Sound and listening
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What is sound
We experience sound thought displacement of air molecules from a source to a the receiver.
When a source emits a sound, it makes the air molecules compress and decompress, traveling away from the source.
The rate of this compression-decompression variation is what is called the frequency of a sound. And the amount of air molecules displace give us the amplitude or volume of a sound.
Sound wave properties
- frequency = pitch
- measured in Hertz (Hz) or cycle per second. 1Hz = 1cycle/sec
- amplitude = volume
- measured in decibel (db)
Sound waves on liquid
audible sound
Human audible sound is located between 20Hz and 20 000Hz of of the acoustic spectrum
How we listen
Hearing as composing
Expanded listening
- contact mics
- electromagnetic pickups