![]() How much difference does it make where in the syllable you choose to analyze?Ī document with screenshots from Praat showing your work, with any appropriate additional commentary. What periods correspond to the frequencies of the first and second formants? Can you find evidence of oscillations at those frequencies in the time waveform?Ĭhoose three syllables in the phrase, and perform the same analysis of F0, F1, F2 and F3 - by the same methods - as for the six isolated vowels. Make a spectral slice over an appropriate window, and measure the formants in it. Make a wide-band spectrogram and estimate the formants from looking at it. Determine the first, second and third formant frequencies during the same region of time as your pitch determination, using three different methods: Make a spectral slice over an appropriate window, and measure the frequency of some prominent higher harmonic (5th, 10th, whatever). Make a narrow-band spectrogram, find the fundamental frequency, and measure it. (The reason to measure several pitch periods is to make the consequences of measurement uncertainty smaller - try comparing measurements of individual pitch periods.) If you don't know what "pitch periods" look like, expect to learn this in the lab session, or ask about it - and similarly for other analysis methods cited below. Measure several pitch periods (taken together) in the time waveform, and convert to frequency. Determine the fundamental frequency of the syllable (at some representative place in the middle) by four different methods: In the file SA1.WAV, you'll find a short sentence from the TIMIT database.ĭownload these files into a convenient local directory to work on, and play them so that you know what you're dealing with.įor each of the six files a1-6.wav, read the file into Praat, and:Ī. In the files a1.wav, a2.wav, a3.wav, a4.wav, a5.wav, a6.wav, you'll find six short and simple utterances, each consisting of a more-or-less stable vowel produced at a more-or-less constant pitch. Fundamental frequency (F0) refers to the highest common factor of a periodic waveform, measured in Hz (or kHz). The pupose of this lab is to ensure that you have a practical understanding of the concepts of frequency, period and wavelength, as related to speech sounds and as seen in time waveforms, spectral slices, and spectrograms.
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