Unformatted text preview: 5/Sampling_and_Aliasing.swf To represent digitally, decide on: Sampling rate –how often to read the amplitude of the wave Quantization –how many bits used to represent the amplitude These two values are analogous to resolution and color depth for images… Sampling
Sampling sampling rates vs. quality of sound intensity of compression wave (e.g., as measured by voltage from microphone) time < sampling rate > slow rate misses peaks, valleys Sampling examples
Sampling examples Not a very good approximation of the original sound curve Sampling examples
Sampling examples A better approximation of the original sound curve
How much sampling is enough? http://en.wikipedia.org/wiki/Sampling_theorem
Flash tutorial Quantization
Quantization quantization quantization vs. quality of sound Number of distinct amplitudes we choose to represent.
Fewer values available creates large rounding errors Quantization examples
1 0 Number of distinct amplitu...
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- Fall '09
- Computer Science, Color depth