FIR filters direct form / transposed FIR

1. What is a direct form FIR filter?
2. How do I combine two FIR filters?
3. What is 2D FIR filter?

What is a direct form FIR filter?

FIR Direct Form. This is called “direct form” because it is a direct implementation of the convolution operation. The number of delays is equal to the order of the filter, hence this structure is canonic. It should be clear that. y[n] = h[0]x[n] + h[1]x[n - 1] + ··· + h[N]x[n - N] =

How do I combine two FIR filters?

Adding the Outputs of two FIR Filters

An informative experiment is the following: Filter the signal with low-pass filter. Then filter the original signal with a special high-pass filter having the same cutoff frequency (called a complementary filter). Now when you add up the two results, you get original signal back!

What is 2D FIR filter?

The 2D FIR Filter IP core performs real-time 2D convolution of windowed portions of incoming video frames with coefficient matrices held in internal memory. Its flexible architecture supports a wide variety of filtering operations on various Lattice device families.