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Sound & Acoustics
Transcript of Sound & Acoustics
scientific study of sound
studies generation, transmission and reception of sounds
related to organs of speech and hearing
-movement of waves in elastic media
-periodic change of air pressure which spreads through gases, liquids and solids at a determined speed
-mechanic vibrations that can be heard by humans
-vibrations are transmitted from one particle onto another
-impossible in vacuum
-speed of sound
-measured in m/s
-depends on physical properties of a medium
-distance between 2 similar points on a sound wave
-number of vibrations in a second
-16Hz to 20kHz
-the greatest distance a sound vibrates
-bigger the amplitude, bigger the intensity
-amount of energy that passes through the surface of 1m squared within a second
-Alexander Graham Bell
properties that are percieved and depend on the sensory processing of the listener
pleasantness, consonance, harmony...
Types of sound
-with sinusoidal waveform
-artificial (not found in nature)
-consists of the pure tone and tones of higher frequencies
-unwanted random vibration
-no constant frequency or amplitude
-a short impulse of great intensity
-lesser roughness and higher density
-the instance of a sound bending over the edge of the barrier
-the change in direction of a propagating wave
-change in the medium (temperature, air pressure etc.)
-occurs during reflexion
change of sound pitch because of the moving sound source
Propagation of sound
incoming source - increasing frequency
-conversion of energy
source going away - decreasing freq.
-if the barrier is not big, it barely affects the propagation of the wave
THANKS FOR LISTENING
Sound and acoustics
Faculty of Humanities and Social Sciences
Department of English Languange and Literature and Information Sciences