Hearing science

Mass (kg)

Amount of matter that is present

Length (meter)

Distance between two points

Time (t)

Standard unit: second

Displacement (meter)

Change in spatial position

Vector

Direction sensitive (how much + which way) (ex: Force 50N downward)

Scalar

Direction independent (size, amount, value) (ex:temp and speed)

Velocity (v)

The displacement in a unit of time (m/s)

Acceleration (a)

Change in velocity in time (a= v2 - v1/ t)

Force (N)

Push or pull that generates acceleration (F=m x a)

Pressure (p)

The force applied on an area (p= F/Area(m2))

Amplitude/ Magnitude (dB

Maximum displacement (bigger means louder)

Frequency (Hz)

How fast? (Cycles per second) (pitch

To find Frequency

1/T

Elasticity

Ability for object to return to its original state after being deformed

Inertia

Resistance to changes in motion

Sine wave

simplest sound in nature

Acoustic parameters of sine wave

amplitude, frequency, phase

Ratio

Ix/Ir (Ix= the target sound intensity, Ir= 10^-12 w/m² reference sound intensity

logarithm

math tool that helps to compress giants numbers to smaller (finding the exponent) 2_?=8 = log₂ (8)

dB IL

10 Bel = 10 log₁₀ (Ix/Ir)

Bel: to compress a big number into a much smaller number

log₁₀ (Ix/Ir)

millisecond and second

1 sec = 0.001 ms

Sound acoustic energy

1 second/ meter²

Sound Intensity (w/m² )

w

Intensity range of Sound

10^-12 w/m² ~ 1 w/m2

dB SPL

deciBel Sound Pressure Level

dB IL

deciBel Intesity Level