digaudio
TRANSCRIPT
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Introduction toIntroduction toDigital AudioDigital Audio
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ObjectivesObjectivesExplain the difference between analog and digital signals
Identify audio sampling standards
Describe audio sampling variables
Determine how variables affect file size and quality
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Analog vs. Digital Analog vs. Digital SignalsSignals
Analog –A continuously recorded sine wave signal usually recorded on a magnetic medium
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Analog vs. Digital Analog vs. Digital SignalsSignals
Digital –A signal that samples specified portions of a signal resulting in discrete digital information (i.e. bits of data)
“Sampled” discretedata
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Audio Sampling Audio Sampling VariablesVariables
Three main criteria:How many samples? OR “sampling rate”How much data per sample? OR “bit depth”How many channels sampled?
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How Many Samples?How Many Samples?Audio “Sampling Rates”Audio “Sampling Rates”
Digital VideoCD QualityStereoFM RadioAM RadioTelephone
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How Many Samples?How Many Samples?Audio “Sampling Rates”Audio “Sampling Rates”
Digital Video48,000 per sec
32,000 per sec
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How Many Samples?How Many Samples?Audio “Sampling Rates”Audio “Sampling Rates”
CD Quality 44,100 per sec
Left & Right
Channels Combined
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Other Sample RatesOther Sample RatesTypical Sample Rates:
Sample Rate
Less 8000
Quality
Telephone
11000 AM Radio
16000 FM Radio
22050 per Stereo
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How Much DataHow Much Dataper Sample?per Sample?
Common Sampling “Bit Depth”
8 bits of dataper sample16 bits of dataper sample
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How Many Channels How Many Channels Sampled?Sampled?
Number of ChannelsStereo (2 channels)
Mono (1 channel)
Multiple tracks
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Audio Sampling Audio Sampling VariablesVariables
File Size
Quality
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Audio Sampling VariablesAudio Sampling Variables
RecordSetting
s
SoundQuality
FileSize
Balance
Sample RateBit DepthNumber of Channels
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Audio Record RateAudio Record Rate
MoreAudio
Samples
LargerAudioFiles
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Audio File SizeAudio File Size
Bit Depth
Sample Rate
No of Channels
File size is determined bya combination of:
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Audio File SizeAudio File SizeFile size is determined bya combination of:
Bit Depth
Sample Rate
No of Channels
Length in MinutesLength in Minutes
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Audio File SizeAudio File Size
8 bit or 16 bit
Various Sample Rates
Stereo or Mono
Variables of concern:
Length in Minutes