Bat Filter Z-DSP Cartridge
The Bat Filter is a collection of 8 Voltage Controlled Digital Filters (VCDF). Compared to their analog cousins, digital ﬁlters are precise and deep.
They can remove or pass selected harmonics smoothly or aggressively depending on how they're conﬁgured.
The result is special character that brings a whole new sonic dimension to the analog modular synthesizer.
The Bat Filter algorithms are based on the Chebyshev ﬁlter topology.
They're pumping at low frequencies, smooth and pleasant at mid range, and aggressive up top as the audio frequency gets closer to the DSP sampling rate. One of the biggest advantages of digital ﬁlter design is the ability to cascade ﬁlters with no gain loss or added circuit noise like with analog ﬁlters.
This results in ﬁlters with up to 8 poles, a slope of 48db!
That' equivalent to having four 12db analog ﬁlters in series, yet maintaining a clean, strong signal at the output.
The Bat Filter contains the following algorithms:
Program 1 - Dual Stereo 8-Pole Low Pass Filter
Program 2 - Dual 8-Pole Band Pass
Program 3 - 4-Pole High Pass / Low Pass in Series
Program 4 - 8-Pole High Pass / Band Pass in Series
Program 5 - 8-Pole Triple Band Reject (Notch Filters)
Program 6 - 8-Pole High Pass / Band Reject in Series
Program 7 - Stereo Resonator: A Unique, Dynamically Varied Structure of Filters
Program 8 - Stereo 8-Pole High Pass Filter with Stereo Spread Control