ETM Learn
Learn sound, from foundations to depth
Each lesson: understand an idea, play with an experiment, then explore its mathematics and assumptions. Start at 01 and follow the sequence.
Sound: from air to numbers
Connect particle motion, pressure, audible sound and the numbers on a meter.
Foundations · experiments · deeper study02 / 08Build a sound from simple tones
Add sines, discover timbre and learn when a partial really is a harmonic.
Foundations · experiments · deeper study03 / 08Saturation: from wave shape to spectrum
Discover what a nonlinear curve does to a sine, then move to music and aliasing.
Foundations · experiments · deeper study04 / 08Compression: gain that moves
Learn the level rule first, then detector movement, attack and release.
Foundations · experiments · deeper study05 / 08EQ: magnitude, phase and time
Change a frequency region and connect the result to phase, group delay and impulse response.
Foundations · experiments · deeper study06 / 08Reverb: paths, reflections and decay
Follow direct sound, early reflections and the later tail.
Foundations · experiments · deeper study07 / 08Limiting: peaks and the cost of reducing them
Separate clipping, moving gain, sample peaks, reconstructed peaks and loudness.
Foundations · experiments · deeper study08 / 08Bit depth and dither: what rounding changes
Enlarge quantization steps and learn why a little noise can make error more predictable.
Foundations · experiments · deeper study