as a longitudinal wave
The part of a longitudinal wave where the particles of the medium are close together.
The part of a longitudinal wave where the particles of the medium are far apart
Unit of measurement for frequency
Perception of the energy of a sound
What is quiet or soft sound?
The lowest amplitude
What is volume?
The amount of sound depends on the amount of particles disturbed. The more particles disturbed, the louder the sound.
What is highest pitch?
High frequency or faster the waves travel (speed).
What are particles?
Tiny or very small
2. Something the vibrations can travel through (air)
3. Something to receive the vibrations (ears)
What is a form of energy that travels in waves?
What are we measuring when we measure a sound wave's frequency?
the pitch or speed of the vibration (sound wave) that occur in one
What is sound?
A form of energy that travels in waves.
Vibrations that travel through the air or other particles and can be heard by ears
What must you have in order to have sound?
To have sound, we must have:
1. Something to produce vibrations (vocal cords, piano, etc)
Sound travels through a medium as a longitudinal wave
How does sound travel?
The difference between compression and rarefaction is the compression is when the particles are closer together
What is the difference between compression and rarefaction? How would you describe the sound?
Sound can travel
audible to human hearing: about 20 to 20,000 Hz
The interval between two sounds that have a frequency ratio of 2:1
The low range of the audible frequency spectrum; usually from 20 to 320 Hz
The part of the frequency spectrum to which humans are most sensitive; the frequencies
A film soundtrack, or everything audiences hear when they watch a film, is composed of three elements. What are they?
(2) sound effects
sound in the film that is part of the imagined story world.
any sound in the film that is not part
cycle per second
Frequency ratio of 2:1
measured in dbSPL
Range of Human Hearing
to get a good recording
put the sample rate at double the frequency
listening to identify the source of a sound. most common form of listening
10^5 = 100000; 2^5 = 32
when a vibrating object forces another object to vibrate
- usually used to magnify sound
if you force an object into vibration what will happen?
it will produce a larger sound because more air molecules are vibrating
examples of forced vibrations
- produced by the physical vibration of objects
- vibration causes pressure changes in the medium (e.g. air)
- air molecules bunch together
- air molecules spread apart from the vibrating object (expansion)
- the part of the cycle that the sound pressure wave
A longitudinal wave consisting of compressions and rarefactions, which travels through a medium
repeated to and fro movements
A wave in which the particles of the medium move parallel to the path of the wave
The part of a longitudinal wave where
Enclosures typically falls into 2 categories:
sealed and bass reflex
having an output that varies in direction proportion to the input
signal in the reproduced sound that was not part of the original
Harmonic Distortion (THD)
harmonics in output are not present at input
sense of sound
2 things we need for hearing
pressurized sound wave, and a hair cell
auditory canal/external auditory meatus
where sound enters after outer ear
causes 3 bones to vibrate in order from malleus, incus, stapes (MIS) or hammer anvil
What is sound
wave that is pressure transmitted through a solid, liquid, or gas composed of freq within range of hearing
What does frequency do
What is frequency measured in
What do hertz equal
cycles or vibration per second
What does kHZ equal
1000hz or kilohertz
vibrate back and forth in the same direction (left/right) of the wave motion (left to right. Sound is a longitudinal Wave!)
are part of the sound wave where air particles are forced apart
part of the sound wave where air particles are forced close together
to make a sound louder
person who tests and treats people who have trouble hearing
tool used to test a person's range of hearing
mass of nerve cells and fibers in the skull. The organ of consciousness
signal used to represent letters or numbers
complexity of sound that allows us to differentiate pianos from trombones from tubas etc
Pinna (cartilage part that erryone see), ear canal. Collects sound waves
Tympanic membrane (eardrum), malleus, incus, stapes (three ossicles), which connect the eardrum to the oval
parts of a standing wave
it has nodes
part that appears to not move
part that seemingly moves
describe the doppler affect
how when you pass a siren or a sound in general the frequency and pitch seem to change depending on how far away you are or where you are compared to it.
perpendicular to direction that energy travels
medium moves parallel to direction that energy travels
medium moves in a circular motion while energy passes
highest point of a wave
lowest point of a wave
distance between 2 crests or between 2 troughs
the eardrum to the inner ear
What do the ossicles do?
connect the eardrum to the inner ear, move back and forth in response to the movement of the eardrum
What is the eardrum?
the tympanic membrane
What does the eardrum do?
sympathetically vibrates with the incoming sound
What are the eustacian tubes?