spectra & spectrograms - exam 1

Question 1

power spectra

Answer 1

shows individual freqs & their amps

used to identify harmonics or component freqs in sound

Question 2

spectrograms

Answer 2

visual representation of the spectrum of freqs in a sound signal as it varies w/ time

Question 3

wideband spectrogram

Answer 3

good for viewing formants

good temporal resolution but less freq detail

Question 4

narrowband spectrogram

Answer 4

good for viewing harmonics

detailed freq info but less temporal precision

Question 5

spectral envelope

Answer 5

smooth curve that outlines the peaks of the spectrum

represents overall energy distribution across freqs

Question 6

spectrum vs spectrogram

Answer 6

spectrum = displays freq content at a single moment in time

spectrogram = shows how freq changes over time

Question 7

identifying harmonics in a spectrum

Answer 7

appear as distinct peaks spaced at multiples of the fund freq

Question 8

identifying harmonics in a spectrogram

Answer 8

appear as horizontal lines - especially in narrowband spectrograms

Question 9

indentifying formants in a spectrum

Answer 9

broad peaks that indicate resonances

Question 10

identifying formants in a spectrogram

Answer 10

dark horizontal bands - more visible in wideband