Frequency

In addition to amplitude, frequency is one of the fundamental aspects of sound. Amplitude is the strength of the air pressure waves, and frequency is how frequently those waves occur. It is the strongest factor in determining pitch.

One of the most fundamental facts about frequency to remember is that humans can hear 20-20000 Hz. Then you need develop familiarity with which types of sounds exist within which frequency range.

It is also important to remember that sounds do not exist as a single frequency but are constituted by a collection of frequencies.

Make sure to watch the last video!

The difference between frequency and pitch: https://www.musicradar.com/how-to/understanding-the-difference-between-pitch-and-frequency

National Library of Medicine: The Audible Spectrum https://www.ncbi.nlm.nih.gov/books/NBK10924/

Wikipedia article on hearing range: https://en.wikipedia.org/wiki/Hearing_range

“The Difference Between High-, Middle- and Low-Frequency Noise” (with notes on sound-proofing): https://www.soundproofcow.com/difference-high-middle-low-frequency-noise/

“A Look at Audio Frequency Range and Audio Components” (with notes about speakers) https://www.digikey.com/en/articles/a-look-at-audio-frequency-range-and-audio-components

about spectrographs: Seeing sound: What is a spectrogram? (British Library) https://blogs.bl.uk/sound-and-vision/2018/09/seeing-sound-what-is-a-spectrogram.html

frequency and pitch: https://www.youtube.com/watch?v=6WIDhLeryWM

frequency and pitch including a simple explanation of how changing pitch of recorded sounds works: https://www.youtube.com/watch?v=ZjvuiOSo3ow

the audio spectrum (essential!) https://www.youtube.com/watch?v=bPAqLdnA7-0