gates_and_triggers.md

Gates and Triggers (G&T)

This program is inspired by the After Later Audio G&T module. The program converts a gate or trigger signal on din into a gate signal with a variable length and rising/falling edge triggers.

I/O Mapping

I/O	Usage
din	Incoming gate or trigger signal
ain	CV control over output gate length
b1	Manual input equivalent to din
b2	Manual toggle input
k1	Primary gate duration control
k2	Attenuverter for CV input on ain
cv1	Gate output for din/b1
cv2	Trigger output for the rising edge of din/b1
cv3	Trigger output for the falling edge of din/b1
cv4	Trigger output for the falling edge of cv1
cv5	Toggle output; changes state on every incoming rising edge
cv6	Trigger output for the falling edge of cv5

The gate output on cv1 has a normal range of 10ms to 2s, depending on the position of k1. CV input to ain can increase this duration.

ain expects an input range of 0-10V. k2 acts as an attenuverter for this input signal.

Timing Diagram

The following diagram shows the input and output states of the module. The height of the input to din or b1 is irrelevant, as long as it is enough to trigger the rising-edge interrupt service handler on the module (approx. 0.8V minimum).

DIN or B1
         __________          __________
________|          |________|          |______________

B2
                                                   __
__________________________________________________|  |
        .          .        .          .          .
        .          .        .          .          .
CV1     .          .        .          .          .
        .______    .        .__________________   .
________|      |____________|          .       |______
        .  L1  .   .        .       L2 .       .  .
        .      .   .        .          .       .  .
CV2     .      .   .        .          .       .  .
        ._     .   .        ._         .       .  .
________| |_________________| |_______________________
        .      .   .        .          .       .  .
        .      .   .        .          .       .  .
CV3     .      .   .        .          .       .  .
        .      .   ._       .          ._      .  .
___________________| |_________________| |___________
        .      .            .                  .  .
CV4     .      .            .                  .  .
        .      ._           .                  ._ .
_______________| |_____________________________| |___
        .                   .                     .
CV5     .                   .                     .
        .___________________.                     .__
________|                   |_____________________|
                            .
CV6                         .
                            ._
____________________________| |_______________________

We assume that between the first and second pulses, the combined CV input via k1, k2, and ain has changed, resulting in different gate lengths (L1 and L2, above)