐘方向旋轉(zhuǎn)(讀取頭)Always由內(nèi)向外機(jī)械性質(zhì)(I)碟片重量DVD12cm?13~20g8cm?6~9gCD12cm?14~33gclampingForceDVD?2?0.5NCD?1~2N機(jī)械性質(zhì)(II)碟片轉(zhuǎn)動(dòng)慣量DVD12cm?0.04gm2max.8

2、cm?0.01gm2max.碟片dynamicimbalanceDVD12cm?0.01gmmax.8cm?0.0045gmmax.機(jī)械性質(zhì)(III)Scanning速度DVDSL?3.49m/sDL?3.84m/sCD1.2m/s~1.4m/s機(jī)械性質(zhì)(IV)CD碟片DVD碟片3.84m/s3.49m/s1.4m/s1.2m/s內(nèi)圈(rpm)外圈(rpm)19845923153557513891528633?NormalSpeed尺寸規(guī)格(I)Clamping區(qū)域DVD?22mm(max.)~33mm(min.)CD?26mm(max.)~33mm(min.)Le

3、ad-in區(qū)DVD?45.2mm(max.)~48mmCD?46mm(max.)~50mmData區(qū)DVD?48mm~116mm(max.)CD?50mm~116mm(max.)尺寸規(guī)格(II)Lead-out區(qū)DVDData區(qū)?115mm?2mm(min.)115mm

4、m)0.40.440.8330.972PitWidth(?m)0.380.6PitDepth(?m)0.10.12誤差規(guī)格(I)軸向(verticaldeviation)DVD12cm??0.3mm加速度?8m/s2max.允許誤差??0.23?mCD12cm??0.5mm加速度?10m/s2max.允許誤差??1?m誤差規(guī)格(II)徑向(radialdeviation)DVDrunout??0.05mm加速度?1.1m/s2max.允許誤差??0.022?mCDrunout??0.07mm加速度?0.4m/s2max.允許誤差??0.03?m光學(xué)特性CD碟片DVD

5、碟片雷射波長(zhǎng)(nm)780650/635數(shù)值孔徑(NA)0.61.32?0.9?1.922.110.45光點(diǎn)大小(?m)聚焦深度(?m)反射率(%)70min.SLDL45~8518~30SubstrateRI1.55資料編碼流程(I)ForDVDIDdata(4)ID+IEDAddIED(6)(ID+IED)+CPR_MAI+MaindataAddCPR_MAI&MainData(2060)DataFramebeforeScramblingAddEDC(2064)ScrambledFramescramblemaindata16ScrambledFrameECCen

6、coding16RecordingFrameInterleave16rowsofPO(2366)PhysicalSectorModulate26syncframespersector(2418)38688bits資料編碼流程(II)ForCD-ROMMode1Header(4)Header+Maindata+ZeroMainDataZero(2060)DataSectorbeforeScramblingAddEDCECCScrambledFrameScrambledataScrambledFrameECCencodingRecordingFramePhysicalF

7、rameAddSync(24)MergingBits588bits(2340)AddSync(2352)(24)AddSub-Code(33)Modulate資料傳輸與訊號(hào)特性CD碟片DVD碟片4.321826.1611.08436017.587.357201.4112RawDataRate(Mb/s)UserDataRate(Mb/s)3T訊號(hào)頻率(kHz)同步訊號(hào)頻率(kHz)資料規(guī)格(I)CD碟片DVD碟片EFMEFM+EDC+ECC+CIRCNo17.587.35YesIED+EDC+RS-PC資料調(diào)變方式錯(cuò)誤訂正碼MergingBits同步訊號(hào)頻率(k