Acoustics is the science of sonic reflection
Oscillation of air pressure = sound waves
longer wavelengths have a lower frequency, shorter wavelengths have a higher frequency
frequency = pitch
amplitude = loudness
How a microphone & speakers work:
pressurized air (sound waves) causes movement of the diaphragm (and magnet and coil) of the microphone, which creates oscillations in the electrical current
oscillations in the current causes the magnet (and diaphragm) of the speaker to move, which results in pressurized air (sound waves)
https://docs.cycling74.com/legacy/max5/tutorials/msp-tut/mspdigitalaudio.html
in digital audio the oscillating current is converted to binary values (samples) by an Analog to Digital Converter (ADC)
the binary values are converted to electrical signals by a Digital to Analog Converter (DAC)
Digital Audio is the recording of a performance (narration, music)
https://www.geeksforgeeks.org/computer-science-fundamentals/what-is-a-microphone/
CD quality sound = 44kHz (sampling rate) 16 bit (resolution) stereo = 96 dB of sound
Cassette quality = 22kHz 8 bit stereo = 48 dB
Telephone quality = 11kHz 8 bit mono
Digital audio is the cousin of raster graphics:
Large file size, fixed resolution, not malleable, not discrete
Aliasing to compensate for missed samples
Actually a serial protocol
Synthetic approximation of a live performance
Industry standard for electronically generated audio
128 voices in the MIDI orchestra
MIDI is the cousin of vector graphics
Small file size, resolution independent, malleable, discrete