| Program | Source File | Description |
|---|---|---|
| all_signals | all_signals.f90 | Plays sequentially each type of available signal. |
| arpeggios | arpeggios.f90 | Arpeggios played in various ways using the circles of fifths https://en.wikipedia.org/wiki/Arpeggio |
| blues | blues.f90 | A random walk on a blues scale. |
| chords_and_melody | chords_and_melody.f90 | A sequence of synth chords is repeated, and the corresponding notes are played randomly by plucked strings. |
| demo_effects | demo_effects.f90 | All available audio effects are applied sequentially on a chord sequence. |
| doppler_effect | doppler_effect.f90 | A simulation of Doppler effect, with a car passing in front of you. https://fr.wikipedia.org/wiki/Effet_Doppler The Observer is static at the origin, the car is Moving along x at a constant velocity v ^ y | *M*y0**> | ----x0-----------------O-------------------> x | The frequency perceived by the observer (Doppler effect) is fobs = f / (1 - vr/c) but we don't need to compute it. The signal heard by the observer at tobs was emitted earlier by the car at t, from a distance r(t): tobs = t + r(t) / c By developing r(t) we can finally obtain a quadratic equation: (c*2-v2) * t2 - (2tobsc2 + 2x0v) t + (tobs2 * c2 - x02 - y*2) = 0 The time t is the unique physical solution of that equation: |
| drone_music | drone_music.f90 | Experimental drone music. |
| drum_machine | drum_machine.f90 | A rhythm following a pattern stored in an array. |
| misc_sounds | misc_sounds.f90 | Miscellaneous signals, especially obtained by frequency or phase modulation. A WAV file is created for each sound. |
| shepard_risset_glissando | shepard_risset_glissando.f90 | A Shepard-Risset glissando, giving the illusion of an ever increasing pitch. It is the continuous version of the Shepard scale. It is not perfect, as we can hear that globally the whole is getting slowly higher. It is also visible when zooming in the waveform woth audacity. Some kind of beating might occur due to the fact that in the sin(), both omega and t are varying at each step. But as the f() are now redefined regularly, things are unclear for the moment... https://en.wikipedia.org/wiki/Shepard_tone |
| shepard_scale | shepard_scale.f90 | A Shepard scale, giving the illusion of an ever increasing pitch in the first half of the tape and an ever decreasing pitch in the 2nd half. Shepard, Roger N. "Circularity in Judgments of Relative Pitch", The Journal of the Acoustical Society of America 36, no. 12, (December 1, 1964): 2346–53. https://doi.org/10.1121/1.1919362. https://en.wikipedia.org/wiki/Shepard_tone |