complex signals

Question 1

sinusoidal sounds

Answer 1

single frequency

pure tone

Question 2

complex sound

Answer 2

contains more than one frequency

period = repeating pattern

periodic = no pattern

Question 3

fourier transform

Answer 3

decompose a waveform into spectral (frequency) components

cochlea does this

Question 4

time frequency trade off

Answer 4

good temporal resolution –> poor spectral resolution

short time window –> poor spectrum

vice versa

Question 5

how does harmonicity come about in complex sounds

Answer 5

multiple frequency tones add linearly

if they are related to the fundamental, they produce a harmonic

Question 6

aperiodic complex sounds

Answer 6

don’t have a period

equal amount of all frequencies

white noise

Question 7

am modulated sounds

Answer 7

amplitude modulation

variation in amplitude, freq stays the same

Question 8

fm modulated sounds

Answer 8

frequency modulation

variation in freq, amplitude stays the same

Question 9

modulator frequency

Answer 9

envelope

Question 10

carrier frequency

Answer 10

fine structure

how many peaks per modulator peak

Question 11

harmonics

Answer 11

multiples of the fundamental frequency