COMD 5070 Spectra - FFT, LPC Week 3,
Lecture 1, Part 2 with Complete Solutions
Does the vocal tract transfer function apply when sound is being phonated or
whispered? - ANSWER-both
Is the FFT display useful for displaying features of the sound source or the vocal tract
filter? - ANSWER-the sound source
Is the LPC display useful for displaying features of the sound source or the vocal tract
filter? - ANSWER-vocal tract filter
T or F: The LPC spectrum will show us what the vocal tract is doing - what its
resonance frequencies are relative to one another. - ANSWER-T
What are formants? - ANSWER-resonant energy peaks in the vocal tract transfer
function
What are the two spectrum discussed in this class? - ANSWER-FFT and LPC
What do peaks of an LPC spectrum represent? - ANSWER-formants
What do peaks on an FFT spectrum represent? - ANSWER-harmonic components
What does a FFT spectrum show us? - ANSWER-shows us the range of harmonics that
are present in sound, each peak shows a harmonic
What does FFT stand for? - ANSWER-fast Fourier transform
What does LPC stand for? - ANSWER-linear predictive coding
What does the LPC show us? - ANSWER-spectral envelope
What does the LPC spectrum reveal - ANSWER-what the vocal tract filter is doing
What will FFT not show us very well? - ANSWER-formants
