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Canon XL1 3CCD Camcorder User Manual

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•4:2:2‐Thisformatisusedforhigh‐endvideoauthoring

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•4:2:0‐Thevastmajorityofdeliverycodecsusethisformat.

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Thereisonechromasampleper2x2blockofpixels.Thischromasamplelooksnearlyasgoodas

4:4:4,butathalfthebitsperframe.

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•4:1:1‐NTSCDVandPALDVCPROusethisformat.

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Itcontainsthesamenumberofbitsperframeas4:2:0butwithonesampleper

4x1blockofpixels.

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betterforinterlacedcontentbecauseeachfieldgetsitsownsample;however,itcanresultinvisible

chromaartifactsinareasofhighsaturation

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•yUV‐9‐Thisformathasonechromasampleper4x4blockofpixels.

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resultsinnoticeablydegradedquality,soitisn’tusedinmoderncodecs.

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AudioCompression 

Themostfundamentalfactorinaudioissamplingrate,whichismeasuredinHertz(Hz),orcyclesper

second.AudioCDsuse44100Hz,or44.1kilohertz(KHz),whichprovidesexcellentreproduction.

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Thetablebelowshowsthetypicalsampleratesforcommonuse.

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S

AMPL

E

 USED

S

UFFICIENTFOR

8KHz Phonesystem

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Speech

11KHz Oldmultimediastandar

d

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BetterSpeech

22.050KHz Oldmultimediastandar

d

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Recognisablemusi

c

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