Which of the following schemes of system realization uses separate delay for input and output samples?

Which of the following schemes of system realization uses separate delay for input and output samples? Correct Answer Direct form I

Concept:

Direct form I realization:

• It is the direct implementation of differential equation or transfer function describing the system.
• It uses separate integrators for input and output variables.
• It provides direct relation between time domain and s-domain equations.
• In general, this form requires 2N delay elements (for both input and output signals) for a filter of order N. This form is practical for small filters.

Observation:

It uses separate integrators for input and output variables which indicated separate delay for input and output samples.