Converting Analog Data to Binary, Sampling, Quantization - AP Computer Science Principles

Strap in, this one's gonna get a bit bumpy.
Converting from analog data to digital is a three step process. "Sampling" involves taking a sample of points from a continuous curve, such as a sound wave. Once the points have been selected, their values must be rounded off in a process called "quantization." Finally, these approximated values are further simplified, then converted into binary.
As you watch, keep these two facts in mind:
1) Analog data is infinite, digital is finite.
2) Lower intervals mean higher fidelity, but also a larger file.
Khan Academy Article:
www.khanacademy.org/computing...

[@smesui1799]

Excellent lecture Dr. Cunningham. Very clear & concise with a more modern, youthful, & invigorating tone plus using audio as an application motivator. ... I couldn't have done any better myself.

[@nathanielstubbs0005]

Thank you so much! I am doing the AP Computer Science course on Khan Academy. Your video's always help me understand things better!

[@professorcunningham8106]

Glad to hear it!

[@nathanielstubbs0005]

@@professorcunningham8106 Do you plan to make more video's on the AP Computer Science course on Khan?

[@professorcunningham8106]

@@nathanielstubbs0005 Yep! Unfortunately, I work full time as a teacher, so I don't get to make these as often as I'd like, but more are on the way when I have the time!

[@shreyasharma7352]

thank you ! Khan academy's content in this particular topic is little complex for me but you explain in a very smooth way ! THANKS TO PROFFESOR CUNNINGHAM

[@professorcunningham8106]

Thank you for the feedback! I was honestly worried this would be too dense

[@citylightskangaroo7553]

This helped me so much that I was able to sleep tonight. Thank you.

[@redsword7192]

Thank you so much!
This video helped me a lot.

[@Youcan352]

thank you, it is a great help.

[@GCKteamKrispy]

Great walk-through!

[@iqbaljaved3924]

Thank you, learned a lot and just subscribed to your channel.

[@Oscar-ul2ep]

Great vid!

[@hmmmno5926]

thank you so much youve helped me so much

[@deborahyohannes4687]

When encoding, we only change the values of y to binary. Additionally, there will be many x values. At the quantized y value (at this particular point), I didn't understand how the computer reads the values of x and y and reconstructs them. Could you explain?

[@professorcunningham8106]

Both x and y are being converted to binary. Recall that ALL data that passes through a computer is represented in binary. As for how the computer reconstructs the original X and Y, that would rely on some code providing the baseline. For example, If I know that the minimum voltage was 50 volts, and I set up the code so that 50 was my baseline, the computer would simply add 50 to any number I provided, so a value of 010, which translates to 2, could be read as 52. This allows us to compress the number of bits needed to store the data losslessly.
I don't know if that helps, but it's the best I've got for the moment. I'd love for any other computer science students or teachers to weigh in here.

[@castleold19]

It's good.

[@kenesto6262]

Can you come work at my university and teach my class please? 🥹

[@professorcunningham8106]

I'd love to, but probably not