Basic Concepts
Multiprogramming is to have some process running at all times,to maximize CPU utilization.
Process execution consists of a cycle of CPU execution and I/O wait.
The figure shows the durations of CPU bursts.
Processes generally have a large number of short CPU bursts(I/O預處理) and small number of long CPU bursts.
An I/O-bound program typically has many short CPU bursts.(做io比較多的short cpu time比較多)
A CPU-bound program might have a few long CPU bursts(做cpu運算的long cpu time比較多)
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Unit 1 Digital Media Representation and Compression
Computers can only work with digital data
類比/數位 轉換 (A/D Conversion)
Analog-to-digital conversion requires two steps: Sampling (取樣) and Quantization (量化).
The number of samples taken per unit time or unit space is called the sampling rate(取樣率) or, alternatively, the resolution(解析度).
How to determine the sampling rate?
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