Spectral analysis Frequency gives pitch; amplitude gives volume sampling at -8 kHz phone, -16 kHz mic(kHz=1000 cycles/sec) p ee ch 10000 10000 Fourier transform of wave yields a spectrogram darkness indicates energy at each frequency hundreds to thousands of frequency samples HUMAN COMPUTER INTERACTIONSpectral analysis Frequency gives pitch; amplitude gives volume • sampling at ~8 kHz phone, ~16 kHz mic (kHz=1000 cycles/sec) Fourier transform of wave yields a spectrogram • darkness indicates energy at each frequency • hundreds to thousands of frequency samples 1/28/2021 HUMAN COMPUTER INTERACTION 10 s p ee ch l a b