Howtosignalprocessing
- How are FIR filters implemented?
- Is FIR a linear filter?
- Why is implementing a parallel FIR filter necessary?
How are FIR filters implemented?
An FIR filter can be easily implemented using just three digital hardware elements, a unit delay (a latch), a multiplier, and an adder. The unit delay simply updates its output once per sample period, using the value of the input as its new output value. In the convolution sum, .
Is FIR a linear filter?
FIR filters are usually designed to be linear-phase (but they don't have to be.) A FIR filter is linear-phase if (and only if) its coefficients are symmetrical around the center coefficient, that is, the first coefficient is the same as the last; the second is the same as the next-to-last, etc.
Why is implementing a parallel FIR filter necessary?
Parallel processing is a powerful technique because it can be used to increase the throughput of a FIR filter or reduce the power consumption of a FIR filter. However, a traditional block filter implementation causes a linear increase in the hardware cost (area) by a factor of L, the block size.
