Librariessignals.lib
A library of basic elements to handle signals in Faust. Its official prefix is si.
Functions Reference
(si.)bus
n parallel cables.
bus is a standard Faust function.
Usage
bus(n)
bus(4) : _,_,_,_
Where:
n: is an integer known at compile time that indicates the number of parallel cables.
(si.)block
Block - terminate n signals.
block is a standard Faust function.
Usage
_,_,... : block(n) : _,...
Where:
n: the number of signals to be blocked
(si.)interpolate
Linear interpolation between two signals.
Usage
_,_ : interpolate(i) : _
Where:
i: interpolation control between 0 and 1 (0: first input; 1: second input)
(si.)smoo
Smoothing function based on smooth ideal to smooth UI signals
(sliders, etc.) down.
smoo is a standard Faust function.
Usage
hslider(...) : smoo;
(si.)polySmooth
A smoothing function based on smooth that doesn't smooth when a
trigger signal is given. This is very useful when making
polyphonic synthesizer to make sure that the value of the parameter
is the right one when the note is started.
Usage
hslider(...) : polySmooth(g,s,d) : _
Where:
g: the gate/trigger signal used when making polyphonic synthss: the smoothness (seesmooth)d: the number of samples to wait before the signal start being smoothed aftergswitched to 1
(si.)smoothAndH
A smoothing function based on smooth that holds its output
signal when a trigger is sent to it. This feature is convenient
when implementing polyphonic instruments to prevent some
smoothed parameter to change when a note-off event is sent.
Usage
hslider(...) : smoothAndH(g,s) : _
Where:
g: the hold signal (0 for hold, 1 for bypass)s: the smoothness (seesmooth)
(si.)bsmooth
Block smooth linear interpolation during a block of samples.
Usage
hslider(...) : bsmooth : _
(si.)dot
Dot product for two vectors of size N.
Usage
_,_,_,_,_,_ : dot(N) : _
Where:
N: size of the vectors (int, must be known at compile time)
(si.)smooth
Exponential smoothing by a unity-dc-gain one-pole lowpass.
smooth is a standard Faust function.
Usage:
_ : smooth(tau2pole(tau)) : _
Where:
tau: desired smoothing time constant in seconds, or
hslider(...) : smooth(s) : _
Where:
s: smoothness between 0 and 1. s=0 for no smoothing, s=0.999 is "very smooth", s>1 is unstable, and s=1 yields the zero signal for all inputs. The exponential time-constant is approximately 1/(1-s) samples, when s is close to (but less than) 1.
Reference:
(si.)cbus
n parallel cables for complex signals.
cbus is a standard Faust function.
Usage
cbus(n)
cbus(4) : (r0,i0), (r1,i1), (r2,i2), (r3,i3)
Where:
n: is an integer known at compile time that indicates the number of parallel cables.- each complex number is represented by two real signals as (real,imag)
(si.)cmul
multiply two complex signals pointwise.
cmul is a standard Faust function.
Usage
(r1,i1) : cmul(r2,i2) : (_,_);
Where:
- Each complex number is represented by two real signals as (real,imag), so
(r1,i1)= real and imaginary parts of signal 1(r2,i2)= real and imaginary parts of signal 2
(si.)cconj
complex conjugation of a (complex) signal.
cconj is a standard Faust function.
Usage
(r1,i1) : cconj : (_,_);
Where:
- Each complex number is represented by two real signals as (real,imag), so
(r1,i1)= real and imaginary parts of the input signal(r1,-i1)= real and imaginary parts of the output signal
(si.)lag_ud
Lag filter with separate times for up and down.
Usage
_ : lag_ud(up, dn) : _;
(si.)rev
Reverse the input signal by blocks of N>0 samples. rev(1) is the indentity
function. rev(N) has a latency of N-1 samples.
Usage
_ : rev(N) : _;
Where:
N: the block size