In this video you will see that you can actually hear sounds way beyond 20 kHz?! How can we explain this?! Isn't it that humans can just hears sounds just between 20 Hz and 20 kHz?! Did they lie to us?!
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Video description:
We all learn in school or somewhere else that we humans can hears sounds with frequencies between 20 Hz and 20 kHz and most people can't even hear that. The hearing range is typically more narrow depending on the person and the age. But in this video you will see that you can hear way higher frequencies! Or can you?! How can we explain this?
The video will show you what happens with a signal like sound when we sample it. How does this process effects the spectrum of the signal. You will also see what exactly is a spectrum of a signal and what can we read out of it. What role does the sampling frequency have?
You will also see how the spectrum of a sine wave looks and how it changes when we sample it. As well as how to choose the right sampling frequency. What happens if we choose a to low sampling frequency. What happens to the spectrum. And see on different examples how this sounds. What is the aliasing effect?
We will also dive into the math of digital signal processing. How to mathematically represent the sampling process. What is a delta function/Dirac delta function? What is a sequence of delta functions and why is it useful.
You will also see what are harmonics or overtones and how they change the sound. And how to identify them in a spectrum.
==⏱===Timestamps===⏱==
0:00 You can actually hear sounds way beyond 20 kHz?!
1:08 What is the spectrum of signal? How to read it?
2:07 What happens when we record a signal?
2:34 Sampling process mathematically explained
2:41 What is the Dirac delta function?
3:40 Sequence of delta function and its Fourier series
4:07 What happens to the spectrum when we sample it?
4:34 Examples. How a too low sampling rate effects the sound?
5:35 Nyquist criterion
5:50 How the sampling process effects the spectrum of a sine wave?
6:52 Aliasing effect explained trough samples
7:19 How can electrons be so slow, while electrical energy flows with the speed of sound?
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