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Digital Filter

Discrete

The DigitalFilter block is a highly advanced signal processing tool designed to filter discrete-time signals during a simulation. It supports various traditional Infinite Impulse Response (IIR) filter approximations (Butterworth, Chebyshev I, Bessel) in cascading biquad structures, as well as Finite Impulse Response (FIR) Moving Average filters.

It calculates coefficients dynamically based on the current sample frequency (derived from the solver's fixed step size) to ensure mathematically accurate filtering in real-time.

Mathematical Model

y[n] = \frac{1}{a_0} \left( \sum_{i=0}^{N} b_i u[n-i] - \sum_{j=1}^{M} a_j y[n-j] \right)

Inputs & Outputs

Direction	ID	Label	Type	Status
→ In	`in`	In	number	Required
← Out	`out`	Out	number	Output

Parameters

Parameters	Label	Type	Default
`designMethod`	Design Method	select	`Butterworth`
`filterType`	Filter Type	select	`Lowpass`
`cutoffFreq`	Cutoff Freq (Hz)	number	`10`
`bandwidth`	Bandwidth (Hz)	number	`2`
`order`	Filter Order	select	`2`
`ripple`	Ripple (dB)	number	`1`
`windowSize`	Window Size	number	`10`

Usage Examples

Zie de ingebouwde voorbeelden in de handleiding voor een demonstratie van dit blok.

Remarks & Best Practices

Configuratie: Configureer dit blok via de parameters in het paneel.

Related Components

Constant: Eenvoudige signaalbron