Fixed point audio library for embedded synths
I made this library for making audio come out of a teensy 3.2 without using Paul Stoffregen's Audio library, which is lovely, but I like doing things from scratch.
This library lets you do common dsp things with Q-notation - which is a way of representing and manipulating floating point numbers with fixed point numbers. See here: https://en.wikipedia.org/wiki/Q_(number_format)
So basically it helps you manipulate qfloats which are 32 bit ints, but represent floats. e.g.
typedef int32_t qfloat;
There are 3 modules in the library: qfloat, qdsp, and qmusic.
qfloat takes care of converting between floats and qfloats (and a secondary type called an lfloat which is less accurate than qfloat but allows for bigger numbers.
qdsp is a bunch of dsp classes for doing things like oscillators, filters envelopes etc.
qmusic is some chromatic music helpers for scales and chords etc.
Motivation: Teensy 3.2 does floating point maths a lot slower than int maths, I guess it's a hardware thing, maybe it doesn't have an fpu, or maybe it does and it's slow.