Compensate delay of non-symmetric (non-linear phase) filter

1. How do you compensate filter delay?
2. How do you calculate filter delay?
3. Why do filters cause delay?
4. What is delay of linear phase FIR filter?

How do you compensate filter delay?

When the shift is constant, you can correct for the delay by shifting the signal in time. Sometimes the filter delays some frequency components more than others. This phenomenon is called phase distortion. To compensate for this effect, you can perform zero-phase filtering using the filtfilt function.

How do you calculate filter delay?

The phase delay of a filter is defined as the negative of the phase divided by the frequency: τ p ( ω ) = - θ ( ω ) ω . Use the phasedelay function to compute the phase delay of a filter.

Why do filters cause delay?

Filters, however, also induce changes in the phases of different frequencies whose amplitude is unmodulated. These phase shifts cause time lags in the filtered signals, leading to a disruption of the timing information between different frequencies within the same signal and between different signals.

What is delay of linear phase FIR filter?

2.1. 4 What is the delay of a linear-phase FIR? The formula is simple: given a FIR filter which has N taps, the delay is: (N – 1) / (2 * Fs), where Fs is the sampling frequency. So, for example, a 21 tap linear-phase FIR filter operating at a 1 kHz rate has delay: (21 – 1) / (2 * 1 kHz)=10 milliseconds.