Looking at Spectrogram in Praatcs4706, Jan 30

Fadi Biadsy

Praat

• http://www.fon.hum.uva.nl/praat/• Developed by Paul Boersma and David

Weenink   Institute of Phonetic SciencesUniversity of AmsterdamThe Netherlands

• General purpose speech tool: editing, segmentation and labeling, audio DSP, prosodic manipulation

Praat

• Pros: designed for speech analysis (not only sound edition or spectrogram visualization), nice GUI, scripting, active development and community, prosodic manipulation

• Cons: limited scripting language, slow GUI

Let’s…

• See the pitch contour of Solfege: • Compare the spectrograms of

1.  It’s hard to recognize speech

2. It’s hard to wreck a nice beach

• Record something with clipping• Record “it’s cool to play with praat”

– Manipulate the pitch contour– Annotate this utterance

Task1

• Record a file with all the vowels and look at the formants to see how they differ

Task2

• Record files with each consonant class as defined by manner of articular/voiced and unvoiced, all in the context of the same vowel, to see what the spectrograms look like: /pax/, /tax/, /kax/; /bax/, /dax/, /gax/

Task3

• Record something in a very loud voice, to produce clipping, and seewhat the waveform looks like

Task4

• Create a sound from equation with noise, and try to filter the noise out

Task5

• record speech with some noise (hum, transients) in the background andsee was the spectrogram tells them; try filter out the noise.

Task6

• Record a sample of the same short sentence as angry speech, sadspeech, happy speech, and see what things (pitch contour, pitch mean andmax, intensity mean and max, spectral information) differ. choose something fully voiced if possible.