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Canon XL1 3CCD Camcorder User Manual

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Ananaloguesystemhasaninfiniterangeofvalueswhichitcanrecord

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Digitalsystemscanrecordonlyafinitenumberofthosevalues

Thismeansthatdigitalsystemshavesomeinevitablemismatchintherecording,andeverysuch

mismatchaddsnoiseanddistortiontothesignal.

‐Digitalsystemsusebinarycode–1’sand0’s.

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eachdigitaddeddoublesthenumberofpossiblevalues(i.e.a1digitnumberhas2values,a2digit

has4,a3digithas8,etc.)

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eachtimeadigitisaddedtheamountofinaccuracyiscutinhalf

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1digitreducesnoiseanddistortionby6dB(thedigitismultipliedbysixtogetthedB)

Sowhateverthebitsystemis,multiplyby6togetitsrange.

e.g.aCD=16bitsoit’s96dB

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DIGITALFEATURES

‐Copyingasignaldegradesit,butnotindigitalreproduction

‐Digitalhasnowoworflutter,becausethebuffercircuitsmoothsoutspeedvariations.

‐A/Dconverter

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inthisconversionprocessthequalityisaffectedby2variables:

1.Samplerate–thehigherthesampleratethebetter;thisgivesyouthathi‐fisound

2.Bitdepth‐themorebitsthemoreaccuratethemeasurement

3DigitalaudiomodesontheXL1 

1.16‐bitStereo(48kHz,2channel)

‐highestsoundquality

‐16bit=theamountofdatarecordedandtherange

‐Needasamplingrateof48kHz,44.1kHzor32kHz

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2.12‐bitStereo(32kHz,2channels)

‐Recordson2ofthe4channels

‐Leavesstereo2availableforadditionalsound(music,narration,etc)–post‐prodsound

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