4D reverberator-based digital filters

This research presents a circuit realization for four-dimension (4D) reverberator-based two-input, two-output allpass structured discrete filters. The proposed 4D circuit realization requires, for its implementation, a minimum number of delay elements. As a result, the dimension of the state-vector, of the derived 4D state space model, is minimal and its 4D transfer function is characterized by the all-pass property. A low-order thorough example is provided to demonstrate the asserted minimality in both the circuit, and state-space realizations.