Looking at Spectrogram in Praat cs4706, Jan 30 Fadi Biadsy

Praat http://www.fon.hum.uva.nl/praat/ Developed by Paul Boersma and David Weenink    Institute of Phonetic Sciences University of Amsterdam The 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 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 see what 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 and see was the spectrogram tells them; try filter out the noise.

Task6 Record a sample of the same short sentence as angry speech, sad speech, happy speech, and see what things (pitch contour, pitch mean and max, intensity mean and max, spectral information) differ. choose something fully voiced if possible.