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DigitalMedia
 Digitalmedia
 Pictures,sound,videoandanimationstored/processedincomputers
indigitalformat(i.e.,binarynumbers)
 Typicalhardwarerequirements workwithdigitalmedia



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Apowerfulmicroprocessor
Largememoryandstoragecapacity
Ahigh‐qualitymonitorandadisplaycard
Mayalsoneedsomeinputdevices
Amicrophoneormusicalkeyboardforaudioinput
Adigitalcameraorscannerforgraphicsinput
Ananalogvideocameraforvideoinputandavideocapturecardto
convertanalogvideotodigitalvideo
Oradigitalvideocamera
JeanWang/CS1102‐ Lec07
4
Analog to Digital
EI
to convert analogsignals to digital signals
*Sampling - to slicetàe analog
into small segments
regularþ at uniform intervals
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*Quantization - the height
(amplitude) of eadr sample is
converted into a binary number
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*Sampling rate - the number of
times per second tùat a sound is
measured during the converting
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4
DigitalAudioBasics
 Audioisoriginallyananalog waveformsignal,anditmustbe
convertedintodiscretedigital signalinordertobestoredinand
processedbycomputers
Analog (waveform)datasignal
Digital(discrete)datasignal
 Exampleconvertingdevices
 Analog‐>digital:soundcards,display/videocards,scanners,
digitalcameras,videocapturecards
 Digital‐>analog:soundcards,VGAdisplaycard
JeanWang/CS1102‐ Lec07
6
DigitalAudioBasics(cont'd)
JeanWang/CS1102‐ Lec07
7
Sound QualiW
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For voice/speech signal, a smaller sampling rate is good eno"gh (e.g. U,000Hz)
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Numberofchannels
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left surround, right surround
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Data compression (or encoding) is the technique of reducing the
number of binary digits required to represent data
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audio/video co dec (coder/ decoder)
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