A feedback adaptive noise cancellation (ANC) controller and a method having a feedback response partially provided by a fixed response filter

摘要

The controller for the adaptive noise canceling (ANC) system simplifies the design of the stable control response by being independent of the secondary path that extends the ANC gain of the system from the transducer of the ANC system to the sensor of the ANC system that measures the ambient noise. The controller includes a fixed filter having a predetermined fixed response and a variable filter coupled together. The variable response filter compensates for variations in the transfer function of the secondary path including at least the path from the transducer of the ANC system to the sensor of the ANC system so that the ANC gain is independent of the variations of the transfer function of the secondary path.