Lowpass
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SignalLab VC++ v.5.0.3
SignalLab VC++ is a set of Visual C++ components for fast Digital Signal Processing (DSP) and data visualization. Allows fast complex signal manipulations with zero lines of program code. Free for non-commercial use.
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Flex FX
Flex FX contains 7 different vst plugins, the Amplitude Modulator, Chaotic Lowpass Filter, Chaotic Highpass Filter, Ensemble effect, Stereo Feedback Delay, Ultra Feedback Flanger and Fat Resonator.
SignalLab .NET v.6.0
.NET 2.0-4.5 components for fast Digital Signal Processing (DSP) and data visualization. Allows fast complex signal manipulations with zero lines of program code. Includes a visual graphical editor for codeless design. Free for non-commercial use.
Diplexer v.2 9
This program is for designing diplexers of both the highpass/lowpass and bandpass/bandstop types.
SVCFilterDesign v.2 11
SVCfilter™ is a program designed to expedite the design and analysis of lowpass (and highpass) filters with nearest 5% Standard-Value Components.
OptLowpass v.2 3
OptLowpass™ is a specialized program written to expedite the design of transmitter output lowpass filters, especially for the HF amateur radio bands.
Stereo Tool v.6 10
Stereo Tool is a Winamp plugin that can be used to manipulate sounds. It contains a singleband compressor, an 8-band multiband compressor, a lowpass filter and a stereo image manipulator.
ActiveLowpass v.2.0
Download the active lowpass filter designer. This program uses the Salen-Key scheme; it offers analysis in addition to design and tuning of the various components. This program is free to use.
BITXlowpass v.2.0
Download a program which can be used to quickly design the RF lowpass filter used in the BITX (or other transceivers that have 50-ohm filters).
Flex FX Mac v.2.0.2
The Flex FX AU plugin package contains 6 different effect plugins, the Amplitude Modulator, the Chaotic Lowpass Filter, the Chaotic Highpass Filter, the Ensemble effect, the Stereo Feedback Delay and the Fat Resonator.
TigerDelay v.1.2.1
The Signal is filtered with a flexible and resonant 24dB lowpass filter, then delayed and fed back.