Howtosignalprocessing
- What is number of taps of a filter?
- What is fixed point FIR filter?
- How does the number of taps affect the frequency response of your FIR filters?
What is number of taps of a filter?
The number of FIR taps, (often designated as “N”) is an indication of 1) the amount of memory required to implement the filter, 2) the number of calculations required, and 3) the amount of “filtering” the filter can do; in effect, more taps means more stopband attenuation, less ripple, narrower filters, etc.
What is fixed point FIR filter?
A fixed-point filter uses fixed-point arithmetic and is represented by an equation with fixed-point coefficients. If the accumulator and output of the FIR filter do not have sufficient bits to represent their data, overflow occurs and distorts the signal.
How does the number of taps affect the frequency response of your FIR filters?
An FIR's tap is simply a coefficient value and the impulse response of an FIR filter is the filter's coefficients. The number of taps (N) is the amount of the memory needed to implement the filter. More taps mean higher frequency resolution, which in turn means narrower filters and/or steeper roll‐offs.
