1. Measuring Sound
1.1. Sound as Waveform
1.1.1. Sinusoidal Waveforms
1.1.1.1. Measurements made
1.1.1.1.1. Period
1.1.1.1.2. Frequency
1.1.1.1.3. Wavelength
1.1.1.1.4. Amplitude
1.1.2. Periodic Complex Waveforms
1.1.2.1. Measurements made
1.1.2.1.1. Period
1.1.2.1.2. Wavelength
1.1.2.1.3. Fundamental Frequency (fo)
1.1.2.1.4. Harmonics
1.1.3. Aperiodic Complex Waveforms
1.1.3.1. Measurements made
1.1.3.1.1. Component Frequencies
1.2. Measuring Signal Strength
1.2.1. Sound Power
1.2.1.1. watts/unit time
1.2.2. Sound Intensity
1.2.2.1. watts/m2 or watts/cm2
1.2.3. Sound Pressure
1.2.3.1. micropascal
1.3. Scaling Signal Strength
1.3.1. The Decibel
1.3.1.1. Intensity Level (IL)
1.3.1.1.1. Reference: 10^-12 watt/m2 or 10^-16 watt/cm2
1.3.1.2. Sound Pressure Level (SPL)
1.3.1.2.1. Reference: 20 micropascal
2. What is sound?
2.1. Audible disturbance in a medium produced by a vibrating source
2.1.1. Simple Harmonic Motion
2.1.1.1. Pure Tones
2.1.1.1.1. Elements of Pure Tones
2.1.2. Complex Sound
2.1.2.1. Periodic Complex Sound
2.1.2.1.1. Identifiable cycle
2.1.2.2. Aperiodic Complex Sound
2.1.2.2.1. NO identifiable cycle
2.1.3. Elements of Sound
2.1.3.1. Source of Energy
2.1.3.1.1. i.e. Breath
2.1.3.2. Vibrating Source
2.1.3.2.1. i.e. Vocal Folds
2.1.3.3. Medium
2.1.3.3.1. i.e. Air particles, H2o
2.1.3.4. Response to Sound
2.1.3.4.1. i.e. Response in brain