Spread the love

I put these two in one topic/post as they would really only be used together.
The Impulse module generates a fixed duration impulse one sample long when the input (Trigger) voltage rises above zero volts.

Impulse generator module

Plugs.
Left Hand Side:
-> Trigger:- (Voltage) Creates the impulse voltage when the input rises above zero volts.

Right Hand Side:
<- Impulse Out:- (Voltage) Impulse output voltage.

Displays how the module being tested responds to very short audio pulses.

Impulse response module

Plugs:
Left Hand Side:
-> Impulse In:- (Voltage) Triggers the display “trace”. This must be connected to the impulse to work.
-> Signal In:- (Voltage) The signal to be displayed on screen.
-> Mode:- (List) Select from two modes: Impulse response and frequency response

These modules are useful for testing the response of filters to very short impulses when used with the impulse response module as shown below.

Using the Impulse module with a Moog filter and the response module.
This screenshot shows the impulse response of the Moog filter at maximum frequency, and minimum resonance:

Moog filter impulse response


Compare this screenshot showing the impulse response of the SV filter at maximum frequency, and minimum resonance:

SV Filter Impulse response

Its clear to see that this filter is “ringing” quite a bit, normal for a Moog or SV filter at maximum resonance, but if this was a shelf filter, or a filter for an equalizer this would represent a severe problem with the filter.
You can see from this how useful these two modules can be for pinning down audio problems with filters or delay line response to impulses. Indispensable for SEM programmers, and also for Plugin designers if a filter seems to be “misbehaving”.
This module will show up issues with ringing or smearing of very short pulses, and any issues with latency.