project1b

Project 1:

Found below is a collection of words and their cooresponding phonemes in the English language. The phonemes are divided into sub-catogories that were provided by the book. Beside each word is the specific phoneme between to forward slashes (/_/) . Each word provides a link to a picture that was generated in Matlab. The figure includes a time waveform plot, a narrowband spectrogram, and a wideband spectrogram of the entire word. Each phoneme also provides a link to another Matlab figure. These pictures depict a time waveform plot of just the phoneme, a "zoomed in" portion that is either 25 ms long (for unvoiced) or 3 periods long (for voiced) of the phoneme, and then finally a FFT plot with a smoothed spectral envelope formed by linear prediction of the phoneme's zoomed in portion. In order to make the process of gathering all this data easy, the Matlab command 'input' was commonly used to ask the user questions about the sound file at hand. This allowed the m-file to be universally used for each file and therefore not requiring any modifications in code. First, you are asked the name of the word, then the name of the phoneme, and then the start and end times of the phoneme. Later, you are asked whether it is voiced or not. And depending on the answer to that question you may have to enter the start and end times for a 3 period portion. At this point, there will already be a visible plot of the phoneme, so if it is periodic you can clearly find the desired times. To see a screen shot of these questions being asked and answered, click here:

The magnitude plot of 'see' demonstrates what it looks like when noise is introduced to the phoneme and the signal begins to slant back upwards. The magnitude plots for 'up' and 'it' display the formans clearly.
At the bottom of the page is a link for the m-file made in Matlab and a .zip file of all the sounds.
(Please note that geocities.com only offers 15 MB of space for webpages, so in order to fit all this material on one page I had to interface it with another webpage account from geocities. This may result in having to
click on two links before reaching a target, but there will be text to prompt you in such a senario.)