1_Introduction.pptx - Chapter 1 Introduction to Multimedia 1 Analog Information \u2022 Continuous information \u2022 An infinite number of divisions exist

1_Introduction.pptx - Chapter 1 Introduction to Multimedia...

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Chapter 1 Introduction to Multimedia 1
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Analog Information Continuous information An infinite number of divisions exist between any two measurements 2
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Analog vs. Digital Analog information continuous made up of infinite number of data points Digital data discrete 3
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Using More Decimal Places Pros : increase the precision in general (But how many is meaningful?) Will allow finer distinction between values (will explain in the next slide) Cons: Require more paper and paperwork. Take longer to read through and interpret the numbers. 4
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Digitization To convert analog information into digital data that computers can handle 2-step process: 1. sampling 2. quantization 5
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Sampling Analogous to weighing and recording the puppy's weight During the sampling step, you need to set a sampling rate. Sampling rate: how often you take a data 6
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Sampling Rate Weighing Puppy Scenario Digitization high (i.e. taking data often) Pros: can catch more weight changes Cons: produce more paperwork and thus take longer to read through all the data Pros: can capture details (e.g. some changes of color within a small region in a picture or amplitude changes in sound within a short period of time) Cons: produce larger file and thus take longer to process low (i.e. taking data infrequently) Pros: less paperwork and thus take shorter time to read through all the data Cons: may miss weight changes Pros: produce smaller file and thus take shorter time to process Cons: may miss details (e.g.
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  • ASCII, Digital audio, Audio compression

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