Audio Engineering Interactive

Settings

Sound

Start quietly, then adjust the system volume. Sound only starts with the speaker button in a module. A limiter at the output catches level peaks. In the harmonic series the level refers to the RMS value: if you flip individual phases, the waveform changes a lot but the sound hardly at all.

Level calibration (dB SPL)

Applies to the modules “Decibels and phons” and “Masking and masked threshold”. The level ratios between the tones are always right, the absolute dB SPL values only after calibration: play the calibration tone and set the reference or the system volume so that a sound level meter at the headphones or listening position reads 94 dB. Do not change the volume afterwards. Without calibration and with arbitrary headphones, the threshold of hearing and the isophones are only approximate.

MIDI keyboard

Applies to the harmonic series: a key sets the fundamental f₀, the sound plays while it is held. With several keys the last one pressed wins. Pitch bend detunes by up to ±2 semitones. The setting is remembered; a keyboard plugged in later is detected automatically.

License & Usage

All modules on this website may be used freely – in class, in presentations, on learning platforms and for self-study.

Content, texts and graphics are licensed under Creative Commons Attribution-ShareAlike 4.0 (CC BY-SA 4.0). Please credit the source (jhkramer.de) when reusing them. CC BY-SA 4.0

The source code is licensed under the MIT License.