the Active Crossover Designer for ecasound/LADSPA (ACD-L) - diyAudio
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Old 7th October 2015, 05:54 PM   #1
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Join Date: Mar 2007
Location: California
Default the Active Crossover Designer for ecasound/LADSPA (ACD-L)


I have started to roll out the new version of the Active Crossover Designer. In this new version, ACD-L, filters functions are implemented using the LADSPA plugin code that I recently released, ACDf and mTAP. These, in combination with a LADSPA host audio processing program like ecasound, can be used to implement the DSP crossover in software, typically on a linux based operating system. The version of ACD for the miniDSP is still available as a separate download, but has not been updates with the new features of ACD-L at this time.

DSP crossovers using ecasound and LADSPA can be implemented on inexpensive computing hardware such as the Raspberry Pi. This opens up new possibilities for low-cost embedded DSP (e.g. DSP on-board the loudspeaker).

In addition to the switch to software based DSP, ACD-L includes new capabilities that allow multi-axis modeling of the loudspeaker response. This means that the user can see both the on- and off-axis responses while designing the crossover. Additionally, in order to visualize the multi-axis responses, a new extension will be released soon that offers several ways to plot the response data, including the standard line plot as well as a polar plot, both implemented in the tools natively. For additional plotting flexibility, data is processed into the matrix format used by GNUplot. This data can then be exported and plotted using that program as a heatmap or in a rectangular or polar heatmap or sonogram. This will be available soon.

This thread can also be used to post questions and get answers and for general ACD-L troubleshooting, setting up the ecasound and LADPSA software, implementing plugins, and other related questions. I will monitor the thread and post answers and tips here.

I will also update this thread when new components become available.

To download ACD-L templates, tutorial, and technical manual please visit the ACD link in my software listings, at:
Charlie's Audio Pages: software

"Hardware eventually fails. Software eventually works" - Michael Hartung
ACD LADSPA plugins - implements IIR digital crossover filters under Linux (e.g. on a Raspberry Pi, miniPC, etc.)
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