Theorems

Question 1

Nyquist theorem

Answer 1

A periodic signal must be sampled at more than twice the highest frequency component of the signal

Question 2

Lossy data compression

Answer 2

Used psychoacoustics to try to minimize subjective quality loss

Question 3

Fletcher Munson Curve

Answer 3

DBSPL
Varying absolute intensities that had the same loudness to the ear at various frequencies
- we hear low and high frequencies poorly

Question 4

Signal to noise ratio

Answer 4

Doorway metaphor
Top of head being nominal sound
Doorway top being clipping, space between being headroom
Noise being the lip of the doorway by the feet

Better = more dynamic range

Question 5

Magnetic field hand rule

Answer 5

We can remember this diagram using the right-hand rule. If you point your pointer finger in the direction the positive charge is moving, and then your middle finger in the direction of the magnetic field, your thumb points in the direction of the magnetic force pushing on the moving charge