can you create a sound like a square wave, starting from a sine wave?.Try the same thing, playing back just a range of frequencies, but this time use the sine or square waveforms: Compare the pitch and timbre of your selections. Try playing individual peaks or groups of peaks. You should see a spectrum showing the component frequencies for the waveform. Load one of the square waves, select a section from the middle of the waveform about 1 second in length, and generate a spectral slice of this portion.Try it by selecting a large portion of the speech file, creating a spectral slice, selecting different frequency ranges and playing them. You can select a range of frequencies by dragging the mouse over part of the spectral slice, and then play just those frequencies. Praat lets you do some interesting things with the spectrum. You can generate a spectrum of a portion of speech by first dragging to select some waveform and then clicking on the spectrum menu and selecting view spectral slice. You can add a spectrogram, by selecting the spectrum menu and clicking show spectrogram. Notice that you can play selected parts of the waveform by dragging to select and then clicking on the ‘button’ that appears under the selection. Work out how to zoom in and out, like you did with Wavesurfer. This opens a window containing the speech and an f0 trace. If you want to view the waveform click the View & Edit button. You should now have an object in the object list called Sound kdt_001. To load a file into Praat click on the Open menu and select read from file. The main Praat window shows a list of loaded objects (currently an empty list), and a list of action buttons that can be used to manipulate objects. You can immediately close the praat picture window: it is not needed for this exercise. Praat will open two windows on the screen, one called praat objects and one called praat picture. Praat and Wavesurfer share many of the same functions, but sometimes one does particular things better than the other Praat does a lot of things that Wavesurfer can’t. Today we are going to use another speech analysis program to look at waveforms. If you don’t have the files, go back to the instructions for lab 1 and copy the files again. Go into the folder you created last time and check they are still there: This lab uses the same files as the previous exercise. Praat is more powerful than Wavesurfer, and can perform various useful and interesting manipulations of speech.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |