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The Waveform

pressure. time (ms). The Waveform. Microphone converts pressure to voltage Plot pressure vs. time Sound always has an oscillating pressure vs. time. period. T = 2.2 ms. T = 7 ms. Compare Waveforms. f = 1/T = 460 Hz. f = 1/T = 140 Hz. period. amplitude. pure tone = sine wave.

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The Waveform

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  1. pressure time (ms) The Waveform • Microphone converts pressure to voltage • Plot pressure vs. time • Sound always has an oscillating pressure vs. time

  2. period T = 2.2 ms T = 7 ms Compare Waveforms f = 1/T = 460 Hz f = 1/T = 140 Hz

  3. period amplitude pure tone = sine wave • Definite period single, constant frequency • Described by only two numbers: f, A What creates a sine wave? How can we describe more complicated sounds?

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