Mention the advantages of direct-form-ii structures?

(ii) The Direct Form-II structure has the advantage over the Direct Form I as it requires less memory storage for the data samples. These types of filters are an all-pole filter followed by an all-zero (forward) filter. The issue is the high gain of the all-pole section.

1. What is the advantage of the direct form II?
2. What is direct form II?
3. What are the direct form structures?
4. What is the reason for direct form II is called as canonical structure?

What is the advantage of the direct form II?

The advantage of the direct form-II realization of continuous-time systems is that it uses minimum number of integrators. In this realization structure, an intermediate variable is integrated, instead of using the separate integrators for integrating the input and output variables separately.

What is direct form II?

In general, a direct form realization refers to a structure where the coefficients of the transfer function appear directly as Gain blocks. The direct form II realization method is presented as using the minimal number of delay elements, which is equal to n, the order of the transfer function denominator.

What are the direct form structures?

The IIR Direct Form structures usually require few mathematical operations. However, the sensitivity to finite word length effects limits the use of this form in fixed-point implementations. Use the IIR Cascaded Second-Order Sections Form structures to alleviate finite word length effects.

What is the reason for direct form II is called as canonical structure?

In summary, the DF-II structure has the following properties: It can be regarded as a two-pole filter section followed by a two-zero filter section. It is canonical with respect to delay. This happens because delay elements associated with the two-pole and two-zero sections are shared.