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Sound & Acoustics

a presentation for my English course
by

Denis .

on 7 September 2013

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Transcript of Sound & Acoustics

Acoustics
scientific study of sound
studies generation, transmission and reception of sounds
Physical acoustics
related to organs of speech and hearing
Biological acoustics
sound
-movement of waves in elastic media
-periodic change of air pressure which spreads through gases, liquids and solids at a determined speed
sound
-mechanic vibrations that can be heard by humans
-vibrations are transmitted from one particle onto another
-impossible in vacuum
Velocity
-speed of sound
-measured in m/s
-depends on physical properties of a medium
Wavelenght
-distance between 2 similar points on a sound wave
λ=v/f [m]
Frequency
-number of vibrations in a second
-16Hz to 20kHz
Amplitude
-the greatest distance a sound vibrates
-bigger the amplitude, bigger the intensity
Intensity
-amplitude squared
-amount of energy that passes through the surface of 1m squared within a second
Objective parameters
-Alexander Graham Bell
Subjective parameters
properties that are percieved and depend on the sensory processing of the listener
Loudness
Pitch
Timbre
pleasantness, consonance, harmony...
Types of sound
Pure tone
-with sinusoidal waveform
-artificial (not found in nature)
Complex sound
-consists of the pure tone and tones of higher frequencies
Noise
-unwanted random vibration
-no constant frequency or amplitude
Bang
-a short impulse of great intensity
Reflection
-lesser roughness and higher density
-echo
Diffraction
-the instance of a sound bending over the edge of the barrier
Refraction
-the change in direction of a propagating wave
-change in the medium (temperature, air pressure etc.)
Absorption
-occurs during reflexion
Doppler Effect
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
The End
Sound and acoustics
Denis
Faculty of Humanities and Social Sciences
Department of English Languange and Literature and Information Sciences
Full transcript