11. Go back to the real time window and hit the Collect button. Sound the tuning fork and listen to the tone. Then one partner (the best singer) should sing at that pitch and try different vowel sounds. Look at the waveforms for(long vowels); and ah, eh, ih, etc., and find the one that appears the most sinusoidal. Hit Stop for this waveform, and measure the period as before. Record this vowel in cell E52, the time values in cells B56:C56, and the number of cycles in cell D56 on the Worksheet.
12. Switch over to the FFT Graph and measure the average peak frequency of the fundamental. Record the value in cell B60. Also record the frequencies of any other significant peaks that you observe in cells C60:E60
13. Still
in the real time window, hit the Collect button. One partner should
speak into the microphone the sound of the vowel (long)
,
"a-a-a-a". Hit the Stop button. The real time plot looks fairly
complex. Repeat the zoom-in and measure the time coordinates at the ends
of the waveform. Record the time values in cells B64:C64, and the
number of cycles in cell D64.
14. The FFTGraph can be used to reveal some information about the sound that was made. The major band of frequencies at which your vocal tract resonates is called the formant of this particular sound. Use ANALYZE...Examine to determine the peak frequency or frequencies of this vowel, along with the approximate range of frequencies that it covers. Record these values in cells B82:C82. Record the properties of any secondary peak frequencies that are present in cells D82:E82.
15. Under
the EDIT menu, select COPY. Go to the Worksheet and
paste the frequency plot in the space indicated, at cell B85.
SIZE the graph so that it does not extend beyond column G.
16. Take the tube and pronounce the vowels into it so your partner can hear you. Determine which of the long vowels is most intelligible; which is least intelligible? Record these findings in cells D111 and D113.
17. As you pronounce the most intelligible vowel through the tube, hit the Collect button to obtain a full trace. Hit the Stop button.
18. Under the EDIT menu, select COPY. Go to the Worksheet and paste the frequency plot in the space indicated, at cell B115. SIZE the graph so that it does not extend beyond column G.
19. Go back to the real time window and hit the Collect button. The other partner should now enunciate the consonant "s-s-s-s-s". (Don‘t say "ess", but reproduce the way the letter sounds in a sentence). Use the FFTGraph to reveal some information about the sound that was made. Record your observations in response to Question 4 on the Worksheet.
20. Print out the Worksheet
and use it to develop your lab report at home.