Random sine pairs

Figure 1 summary

• timebase 90ms
• two random numbers
• two oscillators
• sum both oscillators

Two oscillators

A loadbang starts the metronome. Each 90ms a new pair of random numbers are chosen in the range 0 to 3000. The audio output is the sum of two sine wave oscillators whose frequencies are the two random numbers.

Sound effect

Groups of unrelatedly moving sinewaves invoke a water like effect. The brain can easily track two slowly moving independent random melodies, but as the speed and frequency range increase it gets more difficult. Try chaning the ranges and metronome speed to find two "fusion" points. One is somewhere between 80 - 150 ms where where we stop segregating the notes and hear a constant "stream". The other at about 20ms we stop hearing grains or steps of change and the sound fuses into a "texture".

Figure 1: sine-pairs

A-sine-pairs.ogg A-sine-pairs.pd