Howtosignalprocessing
- How do you calculate the group delay of a FIR filter?
- How do you compensate filter delay?
- What are the coefficients of an FIR filter?
- How does Matlab calculate group delay?
How do you calculate the group delay of a FIR filter?
Use the grpdelay function to compute group delay of a filter. For example, verify that, for a linear-phase FIR filter, the group delay is one-half the filter order. The phase delay of a filter is defined as the negative of the phase divided by the frequency: τ p ( ω ) = - θ ( ω ) ω .
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.
What are the coefficients of an FIR filter?
The term h[k] is the impulse response of the FIR filter, it is also referred to as FIR coefficients. Each tap in an FIR filter is a multiply-accumulate (MAC) unit which contains a register, a multiplier, and an adder as shown in Figure 1.
How does Matlab calculate group delay?
The group delay is evaluated at 8192 points equally spaced around the upper half of the unit circle. [ gd , w ] = grpdelay( sysobj , n ) returns the group delay of the filter System object and the corresponding frequencies at n points equally spaced around the upper half of the unit circle.
