## Recap From Day 075

Day 075, we started looking at sound waves. You can catch up using the link below.
**100 Days Of ML Code — Day 075**
*Recap From Day 074*medium.com

Today, we will continue from where we left off in day 075.

## Sound Waves Continued.

It turns out that sine waves are a very important function for us to think about. Below is a sine wave.

*Adapted From Here*

Let’s look at some of its properties now. The first one is Amplitude.

### Amplitude

“The

amplitudeof a periodic variable) is a measure of its change over a single period) (such as time) or spatial period).”

*Adapted From Here*

Amplitude is the maximum displacement of points on a wave, which we can think of as the degree or intensity of change. As seen above, it is the y axis. And it’s going to go typically from negative one to positive one. And then the horizontal line across the middle represents the zero point. And so we can think about this as a lot of different things that the amplitude is representing.

We can think about it as a speaker cone pushing and pulling. kind of back and forth to create sound waves. We can think about it as kind of air molecules that are kind of pushing and pulling back and forth as the sound wave is propagating through space. We can think of it as our ear drum Pushing and pulling back and forth in response to the sound waves, but we can think about it as a violin string that’s vibrating back and forth.

And so on and so forth, but literally it’s this measure of kind of how much is something, going back and forth. How much is it vibrating or pushing and pulling or something like that and what is the the magnitude of that change?

And so what we can think about individual values at particular moments time, what is my amplitude value. We don’t have to think about it more generally in terms of the notion of an envelope. The envelope of something is kind of a gradual change. Envelope is a very important thing in terms of amplitude and in fact in terms of other parameters in music that we can control gradually, and gradually change them over time.

That’s all for day 076. I hope you found this informative. Thank you for taking time out of your schedule and allowing me to be your guide on this journey. And until next time, be legendary.