Acoustics and Psychoacoustics - Chapter 2
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27 terms
Terms | Definitions |
|---|---|
 Sinusoidal motion | Amplitude and wavelength |
| Amplitude | Maximum distance that a point is displaced from its normal resting position (maximum displacement) |
| Wave peak | Highest point of a wave |
| Wave trough | Lowest point of a wave |
| Peak-to-Peak Amplitude | Crest to trough; maximum displacement of the particles of a medium |
| Energy | The amount of _______ carried by a wave is related to the amplitude of the wave. |
| Equilibrium position | The "resting" position: no wave movement/disturbance |
| Displacement | Distance that a point is moved from its normal non-vibrating position |
| Wavelength | Distance from one point of a wave to the same point on the next adjacent wave |
| Cycle | Time needed for a "complete round trip"' 360 degrees |
| Period (T) | Time required to complete one cycle |
| Frequency (f) | Number of cycles per second of time |
| Phase | Point in the cycle of a waveform; measured as an angle, relative to the degrees of a circle |
| Constructive interference | Addition of two waves when the crest of one overlaps the crest of another, so that their individual effects add together. The result is a wave of increased amplitude. |
| Destructive inference | The crest of one wave overlaps the trough of another and the their idividual effect are reduced |
| Beats | Two sounds with a small difference in frequency, moving slightly in and out of phase with each other, producing a pulsation of amplitude. DROP THE ______ !!! |
| Velocity (v) | Rapidity or speed of motion; 1,100 ft/sec |
| Frequency & Period | f = 1/T |
| Sound propagation and interference - 3 points | Absorb, continue, reflect |
| Complex waves | May be impulsive and oscillatory (repeating) but are not pure tones |
| Nonsinusoidal oscillatory waves | Sinusoidal waves that are related harmonically to one another |
| Periodic complex waves | Amplitude vs. Time or Amplitude vs. Frequency |
| Complex sounds | Have energy distributed at more than one frequency |
| Periodic | Repeating |
| Aperiodic | Non-repeating |
| Fundamental frequency (F0) | Lowest frequency of a complex wave |
| Harmonics | whole-number multiples of the F0 |
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