Canon XL1 3CCD Manual

A SERVICE OF

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XL1AUDIOGUIDE 

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DigitalAudioRecording 

CANONDIGITALAUDIORECORDING

Canon’sXL1recordsinthe(relatively)newDVformat.Thisformatmakesforgreatlyexpandedaudio

capabilitiesbecauseofitsuseofPulseCodeModulation(PCM).

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thistypeofrecordingdiffersfromanaloguerecordingwheresoundwavesarerecordedaschanges

inthemagneticfieldonthetape.

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withdigitalaudiorecording,soundisrecordedasa0or1,whichisthenconvertedtoapulsecode.

[binaryvibe].

SOUNDWAVES

‐Soundwaves=vibrationsintheair;2properties:

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Thefrequencygoesfrombass(low)totreble(high)andreferstothenumberoftimespersecond

thewavegoesthroughacycle.Themorecyclespersecond,thehigherthefrequency

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Theamplitudegoesfromsofttoloudandreferstotheswingofthecurve.Thefurtherthecurve

swingsaboveorbelowthecentreline,thelouderthesignal.

[togetherfrequency+amplitudemakeupthesinewave]

‐Theaverageearprocesses20(20Hz)to20000cyclespersecond.

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thewavelengthbecomesshorterasthefrequencyrises

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HOWTHECAMERAPROCESSESDIGITALSOUND

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 

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analoguesignal

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A/DConverter

Sound

Camera

mi

c

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ThecamerapicksupananaloguesignalandusesanAnalogue‐to‐Digital(A/D)converter.

Forplayback,thesoundisprocessedthroughaDigital‐to‐Analogue(D/A)converter.

QUALITY

‐Digitalsystemsmeasureinsteps,buttheanaloguesignalsthey’remeasuringarecontinuous.