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This version (15 Nov 2012 17:41) was approved by BillJ.The Previously approved version (15 Nov 2012 17:36) is available.Diff

State Variable

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The State-Variable block allows for simultaneous access to three different filter types: lowpass, highpass, and bandpass. See State Variable Algorithms for information about the parameters and calculations for this algorithm.

Set the center frequency in the Freq (Hz) field or by dragging the arrows. For examples and details, see Filters Example.

To have external control over Q from the block, refer to the State-Variable (Q input) Filter.

The three output pins let you choose among LP, HP, BP filters. The nature of this algorithm is to compute the coefficients for all filter types, giving you access to all of the filters simultaneously. If your application doesn't require use of all filter types, you can connect the output to a terminal block.