1. Our Goal for Today Record vowel sounds onto PC’s Record vowel sounds onto PC’s Analyze using Matlab Analyze using Matlab Identify characteristics of what we are really looking at Identify characteristics of what we are really looking at What patterns are you noticing between each persons frequency plots? What patterns are you noticing between each persons frequency plots?

2. Generating and Saving the.WAV Files Work in pairs, 1 mic per group Work in pairs, 1 mic per group Use Sound Recorder under Accessories Use Sound Recorder under Accessories Record all 5 vowels each Record all 5 vowels each Playback to test quality Playback to test quality Folder setup: Folder setup: –Ex. Folder Fred filename fred_a.wav – Ben ben_e.wav

3. There is Math involved With the sampling rate (fs) and the duration of the.wav the size can be found With the sampling rate (fs) and the duration of the.wav the size can be found What is the file size of a file: What is the file size of a file: –3.5 seconds long –22,050 samples per second 3.5 x 22,050 = 77,175 bytes 3.5 x 22,050 = 77,175 bytes

4. Notable Frequency Info CD’s, fs = 44,100Hz CD’s, fs = 44,100Hz Voice recording, fs = 22,050Hz Voice recording, fs = 22,050Hz Human Speech, fs < 4,000Hz Human Speech, fs < 4,000Hz FM Radio (Frequency Modulation) FM Radio (Frequency Modulation) –High carrier frequencies to separate the different stations –Uses cosine waves