1 00:00:01,69 --> 00:00:02,16 Let's take 2 00:00:02,17 --> 00:00:09,02 a listen to some different frequencies. Frequency relates to pitch in world of sound. 3 00:00:12,79 --> 00:00:19,71 Here is 440. Pure sine wave 4 00:00:19,72 --> 00:00:22,96 440. Square wave 5 00:00:26,80 --> 00:00:33,34 Sawtooth wave. Triange. 6 00:00:33,35 --> 00:00:39,21 Back to our pure sine wave. What happens if we jump to 880? 7 00:00:46,94 --> 00:00:53,03 An octave. And how about 1760. Other octave A. 8 00:00:56,16 --> 00:00:56,85 Let's bring down our amplitude. 9 00:01:06,31 --> 00:01:07,76 This frequency player can be found at onlinegenerator.com. 10 00:01:14,27 --> 00:01:17,86 Here's another tone generator also an online version 11 00:01:21,85 --> 00:01:27,91 at nison.com. Let's see what we have. You can barely hear it. 12 00:01:29,74 --> 00:01:33,40 174.61 hertz 13 00:01:36,47 --> 00:01:37,08 It's G at 14 00:01:37,09 --> 00:01:45,97 196 hertz. Hertz being cycles per second. Let's 15 00:01:45,98 --> 00:02:28,02 see what happens if we increase our hertz manually. And let's decrease the hertz. Here's 750. And we have different wave forms we can expirement with. And we 16 00:02:28,52 --> 00:02:35,46 can increase with our arrows, increase in hertz for cycles per second. And back down again. 17 00:02:49,50 --> 00:02:51,92 Again here's our picture of pure sine wave.