The trail soon became even more inclined and, although the faded orange Adirondack Mountain Club trail markers directed hikers to the right, an inviting secondary path led to a spectacular view of Hurricane Mountain and surrounding lesser peaks.
In this approach, a sudden change in the secondary path during operation makes the algorithm reactivate injection of the white noise to re-adjust the secondary path estimate.
In delayless ANC applications with a secondary path S z), the adaptive filter input vector x(m) is first filtered by an estimate of the secondary path.
A practical ANC system should be robust to secondary path effects.
In existing literature, the secondary path used in a HANC system is estimated offline.
In addition, the proposed ANC system is robust against sudden changes of the secondary path model.
This paper focuses on the experimental and theoretical study of secondary path variations in AEMs.
In a real time environment, the secondary path is time varying in nature.
Analysis shows that the estimation error of secondary path transfer function introduces this undesired phenomenon.
Figure 7 (a) and (b) Primary path, (c) and (d) Secondary path.
The realization of the secondary path is usually obtained using a system identification technique.
