Howtosignalprocessing
- What is warping effect in filter?
- What is the cause of frequency warping what is the cause of this effect?
- What is frequency warping in IIR filter?
- What is pre warping in filter design?
What is warping effect in filter?
Warping Effect:
The analog Frequency is same as the digital frequency response. At high frequencies, the relation between ω and Ω becomes Non-Linear. The Noise is introduced in the Digital Filter as in the Analog Filter. Amplitude and Phase responses are affected by this warping effect.
What is the cause of frequency warping what is the cause of this effect?
As "Tan inverse" is a non-linear function, it causes nonlinear compression of the frequency axis. This non-linear mapping which introduces a distortion in the frequency axis is called Frequency Warping.
What is frequency warping in IIR filter?
Frequency warping transformation is a process where one spectral representation on a certain frequency scale (e.g., Hz, f-domain) and with a certain frequency resolution (most often uniform) is transformed to another representation on a new frequency scale (e.g., Bark or ERB-rate scale, v-domain).
What is pre warping in filter design?
Prewarping. Frequency warping follows a known pattern, and there is a known relationship between the warped frequency and the known frequency. We can use a technique called prewarping to account for the nonlinearity, and produce a more faithful mapping.
