P-4 Audio

Good afternoon!

In this new post we are going to learn about different waveforms and how they are listened by us.

Depending on the frequency of the signal, the tone we listen is higher or lower. Human ears are supposed to be able to hear frequencies between 20 Hz and 20 KHz. Human voice is supposed to have a frequency between 33 Hz and 3 KHz. So there's no human being capable of screaming at a non-hearable frequency.

In this practice I want you to generate tones and research about their features:

Task list: Answer in the mail or in a word document. You will only have to send me this document

1.- Generate a sinusoidal 30 Hz - 5 seconds-long wave. Can you hear it? How does it sound?
2.- Generate a sinusoidal 2KHz - 5 seconds-long wave. Can you hear it? Compared to the last, how does it sound?
3.-  Generate a sinusoidal 1Hz - 5 seconds-long wave. Can you hear it?
4.-  Generate a sinusoidal 400KHz - 5 seconds-long wave. Can you hear it? Why?
5.- Try to generate different frequency sinusoidal waves. Which is your frequency-listening limit?
6.- Generate a sinusoidal 1KHz tone. Generate a squared 1KHz tone. Generate noise. Which are their differences?
7.- Generate a DTMF (Dual Tone Multifrequency). What does this remind you?
8.- Look for information in Internet about the DTMF. Llok for the frequencies used in each number in a mobile phone. Can you generate DTMF tones in Audacity related to your mobile phone?

Send the document to my mail or answer directly in it.

If you answer in English you will have the chance of getting an extra point.

Good luck!

Xavi