MASER

Introduction to Spectral Analysis

Phil Lockett

Centre College

KAPT meeting March 16, 2013Any Time Signal can be represented by Sums of Cosines and SinesThe signal can be represented in either theTime Domain

orFrequency Domain

Time DomainFrequency Domain3

PRAAT

Spectrogram is the Frequency Spectrum as a function of Time

TimeFrequency

Chirp

Tuning Fork Time Signal

Tuning Fork Frequency Spectrum465.82 1/s931.65 1/s

0.12time (sec)10kHzdBnV

time (sec)0.12AEP

Sound input (nuthatch quank)Spectrogram of AEP

Jeff Lucas - Purdue9

[A][i][u]

11

Vowel Formant Average Spectrograms12

Me saying ee

Vocal Fold Harmonics:1 127.2 Hz2 254.4 Hzskip to20 2544 HzPower Spectrum for ee

eeah

schwa[]orThe VowelUse schwa Frequencies to measure Vocal Tract Length

By Modeling Vocal Tract as Uniform Tube