The Waveform time (ms) pressure • Microphone converts pressure to voltage • Plot pressure vs. time • Sound always has an oscillating pressure vs. time
The Waveform
Feb 11, 2016
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. - PowerPoint PPT Presentation
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Transcript
The Waveform
time (ms)
pres
sure
• Microphone converts pressure to voltage• Plot pressure vs. time• Sound always has an oscillating pressure vs. time
Compare Waveforms
period
T = 2.2 ms
T = 7 ms f = 1/T = 140 Hz
f = 1/T = 460 Hz
pure tone = sine wave
• Definite period single, constant frequency• Described by only two numbers: f, A
ampl
itude
period
How can we describe more complicated sounds?What creates a sine wave?
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