Math - Comparators
All of these constructs compare incoming voltage against either constant CV, or else against another voltage source, and output either high (10V) or low (0V) depending on the relationship between the two.
One possible use for these is to convert analog signals into binary values (0 = False, 10 = True) so that logical operations (NOT, AND, OR) can be performed elsewhere (logic constructs still to come).
All the comparators use the same basic technique. A MIX sums together A + inverse B + 5 V. If A is >= B, then the result will be >= 5V. If A < B the result will be < 5V. That result is then used as CV for a VCA to attenuate a 1V input. The result will be >= 0.5 only if A >= B. That then passes through OCT to round the value to either 1 if A>=B, or 0 if A<B. Finally the result is amplified by a factor of 10 by VCA MIX to get the final output of 0V or 10V.
Many of my constructs elsewhere in this topic rely on some variation of this technique.
Comparator
Outputs 10V if A >= B. B can be constant CV, or another input signal.
VCV Fundamental Comparator 16.vcvs (16.8 KB)
Polyphonic Comparator
Outputs 10V if A >= B, with support for polyphonic inputs for both A and B.
VCV Fundamental Polyphonic Comparator.vcvs (12.3 KB)
Comparator x 16
16 Comparators that output 10V if A >= B. There are 16 inputs for A, and B is either a universal constant CV, or a monophonic input that is replicated for each of the comparators.
Window Comparator
Four outputs available that compare A against B, with a Window range to test if A equals B. Both B and the Window can be constant CV, or an input signal.
- 10V if A >= B
- 10V if A<B
- 10V if A=B within a Window tolerance (|A-B| <= Window)
- 10V if A <> B within a Window tolerance (|A-B| > Window)
VCV Fundamental Window Comparator.vcvs (15.9 KB)
Polyphonic Window Comparator
A polyphonic version of the Window Comparator. Both A and B are polyphonic inputs. The Window is either universal constant CV, or else a monophonic input that is replicated for each of the comparators.
The output is polyphonic.
VCV Fundamental Polyphonic Window Comparator.vcvs (29.8 KB)
Schmitt Trigger Comparator
A comparator with memory and two thresholds that is resistant to noise on the inputs. See the documentation in the Notes for a full description.
VCV Fundamental Schmitt Trigger.vcvs (11.9 KB)