Signal Toolkit - lp2lp

Function File: [bt, at] = lp2lp (b, a, Wo)

Function File: [At, Bt, Ct, Dt] = lp2lp (A, B, C, D, Wo)

Transform an analog lowpass filter prototype to a lowpass filter with a different cutoff frequency.

Two calling forms are available:

Transfer function form

[bt, at] = lp2lp (b, a, Wo)

Given a lowpass filter with numerator coefficients b and denominator coefficients a, returns the transformed filter coefficients bt and at with cutoff frequency Wo (in rad/s).

State-space form

[At, Bt, Ct, Dt] = lp2lp (A, B, C, D, Wo)

Given a lowpass filter in state-space form (A, B, C, D), returns the transformed state-space matrices (At, Bt, Ct, Dt) with cutoff frequency Wo (in rad/s).

See also: lp2hp, lp2bp, lp2bs.