COSC 109 Lecture 4: Chapter 4
9 Mar 2017
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Document Summary
Sound: a wave that is generated by vibrating objects in a medium such as air: examples of vibrating objects: vocal cords of a person guitar strings tuning fork. Pitch of sound-sound frequency: higher frequency: higher pitch, the higher the wave length, human ear can hear sound ranging from 20 hz to 20,000 hz. The sound wave is sampled at a specific rate into discrete samples of amplitude values. When we sample into discrete samples we connect the dots going toward the one-second mark. The higher the hertz the higher the frequency. Higher sampling rate: the reconstructed wave looks closer to the original wave, more sample points, and thus larger file size. Count the horizontal lines for the whole graph to determine the number of bits: then - round each sample to the nearest level, then - reconstruct the waveform using the quantized samples. Effects of quantization: data with different original amplitudes may be quantized onto the same level.
