PhysicsChapter 4: Sound
Analyzing Sound Waves
Introduction
Sound waves can be analyzed using graphs and electronic instruments. A microphone converts sound vibration into an electrical signal. This signal can be displayed as a waveform.
Definition
Amplitude
Greater waveform amplitude generally represents greater sound intensity.
Frequency
Frequency can be determined by counting cycles per second or measuring the period. **f = 1T**
Period
The period is the time for one complete cycle.
Waveform Shape
Different sound sources can have different waveform shapes because of their different harmonic content. This contributes to differences in timbre.
Oscilloscope
An oscilloscope or digital waveform display allows us to observe: amplitude; period; * waveform shape.
Worked Example
If one cycle takes: T = 0.002 s then: f = 1T = 10.002 = **500 Hz**
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Review the key facts, formulas and checks before you move on.Analyzing Sound Waves
Sticky Notes · Quick Revision
AMPLITUDE
- Loudness-related
PERIOD
- Time/cycle
FREQUENCY
- 1T
WAVEFORM
- Timbre information