DSP Blockset

Frequency and Magnitude Parameters: Yule-Walker IIR Filter Design.   For the Yule-Walker IIR Filter Design block, the Band edge frequency vector and Magnitudes at these frequencies parameters describe a piecewise linear magnitude response over the entire frequency range. The Band edge frequency vector contains points in the range 0 to 1, where 1 corresponds to half the sampling frequency. The Magnitudes at these frequencies vector contains the desired magnitude response at the points in the Band edge frequency vector. The two vectors must be the same length. The "transition regions" in this case are the linear segments connecting the defined frequency-magnitude pairs.

For example, the simple bandstop frequency response in the figure below can be specified by entering the following parameter values:

• Band edge frequency vector = [0 0.3 0.4 0.6 0.7 1], which specifies the desired frequency points.
• Magnitudes at these frequencies = [0 1 0 0 0.5 0.5], which defines the magnitudes corresponding to the frequencies above.

Together, the Band edge frequency vector and Magnitudes at these frequencies parameters shown define:

• A stopband, from 0.4 to 0.6
• A passband from 0.7 to 1
• Three transition regions: 0 to 0.3, 0.3 to 0.4, and 0.6 to 0.7

Frequency and Magnitude Parameter Overview

Frequency and Magnitude Parameters: Remez and Least Squares FIR Filter Design