20566090
Description
Flashcards by Christopher Moore, updated more than 1 year ago
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Created by Christopher Moore
almost 5 years ago
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| Question | Answer |
| What Is Sound? | A Longitudinal Wave Disturbance In Any Compressible Substance (Especially Air) |
| What Is Sound To Us? | The Perceptual Object "Heard" In The Brain When These Waves Stimulate The Human Ear |
| Sound Production Sound Propagation Sound Perception | How Sound Is Created (Vibrations) How Sound Travels Between Places (Waves) How It effects The Senses And Emotion Of The Listener |
| Longitudinal Waves Transverse Waves | Wave Motion and Particle Motion are Parallel To Each other. Also Known As Compression Waves Wave Motion and Particle Motion are Perpendicular To Each Other. |
| Compression Rarefraction | When the waves are closer then average When the waves are further away then average |
| Wavelength | The Distance From The Start Of One Complete Wave To The Start Of The Next |
| Speed of Sound At (T=20) in dry air | Air = 344m/s CO2 = 270m/s Helium = 1000m/s Water = 1500m/s Steel = 6000m/s |
| Increase In Sound Speed For Every Degree Increase | 0.6m/s At Higher temperatures random molecule motions are faster causing the sound disturbance to pass on quicker |
| Sound Amplitude | Measure of The Strengh of Sound |
| Displacement Amplitude | Distance each bit of air moves to either side from its normal position during vibration |
| Pressure Amplitude | Maximum increase of air pressure above normal atmosphere pressure in a sound wave compression Very Small differences but can be picked up by a microphone |
| Timescales of Musical Events | Long - Several second to Hours Medium - Fractions of a second to several seconds Short - Individual Vibrations (Can be millionths of seconds) |
| Frequency | The repetition rate of a vibration measure in HZ or Cycles per second Concert Pitch is A440HZ |
| Sinusoidal Motion | A Fixed periodic motion where amplitude and time are constant. |
| Excitation | Exciting an instrument/The Motion which sets the sound in motion |
| Transient | A Sound That is not sustained |
| Periodic Sound | A Sound which has a constant wave such as a synth |
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